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1. High-resolution search for the $\Theta^{+}$ pentaquark via a pion-induced reaction at J-PARC

Author

Collaboration, J-PARC E19, Moritsu, M., Adachi, S., Agnello, M., Ajimura, S., Aoki, K., Bhang, H. C., Bassalleck, B., Botta, E., Bufalino, S., Chiga, N., Ekawa, H., Evtoukhovitch, P., Feliciello, A., Fujioka, H., Hayakawa, S., Hiruma, F., Honda, R., Hosomi, K., Ichikawa, Y., Ieiri, M., Igarashi, Y., Imai, K., Ishibashi, N., Ishimoto, S., Itahashi, K., Iwasaki, R., Joo, C. W., Kanatsuki, S., Kim, M. J., Kim, S. J., Kiuchi, R., Koike, T., Komatsu, Y., Kulikov, V. V., Marcello, S., Masumoto, S., Matsumoto, Y., Matsuoka, K., Miwa, K., Nagae, T., Naruki, M., Niiyama, M., Noumi, H., Nozawa, Y., Ota, R., Ozawa, K., Saito, N., Sakaguchi, A., Sako, H., Samoilov, V., Sato, M., Sato, S., Sato, Y., Sawada, S., Sekimoto, M., Shirotori, K., Sugimura, H., Suzuki, S., Takahashi, H., Takahashi, T., Takahashi, T. N., Tamura, H., Tanaka, T., Tanida, K., Tokiyasu, A. O., Tomida, N., Tsamalaidze, Z., Ukai, M., Yagi, K., Yamamoto, T. O., Yang, S. B., Yonemoto, Y., Yoon, C. J., and Yoshida, K.

Subjects
Nuclear Experiment, High Energy Physics - Experiment, Nuclear Theory
Abstract

The pentaquark $\Theta^+$ has been searched for via the $\pi^-p \to K^-X$ reaction with beam momenta of 1.92 and 2.01 GeV/$c$ at J-PARC. A missing mass resolution of 2 MeV (FWHM) was achieved but no sharp peak structure was observed. The upper limits on the production cross section averaged over the scattering angle from 2$^{\circ}$ to 15$^{\circ}$ in the laboratory frame were found to be less than 0.28 $\mu$b/sr at the 90\% confidence level for both the 1.92- and 2.01-GeV/$c$ data. The systematic uncertainty of the upper limits was controlled within 10\%. Constraints on the $\Theta^+$ decay width were also evaluated with a theoretical calculation using effective Lagrangian. The present result implies that the width should be less than 0.36 and 1.9 MeV for the spin-parity of $1/2^+$ and $1/2^-$, respectively., Comment: 12 pages, 9 figures; published version

Published
2014
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2. Near threshold angular distributions of the $^2$H$(\gamma,\Lambda)$X reaction

Author

Beckford, B., Bydzovsky, P., Chiba, A., Doi, D., Fujii, T., Fujii, Y., Futatsukawa, K., Gogami, T., Hashimoto, O., Han, Y. C., Hirose, K., Honda, R., Hosomi, K., Ishikawa, T., Kanda, H., Kaneta, M., Kaneko, Y., Kato, S., Kawama, D., Kimura, C., Kiyokawa, S., Koike, T., Maeda, K., Makabe, K., Matsubara, M., Miwa, K., Nagao, S., Nakamura, S. N., Okuyama, A., Shirotori, K., Sugihara, K., Suzuki, K., Tamae, T., Tamura, H., Tsukada, K., Yamamoto, F., Yamamoto, T. O., Yonemoto, Y., and Yamazaki, H.

Subjects
Nuclear Experiment
Abstract

A study of the $^2$H$({\gamma},{\Lambda})$X reaction was performed using a tagged photon beam at the Research Center for Electron Photon Science (ELPH), Tohoku University. The photoproduced $\Lambda$ was measured in the $p{\pi^{-}}$ decay channel by the upgraded Neutral Kaon Spectrometer (NKS2+). The momentum integrated differential cross section was determined as a function of the scatting angle of ${\Lambda}$ in the laboratory frame for five energy bins. Our results indicated a peak in the cross section at angles smaller than cos$\theta^{LAB}_{\Lambda}$ = $0.96$. The experimentally obtained angular distributions were compared to isobar models, Kaon-Maid (KM) and Saclay-Lyon A (SLA), in addition to the composite Regge-plus-resonance (RPR) model. Both SLA(r$K_{1}K_{\gamma}$ = $-1.4$) and RPR describe the data quite well in contrast to the KM model, which substantially under predicted the cross section at the most forward angles. With the anticipated finalized data on ${\Lambda}$ integrated and momentum dependent differential cross sections of $^2$H$({\gamma},{\Lambda})$X~\cite{Kaneta_Beckford}, we present our findings on the angular distributions in this report.

Published
2013

3. Measurements of the photon induced production of $\Lambda$ in the $^2$H$({\gamma},{\Lambda})$X process at threshold energies

Author

Beckford, B., Bydzovsky, P., Chiba, A., Doi, D., Fujii, T., Fujii, Y., Futatsukawa, K., Gogami, T., Hashimoto, O., Han, Y. C., Hirose, K., Hirose, S., Honda, R., Hosomi, K., Ishikawa, T., Kanda, H., Kaneta, M., Kaneko, Y., Kato, S., Kawama, D., Kimura, C., Kiyokawa, S., Koike, T., Maeda, K., Makabe, K., Matsubara, M., Miwa, K., Nagao, S., Nakamura, S. N., Okuyama, A., Shirotori, K., Sugihara, K., Suzuki, K., Tamae, T., Tamura, H., Tsukada, K., Yagi, K., Yamamoto, F., Yamamoto, T. O., Yamazaki, H., and Yonemoto, Y.

Subjects
Nuclear Experiment
Abstract

An experiment was carried out with the NKS2+ in 2010 at the Research Center for Electron Photon Science (ELPH), in which tagged photon beams in the range of 0.8 $\le$ $E_{\gamma}$ $\le$ 1.1 GeV were impinged on a liquid $^2$H target positioned at the center of the NKS2+. The produced $\Lambda$ was subsequently detected by the $p{\pi^{-}}$ decay channel. Integrated cross sections of the $^2$H$({\gamma},{\Lambda})$X in the angular region of 0.9 $\le$ $\cos{\theta}_{\Lambda}^{LAB}$ $\le$ 1.0 was derived and compared with preceding experimental results of the NKS2 collaboration. In addition, the momentum spectra for two photon energy regions were also procured. The ${\Lambda}$ angle dependent cross sections as a function of the scattering angle in the laboratory system was additionally deduced. We present the latest results on the excitation function of ${\Lambda}$ photoproduction, the momentum distributions, angular distributions, and polarization., Comment: 6 pages, 6 pages. Proceedings of the International Workshop on Strangeness Nuclear Physics (SNP12), August 27 - 29, 2012, Neyagawa, Osaka, Japan

Published
2012

4. Search for the $\Theta^{+}$ pentaquark via the $\pi^-p\to K^-X$ reaction at 1.92 GeV/$c$

Author

Shirotori, K., Takahashi, T. N., Adachi, S., Agnello, M., Ajimura, S., Aoki, K., Bang, H. C., Bassalleck, B., Botta, E., Bufalino, S., Chiga, N., Evtoukhovitch, P., Feliciello, A., Fujioka, H., Hiruma, F., Honda, R., Hosomi, K., Ichikawa, Y., Ieiri, M., Igarashi, Y., Imai, K., Ishibashi, N., Ishimoto, S., Itahashi, K., Iwasaki, R., Joo, C. W., Kim, M. J., Kim, S. J., Kiuchi, R., Koike, T., Komatsu, Y., Kulikov, V. V., Marcello, S., Masumoto, S., Matsuoka, K., Miwa, K., Moritsu, M., Nagae, T., Naruki, M., Niiyama, M., Noumi, H., Ozawa, K., Saito, N., Sakaguchi, A., Sako, H., Samoilov, V., Sato, M., Sato, S., Sato, Y., Sawada, S., Sekimoto, M., Sugimura, H., Suzuki, S., Takahashi, H., Takahashi, T., Tamura, H., Tanaka, T., Tanida, K., Tokiyasu, A. O., Tomida, N., Tsamalaidze, Z., Ukai, M., Yagi, K., Yamamoto, T. O., Yang, S. B., Yonemoto, Y., Yoon, C. J., and Yoshida, K.

Subjects
Nuclear Experiment
Abstract

The $\Theta^+$ pentaquark baryon was searched for via the $\pi^-p\to K^-X$ reaction in a missing-mass resolution of 1.4 MeV/$c^2$(FWHM) at J-PARC. $\pi^-$ meson beams were incident on the liquid hydrogen target with the beam momentum of 1.92 GeV/$c$. No peak structure corresponding to the $\Theta^+$ mass was observed. The upper limit of the production cross section averaged over the scattering angle of 2$^{\circ}$ to 15$^{\circ}$ in the laboratory frame was obtained to be 0.26 $\mu$b/sr in the mass region of 1.51$-$1.55 GeV/$c^2$.The upper limit of the $\Theta^+$ decay width using the effective Lagrangian approach was obtained to be 0.72 MeV/$c^2$ and 3.1 MeV/$c^2$ for $J^P_{\Theta}=1/2^+$ and $J^P_{\Theta}=1/2^-$, respectively., Comment: 5 pages, 3 figures, 1 table

Published
2012
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5. Report on strangeness photoproduction experiments performed with the Neutral Kaon Spectrometer 2

Author

Beckford, B., Chiba, A., Doi, D., Fujibayashi, J., Fujii, T., Fujii, Y., Futatsukawa, K., Gogami, T., Hashimoto, O., Han, Y. C., Hirose, K., Hirose, S., Honda, R., Hosomi, K., Iguchi, A., Ishikawa, T., Kanda, H., Kaneta, M., Kaneko, Y., Kato, S., Kawama, D., Kawasaki, T., Kimura, C., Kiyokawa, S., Koike, T., Maeda, K., Makabe, K., Maruyama, N., Matsubara, M., Miwa, K., Miyagi, Y., Nagao, S., Nakamura, S. N., Okuyama, A., Shirotori, K., Sugihara, K., Suzuki, K., Tamae, T., Tamura, H., Terada, N., Tsukada, K., Yagi, K., Yamamoto, F., Yamamoto, T. O., Yamazaki, H., and Yonemoto, Y.

Subjects
Nuclear Experiment
Abstract

An experiment designed to investigate the strangeness photoproduction process using a tagged photon beam in the energy range of 0.90 -1.08 GeV incident on a liquid deuterium target was successfully performed. The purpose of the experiment was to measure the production of neutral kaons and the lambda particles on a deuteron. The generation of photo produced particles was verified by the measurement of their decayed charged particles in the Neutral Kaon Spectrometer 2. The reconstructed invariant mass distributions were achieved by selecting events where two or more particles tracks were identified. Preliminary results are presented here., Comment: Originally submitted to the Research Center for Electron Photon Science (ELPH) Annual Report, Tohoku University Vol. 2 (2011) (ELPH Experiment : #2633, #2638, #2658)

Published
2012

6. Search for the [formula omitted] pentaquark at J-PARC

Author

Moritsu, M., Adachi, S., Agnello, M., Ajimura, S., Aoki, K., Bhang, H.C., Bassalleck, B., Botta, E., Bufalino, S., Chiga, N., Ekawa, H., Evtoukhovitch, P., Feliciello, A., Fujioka, H., Hayakawa, S., Hiruma, F., Honda, R., Hosomi, K., Ichikawa, Y., Ieiri, M., Igarashi, Y., Imai, K., Ishibashi, N., Ishimoto, S., Itahashi, K., Iwasaki, R., Joo, C.W., Kanatsuki, S., Kim, M.J., Kim, S.J., Kiuchi, R., Koike, T., Komatsu, Y., Kulikov, V.V., Marcello, S., Masumoto, S., Matsumoto, Y., Matsuoka, K., Miwa, K., Nagae, T., Naruki, M., Niiyama, M., Noumi, H., Nozawa, Y., Ota, R., Ozawa, K., Saito, N., Sakaguchi, A., Sako, H., Samoilov, V., Sato, M., Sato, S., Sato, Y., Sawada, S., Sekimoto, M., Shirotori, K., Sugimura, H., Suzuki, S., Takahashi, H., Takahashi, T., Takahashi, T.N., Tamura, H., Tanaka, T., Tanida, K., Tokiyasu, A.O., Tomida, N., Tsamalaidze, Z., Ukai, M., Yagi, K., Yamamoto, T.O., Yang, S.B., Yonemoto, Y., Yoon, C.J., and Yoshida, K.

Published
2013
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9. Axillary lymph-node metabolic activity assessment on 18F-FDG-PET/CT in rheumatoid arthritis patients treated with biologic therapies.

Author

Dam, TT, Okamura, K, Nakajima, T, Yonemoto, Y, Suto, T, Arisaka, Y, Tomonaga, H, Tachibana, M, Tajika, T, Vu, LD, Chikuda, H, Tsushima, Y, Dam, T T, and Vu, L D

Subjects
WRIST, GLUCOSE metabolism, POSITRON emission tomography computed tomography, BIOMARKERS, ARM, AXILLA, CELL receptors, LYMPH nodes, TUMOR necrosis factors, RADIOPHARMACEUTICALS, RHEUMATOID arthritis, DEOXY sugars, CHEMICAL inhibitors
Abstract

Objective: Recent studies have provided new insights into the role of lymph nodes (LNs) in rheumatoid arthritis (RA). The aim of this study was to evaluate the metabolic activity of the axillary LNs in relation to that of the upper limb joints and the clinical assessment of disease activity in RA patients treated with biologic therapies.Method: 18F-fluorodeoxyglucose-positron emission tomography/computed tomography (18F-FDG-PET/CT) scans were acquired for 64 patients with RA at baseline and after 6 months of biologic therapy, and the patients' clinical status was evaluated. The maximum standardized uptake value (SUVmax), metabolic active volume, and total lesion glycolysis (TLG) were used to assess glucose metabolism in the LNs and 12 joints. Clinical evaluations included serum markers and the Disease Activity Score based on 28-joint count-erythrocyte sedimentation rate (DAS28-ESR).Results: Changes in the SUVmax and TLG for the axillary LNs correlated significantly with those of the ipsilateral wrist joints. There was a positive correlation between the changes in the three metabolic parameters of the axillary LNs and the changes in disease activity after treatment. After 6 months of biologic therapy, all metabolic parameters for the axillary LNs in patients with a DAS28-ESR < 3.2 were significantly lower than those of patients with a DAS28-ESR ≥ 3.2.Conclusion: A relationship between the glucose metabolism of the axillary LNs and the ipsilateral wrist joints was demonstrated by the 18F-FDG-PET/CT parameters. The metabolic activity and active volume of axillary LNs may reflect the therapeutic response to the biologic treatment of RA. [ABSTRACT FROM AUTHOR]

Published
2020
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13. High-resolution search for the $��^{+}$ pentaquark via a pion-induced reaction at J-PARC

Author

PARC E19 Collaboration, Moritsu, M., Adachi, S., Agnello, M., Ajimura, S., Aoki, K., Bhang, H. C., Bassalleck, B., Botta, E., Bufalino, S., Chiga, N., Ekawa, H., Evtoukhovitch, P., Feliciello, A., Fujioka, H., Hayakawa, S., Hiruma, F., Honda, R., Hosomi, K., Ichikawa, Y., Ieiri, M., Igarashi, Y., Imai, K., Ishibashi, N., Ishimoto, S., Itahashi, K., Iwasaki, R., Joo, C. W., Kanatsuki, S., Kim, M. J., Kim, S. J., Kiuchi, R., Koike, T., Komatsu, Y., Kulikov, V. V., Marcello, S., Masumoto, S., Matsumoto, Y., Matsuoka, K., Miwa, K., Nagae, T., Naruki, M., Niiyama, M., Noumi, H., Nozawa, Y., Ota, R., Ozawa, K., Saito, N., Sakaguchi, A., Sako, H., Samoilov, V., Sato, M., Sato, S., Sato, Y., Sawada, S., Sekimoto, M., Shirotori, K., Sugimura, H., Suzuki, S., Takahashi, H., Takahashi, T., Takahashi, T. N., Tamura, H., Tanaka, T., Tanida, K., Tokiyasu, A. O., Tomida, N., Tsamalaidze, Z., Ukai, M., Yagi, K., Yamamoto, T. O., Yang, S. B., Yonemoto, Y., Yoon, C. J., and Yoshida, K.

Subjects
Nuclear Theory (nucl-th), High Energy Physics - Experiment (hep-ex), FOS: Physical sciences, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

The pentaquark $��^+$ has been searched for via the $��^-p \to K^-X$ reaction with beam momenta of 1.92 and 2.01 GeV/$c$ at J-PARC. A missing mass resolution of 2 MeV (FWHM) was achieved but no sharp peak structure was observed. The upper limits on the production cross section averaged over the scattering angle from 2$^{\circ}$ to 15$^{\circ}$ in the laboratory frame were found to be less than 0.28 $��$b/sr at the 90\% confidence level for both the 1.92- and 2.01-GeV/$c$ data. The systematic uncertainty of the upper limits was controlled within 10\%. Constraints on the $��^+$ decay width were also evaluated with a theoretical calculation using effective Lagrangian. The present result implies that the width should be less than 0.36 and 1.9 MeV for the spin-parity of $1/2^+$ and $1/2^-$, respectively., 12 pages, 9 figures; published version

Published
2014
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18. THU0092 The Long-Lasting Benefits of Upper Extremity Surgery for Disabled Patients with Rheumatoid Arthritis

Author

Okura, C., primary, Ishikawa, H., additional, Abe, A., additional, Oyakawa, T., additional, Miyagawa, Y., additional, Otani, H., additional, Kobayashi, D., additional, Ito, S., additional, Nakazono, K., additional, Yonemoto, Y., additional, Okamura, K., additional, Suto, T., additional, Murasawa, A., additional, and Takagiishi, K., additional

Published
2015
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19. THU0191 Comparison of Golimumab 50 Mg/4 Weeks plus Methotrexate with Golimumab 100 Mg/4 Weeks Monotherapy in Patients with Rheumatoid Arthritis: Results from the Japanese GRN Multicenter Cohort Study

Author

Yonemoto, Y., primary, Okamura, K., additional, Sakurai, T., additional, Ayabe, K., additional, Takeuchi, K., additional, Kaneko, T., additional, Matsushita, M., additional, Iso, T., additional, Okura, C., additional, Inoue, H., additional, Otsuka, K., additional, and Takagishi, K., additional

Published
2014
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22. Search for the Θ+ pentaquark at J-PARC

Author

Moritsu, M., primary, Adachi, S., additional, Agnello, M., additional, Ajimura, S., additional, Aoki, K., additional, Bhang, H.C., additional, Bassalleck, B., additional, Botta, E., additional, Bufalino, S., additional, Chiga, N., additional, Ekawa, H., additional, Evtoukhovitch, P., additional, Feliciello, A., additional, Fujioka, H., additional, Hayakawa, S., additional, Hiruma, F., additional, Honda, R., additional, Hosomi, K., additional, Ichikawa, Y., additional, Ieiri, M., additional, Igarashi, Y., additional, Imai, K., additional, Ishibashi, N., additional, Ishimoto, S., additional, Itahashi, K., additional, Iwasaki, R., additional, Joo, C.W., additional, Kanatsuki, S., additional, Kim, M.J., additional, Kim, S.J., additional, Kiuchi, R., additional, Koike, T., additional, Komatsu, Y., additional, Kulikov, V.V., additional, Marcello, S., additional, Masumoto, S., additional, Matsumoto, Y., additional, Matsuoka, K., additional, Miwa, K., additional, Nagae, T., additional, Naruki, M., additional, Niiyama, M., additional, Noumi, H., additional, Nozawa, Y., additional, Ota, R., additional, Ozawa, K., additional, Saito, N., additional, Sakaguchi, A., additional, Sako, H., additional, Samoilov, V., additional, Sato, M., additional, Sato, S., additional, Sato, Y., additional, Sawada, S., additional, Sekimoto, M., additional, Shirotori, K., additional, Sugimura, H., additional, Suzuki, S., additional, Takahashi, H., additional, Takahashi, T., additional, Takahashi, T.N., additional, Tamura, H., additional, Tanaka, T., additional, Tanida, K., additional, Tokiyasu, A.O., additional, Tomida, N., additional, Tsamalaidze, Z., additional, Ukai, M., additional, Yagi, K., additional, Yamamoto, T.O., additional, Yang, S.B., additional, Yonemoto, Y., additional, Yoon, C.J., additional, and Yoshida, K., additional

Published
2013
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34. Search for Pentaquark Θ + in Hadronic Reaction at J-PARC

Author

Naruki, M., primary, Adachi, S., additional, Agnello, M., additional, Ajimura, S., additional, Aoki, K., additional, Bang, H., additional, Bassalleck, B., additional, Botta, E., additional, Bufalino, S., additional, Ekawa, H., additional, Evtoukhovitch, P., additional, Feliciello, A., additional, Fujioka, H., additional, Hayakawa, S., additional, Hiruma, F., additional, Honda, R., additional, Hosomi, K., additional, Ichikawa, Y., additional, Ieiri, M., additional, Igarashi, Y., additional, Imai, K., additional, Ishibashi, N., additional, Ishimoto, S., additional, Itahashi, K., additional, Iwasaki, R., additional, Joo, G. G., additional, Kanatsuki, S., additional, Kim, M. J., additional, Kim, S. J., additional, Kiuchi, R., additional, Koike, T., additional, Komatsu, Y., additional, Kulikov, V. V., additional, Marcello, S., additional, Masumoto, S., additional, Matsumoto, Y., additional, Matsuoka, K., additional, Miwa, K., additional, Moritsu, M., additional, Nagae, T., additional, Niiyama, M., additional, Noumi, H., additional, Nozawa, Y., additional, Ota, R., additional, Ozawa, K., additional, Saito, N., additional, Sakaguchi, A., additional, Sako, H., additional, Samoilov, V., additional, Sato, M., additional, Sato, S., additional, Sato, Y., additional, Sawada, S., additional, Sekimoto, M., additional, Shirotori, K., additional, Sugimura, H., additional, Suzuki, S., additional, Takahashi, T. N., additional, Takahashi, H., additional, Takahashi, T., additional, Tamura, H., additional, Tanaka, T., additional, Tanida, K., additional, Tokiyasu, A. O., additional, Tomida, N., additional, Tsamalaidze, Z., additional, Ukai, M., additional, Yagi, K., additional, Yamamoto, T. O., additional, Yang, S. B., additional, Yonemoto, Y., additional, Yoon, C. J., additional, and Yoshida, K., additional

Published
2013
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36. Search for theΘ+Pentaquark via theπ−p→K−XReaction at1.92GeV/c

Author

Shirotori, K., primary, Takahashi, T. N., additional, Adachi, S., additional, Agnello, M., additional, Ajimura, S., additional, Aoki, K., additional, Bhang, H. C., additional, Bassalleck, B., additional, Botta, E., additional, Bufalino, S., additional, Chiga, N., additional, Evtoukhovitch, P., additional, Feliciello, A., additional, Fujioka, H., additional, Hiruma, F., additional, Honda, R., additional, Hosomi, K., additional, Ichikawa, Y., additional, Ieiri, M., additional, Igarashi, Y., additional, Imai, K., additional, Ishibashi, N., additional, Ishimoto, S., additional, Itahashi, K., additional, Iwasaki, R., additional, Joo, C. W., additional, Kim, M. J., additional, Kim, S. J., additional, Kiuchi, R., additional, Koike, T., additional, Komatsu, Y., additional, Kulikov, V. V., additional, Marcello, S., additional, Masumoto, S., additional, Matsuoka, K., additional, Miwa, K., additional, Moritsu, M., additional, Nagae, T., additional, Naruki, M., additional, Niiyama, M., additional, Noumi, H., additional, Ozawa, K., additional, Saito, N., additional, Sakaguchi, A., additional, Sako, H., additional, Samoilov, V., additional, Sato, M., additional, Sato, S., additional, Sato, Y., additional, Sawada, S., additional, Sekimoto, M., additional, Sugimura, H., additional, Suzuki, S., additional, Takahashi, H., additional, Takahashi, T., additional, Tamura, H., additional, Tanaka, T., additional, Tanida, K., additional, Tokiyasu, A. O., additional, Tomida, N., additional, Tsamalaidze, Z., additional, Ukai, M., additional, Yagi, K., additional, Yamamoto, T. O., additional, Yang, S. B., additional, Yonemoto, Y., additional, Yoon, C. J., additional, and Yoshida, K., additional

Published
2012
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46. Changes in sugars and acids in pitaya (Hylocereus undatus) fruit during development.

Author

Nomura, K., Ide, M., and Yonemoto, Y.

Subjects
PITAHAYAS, POLLINATION, PLANT development, PLANT physiology, HORTICULTURE, PLANT growth, GLUCOSE, ACIDS
Abstract

Seasonal changes in skin colour, and sugar and acid contents were studied in pitaya (Hylocereus undatus Britt & Rose) fruits pollinated in July (Summer) and October (Autumn) on Ishigaki Island, Japan. Changes in skin colour pattern (a∗ and b∗ values), total soluble solids (TSS) and sugar contents exhibited a sigmoid pattern irrespective of the time of pollination, except for skin colour b∗ values in Autumn-pollinated fruit. In both groups, mature fruit had higher TSS contents in the centre of the fruit compared with other sections. Malic acid was the main acid in the fruit, with no clear seasonal pattern. Changes in glucose and fructose contents exhibited a similar pattern to that of TSS, but the values were higher in mature Autumn fruit than in mature Summer fruit, and differed among fruit sections. The differences tended to converge during late maturation when a∗ values and TSS contents reached a constant level. These results indicate that each a∗ value and TSS content could not be applied solely to a maturity index. By considering accumulated temperature (AT) from pollination (AT-growth) instead of days after pollination, changes in a∗ values and TSS contents were in good agreement, irrespective of pollination date. These values reached a plateau when fruit had received about 22,500°C AT-growth. In both series, the best harvesting time for white pitaya was when fruits had received approx, an additional 3,000°C AT after the a∗ value had reached a plateau. [ABSTRACT FROM AUTHOR]

Published
2005
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