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The crop leaf color is tightly connected with its meteorological environment. Color gradation skewness-distribution (CGSD) parameters can describe the information of leaf color more accurately, systematically, and comprehensively from five dimensions. We took photographs of pepper growing in the greenhouse at a fixed time every day and observed the meteorological factors. The results showed that the CGSD parameters were significantly correlated with meteorological factors, especially with the accumulated temperature, which showed the strongest correlation. Since the relationship between canopy leaf color and accumulated temperature is nonlinear, the piecewise inversion models were constructed by taking the stationary point of the high-order response model of Gskewness to accumulated temperature as the point of demarcation. The rate of outliers had decreased by 57.72%; moreover, the overall inversion accuracy had increased by 3.31% compared with the linear model directly constructed by the stepwise regression. It was observed that the pepper in the greenhouse had a different response to the same meteorological environmental stimulus before and after the stationary point. This study will provide a new method for constructing crop growth models in future research. [ABSTRACT FROM AUTHOR]

Plants contain several NADPH-producing enzymes including glucose-6-phosphate dehydrogenases (G6PDH) with different sub-cellular localizations. The activity of plastidial G6PDHs is redox-regulated by thioredoxins (TRX). Although specific TRXs are known to regulate chloroplastic isoforms of G6PDH, little information is available for plastidic isoforms found in heterotrophic organs or tissues. Here, we investigated TRX regulation of the two G6PDH plastidic isoforms of Arabidopsis roots during exposure to a mild salt stress. We report that in vitro m-type TRXs are the most efficient regulators of the G6PDH2 and G6PDH3 mainly found in Arabidopsis roots. While expression of the corresponding G6PD and plastidic TRX genes was marginally affected by salt, it impaired root growth of several of the corresponding mutant lines. Using an in situ assay for G6PDH, G6PDH2 was found to be the major contributor to salt-induced increases in activity, while data from ROS assays further provide in vivo evidence that TRX m acts in redox regulation during salt stress. Taken together, our data suggest that regulation of plastid G6PDH activity by TRX m may be an important player regulating NADPH production in Arabidopsis roots undergoing salt stress., Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2023 Née, Wang, Châtel-Innocenti, Mhamdi, Juranville, Vanacker, Noctor and Issakidis-Bourguet.)

Purpose: To investigate the application values of CT combined with tumor markers (TM) in the diagnosis and prognosis of hepatocellular carcinoma (HCC)., Methods: 62 HCC patients were selected as the study group and all of them had undergone hepatectomy. In addition, 40 healthy subjects composed the control group. Blood samples were collected preoperatively from the subjects of the study group, and serum alpha fetoprotein (AFP), carbohydrate antigen 19-9 (CA19-9) and carcinoembryonic antigen (CEA) levels were determined by radioimmunoassay. The correlation between serum TM levels and clinicopathological features was investigated by pathological examination. The imaging features of HCC were explored by spiral CT plain scanning and enhanced scanning. The diagnostic efficiency of single detection of TM, combined detection of TMs and combined detection of TMs and CT was analyzed by receiver operating characteristic (ROC)., Results: The levels of serum AFP, CA19-9 and CEA in HCC patients were significantly higher than those in the control group (p<0.05). Patients with low differentiation and distant metastasis had higher levels of AFP, CA19-9 and CEA (p<0.05) compared with patients with high differentiation and no distant metastasis. There were no significant differences in TM levels in HCC patients with different age, gender and clinical stages (p>0.05). The ROC analysis showed that the single detection of serum AFP, CEA or CA19-9 had lower specificity and sensitivity compared with the combined detection of the three TMs (p<0.05). The combined CT examination could achieve a specificity of 95.71% and a sensitivity of 87.47%, superior to the combined detection of the TMs (p<0.05). Eight HCC patients relapsed within 6 months after operation. Compared with those before operation, the levels of serum AFP, CA19-9 and CEA in the relapsed patients were increased significantly, and the TM levels were higher than those in patients without relapse (p<0.05)., Conclusions: The detection of serum AFP, CA19-9 and CEA combined with CT can overcome the deficiency of single detection, avoid misdiagnosis and missed diagnosis, and increase significantly the positive detection rate of HCC.

Purpose: To investigate multi-slice spiral CT (MSCT) imaging with breast cancer chemotherapy and the correlation between MSCT and breast cancer-specific gene 1 (BCSG1)., Methods: 86 patients with breast cancer were enrolled from January 2016 to May 2017. All of them were treated with neoadjuvant chemotherapy, and underwent MSCT scan before and after treatment to evaluate the efficacy of chemotherapy. The expression of BCSG1 in tumor tissue was detected by immunohistochemistry and the correlation between CT results and BCSG1 was analyzed., Results: MSCT evaluation of the efficacy of chemotherapy in breast cancer patients was consistent with pathological evaluation (p<0.05). MSCT in patients after chemotherapy was significantly better than before chemotherapy (p<0.05). CT examination showed that tumor diameter and lymph node size were significantly reduced after chemotherapy (p<0.05). The positive rates of BCSG1 in patients with different TNM stages after chemotherapy were significantly decreased (p<0.05) and the CT perfusion value of BCSG1 in the low expression group was significantly higher than in the high expression group (p<0.05)., Conclusions: MSCT can accurately evaluate the effect of chemotherapy in breast cancer. The results of MSCT were closely related to the expression of BCSG1, which may provide a reference for predicting the effect of chemotherapy in breast cancer which could have important clinical significance.