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The genetic relationship of the collected Dendrobium germplasm resources was analyzed by SNP marker technology to provide theoretical basis for the selection of new varieties breeding parents. Total 60 Dendrobium germplasm resources were used for SNP marker development and genetic relationship analysis using specific-locus amplified fragment sequencing technology（SLAF-seq）. The sequencing data of each sample were statistically analyzed, and 157.34 Mb Clean Reads data were obtained. The Reads data of each sample ranged from 576 195 to 5 359 710. The average sequencing quality value（Q30）and GC content of samples was 93.85% and 40.16%. Through sequencing data analysis, a total of 1 337 217 SLAF tags and 1 049 638 polymorphic SLAF tags were obtained. The average sequencing depth of the tags was 9.63×.A total of 11 248 186 population SNP markers were developed. The number of SNP markers in each sample ranged from 694 015 to 6 367 379. The integrity ratio was 2.71% to 24.89%, and the hetloci ratio was 1.13% to 5.74%. The population SNPs were filtered, and a total of 31 499 highly consistent and effective SNP markers were obtained. The phylogenetic tree was constructed by using the SNP markers obtained. The 60 Dendrobium germplasm resources were divided into 3 subgroups. These three subgroups contained germplasm resources: Q1（3）, Q2（21）, and Q3（36）. The results of germplasm clustering were basically consistent with the morphological classification. Using SLAF-seq technology can efficiently and accurately develop SNP markers suitable for the genetic analysis of Dendrobium. The SNP markers developed may provide molecular basis for Dendrobium breeding, genetic map construction, variety identification and association analysis of agronomic traits. [ABSTRACT FROM AUTHOR]

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Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Southern Agriculture is the property of Journal of Southern Agriculture and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

[Objective] In order to use Phalaenopsis ge mi plasm resourees and perfeet the systematic classification of Phalaenopsis, stomal al characteristics were studied, then the indexes were evaluated by correlation analysis and cluster analysis of Phalaenopsis leaves. [MethodJ 25 cultivars of Phalaenopsis were used as test materials, their 13 stomatal characteristics index (The number of upper epidermis cells, the stomatal number of upper epidermis, the number of lower epidermis cells, the stomatal number of lower epidermis, the stomatal density, the stomatal index, the outer longitudinal diameter, the outer transveise diameter, the inner longitudinal diameter, the inner transveise diameter, the stomatal opening, the stomatal area and the stomatal ratio) were measured and analyzed. [Result] (i) The cell shape of the upper and lower epidermis of the Phalaenopsis leaf was polygonal irregular, and the arrangement of stomata was irregular. (ii) There were significant differences in the stomatal charactal of Phalaenopsis. The stomatal characteristics of 20 Phalaenopsis cultivais were more than that of the lower epidermis, accounting for 80% of the total. No stomatal apparatus was found in the lower epidermis of R7. The outer longitudinal diameter, inner longitudinal diameter, inner transverse diameter, stomatal opening, stomatal area and stomatal ratio of R7 were the smallest a-mong the tested varieties, which were 18.48 mm, 8.3 mm, 9.99 mm, 84.6, 375.92 mm2 and 0.72, respectively. From 0.72 to 1.35, the shape of stomatal oigans of Phalaenopsis species was mainly round or oblate, which was consistent w ith the visual observation. (iii) Correlation analysis showed that there was a high correlation between stomatal indexes of the 13 leaves. (hr) Through the principal component analysis, 13 stomatal characteristics could be synthesized into4 principal components, and the cumulative contribution rate of the fiist four principal components was 91.062%. (v) The result of cluster analvsis showed that 25 Phalaawpsis could be divided into 3 categories at Euclidean distance of 15, category I included 2 species of large flower with purple-red lines, cat eg or)-1(included 1 specie of small flower with purple-red lines, and category III included 22 species of flower with unline or unpuiple-red lines. [Conclusion] The stomatal characteristics could be used as one of the criteria for classification of Phaloenopsis. [ABSTRACT FROM AUTHOR]

Ｖａｎｄａ ｂｉｃｏｌｏｒ Ｇｒｉｆｆ. ｏｆ Ｏｒｃｈｉｄａｃｅａｅ ｆｏｕｎｄ ｉｎ Ｍｏｔｕｏ Ｃｏｕｎｔｙ, Ｔｉｂｅｔ ｏｆ Ｃｈｉｎａ, ｉｓ ｒｅｐｏｒｔｅｄ ａｓ ａ ｎｅｗｌｙ ｒｅｃｏｒｄｅｄ ｓｐｅｃｉｅｓ ｆｒｏｍ Ｃｈｉｎａ. Ｖ. ｂｉｃｏｌｏｒ Ｇｒｉｆｆ. ｉｓ ｓｉｍｉｌａｒ ｔｏ Ｖ. ｂｒｕｎｎｅａ Ｒｃｈｂ. ｆ. ｉｎ ｍｏｒｐｈｏｌｏｇｙ, ｂｕｔ ｉｔ ｉｓ ｅａｓｉｌｙ ｄｉｓｔｉｎｇｕｉｓｈｅｄ ｆｒｏｍ ｔｈｅ ｌａｔｔｅｒ ｂｙ ｉｔｓ ｐｉｎｋ ｏｒ ｙｅｌｌｏｗｉｓｈ－ｇｒｅｅｎ ｕｎｓｔｒｉｐｅｄ ｍｉｄ－ｌｏｂｅ ｏｆ ｌｉｐ, ａｐｅｘ ｎａｒｒｏｗｌｙ ｅｍａｒｇｉｎａｔｅ. Ｄｅｔａｉｌｅｄ ｍｏｒｐｈｏｌｏｇｉｃａｌ ｄｅｓｃｒｉｐｔｉｏｎ ａｎｄ ｃｏｌｏｒ ｐｌａｔｅｓ ｏｆ ｔｈｅ ｎｅｗｌｙ ｒｅｃｏｒｄｅｄ ｓｐｅｃｉｅｓ ａｒｅ ａｌｓｏ ｐｒｏｖｉｄｅｄ. Ｔｈｉｓ ｓｔｕｄｙ ｐｒｏｖｉｄｅｓ ａ ｂａｓｉｓ ｆｏｒ Ｏｒｃｈｉｄａｃｅａｅ ｐｌａｎｔｓ ｒｅｓｅａｒｃｈ, ａｎｄ ｈａｓ ｃｅｒｔａｉｎ ｓｉｇｎｉｆｉｃａｎｃｅ ｔｏ ｅｎｒｉｃｈ ｉｔｓ ｓｐｅｃｉｅｓ ｄｉｖｅｒｓｉｔｙ. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Southern Agriculture is the property of Journal of Southern Agriculture and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Guihaia is the property of Guihaia Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Genetic variation characteristics and important quantitative traits of phalaenopsis flower diameter were studied to provide reicrences for rationally evaluating, exploring and utilizing the existing germplasm resources. IS varieties of Phalaenopsis were used as materials. 10 quantitative traits and flower diameter were measured. The data were statistically processed using correlation, path, and stepwise regression analyses , and multivariate regression equations were calculated. The results were as follows. (i) The correlation coefficients were difierent between Phalaenopsis flower diameter and each quantitative trait, and the correlation coefficient of nr3 (sepal length),( sepal width) , *7 (petal length) and % (petal width) was over 0.9. (ii)The path coefficients of %s for flower length were the largest, 1.805, and was significant different ({ =0. 05) ; (iii) The multivariate regression equation was j\ — 3. 685 t 2. 546ut5 for flower length, and -4. 884 t 0. 395yj +0.017*I +0.062 x2 +0.074 -0.03 -r4 +0.45 x5 -0. 14 x6 -0.252 r7 +0.65 r8 +0.392 x9 -1.067 vLf} for flower width. It can be concluded that the highest correlation is between phalaenopsis flower diameter and sepal length. Sepal length is the main factor affecting flower diameter, so sepal length can be used as the top breeding parameter for increasing flower diameter. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Southern Agriculture is the property of Journal of Southern Agriculture and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Southern Agriculture is the property of Journal of Southern Agriculture and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Southern Agriculture is the property of Journal of Southern Agriculture and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)