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Correlation and path coefficient and Chi-square Distance Cluster analysis for Several Characteristics in Tobacco Germplasm Resource

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Journal of Northeast Agricultural University(English Edition) 2010年第1期17卷 10-15页

作者： LI Wenping ZHU Lieshu ZHAO Songyi LIANG Qizheng WANG Yuchao TAN Xi College of Agriculture Hunan Agricutural University Changsha 410128 China South Central Agricultural Experimental Station of China Tobacco Changsha 410128 China

Correlation and path coefficient analyses were conducted for 10 characteristics of 24 pure lines of flue-cured tobacco such as plant height, knot distance, leaf number, the central leaf length and width, ratio of the length to width, stem girth, dates of budding, leaf yield and ratio of the prime-medium tobacco. The leaf number and the central leaf length showed a positive or a strong positive correlation with the yield per plant. And the leaf number and leaf yield per plant showed a strong positive correlation with the ratio of prime-medium tobacco. The results showed that the leaf yield per plant among these characteristics played a major role in determining the ratio of prime-medium tobacco while the others were less related with the ratio. Square sum of deviation method cluster analyses showed that 24 pure lines of flue-cured tobacco were clustered into two groups. Of the pure lines, Line T1706 and Line T1245 had a far relationship with all other lines, and also had a heterosis when crossed with the other lines. Lines Guangdonghuang 1 and R72（3）B-2-1 were closely related.

关键词： flue-cured tobacco correlation analysis path coefficient analysis cluster analysis

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Salinity Tolerance in Argentinean Population of <i>Bromus catharticus</i>. Variability and Direct and Indirect Effects on Seedling Characters

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American Journal of Plant Sciences 2020年第12期11卷 2043-2058页

作者： Monica Beatriz Aulicino Monica Beatriz Collado Hernan Barca Maria del Carmen Molina Instituto Fitotécnico de Santa Catalina Facultad de Ciencias Agrarias y Forestales Universidad Nacional de La Plata La Plata Argentina

The aim of this research was to evaluate the salinity tolerance in prairie grass populations at the seedling stage quantifying the variability and the influence of physiological traits related to it. Salinity tolerance, in Bromus catharticus Vahl (prairie grass) populations collected in different environments of the Pampean Phytogeography region (Argentine) was evaluated at the seedling stage, using controlled condition of temperature and light. It was adopted a completely randomized design using 3 plots with three plants each one per population and two levels of treatment: 0 mM and 100 mM NaCl. Morphological, biomass and membrane stability root and shoot traits were studied. A factorial ANOVA with interaction was estimated. Then one way ANOVA for all seedling traits in both treatments allowed estimating variance components, coefficient of genotypic determination (CGD) and variation index (VI). Comparisons between populations were made using Tukey test (at 5% of probability). Phenotypic correlations among traits were calculated and then a path coefficient analysis separated direct and indirect effects at 100 and 0 mM NaCl. No significant interactions “Population × Treatment” were found for any character. The saline stress caused a pairing in the population means for the most traits. coefficients of variation were mainly higher when the seedlings grew without stress (0 mM) because it allowed a greater potential genotypic expression. The absence of significant interactions denotes a good homeostatic capacity of the prairie grass facing that abiotic stress. Leaf length, shoot length and root dry matter were the variables with the largest direct and indirect effects. Our results showed an increase for them at salt and demonstrated intraspecific variation, possibly in relation with the origin sites. Plants under stress showed a marked resilience, in order to quickly restore the sa

关键词： Bromus catahrticus Prairie Grass Salinity Tolerance Population Genetic Variability path coefficient analysis

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