Abstract
In this research study, we determined nine phenotypic traits, dry matter yield, canopy height, panicle height, stem diameter, shoot density, leaf length, leaf width, leaf stem ratio, and moisture content, of 32 samples collected from the following subregions, Huanghuai plain(ⅢD9a), Jianghan plain(ⅢD9b), South Jiangxi-Eastern Hunan hilly(ⅢD9d), Sichuan, Hubei, and Hunan subregion(ⅢD10c). The above traits were determined usingnested, partial correlation, and unweighted pair group method with arithmetic mean (UPGMA)cluster analyses. The study revealed the following results. 1)The coefficient of variation range of all nine phenotypic traits was 13.53%~45.54%, and they showed extremely significant changes based on subregions, but only six traits(dry matter yield, canopy height, panicle height, stem diameter, shoot density, and moisture content) changed significantly between subregions. 2)There were significant positive correlations between dry matter yield and stem diameter, canopy height and panicle height or moisture content, stem diameter and leaf stem ratio, leaf width and leaf length, altitude and shoot density, and latitude and shoot density. However, significant negative correlations were observed between dry matter yield and leaf to stem ratio, leaf width and moisture content, altitude and canopy height or stem diameter, longitude and dry matter yield, and latitude and stem diameter. 3)The UPGMA clustering analysis showed that four floras could be divided into three categories. Huanghuai Plain and Jianghan Plain subregions belong to group Ⅰ, and they were shorter, thinner, and produced a lower yield. The South Jiangxi-Eastern Hunan Hilly,Sichuan, Hubei, and Hunan subregions belong to group Ⅱ, and they were longer, thicker, and showed higher yields. Furthermore, the South of Jianghan Plain, South Jiangxi-Eastern Hunan hilly, and Sichuan-Hubei-Hunan subregions belong to group Ⅲ, and they showed characteristics that were between those of group Ⅰ and Ⅱ.
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