Comparative Studies on the Photosynthesis and Yield Characteristics among Green, Brown and White Fiber Cotton Varieties
Using brown-fiber cotton (Wanmian 38), green-fiber cotton (Wanmian 39), and the'parental material called white-cotton (Wanmian 25) as experimental materials to analyze the differences of the photosynthesis character and yield in the three lines. The results indicated,compared with the white cotton, colored cottons had a relatively lower increasing rate and less amount of dry matter in the former and middle growth period, also chlorophyll' content were lower. In addition, leaf area indices of colored cotton went up mainly in the early growth stage, but they fell down fast after the full bloom stage. Just as photosynthetic rate, the green-fiber cotton and brown-fiber cotton were slightly higher than that of the white-cotton during the former full bloom stage, but obviously lower than the white-cotton during the later full bloom stage. In this study, there were two obvious peaks in diurnal variation of photosynthetic rate at 10:00am and 16:00pm among the three varieties. In comparison of white-cotton, the "nap phenomenon" of colored cottons were not obvious and their photosynthetic rate dropped within a small range, besides, the recovery time was short and the toler-ance to drought was stronger. Moreover, yields of the white-cotton were significantly higher than those of brown-fiber cotton and green-fiber in this paper.
国家科技期刊平台
NSTL
万方数据
维普
