Study on Photosynthetic Parameters in Leaves Senescence of Soybean Varieties Released at Different Ages in Jilin Province
In order to find out the change of photosynthetic parameters during the senescence of soybean cultivars released in different ages in Jilin province,The time from 1923 to 2006 was devided into four periods:The first period was before 1960,the second period was 1961-1980,the third period was 1981-2000 and the fourth period was after 2001.Twenty soybean cultivars released in different periods of Jilin province were used for field experiment.The photosynthetic parameters of leaves were measured by Li-6400 photosynthesis apparatus at R2 (flowering stage),R4 (podding stage),R6 (granule stage) and R7 (maturation stage).The results showed that during R4,R6 and R7 the net photosynthetic rate,chlorophyll content and specific leaf weight of soybean cultivars cultivated in different periods were as follows:the first period ＜ the second period ＜ the third period ＜ the fourth period.In the process of senescence,the net photosynthetic rate,stomatal conductance,transpiration rate and chlorophyll content of soybean cultivars from different stages of R4 to R6 were as follows:the first period ＞ the second period ＞ the third period ＞ the Four periods.From the R6 to the R7 stage,the specific leaf weight decline ratio performance as follows:the first period ＞ the second period ＞ the third period ＞ the fourth period.This indicated that with the genetic improvement of the varieties,the photosynthetic parameters of soybean leaves were improved,the photosynthesis of the leaves was increased,the photosynthetic time was prolonged,and the leaf senescence was delayed,which laid the material foundation for the improvement of the yield.
国家科技期刊平台
NSTL
万方数据
维普
