Changes of Some Physiological Characteristics and Agronomic Traits during Genetic Improvement of Soybean Cultivars in Jilin Province of China
Soybean yield in the world increased significantly with year of release.Future yield increase may be dependent on an understanding of the changes in soybean cuhivars made by breeding and selection.However,the yield of new soybean cuhivars did not show a linear increase in recent years in China.This may be related with that no clear physiological indexes were used for the selection of high yield soybean cuhivars.The objective of this paper is to provide a review on some physiological characteristics changes associated with yield increase during the genetic improvement of soybean from 1923 to 2005 in Jilin province.At the same time,in order to evaluate the changes of physiological characteristics,a comparison between some physiological characteristics and some agronomic traits was made.We found that the genetic improvement of agronomic traits by soybean breeding has made obvious progress,meanwhile,some physiological characteristics were improved,while the percentage changes of physiological characteristics were smaller than those of agronomic traits.The genetic improvement of some physiological characteristics,such as,photosynthetic ability,apparent mesophyll conductance(ALMC),nitrate reductase activity(NRA),the number of nodule still have huge yield potentiality.Soybean breeding with physiological characteristics as breeding targets will have big improvement in soybean yield.
国家科技期刊平台
NSTL
万方数据
维普
