In order to explore the changes of soluble sugar content in root bleeding sap during the genetic improvement of soybean varieties and its relationship with the plant photosynthesis, 22 soybean varieties bred in Jilin Province during 1923 - 2004 were measured to study the change of soluble sugar content in root bleeding sap and its relationship with the net photosynthetic rate (Pn) of the function leaf in 2010 and 2011. The results showed that while root bleeding sap mass increased with genetic improvement of soybean cultivars, similar to the soluble sugar content in roots bleeding sap, and the correlation of soluble sugar content with year of release reached a significant positive level at flowering stage (R2). Maximum soluble sugar content was measured at R2, while at pod growth stage (R4) and seed filling stage ( R6) , soluble sugar content in root bleeding sap were extremely low. The relevant analysis of soluble sugar content of bleeding sap and Pn at R2, R4 and R6 showed that soluble sugar content was significantly correlated with Pn at R2, but the correlation was not remarkable at R4 and R6. It was suggested that R2 soluble sugar content in root bleeding sap could be used as an index of plant photosynthetic capacity.%为探究大豆品种在遗传改良过程中根系伤流液中可溶性糖含量的变化及与植株光合的关系,于2010-2011年,选用吉林省1923-2004年间育成的22个大豆品种,研究根系伤流液中可溶性糖含量变化及其与功能叶片净光合速率(Pn)的关系.结果表明,大豆品种的遗传改良在增加根系伤流液质量的同时,伤流液中可溶性糖含量也得到增加,其中盛花期(R2)根系伤流液中可溶性糖含量与品种的育成年份呈显著正相关变化.可溶性糖含量在盛花期(R2)最高,结荚期(R4)和鼓粒期(R6)根系伤流液中可溶性糖含量极低.对R2、R4和R6伤流液中可溶性糖含量与Pn的相关分析表明,R2可溶性糖含量与Pn呈极显著正相关,R4、R6相关不显著.R2根系伤流液中可溶性糖含量可以作为植株光合能力的参考指标.
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