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以吉林省1923~2008年育成的20个大豆品种为材料,分别于2011和2012年在盛花期(R2期)、盛荚期(R4期)和满粒期(R6期),测定根系伤流液中的总氮含量和功能叶片的净光合速率(Pn),并分析了不同年代育成大豆品种伤流液中总氮含量的变化规律及其与Pn的相互关系。结果表明:遗传改良增加了大豆根系伤流液中的总氮含量;同一大豆品种伤流液中的总氮含量随着生育进程的推进不断降低;不同生育时期伤流液中总氮含量与Pn呈正相关,并在R2期达显著水平(r=0.429 8*)。由此推测大豆植株的根与叶之间存在明显的互作,R2期伤流液中的总氮含量可以作为评价植株光合能力的间接指标。
In this study, 20 soybean cultivars from 1923 to 2008 in Jilin Province were used as material to determine the root traumatic injury in full flowering stage (R2 stage), full heading stage (R4 stage) and full grain stage (R6 stage) in 2011 and 2012, respectively Total nitrogen content and net photosynthetic rate (Pn) of functional leaves, and analyzed the variation of total nitrogen content in wound fluid and the relationship with Pn in different age bred soybean varieties. The results showed that genetic improvement increased the total nitrogen content in the wound fluid of soybean roots. The total nitrogen content in the wound fluid of the same soybean species decreased with the progress of the growth process. The total nitrogen content in the wound fluid at different growth stages was significantly correlated with Pn (R = 0.429 8 *) in R2 stage. Therefore, it is speculated that there is a clear interaction between the roots and leaves of soybean plants. The total nitrogen content in R2 wound fluid can be used as an indirect indicator to evaluate the photosynthetic capacity of the plants.