论文部分内容阅读
在小麦生育后期，叶片光合速率、ＲｕＢＰｃａｓｅ活性和根系ＴＴＣ还原力、呼吸速率均随生育进程而不断下降，叶片生理功能的衰退速率快于根系。对生育后期上位叶、根系活性氧清除酶活性、细胞活性氧含量以及根、叶激素含量和糖、氮含量的测定结果表明，根系较叶片维持了相对较高的ＳＯＤ活性和ＣＡＴ活性、较低的Ｏ．２产生速率及Ｈ２Ｏ２含量；较高的ＺＲｓ含量和较低的ＡＢＡ含量以及相对较高的糖、氮含量。上述结果可能是小麦生育后期根系生理功能衰退慢于叶片的重要生理生化基础。生育后期根系与叶片生理功能的不断衰退可能还与两者间的相互反馈调节作用有关。
In late growth stage of wheat, leaf photosynthetic rate, RuBPcase activity, root TTC reducing power and respiration rate all declined with the growth process, and the rate of decline of physiological function of leaves was faster than that of roots. The activities of active oxygen scavenging enzyme activity, reactive oxygen species, root activity, leaf hormone contents, sugar and nitrogen contents in the upper leaves during the later growing stage showed that the roots maintained relatively higher SOD activity and CAT activity than the leaves, O 2 production rate and H2O2 content; higher ZRs content and lower ABA content and relatively high sugar, nitrogen content. The above results may be the physiological and biochemical basis of the root physiological decline in wheat late growth stage slower than the leaves. The declining root system and physiological function of leaves at later growth stage may be related to the mutual feedback regulation between the two.