论文部分内容阅读
运用LI-6400便携式光合作用测定系统比较科尔沁沙地大田种植的绿豆(Phaseolus radiatus L.)和大豆(Glycine max)两种豆科作物的净光合速率(Pn)、胞间CO2浓度(Ci)、气孔导度(Gs)的日变化;同时用便携式荧光仪(Handy-PEA)测定了PSⅡ最大量子效率(Fv/Fm)和PSⅡ最初电子受体QA的库容(Sm)的日变化。两种作物叶片净光合速率(Pn)的日变化曲线均为单峰曲线,峰值均在08:00;且08:00后绿豆叶片Pn均大于大豆。气孔导度在全天进程中一直呈下降趋势;分析表明:10:00—14:00Pn的降低的主要原因是非气孔因素。与大豆相比,光照强烈(>1 455μmol.m-2.s-1)的时段(08:00—14:00),绿豆能够更有效地调控Ci、Gs、Fv/Fm和Sm。另外,与7月下旬开花期研究结果相比,随着环境条件的变化和植物的生长发育期的不同,绿豆调节其光合适应对策:气孔调节能力增强,叶片对流经PSⅡ的电子传递的调控能力增强。因此,较高的适应强烈光照的能力和对环境条件变化快速响应的能力有利于绿豆在科尔沁沙地灌溉不便的雨养农田中进行广泛栽培。
The net photosynthetic rate (Pn) and intercellular CO2 concentration (Ci) of two leguminous crops, Phaseolus radiatus L. and Glycine max, grown in the field of Horqin sandy land, were compared using LI-6400 portable photosynthesis system. Diurnal variation of stomatal conductance (Gs) was determined. The diurnal changes of maximum quantum efficiency of PSⅡ (Fv / Fm) and storage capacity (Sm) of PS Ⅱ initial electron acceptor QA were measured by portable fluorometer (Handy-PEA) The diurnal variation curves of net photosynthetic rate (Pn) of the two crops were all unimodal curves with peak values at 08:00; and the Pn of mung bean leaves was greater than that of soybean after 08:00. Stomatal conductance showed a downward trend during the whole day. The analysis showed that the main reason for the decrease of 10: 00-14: 00Pn was non-stomatal factors. Compared with soybean, mung bean can regulate Ci, Gs, Fv / Fm and Sm more effectively (> 1 455μmol.m-2.s-1) during the period of 08: 00-14: 00. In addition, compared with the results of flowering in late July, with the changes of environmental conditions and the growth and development of plants, mung bean regulated its photosynthetic adaptation strategies: enhanced stomatal regulation and regulation of leaf electron transport through PSⅡ Enhanced. Therefore, the higher ability to adapt to intense light and the ability to respond quickly to changing environmental conditions are conducive to the extensive cultivation of mung beans in rain-fed farmland where irrigation is not convenient in Horqin Sandy Land.