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采用整套“中国春”B组双端体为材料 ,研究了田间条件下不同染色体臂缺失对叶片导度及净光合速率 (Pn)的影响 ,结果表明 :在旗叶一生中 ,气孔导度 (gs)、叶肉导度 (gm)和净光合速率 (Pn)均于叶片全展达到最大值以后逐渐下降 ,胞间CO2 体积比 (Ci)自叶片全展后不断增加。各供试B染色体组双端体材料的叶片导度表现不同 ,染色体臂 1BL、2BL、5BL、6BL、2BS和 3BS对气孔导度 (gs)有正效应 ,7BL和 6BS对gs 有负效应 ;5BL、6BS和 7BS对叶肉导度 (gm)有正效应 ,1BL、6BL、1BS、2BS、4BS和 5BS对gm 有负效应。研究表明 ,gm 是较gs 影响光合作用的更重要因素
The effects of different arm loss on the leaf conductance and net photosynthetic rate (Pn) under field conditions were studied by using the whole set of “Chinese Spring” B group double-ended as the material. The results showed that in the lifetime of flag leaf, stomatal conductance gs, gm and Pn all decreased gradually after the leaves were fully expanded. The volumetric ratio of intercellular CO2 (Ci) increased continuously after the leaves were fully expanded. The results of leaf conductivity showed that there was a difference in leaf conductance between the two ends of B genome. The chromosomes 1BL, 2BL, 5BL, 6BL, 2BS and 3BS had positive effects on stomatal conductance (gs), while 7BL and 6BS had negative effects on gs. 5BL, 6BS and 7BS had a positive effect on the leaf mesenchyme (gm), while 1BL, 6BL, 1BS, 2BS, 4BS and 5BS had a negative effect on gm. Studies have shown that gm is a more important factor that affects photosynthesis than gs