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两种不同基因型小麦京 41 1 (J41 1 ,北京地区高产小麦品种 )和小偃 5 4 (X5 4 ,一种远源杂交品种 )的光合作用对低浓度NaHSO3处理的响应不同。NaHSO31mmol/L处理能够提高京 41 1在CO2 浓度为 3 5 0和 90 0 μL/L的空气中的净光合速率 ;而对小偃 5 4 ,在这两种情况下的净光合速率均无明显影响。以往的研究表明NaHSO3促进光合作用的原因类似于PMS(phenazinemethosulfate) ,都是增加了ATP的合成。此文再次证明并发现经过NaH SO31mmol/L处理后 ,京 41 1叶片作用光关闭后叶绿素荧光瞬时上升的幅度提高 ,远红光后P70 0 +(reactioncenterchlorophyllofPSI)再还原的半时间缩短 ,表明NaHSO3可以促进小麦京 41 1中围绕PSI循环电子传递及其耦联的磷酸化。然而 ,NaHSO3对小偃 5 4的作用光关闭后叶绿素荧光瞬时上升的幅度及远红光后P70 0 +再还原的半时间均无明显影响。与小麦京 41 1相比较 ,小偃 5 4的作用光停止后叶绿素荧光瞬时上升的幅度增大 ,而且其在远红光后P70 0 +再还原的半时间更短 ,表明小偃 5 4的循环电子传递的能力远高于京 41 1的。两种不同基因型小麦对NaHSO3的响应不同很可能是由于二者在循环电子传递能力上有很大的差别。
The photosynthesis of two different wheat genotypes Jijing 1 1 (J41 1, a Beijing high yielding wheat cultivar) and Xiaoyan 54 (X5 4, a distant hybrid cultivar) differed in their responses to low concentrations of NaHSO3. NaHSO31mmol / L treatment could increase the net photosynthetic rate of Jing 41 1 in air with CO2 concentrations of 350 and 90 0 μL / L, while the net photosynthetic rate of Xiaoyan 54 was not significant in both cases influences. Previous studies show that NaHSO3 can promote photosynthesis for a similar reason to PMS (phenazinemethosulfate), both of which increase the synthesis of ATP. This paper proves once again that the transient increase of chlorophyll fluorescence after Beijing 41 1 leaves is closed after NaHSO31 mmol / L treatment increases, and the half-time of reduction of P70 0 + (reactioncenterchlorophyll of PSI) after far-red light decreases, indicating that NaHSO3 can Promote the Circulation of PSI and Its Coupling Phosphorylation in Wheat Jing 41 1. However, there was no significant effect of NaHSO3 on the instantaneous increase of chlorophyll fluorescence and the half-time of P70 0 + re-reduction after Xiaogan 54 was light-off. Compared with the wheat Jing 41 1, Xiaoyan 54 light chlorophyll fluorescence instantaneous increase of the rate of increase, and its far-red P70 0 + half-time after the re-reduction shows that Xiaoyan 54 The ability of circulating electron transfer is much higher than that of Beijing 41 1. The difference in response to NaHSO3 between two different genotypes of wheat is most likely due to the large difference in their ability to circulate electrons.