论文部分内容阅读
在红410等十个不同水稻品种中,叶绿素含量和a/b比率存在着品种间显著或极显著的差异性。 14个水稻亲本品种和16个F_1,从孕穗至乳熟期,叶绿素含量逐渐递增,a/b比率逐渐下降。而且叶绿素a、b和(a+b)含量之间的变化具有一定平行关系。在IR661×庚湘等组合中,F_1是随母本变化的,表现出不同程度的母性影响。叶绿素含量a、b和(a+b)两两之间,以及它们与净光合速率(Pn)之间均具有密切的正相关关系,而a/b比率与Pn之间则呈显著负相关。因此,用叶绿素含量作为光合作用的一个生理指标是可行的。从F_1的表现和F_2的众数多峰分布推测,水稻叶片叶绿素含量主要是核遗传,且低含量为显性,叶绿素a和b含量各受不同的单个主效基因控制。选用叶绿素含量适当高而a/b比率较低的水稻品种或品系,在太阳辐射强度较低的地区(如贵州山区)是有一定生产实用价值的。
In the red 410 and other ten different rice varieties, chlorophyll content and a / b ratio there is significant or very significant differences between varieties. Fourteen rice parental varieties and 16 F_1, from booting to milking stage, chlorophyll content gradually increased, a / b ratio decreased. Moreover, the changes of chlorophyll a, b and (a + b) contents have a certain parallel relationship. In the combination of IR661 × Gengxiang, F_1 was changed with the female parent, showing different degrees of maternal effects. There was a close positive correlation between chlorophyll content a, b and (a + b), and their net photosynthetic rate (Pn), while the a / b ratio was significantly negatively correlated with Pn. Therefore, the use of chlorophyll content as a physiological indicator of photosynthesis is feasible. From the F_1 performance and the multimodal distribution of F_2, we speculated that the content of chlorophyll in rice leaves was mainly nuclear and the content was dominant. The contents of chlorophyll a and b were controlled by different single major genes. The selection of rice varieties or lines with suitable chlorophyll content and low a / b ratio will produce some practical value in areas with low solar radiation intensity (such as Guizhou mountainous area).