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引言据报导,杂种优势的不同生理方面包括矿质代谢(Rees和Hassouna1964),硝酸盐还原酶的活性(Hageman et al、1963,Shrader et al1966),过氧化氢酶活性(Beckman和Scadolis1964),线粒体的杂种优势(Sarkissian1967)和光合作用的杂种优势(Heichel和Musgrave1969)。Heichel和Musgrave(1969)观察到来自不同亲缘自交系的玉米单交种,具有高的单位叶面积光合速率。在我们的研究中,对光合速率不仅根据叶面积来估算,而且还根据叶的含氮量、叶绿素和干物质的含量来估算。
Introduction Various physiological aspects of heterosis have been reported to include mineral metabolism (Rees and Hassouna 1964), nitrate reductase activity (Hageman et al, 1963, Shrader et al 1966), catalase activity (Beckman and Scadolis 1964), mitochondrial Heterosis (Sarkissian 1967) and heterosis of photosynthesis (Heichel and Musgrave 1969). Heichel and Musgrave (1969) observed that maize crosses from different genetic inbred lines had high photosynthetic rate per leaf area. In our study, the photosynthetic rate was estimated not only from the leaf area but also from the leaf nitrogen content, chlorophyll and dry matter content.