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水分胁迫状态下,对毛泡桐×白花泡桐正反交F1杂种优势形成的逆境生理学基础的研究表明:杂种叶片具有在水分胁迫状态下抗失水、维持叶绿素单位面积质量、保持蛋白质单位面积质量、降低RNase活力升高速率等4种超亲杂种优势现象。蛋白质生物合成抑制剂亚胺环己酮前处理效应的试验表明:水分胁迫状态下,双亲叶片RNase活力的升高,除涉及到细胞质mRNA翻译外,还涉及到叶绿体和(或)线粒体RNase的释放、活化和(或)合成,而正反交F1杂种叶片RNase活力升高,主要来自于细胞质mRNA的翻译,而与叶绿体和(或)线粒体的关联不密切。认为上述杂种叶片具有的对水分胁迫抗性的显著超亲杂种优势,共同构成了毛泡桐×白花泡桐正反交F1杂种优势形成的逆境生理学基础。
Under the condition of water stress, the physiological basis of adversity formed by F1 hybrid progenies of Paulownia tomentosa × P. bungeana F1 showed that the hybrid leaves had the ability of resisting water loss under water stress, maintaining the mass per unit area of chlorophyll, keeping the mass per unit area of protein, Reduce the rate of increase RNase vitality and other four kinds of super-pro heterosis. Experiments on the pretreatment of protein biosynthesis inhibitor iminocyclohexan showed that the RNase activity of parents was increased under water stress, except for the translation of cytoplasmic mRNA, which also involved the release of chloroplast and / or mitochondrial RNase , And activated and / or synthesized. However, the RNase activity of F1 hybrids increased with the increase of RNase activity, mainly from the translation of cytoplasmic mRNA, but not with chloroplast and / or mitochondria. It is considered that the above-mentioned heterotic leaves have significant super-heterotic advantages to water stress resistance, and together constitute the stress physiology basis for the F1 heterosis of reciprocal reciprocal crossing of Paulownia tomentosa × P. bungeana.