摘要
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。
A study was conducted to analyze the stress physiological foundation for heterosis formation of reciprocal hybrids of Paulownia tomentosa × P.fortunei under water stress.Results show that leaves of reciprocal hybrids exhibit four kinds of super-parent heterosis,namely,resistance to water loss and the abilities to maintain chlorophyll mass per unit area,preserve protein mass per unit area and reduce RNase activity under water stress.Results of pretreatment of the leaves by the inhibitor（cycloheximide） of protein biosynthesis under water stress indicated that the increase in RNase activity of the parents might be involved in cytoplasmic mRNA translation,RNase release,activation and/or synthesis of chloroplast and/or mitochondria.However,the increase in RNase activity of the reciprocal hybrids results mainly from cytoplasmic mRNA translation,and it has unobvious relationships with chloroplast and/or mitochondria.It is suggested that the above-mentioned notable super-parent heterosis of resistance to water stress of leaves of the reciprocal hybrids forms the stress physiological foundation for heterosis formation of reciprocal hybrids of P.tomentosa × P.fortunei.
出处
《东北林业大学学报》
CAS
CSCD
北大核心
2011年第4期8-10,17,共4页
Journal of Northeast Forestry University
关键词
毛泡桐×白花泡桐
正反交F1
杂种优势
逆境生理学基础
Paulownia tomentosa ×P.fortunei
reciprocal hybrids F1
Heterosis
Stress physiological foundation
