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期 刊 ：植物遗传资源学报 2014年 15卷 1期

关键词：笋瓜；节间长；发育逆转；

Keywords:Cucurbita maxima, Internode length, Developmental reversal of dominance,

摘 要 ：分别以短蔓型和长蔓型笋瓜材料为亲本构建6世代群体，测量各群体不同节位节间长的变化，对节间长性状进行遗传规律分析。研究结果表明：节间长性状受核基因控制，F1群体的节间长性状在生长过程中存在发育逆转现象，逆转时期发生在6-15节位之间。遗传模型分析结果显示，在幼苗期和逆转期，笋瓜的节间长受到两对主效基因控制，符合E1模型，主基因方差能解释F2群体方差的70%以上；生长后期则受到主效单基因控制，符合D4模型，但主效基因效应不强，只能解释F2群体方差的10%，且环境因素对植株生长后期节间长具有明显影响。

Abstract:Genetic population derived from a line ‘Agol’（dwarf ）and ‘Xue1’（vine）was used to analyze the inheritance of internode length in cucurbita maxima. The result showed that dwarf and vine is determined by nuclear genes. Developmental reversal of dominance were found in this study. The genetic model showed that the internode length were controlled by two major gene (genetic model E1) in early development and reversal of dominance stage, and the major gene can explain more than 70% variation. But in the late development stage, it were controlled by a single gene (genetic model D4), which explaining 10% variation. The results also proved that in late development stage environment has significantly effect on internode length development. This study will provide more information for dwarf-type genetic mechanism; also the results will lay a good foundation for cucurbita maxima dwarf-type breeding.

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