韭兰的几种花形变异及初步分析

Primary analysis on morphological variation of flower and primary analysis of cause in Zephyranthes grandiflora

关键词:  韭兰  花器官发生  花形变异  原因分析

Key words:  Zephyranthes grandiflora  flower morphogenesis  flower morphological variation  causes analysis

摘要:

首次报道了韭兰的多种花被裂片数目、雄蕊数目及其它变异类型。花被裂片数目变异的频率明显高于雄蕊数目变异。花被筒基部弯曲变异也较常见,而且与花被裂片数目增多的变异存在相关性。跟踪观察结果表明:韭兰的花形变异是不稳定的,但是可以在同一植株中重复出现。分析认为:韭兰的花形变异发生在花亚区的形成期,不能用花器官发育的“ABC模型”以及由“ABC模型”为基础发展而来的“ABCD模型”和“ABCDE模型”解释。其变异原因既与花器官亚区形成的早期调节有关,也与细胞分裂速度改变有关。韭兰的花形变异是相关基因受到体内某种因素的影响所致。花形变异的不稳定性可能与转座遗传因子有关。

Abstract:

Several characters in flowers of Zephyranthes grandiflora were investigated, and various variation were detected. Comparatively,the frequency of variation on number of tepals was obvious higher than that of stamens. The base of perianth tube was commonly bent,and had relativity to the increasing number of tepals. Tracking observation showed:morphological variation in flowers of Z.grandiflora was not stable,but these characters could appear repeatedly in the same plant. It was thought that these variations took place at the stage of forming flower organ subregions,and could not be interpreted by“ABC model”for flower organ development,nor by the advanced“ABCD model”and“ABCDE model”. Variations were not only related to early regulation on the formation of flower organ subregions,but also to the changed rate of cell division. These changes might be the result of the effect of certain internal factors on the expression of the related gene. The instability of morphological variation in flower of Z.grandiflora might be related to transposable genetic element.