Morphological and physiological identification of a Ds-tagged lodging mutant in rice | 水稻Ds插入易倒伏突变体的形态和生理鉴定

chinois. 为了从形态学和生理学角度初步分析水稻Ds插入突变体出现倒伏的可能原因，继而为进一步开展水稻倒伏相关基因的功能研究提供参考，比较了该突变体与野生型在株高、茎上各主要节间的长度、粗度、茎壁厚、叶鞘厚度以及根、茎、叶片、叶鞘、穗和稃片中纤维素和硅含量的差异。结果显示，易倒伏突变体各主要器官中纤维素含量均明显下降，硅在各器官中的分配方式也出现不同于野生型的变化。研究表明，各器官中纤维素含量下降引起的植株机械强唐减弱可能是导致突变体易于倒伏的主要原因。[著者文摘]

anglais. With an objective to identify possible causes for stem lodging in a Ds-tagged rice mutant, and provide references for further functional analysis of genes that are associated with stem lodging, some morphological and physiological comparisons of the Ds-tagged mutant with wild-type rice plants were made based on measurements of plant height, and the internodal length, culm diameter, culm wall thickness and leaf sheath thickness of each internode. Moreover, the cellulose content and silicon content in roots, stems, leaf blades, leaf sheaths, panicles, and hulls were also determined, respectively. The results showed that a significant reduction in cellulose content was observed in each organ of the lodging susceptible mutant, and the silicon deposition and distribution in various organs of the mutant were found to be different from that of the wild-type. It is suggested that the reduction in cellulose content in each organ probably results in the insufficient mechanical strength in the Ds-tagged mutant plants, and thereby make them susceptible to lodging.