作物学报 ›› 2014, Vol. 40 ›› Issue (08): 1403-1411.doi: 10.3724/SP.J.1006.2014.01403
刘大同,荆彦平,陈晶晶,余徐润,王忠*
LIU Da-Tong,JING Yan-Ping,CHEN Jing-Jing,YU Xu-Run,WANG Zhong*
摘要:
为了探明水稻侧根发育的过程和影响因素,以日本晴(粳稻)、扬稻6号(籼稻)的不定根和种子根为材料,观察了侧根发育过程中的形态和细胞结构的变化;研究了生长调节物质、光照等因子对侧根发育的影响。结果显示,水稻侧根的发生起始于中柱鞘。相邻的内皮层细胞参与了侧根原基的发生和生长。侧根原基通过顶端生长点的分裂、分化和基部细胞伸长向外生长,侧根在露出过程中改变了母根皮层和表皮结构。外源生长素可促进侧根的发生,但浓度过高则抑制侧根原基的露出;稻苗切除芽后侧根发生减少,主根生长量下降;切除根尖打破了主根顶端优势,促进侧根发生和生长。单侧照光能诱导向光侧的侧根发生。脱落酸在低浓度下对侧根发生有促进作用;Ca2+促进侧根发生和主根生长,而EDTA抑制侧根发生和主根生长。种子根和不定根的生长对试验因子的响应趋势基本一致。
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