【摘要】 研究了不同时期施用萘乙酸 (NAA)和烯效唑对根系的调控作用 ,结果表明NAA和烯效唑移栽前浸根和抽穗前喷施都能有效促进根系的生长 ,提高灌浆成熟期根系的功能和活力 ,延缓后期根系的衰老。NAA处理对前期根系生长的促进作用较大 ,但使后期根系活力衰退加快 ;烯效唑则使根系的生长总体上趋于平缓 ,即适当减弱前期生长 ,加强中后期根系生长。抽穗前喷施对改善后期根系的生长和活性作用更大。各处理在影响根系的同时 ,使产量结构发生改变。更多还原

【Abstract】 When rice roots were soaked with naphthylacetic acid(NAA) and uniconazole before transplanting or sprayed on plants before heading, rice root growth, root vigor and function were improved at grain-filling and ripening stages, and root senescence was delayed. NAA had more effect on accelerating root growth at early stage, and making root activity decline quickly at late ripening stage; Uniconazole made root grow more evenly in the whole growth period, namely moderately weakened root growth at early stage and strengthened at late stage. NAA and uniconazole sprayed on plant before heading were more effective on improving root growth and activity at late stage than soaking root before transplanting.更多还原