通过测定乙草胺对16个品种水稻生长的影响，研究不同品种水稻对乙草胺的敏感性及其与品种类型之间的关系。培养皿法测定乙草胺对水稻发芽的影响，琼脂法测定乙草胺对各品种水稻苗、根长度及重量等指标的抑制作用。乙草胺对水稻种子发芽有抑制作用；低浓度时乙草胺对水稻的株高、根数有促进作用，当乙草胺浓度达到一定值，则对水稻生长有较强的抑制作用，且对根的抑制作用比对茎的抑制作用更强；供试品种中‘泗稻’耐药性最强，‘天优3301’敏感性最高，0.02 mg/L乙草胺琼脂培养基培养对2个水稻品种的苗长、苗鲜重、根长、株鲜重及根数平均抑制率分别为1.46%、6.42%、51.06%、60.87%和-6.45%（‘泗稻’）；21.62%、22.62%、63.16%、74.76%、3.89%（‘天优3301’）。不同品种水稻对乙草胺的敏感性存在显著差异，且该差异与品种类型相关性不强。
Abstract
This study was to focus on the sensibility of different rice species to acetochlor. Effects on rice sprout by acetochlor were studied by Petri dish method. The inhibitive effects on shoots, roots and fresh weights among different rice species were determined through the whole plant bioassay based on agar medium. The results showed that acetochlor had influence on the rice sprout. Acetochlor at low concentration could promoted the growth of rice shoots and roots, but it had strong inhibitory effect on them when acetochlor was applied at certain higher concentration and caused stronger inhibition to the roots than the shoots. Sensibility of different rice species to acetochlor was different. Among the sixteen rice species,‘Sidao’was the strongest resistant species, while‘Tianyou3301’the highest sensitive species. With application of 0.02 mg/L of acetochlor to rice seedlings, the inhibition ratio in shoots length, fresh shoots weight, roots length, fresh roots weight and roots number of‘Sidao’species were individually 1.46%, 6.42%, 51.06%, 60.87% and -6.45%, while those of‘Tianyou 3301’species 21.62%, 22.62%, 63.16%, 74.76% and3.89%. There was significant difference in the sensibility of rice among 16 different rice species to acetochlor and the correlation between the difference and species is irrelevant.
关键词
水稻； 乙草胺； 敏感性
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Key words
rice; acetochlor; sensibility
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