多效唑浸种对直播粳稻的作用机理

目的]探究多效唑影响水稻(Oryza sativa L.)生长发育的因素。方法]选用3个粳稻品种用100 mg/L多效唑溶液浸种48 h后直播栽培,观察苗情并在成熟后测定经济性状、产量等,以清水浸种处理作为对照。结果]多效唑抑制了秧苗的前期生长,并推迟直播粳稻的生育期,从而延长了水稻的生长周期。多效唑对直播粳稻第1节节长没有抑制效果,也表明对直播粳稻的抗倒伏效果不理想。从与对照的苗数变化来看,多效唑对直播粳稻的分蘖抑制明显,降低了粳稻的分蘖率和成穗率,进而降低了直播粳稻的产量。结论]多效唑浸种使直播稻有减产倾向,因此在水稻直播种植中不建议使用多效唑浸种。

Mechanism of Paclobutrazol Soaking Seeds on Japonica Rice(Oryza sativa L.) Sowing Directly

Abstract Objective ] The aim was to discuss the influencing factors of paclobutt~zol on rice growth and development. Method ] Three differ- ent Japonica rice varieties were soaked into 100 mg/L paclobutrazol solution for 48 hours and then directly sowed to observe their seedling status and determine their economic traits ond yield, taking clear water soaking seeds as control. Result] Paclobutrazol inhibited the early growth of seedlings, delayed the growth period of direct seeding Japonica rice, and further extended the growth cycle of rice. Paclobutrazol had no effect on inhibiting the first section growth of Japonica rice, this also indicated it was little useful to help direct sowing Japonica rice have the ability of lodging resistance. Comparing with the number change of seedlings of the control group, paclobutrazol had a significant inhibitory effect on the tillering rate of direct sowing Japonica rice, and reduced the spike rate of direct sowing Japonica rice and resulted in its low yield. Conclusion~ Pac｜obutrazol soaking seeds makes the direct sowing Japonica rice have yield reduction tendency,so it is not suggested to use paclobutrazol soa- king seeds in rice sowing directly cultivation.