乙烯利催熟对油菜产量和品质的影响OA

To explore the effects of ethephon ripening acceleration on yield and quality of different rapeseed(Brassica napus L.)culti-vars,three rapeseed varieties/lines(Shuangyou 195,PW-1B and 19FW-1)were used as experimental materials.Four ethephon con-centrations(500,750,1 000 and 2 000 mg/kg)and three spraying dates(17 May,20 May and 22 May)were arranged for the ripen-ing-accelerating trial.After harvest,the moisture contents of pod husks,seeds and straws,as well as yield and quality traits of plants were determined.The results showed that except for a few treatments,the moisture contents of pod husks,straws and seeds of three rapeseed varieties/lines were markedly lower than those of the control.In terms of germination rate,all treated Shuangyou 195 samples maintained a germination rate above 90％.No significant differences in germination rate of 19FW-1 were detected between ethephon treatments and the control,whereas low-concentration ethephon applied at the early stage significantly impaired the germination rate of PW-1B.The grain yield of all tested varieties/lines declined to varying extents,with cultivar-specific discrepancies among geno-types.Quality analysis showed that after ethephon spraying for Shuangyou 195,the contents of high oleic acid,oleic acid,linolenic ac-id,palmitic acid and stearic acid decreased,while the contents of linoleic acid and protein increased.For PW-1B,the contents of glu-cosinolate,high oleic acid,linolenic acid,palmitic acid and stearic acid were reduced,whereas linoleic acid and protein contents were elevated.For 19FW-1,the contents of glucosinolate,high oleic acid,oleic acid,linolenic acid,protein,palmitic acid and stea-ric acid decreased,and only the linoleic acid content increased.Considering the comprehensive performance of yield and quality,eth-ephon could be practically applied for ripening acceleration in rapeseed production.For the cultivar Shuangyou 195,2 000 mg/kg ethe-phon was recommended to be sprayed at 7-8 days before harvest with appropriately advanced harvesting time.For the colored rapeseed lines PW-1B and 19FW-1,spraying concentrations of 2 000 mg/kg and 1 000 mg/kg ethephon at 5-6 days before harvest were the op-timal treatments,respectively.