摘要
通过开展低温下棉种萌发试验,研究不同外源物质对棉种低温萌发的影响,并筛选出最佳浓度的外源调节物质。结果显示8种外源物质均不同程度提高低温胁迫下棉种的发芽率、发芽势和发芽指数(GI),缩短平均发芽时间(MTG),其中以赤霉素(GA3)效果较好。新陆早65号和海岛棉35号经100mg·L^(-1)GA3处理后,其发芽率、发芽势和GI在15℃(光照)/12℃(黑暗)下平均增加26.50%、7.75%和4;在28℃(光照)/25℃(黑暗)下平均增加5.25%、13%和6.14,MTG降低0.94d;而20mg·L^(-1)的抑制剂脱落酸和5.88mg·L^(-1)的多效唑对棉种萌发的抑制作用最大,综合比较发现外源GA3对低温下棉种的萌发效果最好。
The effects of different exogenous substances on cottonseed germination at low temperature were studied,and the optimal concentration of exogenous regulatory substances was screened.The results showed that the 8 exogenous substances increased the germination rate,germination potential and germination index(GI),and shortened the average germination time(MTG).And the gibberellin(GA3)had the best effect among 8 exogenous.After 100mg·L^(-1) GA3 treatment,the germination rate,germination potential and GI of Xinluzao No.65 and island cotton No.35 increased by 26.50%,7.75%and 4,respectively,on average at 15℃(light)/12℃(dark).At 28℃(light)/25℃(darkness),the average increase was 5.25%,13%,6.14,respectively,MTG decreased by 0.94d.Abscisic acid(20mg·L^(-1))and paclobutrazol(5.88mg·L^(-1))had the greatest inhibitory effect on cotton seed germination.Comprehensive comparison showed that exogenous GA3 had the best effect on cotton seed germination at low temperature.
作者
夏军
吴强
夏钦
王宏军
XIA Jun;WU Qiang;XIA Qin;WANG Hong-jun(Shaanxi Agricultural Technology Promotion Station,Xi’an 710003,Shaanxi;College of Agriculture,Shihezi University/Key Laboratory of Oasis Eco-Agriculture,Xinjiang Production and Construction Corps,Shihezi 832003,Xinjiang;Shaanxi Academy of Agricultural Sciences,Xi’an 710000,Shaanxi)
出处
《绿洲农业科学与工程》
2021年第2期23-28,共6页
Oasis Agriculture Science and Engineering
关键词
棉种
低温
外源调节物质
萌发特性
Cotton seed
Low temperature
Exogenous regulatory substances
Germination characteristics