干旱胁迫及复水条件下烯效唑对大豆幼苗形态和生理特性的影响

Effects of plant growth regulator S3307 on morphological and physiological characteristics of soybean seedling under drought stress and rewater treatment

以干旱敏感品种SN14和耐旱品种HN64为试材,采用盆栽试验方法,于大豆三叶期喷施植物生长调节剂烯效唑（S3307）,研究干旱胁迫及复水条件下调节剂对大豆幼苗形态和生理指标的影响。结果表明：干旱胁迫及复水条件下,S3307处理的两品种株高均小于CK,显著增加了两品种的茎粗、根长和根干重,增强了植株抗旱能力。在轻度（60%-70%）、中度（50%-60%）和重度（35%-50%）干旱胁迫条件下,SN14-S3307和HN64-S3307处理的叶片相对电导率分别比SN14-CK和HN64-CK减少51.10%、31.13%、46.03%和49.00%、12.00%、42.00%;SN14-S3307和HN64-S3307处理的叶片相对含水量分别比SN14-CK和HN64-CK增加8.96%、4.74%、7.87%和15.23%、14.01%、7.00%;SN14-S3307和HN64-S3307处理叶绿素含量分别比SN14-CK和HN64-CK增加5.22%、4.66%、2.24%和8.00%、7.59%、3.61%。综上所述,三叶期喷施烯效唑能够提高大豆苗期的抗旱能力,起到壮苗的作用。

In this research,soybean was employed as the experimental material by greenhouse to studied the effects of 50 mg·L^-1 S3307 treatment under drought stress and rewater condition on the morphology and physiology of soybean seedling.The results showed that plant heights with S3307 treatment were shorter than those in CK by reducing water consumption.Stem diameter,root length and root weight were increased by the S3307 treatment to have improved drought tolerance capability.Under mild drought（60%- 70%）,moderate drought（50%-60%） and severe drought（35%-50%）,leaf conductance were decreased 51.10%,31.13%,46.03% and 49.00%,12.00%,42.00% of by SN14- S3307 and HN64- S3307 than SN14- CK and HN64- CK;relative water content were increased 8.96%,4.74%,7.87% and 15.23%,14.01%,7.00% by SN14- S3307 and HN64- S3307 than SN14- CK and HN64- CK;and chlorophyll content were increased 5.22%,4.66%,2.24% and 8.00%,7.59%,3.61% by SN14- S3307 and HN64- S3307 than SN14- CK and HN64- CK.In summary,PGRs spraying is important for soybean seedling and drought resistance at the three-leaf stage.