不同外源激素对无膜棉花幼苗根系发育的影响

Effects of different exogenous factors on root development of membraneless cotton seedlings

为量化不同外源激素对无膜滴灌棉花根系的调控作用,以中棉619为试验材料,探究了外源GA_(3)、SA和PP_(333)对无膜滴灌棉花幼苗根系生长发育的影响。结果表明,在处理后3~7 d,不同浓度的GA_(3)、SA和PP_(333)均可促进棉花幼苗主根生长;至处理后11 d,与CK相比,0.20 mg/L GA_(3)、0.01 mmol/L SA和0.10 mg/L PP_(333)可分别增加棉花主根长7.3%、35.8%和15.3%;低浓度的GA_(3)(0.05和0.20 mg/L)可促进棉花根系发育,增加棉花总根长和根系总表面积;0.01、0.05和0.10 mmol/L SA均可增加总根长、根系总表面积和根体积;0.50 mg/L PP_(333)对棉花根系总表面积、根体积和根平均直径均有显著促进作用。综上,0.20 mg/L GA_(3)、0.01 mmol/L SA和0.10 mg/L PP_(333)为促进棉花幼苗根系发育的推荐激素及浓度。

To quantify the regulatory effects of different exogenous sources on the root system of cotton without membrane drip irrigation,this study explored the effects of exogenous GA_(3),SA and PP_(333) on the root growth of Zhongmian619 seedlings without membrane drip irrigation.The results showed that,from 3 to 7 days after treatment,different concentrations of GA_(3),SA and PP_(333) could promote the main root growth of cotton seedlings;to 11 days after treatment,compared with CK,0.20 mg/L GA_(3),0.01 mmol/L SA and 0.10 mg/L PP333 can increase cotton taproot length by 7.3%,35.8% and 15.3% respectively;lower concentrations of GA_(3)(0.05 and 0.20 mg/L)can promote cotton root development and increase the cotton root length and root Surface area;0.01,0.05 and 0.10 mmol/L SA could increase total root length,root surface area and root volume;high concentration of PP_(333)(0.50 mg/L)could significantly affect cotton root development and increase total root system Surface area,root volume and average root diameter.In conclusion,0.20 mg/L GA_(3),0.01 mmol/L SA and 0.10 mg/L PP_(333) were the recommended concentrations to promote root development in cotton seedlings.