碱胁迫对不同品种玉米苗期生长生理的影响OA

[Objective]The research on crop stress can screen and cultivate crop varieties suitable for growth and development in saline-alkali environments.[Method]This study mainly adopts the method of laboratory crop variety selection,treating 21 different corn varieties with Na2CO3(0 mmol/L,100 mmol/L)solution for CK treatment and alkali stress treatment,respectively measuring the growth indicators,physiological indicators,and dry matter of seedlings under CK and alkali stress treatment.[Results]Under alkali stress,the growth indicators of corn seedlings decreased,with stem thickness decreasing by 9.98%～12.47%(P＜0.05)compared to CK treatment.The relative chlorophyll content of Ningdan 33,Huayi 204,and Yinyu 238 varieties at the seedling stage decreased under alkali stress compared to CK treatment.Jindan 73,Heqing 157,Deke 622,and Dajingjiu 23 had the strongest root growth resistance to alkali stress,while Ningdan 33 and Ximeng Qingzhu 707 had the high-est alkali resistance coefficients,reaching 0.91 and 0.94,respectively.[Conclusion]Among the 21 varieties,those with better alkali resistance include Jindan 73,Heqing 157,Xianyu 355,followed by Ximen Qingzhu 707,Xianyu 1225,Huayi 204,etc.,This study mainly screened corn varieties suitable for planting in alkalized soil,explored the growth mechanism of alkali-resis-tant corn seedlings,and provided a reference for the selection and breeding of crop varieties in saline-alkali land.