河南农业科学2025，Vol.54Issue(2)：116-123,8.DOI:10.15933/j.cnki.1004-3268.2025.02.013
不同抗旱型芜菁幼苗对干旱胁迫及复水的生理响应差异
Differences in Physiological Responses of Different Drought-tolerant Turnip Seedlings to Drought Stress and Rehydration
摘要
Abstract
In order to clarify the effects of drought stress and rehydration on the physiological characteristics of turnip seedlings[Huangqiamagu(B1):drought-resistant type;Qiamagu(B2):drought-sensitive type)],pot culture was used to control water.The relative conductivity,malondialdehyde(MDA),osmotic adjustment substances[soluble sugar(SS),soluble protein(SP),proline(Pro),reducing sugar],antioxidant enzymes[superoxide dismutase(SOD),peroxidase(POD),catalase(CAT)],functional substances(total phenols,flavonoids,anthocyanins)and endogenous hormones[auxin(IAA),abscisic acid(ABA),trans-zeatin nucleoside(ZR),gibberellin(GA3)]of leaves after mild drought stress and severe drought stress and rehydration were studied.The results showed that with the increase of drought degree,the relative conductivity and MDA content of leaves of two turnip seedlings increased gradually,while the increase of B1 was smaller.Under drought stress,the contents of Pro and SS in the leaves of B1 and B2 germplasm seedlings increased gradually,the content of reducing sugar increased first and then decreased,the content of SP in B1 germplasm increased first and then decreased,and B2 increased gradually.The activities of SOD and POD in leaves of B1 and B2 germplasm seedlings were in direct proportion to the degree of drought stress,with the maximum value of CAT in B1 under severe drought stress and the maximum value of CAT in B2 under mild drought stress.The contents of total phenols and flavonoids in leaves of B1 and B2 germplasm seedlings increased gradually.The anthocyanin content of B1 increased gradually,while B2 increased first and then decreased.And the change range of B2 indexes in each treatment was larger than that of B1.With the increase of drought degree,IAA,ABA and ZR increased first and then decreased,while GA3 decreased gradually,and the contents of IAA,ZR and GA3 in B1 were lower than those in B2.After rehydration,the contents of all physiological indexes recovered except POD of B2.To sum up,drought and rehydration have different effects on the physiological characteristics of leaves of different drought-resistant turnip germplasms.Under drought stress,drought-resistant germplasm is less affected and shows stronger drought adaptability and resilience.关键词
芜菁幼苗/干旱胁迫/复水/生理特性Key words
Turnip seedlings/Drought stress/Rehydration/Physiological characteristics分类
农业科技引用本文复制引用
何苗,姜元昊,闵昊哲,林涛,王铎,轩正英..不同抗旱型芜菁幼苗对干旱胁迫及复水的生理响应差异[J].河南农业科学,2025,54(2):116-123,8.基金项目
塔里木大学校长基金一般项目(TDZKYB202301) （TDZKYB202301）
塔里木大学自然科学类创新研究团队项目(TDZKCX202407) （TDZKCX202407）
塔里木大学研究生科研创新项目(TDGRI202332) （TDGRI202332）
