生态学杂志2025，Vol.44Issue(4)：1220-1225,6.DOI:10.13292/j.1000-4890.202504.011
腐植酸及D-精氨酸对干旱胁迫下谷子幼苗根系生长的影响
Effects of humic acid and D-arginine on root growth of foxtail millet(Setaria italica)seedlings under drought stress
摘要
Abstract
We examined the effects of humic acid(HA)and D-arginine(D-Arg)on root growth of foxtail millet seedlings of cultivars Jingu 21 and Zhangza 10 under drought stress.There were four treatments,including control(CK),drought stress(Dr),humic acid sprayed on the leaves under drought stress(Dr+HA),and humic acid and D-arginine sprayed on the leaves under drought stress(Dr+HA+D-Arg).We measured root growth,endoge-nous arginine(Arg)content,and arginine decarboxylase(ADC)activity of millet seedlings.The results showed that humic acid significantly increased the total root length,total root surface area,average root diameter,total root volume and root biomass under drought stress.Root dry biomass of Jingu 21 and Zhangza 10 was 40.41％and 55.57％higher than that of the Dr treatment,respectively(P＜0.05).Under the treatment of Dr+HA,root activi-ty,ADC activity,and endogenous Arg content were 18.58％,22.43％,31.71％(for Jingu 21),and 54.77％,18.71％,37.89％(for Zhangza 10)higher than those of the Dr treatment,respectively(P＜0.05).Humic acid sig-nificantly improved root activity,promoted the synthesis of endogenous Arg,and enhanced ADC activity,thereby promoting root growth and alleviating the damage caused by drought stress on root systems.The effect of D-Arg was opposite to that of humic acid,suggesting that humic acid could improve the drought resistance of millet by promo-ting the synthesis of polyamines.There were significant positive correlations among root morphological indices and between ADC activity and endogenous Arg content under humic acid treatment(P＜0.01).This study provides a new way to analyze the action mechanism of humic acid,which plays an important role in the application of humic acid in millet production and the development of green agriculture.关键词
腐植酸/D-精氨酸/谷子/根系/抗旱性Key words
humic acid/D-arginine/foxtail millet/root/drought resistance引用本文复制引用
申洁,宋小静,钟丹丹,秦成,裴鹏刚,王茜,雷海英,郝兴宇..腐植酸及D-精氨酸对干旱胁迫下谷子幼苗根系生长的影响[J].生态学杂志,2025,44(4):1220-1225,6.基金项目
黄土高原特色作物优质高效生产省部共建协同创新中心课题(SBGJXTZX-47)、山西省基础研究计划项目(202203021221235)和山西省高等学校人文社会科学重点研究基地项目(2022J030)资助. （SBGJXTZX-47）
