摘要
探讨不同程度干旱胁迫对甜菜苗期生长状况的影响,旨在为耐旱甜菜种质选育与抗逆性研究提供理论依据。本研究以两种耐旱型BGRC16137(V_(1))、依安一号(V_(2))和两种干旱敏感型92011/1-6/1(V_(3))、7412/823-3(V_(4))的甜菜种质为材料,采用PEG模拟干旱,以差异显著性检验和逐步回归分析的方法来衡量干旱胁迫对甜菜的影响。随着干旱胁迫程度的增加,4个甜菜种质的幼苗地上部指标、地下部指标与叶片相对含水量都有显著的降低,根冠比逐渐升高。在各种浓度的干旱胁迫下,耐旱型V_(1)、V_(2)种质的叶鲜重、叶干重、叶饱和鲜重、根长和根鲜重的下降程度都低于旱敏感型V_(3)、V_(4)种质。重度干旱胁迫下,旱敏感型V_(3)、V_(4)种质的叶片相对含水量分别比对照组下降37.33%、43.90%,而耐旱型V_(1)、V_(2)种质仅下降14.94%、20.45%。结果表明耐旱型甜菜种质通过增加叶鲜重、叶干重、叶饱和鲜重、根长、根鲜重和叶片相对含水量来适应干旱胁迫。
In order to provide a theoretical basis for the selection of drought-tolerant sugar beet germplasm and the research on sugar beet stress tolerance,the effects of different levels of drought stress on the growth of sugar beet seedlings were discussed.In this study,two drought-tolerant types of BGRC16137(V_(1)) and Ian 1(V_(2)) and two drought-sensitive types 92011/1-6/1(V_(3)) and 7412/823-3(V_(4)) were used as materials,and drought was simulated with PEG and the effect of drought stress on sugar beet was studied by significance test of difference and stepwise regression analysis.As the degree of drought stress increased,the aboveground and underground indices of seedlings and the relative leaf water content of the four sugar beet germplasms all showed significant decrease,and the root-shoot ratio gradually increased.Under various concentrations of drought stress,the drought-tolerant V_(1) and V_(2) germplasms showed lower decrease in leaf fresh weight,leaf dry weight,leaf saturated fresh weight,root length and root fresh weight than the drought-sensitive V_(3) and V_(4) germplasms.Under severe drought stress,the relative leaf water content of the drought-sensitive V_(3) and V_(4) germplasms decreased by 37.33%and 43.90%,respectively,compared with that of the control,while the relative leaf water content of the drought-tolerant V_(1) and V_(2) germplasms only decreased by 14.94%and 20.45%,respectively.The results suggested that the drought-tolerant sugar beet germplasms can adapt to drought stress by increasing leaf fresh weight,leaf dry weight,leaf saturated fresh weight,root length,root fresh weight and the relative leaf water content.
作者
石杨
尹希龙
李王胜
兴旺
SHI Yang;YIN Xilong;LI Wangsheng;XING Wang(National Beet Medium-term Gene Bank/Heilongjiang University,Harbin 150080;Key Laboratory of Sugar Beet Genetics and Breeding/College of Advanced Agriculture and Ecological Environment,Heilongjiang University,Harbin 150080)
出处
《中国农学通报》
2022年第29期45-51,共7页
Chinese Agricultural Science Bulletin
基金
国家作物种质资源库“甜菜分库运行服务”(NCGRC-2021-017)
农业农村部“甜菜种质资源的收集、鉴定、编目、繁种与入库(圃)保存”(19210157)
农业农村部“普查收集甜菜种质资源鉴定评价与编目入库”(19210911)
农业农村部“甜菜种质资源安全保存”(19211031)
国家糖料产业技术体系项目“甜菜种质资源鉴定与新种质创制”(CARS-170102)。
关键词
甜菜
苗期
干旱胁迫
形态指标
响应机制
sugar beet
seedling
drought stress
morphological indices
response mechanisms
