摘要
为研究花生幼苗对干旱胁迫的响应机制,以商花5号为试验材料,采用盆栽的方式研究不同强度的干旱胁迫(土壤相对含水量75%、55%、40%、25%)对花生幼苗光合色素含量、叶绿素荧光参数及根系活力的影响。结果表明:在轻度干旱(土壤相对含水量55%)胁迫下,花生幼苗叶绿素a、叶绿素b、叶绿素a+b和类胡萝卜素含量均与对照适宜墒情(土壤相对含水量75%)差异不显著(P>0.05),但在中度干旱(土壤相对含水量40%)和重度干旱(土壤相对含水量25%)胁迫下上述指标均显著降低。随着干旱胁迫强度的增加,花生叶片初始荧光(Fo)呈现逐渐升高的变化趋势,而最大荧光(Fm)、最大光化学效率(Fv/Fm)和光化学猝灭系数(qP)呈现逐渐降低的变化规律。轻度干旱胁迫对花生幼苗根系活力影响不显著(P>0.05),而中度和重度干旱胁迫能够显著降低花生幼苗根系活力(P<0.05)。
In order to study the response mechanism of peanut seedlings to drought stress,taking Shanghua No.5 as the experimental material,this paper studied the effects of different intensities of drought stress(75%,55%,40%,25%of soil relative water content)on photosynthetic pigment content,chlorophyll fluorescence parameter and root activity of peanut seedlings by pot culture.The results showed that under mild drought stress(55%of soil relative water content),the contents of chlorophyll a,chlorophyll b,chlorophyll a+b and carotenoid in peanut seedlings were not significantly different from the control(suitable soil moisture content,75%of soil relative water content)(P>0.05),but the above indicators were significantly reduced under moderate drought stress(40%of soil relative water content)and severe drought stress(25%of soil relative water content).With the increase of drought stress intensity,the initial fluorescence(Fo)of peanut leaves gradually increased,while the maximum fluorescence(Fm),maximum photochemical efficiency(Fv/Fm)and photochemical death coefficient(qP)showed a gradually decreasing trend.Mild drought stress had no significant effect on the root of peanut seedlings(P>0.05),while moderate and severe drought stress could significantly(P<0.05)reduce the root activity of peanut seedlings.
作者
韩同进
吴继华
HAN Tongjin;WU Jihua(Shangqiu Academy of Agricultural and Forestry Sciences,Shangqiu Henan 476000)
出处
《现代农业科技》
2023年第9期4-6,共3页
Modern Agricultural Science and Technology
基金
河南省花生产业技术体系专项(S2012-05-G01)
河南省科技攻关计划项目(202102110179)。
关键词
花生
干旱胁迫
光合色素含量
叶绿素荧光参数
根系活力
peanut
droughtstress
photosyntheticpigmentcontents
chlorophyllfluorescenceparameter
rootactivity
