茉莉酸对干旱胁迫下油用牡丹‘凤丹’光合特性的影响  

Effects of jasmonic acid on photosynthetic characteristics of Paeonia ostii ’Fengdan’ under drought stress

作　　者：魏祯祯 牛童非 郭丽丽[1] 侯小改[1] WEI Zhenzhen;NIU Tongfei;GUO Lili;HOU Xiaogai(College of Agriculture,Henan University of Science and Technology,Luoyang 471023,China)

机构地区：[1]河南科技大学农学院,洛阳471023

出　　处：《上海农业学报》2023年第1期9-13,共5页Acta Agriculturae Shanghai

基　　金：河南省优秀青年基金(202300410119);河南省高校科技创新人才支持计划(22HASTIT036)。

摘　　要：以3年生油用牡丹‘凤丹’实生苗为试验材料,采用盆栽控水法,研究不同浓度外源茉莉酸(JA)溶液对不同程度干旱胁迫下‘凤丹’叶片光合特性和叶绿素含量的影响。结果表明:随着干旱胁迫时间的延长,‘凤丹’叶片的净光合速率(P_(n))、气孔导度(G_(s))、蒸腾速率(T_(r))、胞间CO_(2)浓度(C_(i))均大幅下降,光合色素(叶绿素a、叶绿素b和类胡萝卜素)含量增加。当植株达到中度干旱胁迫时,与对照相比,100μmol∕L JA溶液处理的‘凤丹’叶片P_(n)、G_(s)、T_(r)和C_(i)分别提高了114.1%、367.7%、268.1%和16.93%;当植株达到重度干旱时,与对照相比,100μmol∕L JA溶液处理的‘凤丹’叶片P_(n)、G_(s)、T_(r)和C_(i)分别提高了93.7%、128.3%、144.4%和32.1%,叶绿素b和类胡萝卜素含量分别增加了20.4%和9.5%。可见,干旱胁迫对‘凤丹’实生苗的生长具有抑制作用,外源喷施100μmol∕L JA溶液可增强其对干旱胁迫的防御能力。Taking 3-year oil peony‘Fengdan’seedlings as experimental materials,the effects of different concentrations of exogenous jasmonic acid(JA) solution on the photosynthetic characteristics and chlorophyll content of‘Fengdan’leaves under different degrees of drought stress were studied by the method of potted water control.The results showed that with the extension of drought stress,the net photosynthetic rate(P_(n)),stomatal conductance(Gs),transpiration rate (T_(r)),and intercellular CO2concentration (C_(i)) of‘Fengdan’leaves significantly decreased,and photosynthetic pigments (chlorophyll a,chlorophyll b and carotenoids) content increased.When the plants reached moderate drought stress,compared with the control,P_(n),G_(s),TrandCiof‘Fengdan’leaves treated with 100μmol∕L JA solution increased by 114.1%,367.7%,268.1%and 16.93% respectively;When the plant reached severe drought,compared with the control,P_(n),G_(s),T_(r) and C_(i) of‘Fengdan’leaves treated with 100μmol∕L JA solution increased by 93.7%,128.3%,144.4% and 32.1%respectively,and the content of chlorophyll b and carotenoid increased by 20.4%and 9.5%respectively.It could be seen that drought stress has an inhibitory effect on the growth of‘Fengdan’seedlings,and exogenous spraying of100μmol∕L JA solution can enhance its defense ability against drought stress.

关 键 词：‘凤丹’ 干旱胁迫 茉莉酸 光合特性 

分 类 号：S685.11[农业科学—观赏园艺]