外源独脚金内酯对干旱胁迫下2种报春苣苔属植物生长及生理特性的影响  

Effects of exogenous strigolactones on growth and physiological characteristics of two Primulina species under drought stress

作　　者：常丹 黄焱辉 田敏[2] 蔡艳飞[2] 孟静[1] CHANG Dan;HUANG Yanhui;TIAN Min;CAI Yanfei;MENG Jing(College of Landscape and Horticulture,Yunnan Agricultural University,Kunming 650201,China;Flower Research Institute,Yunnan Academy of Agricultural Sciences,Kunming 650205,China)

机构地区：[1]云南农业大学园林园艺学院,昆明650201 [2]云南省农业科学院花卉研究所,昆明650205

出　　处：《应用生态学报》2025年第3期802-810,共9页Chinese Journal of Applied Ecology

基　　金：云南省野生动植物保护项目(2021SJ14X-06)资助。

摘　　要：为探究干旱胁迫下新型植物激素独脚金内酯(SLs)对报春苣苔属植物的缓解效应,本试验以2种报春苣苔为试验材料,以聚乙二醇6000(PEG-6000=20%)模拟干旱胁迫,研究干旱和外源喷施SLs类似物GR24(20μmol·L^(-1))对报春苣苔植物生长的影响。结果表明:在干旱胁迫下,喷施GR24有效缓解了冬花报春苣苔和龙氏报春苣苔叶片的萎蔫和黄化程度,促进了根系的生长,其中,冬花报春苣苔根系活力和新生根总长显著提高,分别增加了12.1%和26.2%;提高了2种报春苣苔的叶片光合作用能力,改善了干旱对报春苣苔光合的抑制作用,其中,冬花报春苣苔叶片总叶绿素含量、胞间CO_(2)浓度和净光合速率分别显著提升5.9%、1.5%和27.5%,龙氏报春苣苔的胞间CO_(2)浓度显著提升2.5%;显著提高了2种报春苣苔叶片和根系中的抗氧化酶活性,其中,冬花报春苣苔和龙氏报春苣苔叶片的超氧化物歧化酶、过氧化物酶、过氧化氢酶活性以及根系的超氧化物歧化酶、过氧化氢酶活性分别显著提高50.3%、22.3%、31.2%、67.7%、12.5%和51.2%、29.0%、11.1%、27.6%、18.2%;有效降低了植物细胞的过氧化程度,冬花报春苣苔和龙氏报春苣苔叶片中的丙二醛含量分别显著降低了10.0%和16.6%。总之,干旱胁迫可显著抑制报春苣苔属植株的生长,而外源喷施SLs可显著缓解干旱胁迫对报春苣苔属植物造成的伤害。To investigate the role of strigolactones(SLs)in alleviating the impacts of drought stress on Primulina,we examined the effects of drought and exogenous SLs analogue GR24(20μmol·L^(-1))on the growth of two Primulina species,P.hiemalis and P.longii,with PEG-6000(PEG-6000=20%)to simulate drought stress.The results showed that spraying GR24 effectively alleviated the wilting and yellowing degree of leaves in both species,and effectively promoted root growth.Root vitality and total length of new roots of P.hiemalis was significantly increased by 12.1% and 26.2%,respectively.Leaf photosynthetic capacity was improved,which effectively alleviated the inhibitory effect of drought on photosynthesis.The total chlorophyll content,intercellular CO_(2) concentration,and net photosynthetic rate of leaves of P.hiemalis were significantly increased by 5.9%,1.5%,and 27.5%,respectively,while the intercellular CO_(2) concentration of P.longii was significantly increased by 2.5%.The activity of antioxidant enzyme was significantly increased in the leaves and roots of both species,among which the activities of superoxide dismutase,peroxidase,and catalase in the leaves and the activities of superoxide dismutase and catalase in the roots of P.hiemalis and P.longii were significantly increased by 50.3%,22.3%,31.2%,67.7%,12.5%,and 51.2%,29.0%,11.1%,27.6%,18.2%,respectively.The degree of peroxidation was effectively reduced,and the content of malondialdehyde in leaves of P.hiemalis and P.longii was significantly reduced by 10.0% and 16.6%,respectively.In all,drought stress significantly inhibited the growth of Primulina,and the external application of SLs could significantly alleviate the damage of drought stress on Primulina plants.

关 键 词：报春苣苔 独脚金内酯 干旱胁迫 生理特性 

分 类 号：S68[农业科学—观赏园艺]