外源独脚金内酯对青海草地早熟禾根系生长的影响  

Effects of Exogenous Strigolactones on Root Growth of Poa Pratensis L.cv.Qinghai

作　　者：王君玲 刘颖 李林霞 WANG Junling;LIU Ying;LI Linxia(State Key Laboratory of Plateau Ecology and Agriculture,Qinghai Provincial Key Laboratory of Adaptive Management on Alpine·Grassland,Qinghai Academy of Animal and Veterinary Science,Qinghai University,Xining 810016,China;Key Laboratory of Superior Forage Germplasm in the Qinghai-Tibetan Plateau,Qinghai Academy of Animal and Veterinary Sciences,Qinghai Academy of Animal and Veterinary Science,Qinghai University,Xining 810016,China;Forage Technology Promotion Station Qinghai University of Qinghai Province,Xining 810016,China)

机构地区：[1]青海大学青海省畜牧兽医科学院青海省高寒草地适应性管理重点实验室,青海西宁810016 [2]青海大学青海省畜牧兽医科学院青海省青藏高原优良牧草种质资源利用重点实验室,青海西宁810016 [3]青海省饲草料技术推广站,青海西宁810016

出　　处：《高原科学研究》2024年第2期50-58,共9页Plateau Science Research

基　　金：国家自然科学基金项目(U21A20241).

摘　　要：独脚金内酯(SLs)是一种新型的植物激素,在调控植物的生长发育、刺激寄生性植物种子的萌发及介导植物在逆境胁迫中的适应性等方面具有重要的作用。为了明确独脚金内酯对植物根系生长的调控作用,文章以青海草地早熟禾为供试材料,用独脚金内酯类似物GR24代替独脚金内酯,采用随机区组试验设计,设置0 mol/L、0.1 mol/L、0.5 mol/L、1 mol/L 4个浓度梯度,6 d和12 d 2个处理周期,通过根系扫描仪对青海草地早熟禾根系生长状况进行研究。结果表明:(1)随着处理周期的延长,GR24显著提高了青海草地早熟禾的总根长、主根长、根表面积、根体积、根的平均直径和主根数,显著降低了其侧根长和侧根数,其中喷施12 d时,GR24对青海草地早熟禾根系有较好的促进作用。(2)同一周期,喷施0.1∼1 mol/L GR24对青海草地早熟禾根系的生长具有一定的促进作用,其中GR24的浓度为0.5 mol/L时,对其根部促生效果最好。该研究发现,施用0.5 mol/L的GR24溶液对青海草地早熟禾根部喷施12 d,对促进其根部生长具有良好的效果。Strigolactones(SLs)is a new type of plant hormones,and it plays an important role in regulating plant growth and development,stimulating seed germination of parasitic plants and mediating plant adaptability to stress.Poa pratensis L.cv.Qinghai was used as the study material with using strigolactones analogue GR24 instead of SLs to clarify its effect on the plant root growth by root scanner.A randomized block experiment design was applied with 4 concentration gradients of 0 mol/L,0.1 mol/L,0.5 mol/L,1 mol/L,and 2 treatment cycles of 6 d and 12 d.The results show that:(1)GR24 significantly increased the total root length,main root length,root surface area,root volume,mean diameter and the number of the main root,but significantly decreased the lateral root length and number of lateral root with the increase of treatment period.GR24 could promote the root growth of Poa Pratensis L.cv.Qinghai after spraying for 12 d.(2)In the same period,spraying 0.1~1 mol/L GR24 could promote the root growth of Poa Pratensis L.cv.Qinghai and the effect of GR24 on root growth was the best at concentrationof 0.5 mol/L.Therefore,this study concluded that the application of 0.5 mol/L GR24 solution to the roots of Poa pratensis L.cv.Qinghai for 12 d had a good effect on promoting its root growth.

关 键 词：独脚金内酯 青海草地早熟禾 GR24 根系生长 

分 类 号：S812.4[农业科学—草业科学]