热带农业科技TropicalAgriculturalScience&Technology2023,46(3):49-5342份橡胶树种质资源的耐寒性比较李小琴1,2,张凤良1,2*,吴裕1,2,毛常丽1,2,杨湉1,2,赵祺1,2(1.云南省热带作物科学研究所,云南景洪666100;2.西双版纳云垦澳洲坚果科技开发有限公司,云南景洪666100)摘要摘要:为筛选出耐寒性强的种质资源作为育种材料,以42份橡胶树魏克汉种质资源的一年生枝条为试材,按同一低温不同处理时长人工模拟低温寒害,测定相对电导率并结合半致死时间、树皮厚度对各种质耐寒性进行比较。结果表明:持续低温处理18h,相对电导率的均值已近50%,群体开始表现对低温的不耐受性;树皮厚度变幅较大,与半致死时间呈显著正相关;42份种质的半致死时间变幅为9.34~30.49h,聚类分析分为3大类,耐寒性最强的2份,最差的6份,总群体中耐寒性强的种质占比较少。在橡胶树大批量种质鉴定时,可选用同一低温下不同时长处理的方法来快速筛选耐寒性较强的种质。关键词关键词:橡胶树;种质资源;耐寒性;相对电导率中图分类号:S794.108文献标识码:A文章编号:1672-450X(2023)03-0049-05ComparisonofColdToleranceofComparisonofColdToleranceof4242HeveabrasiliensisHeveabrasiliensisGermplasmResourcesGermplasmResourcesLIXiaoqin1,2,ZHANGFengliang1,2*,WUYu1,2,MAOChangli1,2,YANGTian1,2,ZHAOQi1,21.YunnanInstituteofTropicalCrops,Jinghong666100,China;2.XishuangbannaYunkenMacadamia(integrifolia)Science&TechnologyDevelopmentCo.,Ltd.,Jinghong666100,ChinaAbstract:Abstract:Inordertoselectgermplasmresourceswithstrongcoldresistanceasbreedingmaterials,42annualbranchesofHeveaWeikehangermplasmresourceswereselectedastestmaterials.Underthesamelowtemperaturewithdifferentdura-tion,thechangeofrelativeconductivitywasmeasured,andthecoldtoleranceofgermplasmresourceswascomparedbycombiningthesemi-lethaltimeandbarkthickness.Theresultsshowedthatthemeanvalueoftherelativeconductivitywasnearly50%aftercontinuouslowtemperaturetreatmentfor18h,andthepopulationbegantoshowintolerancetolowtem-perature.Thebarkthicknesshadalargevariation,andwassignificantlypositivelycorrelatedwiththesemi-lethaltime.Thesemi-lethaltimeof42resourcesrangedfrom9.34hto30.49h.Clusteranalysisdividedthemintothreecategories...