小粒咖啡叶片解剖结构和综合抗旱性评价

摘要

以7个品种的小粒咖啡为供试材料,通过测定叶片厚度(LT)、角质层厚度(CT)、栅栏组织厚度(PT)、海绵组织厚度(ST)、气孔密度(SD)和叶片小脉密度(VD),并计算出叶片组织结构紧密度(MTR)、叶片组织结构疏松度(MLR)和气孔面积指数(SPI),分析其抗旱能力的差异,为小粒咖啡栽培和筛选抗旱性状提供理论依据.结果表明,所选9个抗旱性指标,品种间差异显著,运用主成分分析方法结果显示,PT和MTR载荷较高,是反映小粒咖啡抗旱性信息的主要因子,可以作为评价小粒咖啡抗旱性的主要指标.其中德热169、P7963和矮卡综合抗旱能力较强,CCCA24较弱,P2,德热296和铁毕卡居中.%Leaf anatomical characteristics of 7 Coffea arabica cultivars were investigated to reveal the drought-resistant strategies in Puer,Yunnan.The stomatal density (SD),leaf thickness (LT),cuticle thickness (CT),palisade mesophyll thickness (PT),spongy mesophyll thickness (ST) and vein density (VD),and calculated mesophyll structure tense ratio (MTR),mesophyll structure loosened ratio (MLR) and stomatal pore area index (SPI) were measured.Results showed that 9 leaf anatomical characteristics were significantly different among cultivars.PT and MTR could be effective indicators of drought resistance for C.arabica based on principal component analysis.Dere169,P7963 and Aika were the most drought-resistant cultivars,the remaining cultivars were more drought-resistant than CCCA24.