【摘要】 以江西主栽品种‘赣兴48’、‘长林4号’和‘长林18号’的油茶实生苗为砧木，与相同品种的接穗嫁接，共得到9个不同的油茶砧穗组合。根据其后续愈合生长情况选择其中7个组合作为研究对象。通过使用不同胁迫处理的PEG-6000溶液模拟干旱胁迫，研究不同处理梯度对嫁接苗的生长情况、生理特性和叶片解剖结构的影响；通过主成分分析法、隶属函数分析法和聚类分析法对不同的油茶砧穗组合进行抗旱性综合评价，并确定关键抗旱性评价指标。结果表明：各砧穗组合的抗旱性由大到小依次为：赣兴48+长林4、赣兴48+长林18、长林4+长林4、长林18+赣兴48、长林18+长林18、长林4+长林18、长林4+赣兴48。且可将这7个砧穗组合分为3个类群，即抗旱型、中间型和不抗旱型。通过逐步回归分析知叶片紧实度、上表皮厚度、相对电导率、植物叶片中叶绿素相对含量（SPAD值），这4个指标可作为油茶砧穗组合抗旱性评价的重要指标。更多还原

【Abstract】 Taking seedlings of the main cultivars in Jiangxi Province,namely ’ Ganxing 48’,’Changlin 4’,and ’Changlin18’,as rootstocks,which were grafted with scions of the same varieties,a total of 9 different rootstock-scion combinations of Camellia oleifera were obtained.Based on their subsequent healing and growth conditions,7 combinations were selected as research objects.By using PEG-6000 solutions of different stress treatment to simulate drought stress,the effects of different treatment gradients on the growth,physiological characteristics,and leaf anatomical structure of grafted seedlings were studied.The drought resistance of different C.oleifera rootstock-scion combinations was comprehensively evaluated using principal component analysis,membership function analysis,and cluster analysis,and the key drought resistance evaluation indicators were determined.The results showed that the drought resistance of each rootstock-scion combination in descending order was:Ganxing 48+Changlin 4,Ganxing 48+Changlin 18,Changlin 4+Changlin 4,Changlin 18+Ganxing48,Changlin 18+Changlin 18,Changlin 4+Changlin 18,and Changlin 4+Ganxing 48.These 7 rootstock-scion combinations could be divided into 3 groups:droght-resistant type,intermediate type,and drought-sensitive type.Through stepwise regression analysis,it was found that four indicators,including leaf compactness,upper epidermis thickness,relative electrical conductivity,and relative chlorophyll content in plant leaves(SPAD value),could be used as important indicators for evaluating the drought resistance of Coleifera rootstock-scion combinations.更多还原