20份马铃薯材料的抗旱性评价与筛选

Evaluation and Screening of 20 Potato Materials for Drought Resistance

干旱是马铃薯生长发育的主要限制因子之一。为筛选出抗旱性强的马铃薯材料,在常规灌溉与干旱胁迫下,对20份参试马铃薯材料的单株产量、株高、SPAD值、丙二醛(Malondialdehyde,MDA)含量、离体叶片电导率和离体叶片失水力指标进行测定与分析,将各性状的抗旱系数作为衡量抗旱能力的指标,并结合主成分分析及模糊隶属函数法对各马铃薯材料进行抗旱性评价。各指标间均呈不同程度的相关,相关系数在-0.258~-0.958。主成分分析表明,两个主成分因子可涵盖20份马铃薯材料6个指标84.709%的数据信息。根据抗旱性度量值做聚类分析,当λ=10时,把20份马铃薯材料分为3个类群(抗旱性较强、抗旱性中等和抗旱性较弱材料),抗旱性较强的材料包括‘GMY129’‘GMY041’‘GMY155’‘GMY141’‘GMY139’‘GMY151’和‘GMY114’。该研究为马铃薯抗旱种质资源的筛选与评价提供理论参考。

Drought is one of the major limiting factors for potato growth and development.To select potato materials with high drought resistance,yield,plant height,SPAD value,malondialdehyde(MDA)content,detached leaf conductivity and detached leaf water loss capacity of 20 potato materials were measured and analyzed under regular irrigation and drought stress.The drought resistance coefficients of each trait were used as indicators of drought resistance,and the drought resistance of each potato material was evaluated by combining component analysis and fuzzy membership function method.All the indexes were correlated to some extents,with correlation coefficients ranging from-0.258 to-0.958.Principal component analysis showed that the two principal component factors covered 84.709%data information of six indicators of 20 potato materials.Cluster analysis withλ=10 divided the 20 potato materials into three groups(high drought resistance,medium drought resistance and low drought resistance)based on drought resistance measurement value.Materials with high drought resistance,including'GMY129','GMY041','GMY155','GMY141','GMY139','GMY151'and'GMY114',were selected.This study would provide a theoretical reference for thescreening and evaluation of drought-resistant germplasm resources of potato.