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作者	单位
张育哲，王博华，孙娜，程宇坤，王兆强，耿洪伟，任毅	（1.新疆农业大学农学院/新疆农业大学优质专用麦类作物工程技术研究中心，新疆乌鲁木齐 830052；2.伊犁州农业科学研究所，新疆伊宁 835000）

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中文摘要:

为明确不同小麦品种（系）苗期根系形态与抗旱性的关系,以20%聚乙二醇（PEG-6000）模拟干旱对300份国内外冬小麦品种（系）进行苗期抗旱性鉴定，测定了8个根系性状（根尖数、根体积、根表面积、根总长、根平均直径、最长根长、根干重和根鲜重），结合多元统计方法（相关性分析/隶属函数法/聚类分析/主成分分析）进行抗旱性综合评价。结果表明，与常规处理相比，干旱胁迫后各根系指标均极显著下降（P＜0.01），说明苗期干旱胁迫会对小麦根系生长发育产生抑制作用。供试小麦的抗旱综合评价D值为0.09~0.86。通过聚类分析将供试材料抗旱类型分为5类，内乡5号和皖23094为高抗旱型，豫麦49、皖麦38、C39等21份材料为抗旱型，济麦20、Mantol、扬麦10号等70份材料为中抗旱型，中麦895、淮麦18、RE714等114份材料为干旱敏感型，繁6、宁麦9号、Aca 801等93份材料为干旱高敏感型。比较不同麦区苗期抗旱类型分布频率发现，黄淮冬麦区可作为筛选抗旱优异种质的重点麦区。主成分分析表明，苗期抗旱性鉴定可参考根表面积、根体积、根鲜重和根平均直径。

英文摘要:

To clarify the relationship between root morphology at seedling stage and drought resistance characteristics of different wheat varieties(lines),this study simulated drought conditions using 20% polyethylene glycol(PEG-6000) to assess the drought resistance of 300 domestic and foreign winter wheat samples at the seedling stage. Eight root morphological indicators were determined: root tip number, root volume, root surface area, total root length, root average diameter, longest root length, root dry weight and root fresh weight, and a comprehensive evaluation of root traits was conducted using various statistical methods(correlation analysis, membership function method, cluster analysis, and principal component analysis). The results showed compared with the normal treatment, the measured indicators of wheat root under drought stress treatment decreased significantly(P<0.01). Indicating that drought stress at the seedling stage significantly inhibited the root growth of wheat. The comprehensive drought resistance evaluation D value for the tested wheat varieties was between 0.09 and 0.86. Cluster analysis categorized the tested materials into five types of drought resistance: Neixiang 5 and Wan 23094 were classified as highly drought-resistant, 21 samples including Yumai 49, Wanmai 38 and C39 were drought resistant type, 70 samples including Jimai 20, Mantol and Yangmai 10 were moderately drought resistant type, and 114 samples including Zhongmai 895, Huaimai 18 and RE714 were drought sensitive type, P3 samples including Fan 6, Ningmai 9 and Aca 801 were classified as highly drought sensitive. Comparing the distribution frequency of different drought resistance types across wheat growing regions revealed that the Huang-Huai winter wheat area is an important region for screening elite drought-resistant germplasm. Principal component analysis indicated that the assessment of seedling stage drought resistance refers to root surface area, root volume, root fresh weight and average root diameter. The results of this study may provide reference for the screening and utilization of drought-resistant germplasm in wheat.

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