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为了解四川省种植的部分小麦品种的抗旱性，比较了20%聚乙二醇（PEG-6000）胁迫后7个小麦品种（川麦42、绵阳15、绵阳11、川农19、矮抗58、周麦21、Sy95-71）萌发期和苗期抗旱指标的变化，并利用模糊数学隶属函数法计算各指标的隶属值，通过比较萌发期、苗期各指标隶属值的平均值大小来确定小麦品种抗旱性的强弱。结果表明，萌发期相对发芽率、根长、芽长与干旱胁迫呈负相关；在7个品种中，川麦42的相对发芽率和相对芽长最大（分别为87.63%和16.67%），Sy95-71的最小（分别为38.52%和4.38%）；绵阳11的相对根长最大（35.13%），Sy95-71的最小（18.85%）；利用隶属函数对这三个指标综合分析，7个小麦品种萌发期的抗旱性表现为川麦42>川农19>矮抗58>绵阳11>周麦21>绵阳15>Sy95-71。在苗期，相对含水量与胁迫程度呈负相关，在20% PEG-6000胁迫3 d后，Sy95-71的叶片相对含水量降幅最大（37.1%），川麦42降幅最小（25.3%）；丙二醛含量、超氧阴离子含量、过氧化氢含量、超氧化物歧化酶活性、过氧化氢酶活性、过氧化物酶活性与胁迫程度呈正相关，PEG-6000胁迫3 d后各指标均发生显著变化；利用隶属函数对这7个指标综合分析，7个小麦品种苗期的抗旱性表现为川麦42>矮抗58>川农19>周麦21>绵阳11>绵阳15>Sy95-71。在两个时期，根据旱害隶属函数值和综合排序值，川麦42抗旱性最强，Sy95-71抗旱性最弱。

英文摘要:

To understand the drought resistance of different wheat varieties from Sichuan province, we compared the changes of the drought resistance indexes in seven different wheat varieties (Chuanmai 42, Mianyang 15, Mianyang 11, Chuannong 19, Aikang 58, Zhoumai 21, Sy95-71) at germination and seedling stage under drought stress. The method of subordinate function analysis was used to calculate membership value of each index at germination and seedling stage. Then, the drought resistance was determined by comparing the average membership value. The results indicated that relative germination rate (RGR), shoot length and root length presented the negative correlation with drought stress at germination stage. Chuanmai 42 had the highest relative germination rate and relative shoot length (RSL). However, Sy95-71 presented the lowest relative germination rate, shoot length and root length. By subordinate function comprehensive analysis, we found that the drought resistance at germination was following:Chuanmai 42>Chuannong 19>Aikang 58>Mianyang 11>Zhoumai 21>Mianyang 15>Sy95-71. In addition, the relative water content (RWC) was negatively correlation with the stressed degree at seedling stage. However, malonadehyde (MDA), superoxide anion (O₂_-), hydrogen peroxide (H₂O₂), superoxide dismutase (SOD), catalase (CAT) and peroxidase (POD) presented positive correlation with the stressed degree at seedling stage. By comprehensive analysis of the subordinate function value under drought stress for 3 d, the drought resistance at seedling stage was following:Chuanmai 42>Aikang 58>Chuannong 19>Zhoumai 21>Mianyang 11>Mianyang 15>Sy95-71. Using subordinate function analysis at germination and seedling stage, the present study found that Chuanmai 42 and Sy95-71 had the strongest and lowest drought resistance, respectively.

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