小麦种质多酚氧化酶的遗传变异及抗穂发芽品种的筛选

为了研究中国小麦品种资源多酚氧化酶(PPO)活性的变异，并对部分主推小麦品种的抗穗发芽能力进行评价和筛选，选用195份小麦种质资源和24份主推小麦品种，采用籽粒法测定了其多酚氧化酶（PPO）的活性。结果表明，供试小麦资源PPO活性表现出较大的变异，变异范围为4.95~13.99 AU/(min?g)，变异系数为21.4%，表明小麦PPO活性遗传改良具有很大的潜力；我国主推小麦品种之间的PPO活性差异较大，筛选出‘中麦9’，‘京9428’，‘冀麦38’，‘陕229’，‘宁麦9’，‘川麦47’等PPO活性较低的品种，可以鉴定为抗穗发芽能力较强的品种。

Genetic Variation of Polyphenol Oxidase in Wheat and Screening of Wheat Varieties with Resistance to Pre-harvest Sprouting

In this paper,the activities of PPO in wheat were determined to reveal the variation of polyphenol oxidase （PPO） in 195 varieties of wheat and to evaluate and screen of the resistance of pre-harvest sprouting from 24 popular wheat varieties.The results indicated that significant variation was observed among PPO activities of wheat in China,ranging from 4.95 to 13.99 AU/（min·g） and the variation coefficient was 21.4%.There were great deviations of the PPO activities among studied wheat.It indicated that wheat genetic improvement has great potential.Finally,there were great deviations of the PPO activities among commercial wheat cultivars in China ,several resistance of pre-harvest sprouting wheat was selected,including ＇ Zhongmai 9 ＇ ,＇ Jing 9428 ＇ ,＇ Jimai 38 ＇ ,＇ Shan 229 ＇ ,＇ Ningmai 9 ＇ and ＇ Chuanmai 47 ＇ .