梨种质资源对腐烂病抗性的室内评价

采用离体枝条分生孢子悬浮液和菌丝块接种测定了11 种梨种质资源共211 份材料对腐烂病的抗性。结果显示：不同种质资源对病菌的侵入和扩展的抵抗均存在差异，抗侵入的占17.5%，抗扩展的占35.1%；同一种质资源对病菌侵入与扩展的抵抗之间也有差异，对病菌侵入和扩展抵抗一致的占30.3%，不一致的占69.7%；所有供试材料中对病菌侵入和扩展均为高抗（HR/HR）的占1.4%，抗病（R/R）的占4.7%，中等（M/M）的占12.3%，感病（S/S）的占10.9%，高感（HS/HS）的占0.9%；通过综合抗性评价发现，‘大香水’、‘杜梨’、‘江岛’、‘康德’、‘龙泉酥’、‘苹果梨’、‘山梨’、‘云红1 号’、‘早玉’和‘长十郎’为抗病（R/R）材料，‘新高’、‘武豆9 号’和‘荆杜3 号’为高抗（HR/HR）材料，‘新星’和‘新黄’为高感（HS/HS）材料。

Laboratory Evaluation for the Resistance of Pyrus Germplasm Accession to Valsa Canker

The resistance of a total of 211 samples of Pyrus germplasm accessions belonging to eleven species to Valsa canker were evaluated by inoculating detached shoots in the lab with conidial suspension and mycelia plugs of two strains of Valsa mali var. pyri. The results indicated that the difference between the disease auti-invasion（17.5%）and auti-expansion（35.1%）was significant among the examined germplasm accessions. The disease auti-invasion and auti-expansion of the same germplasm accession in response to the pathogen was significantly different，and the consistent resistance accounted for 30.3% while the inconsistent 69.7%. For all of the germplasm accessions，highly resistant（HR/HR）， resistant（R/R），moderately（M/M），susceptible（S/S），and highly susceptible（HS/HS）of the disease auti-invasion and auti-extension to the pathogen was 1.4%，4.7%，12.3%，10.9% and 0.9%，respectively. According to comprehensive evaluation for the resistance，it was considered that of Daxiangshui，Duli，Jiangdao，Le Counte，Longquansu，Pingguoli，Shanli，Yunhong-1，Zaoyu and Changshilang were resistant （R/R），that of Niitaka，Wudou-9 and Jingdu-3 were high resistant（HR/HR）and that of Xinxing and Xinhuang were high susceptible（HS/HS）.