华南地区推广应用大豆品种对疫霉根腐病的抗性评价

Resistance evaluation of soybean varieties to phytophthora root rot in South China

【目的】评价华南地区大豆Glycine max(L.)Merrill品种(系)及其亲本对7个大豆疫霉菌Phytophthora sojae的抗性.【方法】采用下胚轴创伤接种法鉴定67个品种(系)及其亲本对7个不同毒力的大豆疫霉菌菌株的抗性.【结果和结论】67个品种对7个不同毒力菌株PGD1、Pm14、Pm28、PNJ1、PNJ3、PNJ4、P6497的侵染率不同,接种大豆疫霉菌PGD1的侵染率最高,PGD1是华南地区发现并分离的大豆疫霉菌新种,抗PGD1的品种有华夏6号、粤夏2011-4、桂春6号、桂春10号、桂夏1号、浙春3号,占鉴定品种的9%;其次是Pm28和Pm14,接种PNJ1和PNJ4的侵染率较低;另外,对7个大豆疫霉菌菌株都表现感病的品种有29个,占鉴定品种的43.3%.华南地区抗或多抗大豆疫霉根腐病的大豆品种较少,需要加强大豆品种抗病种质资源筛选和抗病育种研究.

【Objective】To systematically evaluate the resistance levels of soybean varieties to 7 strains of Phytophthora sojae in South China. 【Method】Sixty seven soybean extension cultivars and main parents were identified for the resistance to 7 strains of Phytophthora sojae using the hypocotyls inoculation technique. 【Result and conclusion】The infection rates of PGD1,Pm14,Pm28,PNJ1,PNJ3,PNJ4 and P6497 were 86. 6%,80. 6%,85. 1%,61. 2%,77. 6%,74. 6% and 80. 6% respectively,while9. 0% of the cultivars or lines were resistant to PGD1 strain which was newly found and isolated in Guangdong Province. Soybean varieties resistant to the Phytophthora strain PGD1 included Huaxia6,Yuexia2011-4,Guichun6,Guichun10,Guixia1 and Zhechun3. Among all tested species,twenty nine cultivars were susceptible to the 7 strains（ accounting for about 43. 3%）. There are few Phytophthora-re-sistant soybean varieties in South China. It is necessary to breed and extend resistant cultivars（ lines）.