广东水稻品种对不同白叶枯病菌株的抗性反应

测定了46个水稻品种对60个菌株的抗性反应,可以将这些品种区分为Ⅰ、广谱性抗病,Ⅱ、非广谱性抗病及Ⅲ、无抗性等三种类型。Ⅰ类型品种大多数是外引品种及其杂交衍生品种(系)。Ⅱ类型品种中只有少数具有较好的抗性,大多数都是中等抗病与中等感染的。Ⅲ类型品种都是偏于感病的,但丰产性状较好。为育成更多的抗病新品种,我们认为选择具有广谱抗性的品种作为亲本与高产品种进行组配,另外选择1—2个强菌株作为抗源筛选或杂交组合子代的抗性鉴定菌株,以获得满意的结果。

ON THE RICE VARIETAL RESISTANCE TO XANTHOMONAS ORYZAE IN GUANGDONG

Sixty isolates of different virulence were inoculated on 46 selected rice varieties with varying degrees of disease reaction.Results showed that the varietal resistance of rice to the leaf blight bacteria may generally be grouped into three categories,namely(1)Broad spectrum,(2)non-broad spectrum,and(3)no resistance.Most of the foreign introduced cultivars or highbrids belonged to the first group.They wermoderate resistant or moderate susceptible.The varieties "Zhai-Ye-Qing No.8","Foo-Bao-Ai No.22","Zao-Jin-Fung No.5","Qiu-Er-Ai","Teng-Pu-Ai","Tetep" and "Zenith" belonged to the second group,while the highly yielding varieties such as"IR8","Zhen-Zhu-Ai","Quang-Liu-Ai No.4" and "Jing-Gong No.30" belonged to the third group.To improve the breeding program for bacterial leaf blight resistance,the promised results will be obtained by using broad spectrum resistant varieties for source of resistance and strong virulent strains of the leaf blight bacteria for resistance tests.