抗感稻曲病水稻品种的生殖期性状分析

为了分析稻曲病的发生与水稻品种生殖期性状的关系，选用6个不同抗性的水稻品种——‘农香21’、‘福丰优2号’、‘泸优313’、‘福两优366’、‘花2号3301’和‘浦江6号’为试验材料，在温室内分别测定了供试水稻品种生殖期的一些性状参数。结果表明，水稻品种对稻曲病的抗感性与水稻叶耳间距、孕穗期、抽穗期和防御酶（POD和SOD）活性无必然的联系，但与每穗谷粒数和穗型有一定关系。其中，抗病品种‘泸优313’的每穗谷粒数最少，为113．00粒，感病品种‘花2号3301’的每穗谷粒数最多，为242．67粒，此外，抗病品种的穗型较为松散，而感病品种的穗型较为密集。由此推测，水稻每穗谷粒数及其穗型有可能作为筛选抗病品种的指标之一。

Study on Breeding Period Characters of Resistant and Susceptible Rice Cultivars to False Smut of Rice

In order to analyze the relationship between breeding period characters of plants and susceptivity of rice cultivars against false smut, we used six rice cuhivars as materials, including ＇ Nongxiang 21＇, ＇ Fufengyou NO.2＇, ＇Luyou 313＇, ＇Fuliangyou 366＇, ＇Hua NO.2 3301＇ and ＇Pujiang NO.6＇, to test some breeding period characters of rice cuhivars in greenhouse. The results showed that there was no relationship between susceptivity of rice cuhivars to disease and auricle pace between sword leaf and next leaf, days of booting and heading period, and activities of defensive enzymes. But the susceptivity of rice cuhivars may be closely related with the number of gains per panicle and panicle types. The least number of gains per panicle （＇ Luyou 313＇, which was resistant cuhivar） were 113.00, the most number of gains per panicle （＇Hua NO.2 3301 ＇, which was susceptible cultivar） were 242.67. In addition, panicle types of resistant cuhivars were significant more loose than those of susceptible cuhivars. It was considered that the rice panicle type and its number of gains per panicle could become one of the indicators of resistant cuhivars screening.