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Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

285 rice lines were used to screen resources and get both resistance to bacterial blight and bacterial leaf streak by artificial inoculation and molecular marker analysis in present study. The results indicated 9 and 7 lines were resistant to strong virulent V type strain of bacterial blight at resistant level and moderate level respectively. For JZ-8 strain of bacterial leaf streak, 2 lines were highly resistant, 31 lines were resistant, and 50 lines were moderately resistant. For LZ-4 strain of bacterial leaf streak, 16 lines were highly resistant, 68 lines were resistant, and 100 lines were moderately resistant. From all the 285 lines, 9 lines were resistant to bacterial blight and at least one of the strains of bacterial leaf streak above moderate resistance level. The 9 lines with resistance to both bacterial blight and bacterial leaf streak showed good yield-related agronomical traits. Two of these lines were found to carry xa5 that mediated resistance to both bacterial blight and bacterial leaf streak. Other seven of these lines were not found to cany xa5 that belong to another type of resistance. There was no significant correlation between the resistance of bacterial blight and bacterial leaf streak. There was highly significant correlation between the resistance of JZ-8 and LZ-4 of bacterial leaf streak. [ABSTRACT FROM AUTHOR]

The yield-related characters of 46 indica rice cultivars were analyzed in Nanning and Sanya to elucidate their changes in the process of off-season breeding in Hainan. The results indicated the value of plant height, flag leaf length and panicle length become smaller from Nanning to Sanya. While the value of setting rate, 1000-grain weight and yield per plant turned higher. The correlation among plant height, panicle length and yield per plant, and the correlation between panicle number and yield per plant were significantly or very significantly positive in both test points. The first principal component was regarded as yield factor, and the second and fifth principal component was regarded as panicle number factor or retting factor in both test points. The forth principal component was leaf width factor in Nanning, and was 1000-grain weight in Sanya. In addition, the breeder should pay more attention to the traits such as plant height, panicle length, panicle number and setting rate to use off-season breeding in Hainan for rice breeding. [ABSTRACT FROM AUTHOR]