五个抗源品种抗瘟鉴定及抗瘟遗传分析

Identification and Genetic Analysis of Rice Blast Resistance of 5 Resistant Varieties

１９９１～１９９４年鉴定了抗瘟抗源品种矮秆特特普（Ｔｅｔｅｐ）、赤块矮选、红脚占、梧农１号和谷农１３等的抗瘟性，抗小种率分别达１００．０％、７２．７３％、８１．８２％、８１．８２％和１００．０％；抗菌株率分别达９６．０１％、９５．２１％、９４．５２％、９４．５７％和９８．４６％；经全国和福建省稻瘟病圃鉴定，除梧农１号表现中抗外，其他４个抗源均高抗叶、穗瘟。抗瘟性遗传分析表明，矮秆特特普、赤块矮选、红脚占、梧农１号对中氏Ａ４９、中Ｂ１和中Ｂ１３三个小种表现有２对抗性显性基因控制，但梧农１号对中Ｃ１３生理小种仅表现１对抗性显性基因控制；赤块矮选分别与梧农１号、谷农１３杂交Ｆ２代，对中Ｂ１３和中Ｃ１３表现为３对抗性显性基因控制。

Rice blastresistant varieties,Dwarf Tetep,ChiKuaiai,Hongjiaozhan,Wunong N0. 1 and Gunong No. 13 were identified for their blast resistanec in 1990～1993.The resistant rates of these varieties to physiological races were 100.0%,72.73%,81 82%,8l.82%and 100.0%respective-ly,and to isolated strains were 96.01%,95.21%,94.52%,94.57%and 98.46%respective-ly。These 5 varieties were also undertaken the jiont identification in national and Fujian provincial uniform rice blast nursery.The results showed that,4 of them performed highly resistant to leaf and panicle blast,except Wunong No.1 which appeared middle resistant Genetic analysis showed that,the resistanec to physiological races ZA49,ZB1 and ZB13 of the varieties Dwarf Tetep,Chikuaiai and Wunong No.1 were governed by two pairs of dominant genes,while the variety Wunong No.1had only one dorninant gene of resistance to race ZC1.Segregation ratioes of three pairs of genes for the resistance to races ZB13 and ZC13 were detected in F2 populations of the crosses of Chikuaiai/Wunong No.1 and Chikuaiai/Gunong No.13,respectively.