Frequency and fertility restoration efficiency of Rf3 and Rf4 genes in Indian rice

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• 作者：Jawahar Lal Katara ; Ram Lakhan Verma ; Debkanta Nayak ; Umakanta Ngangkham ; Soham Ray ; Hatanath Subudhi ; Lambodar Behera ; Sanghamitra Samantaray ; Ravi Nageswara Rao ; Onkar Nath Singh and Trilochan Mohapatra
• 刊名：Plant Breeding
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：136
• 期：1
• 页码：74-82
• 全文大小：847K
• ISSN：1439-0523

文摘

Identification of new parental lines is crucial for developing ecology-specific hybrids with ideal agronomic performance. We screened a total of 570 different ecology-specific Indian rice varieties for the presence of fertility restorer genes, Rf3 and Rf4 using tightly linked markers DRRM Rf3-10 and RM6100, respectively. Among these varieties, 13% carried Rf3Rf3/Rf4Rf4, 31% carried rf3rf3/rf4rf4, 6% carried Rf3Rf3/rf4rf4 and remaining 50% carried Rf4Rf4/rf3rf3 allelic combinations. A mini set of 40 varieties with variable allelic combinations of fertility restorer genes were testcrossed with WA and Kalinga-based CMS lines. All the 80 F₁s were evaluated for spikelet fertility and fertility restoration ability. Rf3Rf3/rf4rf4 genotypes mostly behaved as partial maintainers or partial restorers. In contrast, rf3rf3/Rf4Rf4 genotypes were partial or effective restorers. However, double dominant genotypes showed better fertility restoration than the genotypes containing Rf3 or Rf4 individually. Some of the genotypes showed unexpected restoration pattern implying occurrence of other fertility restorer(s) apart from Rf3 and Rf4. The perfect restorers and maintainers identified in this study can be directly used in hybrid rice breeding.