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New PDF release: Advances in rice genetics

By D S Brar; B Hardy

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Kyukei 890 is a japonica-type line from Suweon 258/Tainung 67, whereas Nekken 2 is a japonica line with the S-5n gene, which was developed by Ikehashi and Araki (1986). We then produced the male sterile line ms-TML1 by using a cytoplasmic male sterile (CMS) line developed by Shinjo (1975). The CMS line had the cytoplasm of Chinsurah Boro II and the nucleus of the japonica line TML1. Japonica-indica hybrids THR1 and THR3 were developed by crossing ms-TML1 and indicas Habataki and Ukei 581, respectively.

However, heterosis levels in the F1s derived from the crosses of these parents showed low to intermediate heterosis for plant height, maturity, harvest index, and grain yield. In contrast, heterosis was high for LAI, root length, root weight, and number of tillers plant–1. 30*) when all F1s were used in the analysis (Table 1). 81 PR1A Bo A 913 A Zhangyu PR28127 PR2A SN62a IR58025 A E2-208 SN45b O-71 Toyosake E2-50 1xS-24 1xS-30 Fig. 2. Dendrogram of 15 parental lines used to develop 3-line hybrids based on 45 SSR marker variants.

Allelic studies between sodic-tolerant and susceptible restorers thus need to be carried out. To develop sodic-tolerant rice hybrids, apart from identifying sodic-tolerant restorers, conversion of male sterile lines in the background of sodictolerant varieties is being carried out. Govinda Raj K, Virmani SS. 1988. Genetics of fertility restoration of WA-type cytoplasmic male sterility in rice. Crop Sci. 28:787792. Virmani SS, Govinda Raj K, Casal C, Dalmacio RD, Aurin PA. 1986. Current knowledge of and outlook on cytoplasmic genetic male sterility and fertility and restoration in rice.

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Advances in rice genetics by D S Brar; B Hardy

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