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By D S Brar; B Hardy

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Several methods, such as per se performance, combining ability, Mahalanobis’s generalized distance, and others, were employed using pedigree information, morphological traits, biochemical data, and DNA-based markers to study the genetic diversity among parents and heterosis (Melchinger 1997) and to select prospective parents. The results, however, have not been consistent. There are no recognized heterotic groups in rice. Therefore, the development of a method for choosing poten10 Advances in rice genetics tial parents before making all possible crosses and their field evaluation could improve the efficiency of hybrid breeding.

The biosaline concept: an approach to the utilization of underexploited resources. New York: Plenum. p 7779. Yeo AR, Flowers TJ. 1984. Mechanisms of salinity resistance in rice and their role as physiological criteria in plant breeding. In: Staples RC, Toenniessen GH, editors. Salinity tolerance in plant strategies for crop improvement. New York: John Wiley & Sons. p 151-170. Yeo AR, Yeo ME, Flowers SA, Flowers TJ. 1990. ) genotypes for physiological characters contributing to salinity resistance and their relationship to overall performance.

2), indicating the presence of substantial genetic variation in the parental cultivars that could be exploited to develop hybrids with a wide genetic base. 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.

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