Genetic Variation and Covariation in Hybrids of New Restorer and Cytoplasmic Male Sterile Lines of Sorghum, Sorghum Bicolor, (L.) Moench, from the World Collection PDF Download

Author: R. de P. NUNES
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ISBN:
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Languages : en
Pages : 126

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Book Description
Genetic varation was investigated among 16 new restorer lines (R-lines) selected from the World Sorghum Collection, and one chemically induced mutant and its normal sib, used as male parents, and 14 newly developed cytoplasmic male sterile lines (A-lines) and four standard commercial A-lines, used as female parents. The 18 R-lines were divide in two groups. The 16 lines from the World Sorghum Colletion were first randomly subdivided into two groups of eight. The two ramaining R-lines were added to each of the two groups of eight so that each of the two groups of males was composed of 10 lines. The eight new R-lines were referred to as random males because they were regarded as a random sample from a much larger number of phenotypically desirable R-lines that could be identified in the World Sorghum Collection. The induced mutant and its normal sib were called fixed males. Similarly, the 14 new A-lines were divided at random into two groups of seven. The four standard male sterile lines were added to each of the groups so that both groups of females had 11 lines. The 14 newly developed A-lines were called random females because they were regarded as a random sample from a much larger number of phenotypically desirable A-lines that could be developed from the World Sorghum Colletions. The four standard A-lines were called fixed females because they were deliberately closen. Each of the two groups of males was matched at random with one of the two groups of famales. As a result, two "AB" overall mating (...).