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Recurrent Selection for Shifting Gene Frequency of Seed Weight in Panicum antidotale Retz. 1
Author(s) -
Wright L. Neal
Publication year - 1976
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1976.0011183x001600050012x
Subject(s) - biology , panicum , selection (genetic algorithm) , agronomy , dry weight , zoology , botany , veterinary medicine , horticulture , artificial intelligence , computer science , medicine
Effectiveness of recurrent phenotypic selection with restricted intercrossing by random mating through succeeding cycles to isolate genotypes of heavy and light seed weight of blue panicgrass, Panicum antidotale Retz., was investigated. Increased frequency of desired genotypes and isolation of separate genepools for extremes of seed weight were effected. Most effective estimate of selection intensity was calculated as the difference between mean of resource populations and mean of sample populations. Frequency of resource populations showed trimodal distribution. Bimodal frequency distributions were found for first four cycles of sample populations of light seed weight. Monodal frequency distributions were found for sample populations of heavy seed weight. Sixth cycle frequency distributions showed that sample populations of heavy and light seed weight were separated. Findings suggested that the biological limit was approximately 38.0 mg/100 seed for light seed weight and 135.0 mg/100 seed for heavy seed weight of plants selected from the resource populations investigated.