Number of crosses and population size for participatory and classical plant breeding

摘要: In the breeding of self-pollinating crops, crossing creates variation upon which selection is exerted. If value crosses cannot be predicted then this uncertainty means that many need to made. However, since there a limit capacity programme, more numerous result in each cross having small population size, fewer progenies later generations and lower probability recovering good genotypes from cross. Published theory on optimum number plant for predominantly crop, usually assumes all are equal value. This overestimates required. When size favourable considered, predicts very large populations desirable. The required even larger if linkage loci controlling different traits also considered. Hence, an inbreeding one possible strategy select considered produce them increase superior genotypes. out analogy few composites with sizes. low-cross-number ideally suited particular constraints advantages participatory breeding. Such approach, although not essential, may still advantageous classical programme based crosses, parents chosen crucial farmer methods highly effective narrowing choice. Modified bulk methods, recurrent desirable strategies crops when combined approach.