Breeding for yield in dry bean (Phaseolus vulgaris L.) |
| |
Authors: | James D Kelly Judith M Kolkman Kristin Schneider |
| |
Institution: | (1) Crop and Soil Sciences, Michigan State University, East Lansing, MI, 48824, U.S.A |
| |
Abstract: | Strategies employed by dry bean breeders to improve yield include early generation testing, ideotype breeding, selection for
physiological efficiency, and selection based on genotypic performance and combining ability across gene pools of Phaseolus
vulgaris. Ideotype breeding has been successfully deployed to improve yield in navy, pinto and great northern seed types.
The ideotype method is based on an ideal plant architecture to which breeders target their selection. Breeding for physiological
efficiency is important in combining increased biomass, high growth rates and efficient partitioning. Genotypic performance
and combining ability are also critical for yield improvement, since crosses between gene pools can exhibit negative combining
ability and problems with lethality, whereas interracial crosses within the same gene pool exhibit the greatest potential.
Breeders must work within specific constraints for growth habit, maturity, seed quality and disease resistance. A three-tiered
pyramidal breeding strategy is proposed to facilitate yield improvement in dry bean. Breeding of elite, agronomically acceptable
germplasm within the same market class is restricted to the apex of the pyramid. The intermediate level has fewer constraints
and greater access to diverse germplasm. Interracial crosses within the same gene pool are utilized to exploit genetic differences
within adapted material. Extracting genetic diversity from unadapted sources, including wild germplasm and other Phaseolus
species, is conducted at the base of the pyramid. The objective of this breeding strategy is the movement of improved germplasm
towards the apex, using different breeding procedures to optimize improvement at each tier of the breeding pyramid.
This revised version was published online in July 2006 with corrections to the Cover Date. |
| |
Keywords: | breeding pyramid combining ability gene pools ideotype partitioning wild species |
本文献已被 SpringerLink 等数据库收录! |
|