A geographical approach to identify phosphorus-efficient genotypes among landraces and wild ancestors of common bean |
| |
Authors: | Stephen Beebe Jonathan Lynch Nicholas Galwey Joseph Tohme Ivan Ochoa |
| |
Institution: | (1) Centro Internacional de Agricultura Tropical (CIAT), A.A. 6713 Cali, Colombia;(2) Department of Horticulture, The Pennsylvania State University, University Park, PA, 16802, U.S.A;(3) Cenipalma, A.A. 42555 Santafe de Bogota, Colombia |
| |
Abstract: | Cultivars of common bean (Phaseolus vulgaris L.) capable of yielding well at low levels of native or added phosphorus (P)
are highly desirable in many tropical production systems. The objective of the present study was to identify geographical
regions which might be sources of such genotypes. A total of 364 landraces, cultivars and wild genotypes, drawn from a broad
geographic range, were divided on the basis of growth habit into four field trials, each comprising two levels of P, stressed
and unstressed, on an infertile Andosol in Popayan, Colombia. The regression relationship between grain yield per plant in
the presence and in the absence of stress was determined, and each genotype's deviation from this relationship was used as
a measure of P-efficiency. There was highly significant variation in efficiency among genotypes in all growth habits, and
in climbing beans there were consistent regional differences, superior genotypes being identified with greater frequency among
those from Bolivia, West Mexico and South Mexico-West Guatemala. The latter region was promising for prostrate bush genotypes
also. Wild beans in general performed relatively poorly; it appears that P-efficiency traits in P. vulgaris have been acquired
during or after domestication. These results confirm that genetic differences in P-efficiency exist among common bean genotypes
and suggest that these are related to geographic origin. Furthermore, the use of a representative sample of germplasm can
help to identify segments of the gene bank that are especially promising as sources of desirable traits.
This revised version was published online in July 2006 with corrections to the Cover Date. |
| |
Keywords: | common bean genetic resources Phaseolus vulgaris phosphorus nutrition plant adaptation stress tolerance variation |
本文献已被 SpringerLink 等数据库收录! |
|