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Genetic Variation for Phosphorus Efficiency of Common Bean in Contrasting Soil Types: II. Yield Response
Author(s) -
Yan Xiaolong,
Beebe Stephen E.,
Lynch Jonathan P.
Publication year - 1995
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/cropsci1995.0011183x003500040029x
Subject(s) - biology , germplasm , agronomy , phaseolus , dry matter , phosphorus , soil fertility , soil water , horticulture , ecology , metallurgy , materials science
Phosphorus deficiency is a primary constraint to common bean ( Phaseolus vulgaris L.) production in the tropics. Bean genotypes differ in their P efficiency, defined as growth and yield in low P soil. The objectives of this study were to evaluate genetic variation in diverse bean germplasm for P efficiency in soil types with contrasting P chemistry and to assess possible relationships between dry matter distribution, P partitioning, and yield. Experiments were conducted at two sites in Colombia, one an Andosol in which P availability is limited by allophane and recalcitrant organic matter and the other an Ultisol in which P availability is limited by Fe and AI oxides, with three levels of P fertilization. Twelve contrasting genotypes were evaluated for yield components, harvest index, and P partitioning. Genotypes yielded differently under P stress. Andean germplasm was often higher yielding under P stress than Mesoamerican germplasm but less responsive to added P fertility. Genotypic rankings for P efficiency did not differ in the two soil types. Reproductive parameters such as harvest index, yield components, and P allocation among plant parts at maturity were not related to P efficiency. We conclude that (i) there is no evidence for specific adaptation to low P availability in volcanic or mineral soils in beans; (ii) Mesoamerican and Andean genotypes respond differently to P availability; and (iii) vegetative and reproductive responses to low P availability are not always correlated. Further studies of P acquisition mechanisms related to root traits and efficiency of P use are warranted.