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This article in CS

  1. Vol. 35 No. 4, p. 1094-1099
     
    Received: Sept 2, 1994


    * Corresponding author(s): jlynch@psupen.psu.edu
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doi:10.2135/cropsci1995.0011183X003500040029x

Genetic Variation for Phosphorus Efficiency of Common Bean in Contrasting Soil Types: II. Yield Response

  1. Xiaolong Yan,
  2. Stephen E. Beebe and
  3. Jonathan P. Lynch 
  1. L ab. of Plant Nutrition, South China Agricultural Univ., Guangzhou 510642, China
    B ean Program, Int. Center for Tropical Agriculture (CIAT), A.A. 6713, Cali, Colombia
    D ep. of Horticulture, The Pennsylvania State Univ., University Park, PA, 16802

Abstract

Abstract

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.

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Copyright © 1995. Crop Science Society of America, Inc.Copyright © 1995 by the Crop Science Society of America, Inc.