Organ-specific allocation pattern of acquired phosphorus and dry matter in two rice genotypes with contrasting tolerance to phosphorus deficiency

DOI Web Site 4 Citations 33 References Open Access
  • D. M. S. B. Dissanayaka
    Graduate School of Biosphere Science, Hiroshima University, Higashi-Hiroshima, Japan
  • Sho Nishida
    Department of Applied Chemistry, Faculty of Science and Engineering, Chuo University, Tokyo, Japan
  • Keitaro Tawaraya
    Department of Food, Faculty of Agriculture, Life and Environmental Sciences, Yamagata University, Tsuruoka, Japan
  • Jun Wasaki
    Graduate School of Biosphere Science, Hiroshima University, Higashi-Hiroshima, Japan

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ABSTRACTOur earlier study demonstrated that the landrace of Japonica rice, Akamai exhibits low-P (phosphorous) tolerance mechanisms compared to the conventional type cultivar, Koshihikari. The present study examined the genotypic difference of yield, plasticity of root growth, and internal utilization of acquired P (allocation pattern of biomass and P among different vegetative and reproductive organs) of two contrasting cultivars in response to P-deficiency. Each cultivar was grown until maturity with (+P) and without (–P) P supply in pots (two plants per pot) filled with 15 kg of Regosol soil. Grain yield and yield components were determined along with biomass and P accumulation in different vegetative and reproductive organs. To assess the plasticity of root growth, the soil column in the pot was divided into two equal portions (upper and lower soil layers) in which the root dry weight and length were measured separately. Among the investigated yield components, the number of filled grains per panicle ...

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