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<p>Phosphorus (P), an essential non-renewable resource, is indispensable for optimal growth and development of plants. Low P availability remains one of the major challenges in rice production systems therefore, identification of P-efficient rice genotypes is important for sustainable agriculture. Diverse rice genotypes (271) derived from the 3&#xa0;K Rice Genome Panel were screened in soil with low and sufficient P for two seasons under natural environmental conditions. The key traits contributing to genetic variability in rice identified by principal component analysis (PCA) using relative values, were flag leaf area, stomatal conductance, panicle weight, grain weight, total biomass, harvest index, grain P content and P harvest index (PHI) across both seasons. Besides these, shoot P content and straw biomass in the first season, and P use efficiency (PUE) in second season also contributed. Based on the top contributing traits, two optimal number of clusters were obtained by agglomerative hierarchical clustering for both the seasons. In the cluster 1 (P-inefficient) and cluster 2 (P-efficient), 158 and 21 genotypes, respectively were found common between both first and second seasons. The P-efficient genotypes IRIS_313-11454, IRIS_313-11456, IRIS_313-10876, IRIS_313-8305, and IRIS_313-9547 possessed highest mean values for grain yield, biomass, grain P content, and PUE while the P-inefficient genotypes, IRIS_313-10880, IRIS_313-10929, IRIS_313-9351, IRIS_313-11490, IRIS_313-10893, IRIS_313-11476, and IRIS_313-11822, exhibited lowest mean values under low P compared to sufficient P. The identified P-efficient rice genotypes can be utilized as donors or genetic stocks in the breeding programs to develop low P tolerant rice cultivars that can grow well in P deficient soils.</p>

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Phenotyping of diverse rice genotypes for low phosphorus stress tolerance under soil environment

  • 期刊论文

  • 发表日期：

    2025年6月3日

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  • Neha Anand,
  • Sandeep Sharma,
  • Monu Kumar,
  • Tarun Kumar,
  • Sanjay Kalia,
  • Renu Pandey

摘要

Phosphorus (P), an essential non-renewable resource, is indispensable for optimal growth and development of plants. Low P availability remains one of the major challenges in rice production systems therefore, identification of P-efficient rice genotypes is important for sustainable agriculture. Diverse rice genotypes (271) derived from the 3 K Rice Genome Panel were screened in soil with low and sufficient P for two seasons under natural environmental conditions. The key traits contributing to genetic variability in rice identified by principal component analysis (PCA) using relative values, were flag leaf area, stomatal conductance, panicle weight, grain weight, total biomass, harvest index, grain P content and P harvest index (PHI) across both seasons. Besides these, shoot P content and straw biomass in the first season, and P use efficiency (PUE) in second season also contributed. Based on the top contributing traits, two optimal number of clusters were obtained by agglomerative hierarchical clustering for both the seasons. In the cluster 1 (P-inefficient) and cluster 2 (P-efficient), 158 and 21 genotypes, respectively were found common between both first and second seasons. The P-efficient genotypes IRIS_313-11454, IRIS_313-11456, IRIS_313-10876, IRIS_313-8305, and IRIS_313-9547 possessed highest mean values for grain yield, biomass, grain P content, and PUE while the P-inefficient genotypes, IRIS_313-10880, IRIS_313-10929, IRIS_313-9351, IRIS_313-11490, IRIS_313-10893, IRIS_313-11476, and IRIS_313-11822, exhibited lowest mean values under low P compared to sufficient P. The identified P-efficient rice genotypes can be utilized as donors or genetic stocks in the breeding programs to develop low P tolerant rice cultivars that can grow well in P deficient soils.