Development of High Yielding Rice Varieties Tolerant to Phosphorus Deficiency

D. Kekulandara, L. Suriyagoda, P. C. G. Bandaranayake, D. Sirisena, N. S. Thilakarathne, W. Samarasinghe
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Abstract

Improvement of nutrient-use efficiency (NUE) in rice is important for increasing productivity. Rice varieties with tolerance to phosphorus (P) deficiency increase the productivity in P-deficient fields. Therefore, the objective of this study was to develop high yielding, P-deficiency tolerant rice varieties to enhance the NUE. High yielding and popular rice varieties (Bg300 and Bg94-1) and known P-deficiency tolerant rice varieties (H4 and At353) were used as female and male parents, respectively, in a crossing program. Single seed descent approach was used for rapid generation advancement. Bg300/At353 and Bg94-1/H4 crosses were advanced from F2 to F6 in planthouse condition under minimum fertigation for restricted growth. In F7 generation, 310 recombinant inbred lines (RIL) in both crosses were space-planted and 40 RILs were selected from each cross. Selected RILs were screened in a hydroponic system at 10 μM P level to select the best lines for P-deficiency tolerance. Multiple plant traits were used for selection and the most promising 20 rice lines were selected as the best performers under P-deficient hydroponic conditions. Marker assisted selection was carried out to confirm the presence of PSTOL1 gene. Selected rice lines were evaluated for agronomic traits and yield parameters. Ten promising rice lines were identified as high yielding lines with accepted agronomic traits.
培育耐缺磷的高产水稻品种
提高水稻的养分利用效率(NUE)对提高生产力非常重要。耐缺磷(P)的水稻品种可提高缺磷田块的产量。因此,本研究旨在培育高产、耐缺磷的水稻品种,以提高养分利用效率。在杂交计划中,高产、受欢迎的水稻品种(Bg300 和 Bg94-1)和已知的耐缺钾水稻品种(H4 和 At353)分别被用作雌性和雄性亲本。采用单种子后裔法进行快速世代交替。Bg300/At353和Bg94-1/H4杂交种在最小施肥条件下,从F2进化到F6,限制生长。在 F7 代,对两个杂交种中的 310 个重组近交系(RIL)进行空间种植,并从每个杂交种中筛选出 40 个 RIL。选出的 RIL 在 10 μM P 水平的水培系统中进行筛选,以选出耐 P 缺素的最佳品系。利用多种植物性状进行筛选,选出最有前途的 20 个水稻品系,作为缺磷水培条件下表现最好的品系。为确认 PSTOL1 基因的存在,进行了标记辅助选择。对选出的水稻品系进行了农艺性状和产量参数评估。确定了 10 个具有公认农艺性状的高产水稻品系。
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