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首页> 外文期刊>AoB PLANTS >Variation in tolerance of rice to long-term stagnant flooding that submerges most of the shoot will aid in breeding tolerant cultivars
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Variation in tolerance of rice to long-term stagnant flooding that submerges most of the shoot will aid in breeding tolerant cultivars

机译：水稻对大部分芽淹没的长期停滞洪水的耐受性变化将有助于育种耐性品种

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Stagnant flooding (SF) is a major problem in rainfed lowlands where floodwater of 25–50 cm stagnates in the field for most of the season. We aimed to establish a system for phenotyping SF tolerance and identifying tolerant germplasm through screening of landraces. A total of 626 rice accessions were evaluated over 3 years under control conditions and two levels of SF. Floodwater was raised to 20 cm at 25 or 30 days after transplanting (DAT). In one trial, the depth was increased subsequently by 5 cm a week and in another (severe stress), it was increased to 40 cm at 37 DAT and to 50 cm at 42 DAT. In both trials, water depth was maintained at 50–60 cm until maturity. In all cases, no plant was completely submerged. Plant height, elongation rate and yield were measured at maturity. Genotypes best suited to SF showed moderate elongation of 1.3–2.3 cm day?1 under SF. In contrast, semi-dwarf and fast-elongating types performed poorly. Subsequent trials using 18 genotypes, including six pairs of near isogenic lines (NILs) with or without SUB1 showed that all SUB1 NILs were sensitive to SF. Five of the other six genotypes contained SUB1 and were SF tolerant, suggesting the possibility of combining tolerances to complete submergence (SUB1) and SF. Stem starch and soluble sugar concentrations were similar under control conditions among the 18 genotypes, but starch was depleted by 37 % under SF, with less depletion in tolerant genotypes. SUB1 NILs contained similar concentrations of starch and sugars under SF. We conclude that survival and yield under SF are dependent on moderate elongation, high tillering, lesser carbohydrate depletion and higher fertility. The tolerant genotypes identified here performed strongly in both wet and dry seasons and will be used to identify tolerance mechanisms and alleles for use in marker-assisted breeding.
机译：在雨养低地中，停滞洪水（SF）是一个主要问题，在该季节的大部分时间里，田间都停滞着25-50 cm的洪水。我们的目标是建立一个系统的SF耐性表型和通过筛选地方品种鉴定耐性种质。在对照条件和两个SF水平下，在三年内评估了总计626份水稻。移植后25或30天，将洪水提高至20厘米（DAT）。在一项试验中，深度随后每周增加5 cm，而在另一项试验中（严重压力），深度在37 DAT时增加到40 cm，在42 DAT时增加到50 cm。在这两个试验中，直到成熟，水深都保持在50-60 cm。在所有情况下，没有植物被完全淹没。在成熟时测量植物高度，伸长率和产量。最适合SF的基因型在SF下表现出1.3–2.3 cm day ？1 的中等延伸。相反，半矮型和快伸长型表现较差。随后使用18种基因型进行的试验，包括六对带有或不带有SUB1的近等基因系（NIL），显示所有SUB1 NIL对SF敏感。其他六种基因型中的五种包含SUB1，并且具有SF耐受性，这表明可以将耐受性结合起来以完全淹没（SUB1）和SF。在18种基因型中，对照条件下的茎淀粉和可溶性糖浓度相似，但是在SF中，淀粉的消耗量减少了37％，而耐性基因型的消耗较少。在SF下，SUB1 NIL包含相似浓度的淀粉和糖。我们得出的结论是，SF下的存活率和产量取决于中等伸长率，高分till，较少的碳水化合物消耗和较高的生育力。此处鉴定的耐性基因型在干湿两季均表现出色，将用于鉴定耐性机制和等位基因，以用于标记辅助育种。

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