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首页> 外文期刊>Turkish Journal of Agriculture & Forestry >Genetic analysis of preharvest sprouting tolerance in bread wheat (Triticum aestivum L. emend. Thell.)
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Genetic analysis of preharvest sprouting tolerance in bread wheat (Triticum aestivum L. emend. Thell.)

机译：面包小麦（Triticum aestivum L. emend。Thell。）收获前发芽耐受性的遗传分析

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摘要

Rains during grain ripening in wheat (Triticum aestivum L.) can cause preharvest sprouting (PHS), which drastically affects the grain yield and the baking quality of flour. In the present study, to screen 7 cultivars and 4 lines of spring bread wheat for PHS, germination tests were conducted with seeds obtained from wet spikes harvested immediately after natural rainfall. Germination tests were carried out as 3 different treatments: 1) seeds immediately germinated after hand-threshing on sampling day (T1), 2) seeds germinated 1 week later after hand-threshing (T2), and 3) 10 intact spikes kept on paper under laboratory conditions at room temperature, hand threshed and then put to germinate 7 days later (T3). Red-grained cultivars Sagitario and Pandas, red-grained line F6 0314.76/Mrl, and white-grained cultivar Sunlin showed the higher PHS tolerance, while other wheat cultivars and lines were found to be susceptible to PHS under all treatment conditions. To evaluate the mode of inheritance and combining ability of PHS tolerance, a diallel cross was made between 3 white-grained (susceptible) and 2 red-grained wheat (resistant) cultivars. Analysis of variance for combining ability showed the predominance of an additive gene effect for PHS tolerance, as the variance of the general combining ability was higher than the specific combining ability for both percent germination and germination index. Pandas and Sagitario showed positive contributions toward increasing PHS tolerance in the F1 progenies. Results presented in this study will provide useful information for wheat breeders about PHS tolerance or dormancy level in commonly grown wheat cultivars in the Mediterranean region of Turkey, and help them in the development of white wheat cultivars with an inherently higher sprouting tolerance. Key words: Preharvest sprouting, germination index, diallel cross, genetic parameters, bread wheat, Mediterranean region
机译：小麦（Triticum aestivum L.）谷物成熟期间的降雨会导致收获前发芽（PHS），这会严重影响谷物的产量和面粉的烘烤质量。在本研究中，为了筛选7个栽培品种和4个系系的春小麦用于PHS，使用从自然降雨后立即收获的湿穗上获得的种子进行发芽测试。进行了3种不同的处理方法的发芽测试：1）种子在打样日（T1）脱粒后立即发芽; 2）种子在手动脱粒后1周后（T2）萌发; 3）保留了10个完整的穗在室温下的实验室条件下，用手脱粒，然后在7天后发芽（T3）。红粒品种Sagitario和Pandas，红粒F6 0314.76 / Mrl和白粒品种Sunlin表现出较高的PHS耐受性，而其他小麦品种和品系在所有处理条件下均易受PHS的影响。为了评估遗传模式和PHS耐性的结合能力，在3个白粒（敏感）和2个红粒小麦（抗性）品种之间进行了二倍杂交。结合能力的方差分析表明，对于PHS耐受性，加性基因效应占优势，因为总体结合能力的方差都高于发芽率和发芽指数的特定结合能力。熊猫和射手座对提高F1后代对PHS的耐受性显示出积极的作用。这项研究提供的结果将为小麦育种者提供有关土耳其地中海地区常见种植的小麦品种的PHS耐受性或休眠水平的有用信息，并帮助他们发展具有更高发芽耐受性的白色小麦品种。关键词：收获前发芽，发芽指数，二叉杂交，遗传参数，面包小麦，地中海地区

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