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首页> 外文期刊>The Indian journal of genetics & plant breeding >Breeding for high yielding rice (Oryza sativa L.) varieties and hybrids adapted to aerobic (non-flooded, irrigated) conditions - I. Preliminary evaluation of a large number of improved germplasm lines.
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Breeding for high yielding rice (Oryza sativa L.) varieties and hybrids adapted to aerobic (non-flooded, irrigated) conditions - I. Preliminary evaluation of a large number of improved germplasm lines.

机译：适应有氧（无水，灌溉）条件的高产水稻（Oryza sativa L.）品种和杂交种的选育-I.大量改良种质系的初步评估。

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摘要

During wet season 2003, over 2600 improved germplasm lines, including 600 drought tolerant introgression lines, 800 indica/tropical japonica derivatives and 800 hybrid rice (Oryza sativa L.) breeding materials were screened in a puddled field (clay soil) under non-flooded, irrigated (aerobic) conditions with Rasi and Vandana as check varieties. The checks, known for their water stress tolerance were planted at regular intervals (after every ten entries) to serve as controls. In both the checks, within as well as between the strips, there was no variation for days to heading, whereas a significant variation was found for grain yield character. Apart from visual selection, three different methods utilizing appropriate statistics were employed for identifying promising genotypes. Among the three methods studied, the bias due to overestimation of strip mean of the check variety (method 1) and identification of false positives by nearest-neighbor analysis (method 2) were eliminated by adopting standardized grid selection procedure (method 3). Further, it was found to be very consistent and effective and therefore a suitable method for employing in large breeding populations and/over wide range of environmental variations in the experimental field..
机译：在2003年雨季期间，在非水淹条件下的水田（粘土）中筛选了2600多个改良种质，包括600个耐旱渗种系，800个d /热带粳稻衍生物和800个杂交稻（Oryza sativa L.）育种材料。 ，以Rasi和Vandana为检查品种的灌溉（有氧）条件。定期（每十次输入一次）种植以其耐水胁迫性闻名的检查作为对照。在两个检查中，在条带之内和之间，在抽穗的几天中都没有变化，而发现谷物的产量特性有显着变化。除了视觉选择，还采用了三种利用适当统计数据的不同方法来鉴定有前途的基因型。在所研究的三种方法中，通过采用标准化的网格选择程序（方法3）消除了由于过高估计了支票品种的条带均值（方法1）和通过最近邻分析识别假阳性（方法2）而造成的偏差。此外，发现它是非常一致和有效的，因此是在实验领域中用于大量繁殖种群和/或在广泛的环境变化中使用的合适方法。

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