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首页> 外文期刊>Plant Production Science >Agronomic Performance of F1 Hybrids of Rice (Oryza sativa L.) in Japonica-Indica Crosses : Heterosis for and relationship between grain yield and related characters
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Agronomic Performance of F1 Hybrids of Rice (Oryza sativa L.) in Japonica-Indica Crosses : Heterosis for and relationship between grain yield and related characters

机译：杂交粳稻F1代的农艺性状：杂种优势及产量与相关性状的关系。

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Generally F1 hybrids from crosses between japonica and indica rice show variable degrees of sterility. Previous studies revealed that among the indica rice, the Aus type has sexual affinity with japonica cultivars giving higher fertility in F1 hybrids. Therefore, we made an effort to obtain higher grain yield by producing F1 hybrids between japonica and Aus-type indica. A field experiment was conducted to investigate the heterosis in these F1 hybrids for dry matter accumulation, spikelet fertility, yield and yield attributes, to find cross combinations with higher grain yield, and examined the relationships of grain yield with some agronomic characters. F1 hybrids flowered earlier than their parent cultivars. Heterosis for dry matter accumulation was positive at the panicle initiation stage, at heading and at maturity. The average heterosis for number of panicles, grain and straw yield per plant, number of spikelets per panicle and 1000-grain weight was positive. A few F1 hybrids showed positive heterosis for number of filled grains per panicle, spikelet fertility and harvest index; but the average heterosis for these traits was negative. Among the yield components, a higher number of panicles per plant and higher number of spikelet per panicle contributed to higher grain yield in F1 hybrids. A significant and positive relationship existed between spikelet fertility and grain yield per plant. The higher grain yield was attributed to higher dry matter production rather than higher harvest index in F1 hybrids, although low spikelet fertility limited yield potential in some F1 hybrids.
机译：通常，来自粳稻和in稻杂交的F1杂种表现出不同程度的不育性。以前的研究表明，在rice稻中，Aus型与粳稻品种具有性亲和力，从而使F1杂种具有更高的生育力。因此，我们努力通过生产粳稻和澳大利亚型in稻之间的F1杂种来获得更高的谷物产量。进行了田间试验，研究了这些F1杂种的杂种优势，以了解其干物质积累，小穗育性，产量和产量属性，以发现具有较高谷物产量的交叉组合，并研究了谷物产量与某些农艺性状的关系。 F1杂种比其亲本品种早开花。在穗开始阶段，抽穗期和成熟期，干物质积累的杂种优势为阳性。穗数，单株籽粒和秸秆产量，每穗小穗数和1000粒重的平均杂种优势为正。一些F1杂种显示出每穗实粒数，小穗育性和收获指数的正杂种优势。但是这些特征的平均杂种优势为负。在产量构成部分中，每株植物更多的穗数和每穗的小穗数更多，导致F1杂种的籽粒产量更高。小穗育性与单株籽粒产量之间存在显着正相关关系。籽粒产量较高归因于F​​1杂种的较高干物质产量而不是较高的收获指数，尽管小穗的低生育力限制了某些F1杂种的产量潜力。

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