Seed vigour contributes to yield improvement in dry direct‐seeded rainfed lowland rice
Seed vigour contributes to yield improvement in dry direct‐seeded rainfed lowland rice
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种子活力有助于提高旱直播雨养低地水稻的产量
DOI：
10.1111/aab.12405
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发表时间：
2018
影响因子：
2.6
通讯作者：
Y. Kato
中科院分区：
文献类型：
--
作者：
K. Yamane;R. García;K. Imayoshi;R. C. Mabesa;N. Banayo;G. Vergara;A. Yamauchi;P. S. Sta. Cruz;Y. Kato
旱直播稻（DSR）种植在亚洲热带地区广泛推广，但干旱和养分缺乏胁迫往往导致干旱低地作物歉收。本研究的目的是剖析菲律宾干旱和缺磷条件下与作物建立和DSR早期活力相关的生理形态特征。研究发现，在土壤水分亏缺条件下，为DSR培育的新抗旱品种（Rc 348和Rc 192）比流行的灌溉水稻品种（Rc 222和Rc 10）具有更快的发芽和发芽生长，这是由于发芽种子从干燥土壤中快速获得水分。种子含水量和种子干重的减少之间有显着的相关性，种子干重的减少和芽伸长在两个控制和干旱胁迫处理在萌发阶段。在苗期，Rc 348在干旱条件下的根系生长往往比Rc 222和Rc 10更旺盛，根冠比更高。Rc 348在缺磷条件下的幼苗活力也高于Rc 222，这是由于其根系生长和磷吸收量较大。在目标干旱易发地点（在作物建立期间发生13天的干旱期），在干旱条件下生长的Rc 348和Rc 192的产量（4.0-4.1吨公顷）高于Rc 10的产量（3.0吨公顷）。这些结果表明，即使在土壤水分和养分有限的情况下，快速发芽和幼苗活力，快速根系锚定和巨大的养分吸收能力，将是干旱低地DSR的重要特征。
Dry direct‐seeded rice (DSR) cultivation is widely spreading in tropical Asia, but drought and nutrient deficiency stresses often cause crop failure in rainfed lowlands. The objective of this study was to dissect the physio‐morphological characteristics associated with crop establishment and early vigour of DSR under drought and P deficiency conditions in the Philippines. It was found that new drought‐resistant cultivars bred for DSR (Rc348 and Rc192) had faster germination and sprout growth than popular irrigated rice cultivars (Rc222 and Rc10) under soil water deficit due to rapid moisture acquisition by the germinating seeds from drying soils. There was a significant correlation between seed moisture content and the reduction in seed dry weight, and between reduction in seed dry weight and shoot elongation under both control and drought stress treatments at the germination stage. At the seedling stage, the root growth of Rc348 under drought tended to be more vigorous with its higher root‐to‐shoot ratio compared to Rc222 and Rc10. The seedling vigour of Rc348 under P deficiency was also greater than that of Rc222 due to its greater root growth and P uptake. The yields of Rc348 and Rc192 grown under rainfed condition at the target drought‐prone site where a dry spell of 13 days occurred during crop establishment were higher (4.0–4.1 t ha⁻¹) than the yield of Rc10 (3.0 t ha⁻¹). These results suggest that quick germination and seedling vigour with quick root anchorage and great nutrient uptake capacity, even with limitations of soil moisture and nutrients, would be important traits for DSR in rainfed lowlands.
泰国东北部移植和直播雨养低地水稻（Oryza sativa L.）谷物产量的基因型差异。
DOI：
--
发表时间：
2007
期刊：
Field Crops Res. 102
影响因子：
--
作者：
Hayashi;S.;Kamoshita;A.;Yamagishi;J.;Kotchasatit;A.;Jongdee;B.
通讯作者：
B.