Flowering response of rice to photoperiod and temperature: a QTL analysis using a phenological model
Flowering response of rice to photoperiod and temperature: a QTL analysis using a phenological model
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DOI：
10.1007/s00122-004-1905-4
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发表时间：
2005-02-01
影响因子：
5.4
通讯作者：
Nemoto, K
中科院分区：
文献类型：
--
作者：
Nakagawa, H;Yamagishi, J;Nemoto, K
在这项研究中，我们试图量化的热和光周期反应的水稻（Oryza sativa L.）。开花时间QTL联合的“种植日期”田间试验的作图群体，和“物候模型”分析，分别参数化的两个响应，基于每日温度，每日光周期和。花期为此目的，将“三阶段Beta模型”应用于在五个日期移植的“日本晴”דKasalath”回交近交系，该模型参数化了对温度的敏感性（参数α）、对光周期的敏感性（参数β）和在最佳条件下的早熟性（30 ℃下10小时光周期）（参数G）.在4个已知的水稻品种中检测到影响B值的QTL。开花时间QTL（Hd1、Hd2、Hd6和Hd8）区域，而G值QTL仅在Hd1和Hd2区域检测到。这一结果是一致的近等基因系（近等基因系）的Hd1，Hd2和Hd6，其中这些位点参与光周期敏感性，并在Hd1和Hd2赋予改变开花下10和14小时光周期，而Hd6的行动只受14小时光周期。Hd8首次被证明控制光周期敏感性。有趣的是，Hd1和Hd2与α值的QTL相关，这可能支持先前的假设，即光诱导过程取决于温度。这些结果表明，我们的方法可以有效地量化开花时间QTL的环境响应没有控制的环境或近等基因系。
In this study we have attempted to quantify the thermal and photoperiodical responses of rice ( Oryza sativa L.). flowering time QTLs jointly by a 'date-of-planting' field experiment of a mapping population, and a 'phenological model' analysis that separately parameterizes the two responses, based on daily temperature, daily photoperiod and. flowering date. For this purpose, the 'three- stage Beta model', which parameterizes the sensitivity to temperature (parameter alpha), the sensitivity to photoperiod (parameter beta), and earliness under optimal conditions (10 h photoperiod at 30 degrees C) (parameter G), was applied to 'Nipponbare' x 'Kasalath' backcross inbred lines that were transplanted on five dates. QTLs for the b value were detected in the four known. flowering time QTL (Hd1, Hd2, Hd6 and Hd8) regions, while QTLs for the G value were detected only in the Hd1 and Hd2 regions. This result was consistent with previous reports on near-isogenic lines (NILs)of Hd1, Hd2 and Hd6, where these loci were involved in photoperiod sensitivity, and where Hd1 and Hd2 conferred altered flowering under both 10 and 14 h photoperiods, while Hd6 action was only affected by the 14 h photoperiod. Hd8 was shown to control photoperiod sensitivity for the first time. Interestingly, Hd1 and Hd2 were associated with a QTL for the alpha value, which might support the previous hypothesis that the process of photoinduction depends on temperature. These results demonstrate that our approach can effectively quantify environmental responses of flowering time QTLs without controlled environments or NILs.