Interaction between drought and chronic high temperature during kernel filling in wheat in a controlled environment
Interaction between drought and chronic high temperature during kernel filling in wheat in a controlled environment
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DOI：
10.1093/aob/mcf219
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发表时间：
2002-10-01
期刊：
影响因子：
4.2
通讯作者：
Wardlaw, IF
中科院分区：
文献类型：
--
作者：
Wardlaw, IF
小麦（Tritician aestivian L.）'Lyopur'），限制于单个秆，在18/13 ℃（中等温度）的白天/夜间温度下生长。或27/22摄氏度（慢性高温）前的时间开花。植物或者是非干旱的，或者是通过从在不同体积的盆栽混合物中生长的植物中扣留水来经受两次开花后水胁迫。在选定的植物同化物的需求，穗减少了所有，但五个中央小穗去除。在非干旱植物中，已证实开花后遮光（源限制）降低了成熟时的籽粒干重，当籽粒总数减少时（小库），剩余籽粒中的干重增加。减少籽粒数并没有改变高温开花后的剩余籽粒的干重在成熟时的效果，但减少籽粒数确实导致了更大的干重的干旱植物的剩余籽粒，然而，响应干旱和籽粒数之间的关系被混淆的程度减少水分胁迫与籽粒去除。在具有完全补充或减少数量的籽粒的植物成熟时，并且在开花后经受低温和高温的水分胁迫油籽粒干重的影响的数据。表明，在高温下，干旱对籽粒干重的影响在绝对值和相对值上都可能降低，而不是增强。有人建议，高温和干旱同时发生在开花后，可能有一定程度的干旱逃逸与慢性高温，由于减少籽粒灌浆的持续时间。尽管高温可提高水的使用率。(C)2002年《植物学年鉴》（Annals of Botany Company）
Wheat plants (Tritician aestivian L. 'Lyalipur'), limited to a single culm, were grown at day/night temperatures of either 18/13 degreesC (moderate temperature). or 27/22 degreesC (chronic high temperature) front the time of anthesis. Plants were either non-droughted or subjected to two post-anthesis water stresses by withholding water from plants grown in different volumes of potting mix. In selected plants the demand for assimilates by the ear was reduced by removal of all but the five central spikelets. In non-droughted plants, it was confirmed that shading following anthesis (source limitation) reduced kernel dry weight at maturity, with a compensating increase in the dry "eight of the remaining kernels when the total number of kernels was reduced (small sink). Reducing kernel number did not alter the effect of high temperature following anthesis on the dry weight of the remaining kernels at maturity, but reducing the number of kernels did result in a greater dry weight of the remaining kernels of droughted plants, However, the relationship between the response to drought and kernel number was confounded by a reduction in the extent of water stress associated with kernel removal. Data on the effect of water stress oil kernel dry weight at maturity of plants with either the full complement or reduced numbers of kernels, and subjected to low and high temperatures following anthesis. indicate that the effect of drought on kernel dry weight may be reduced, in both absolute and relative terms, rather than enhanced, at high temperature. It is suggested that where high temperature and drought occur concurrently after anthesis there may be a degree of drought escape associated with chronic high temperature due to the reduction in the duration of kernel filling. even though the rate of water use may be enhanced by high temperature. (C) 2002 Annals of Botany Company.