Final grain weight in wheat as affected by short periods of high temperature during pre- and post-anthesis under field conditions
Final grain weight in wheat as affected by short periods of high temperature during pre- and post-anthesis under field conditions
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DOI：
10.1071/pp99015
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发表时间：
1999-01-01
期刊：
影响因子：
--
通讯作者：
Slafer, GA
中科院分区：
文献类型：
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作者：
Calderini, DF;Abeledo, LG;Slafer, GA
单粒重是小麦产量变异的重要来源。本研究的目的是调查在田间条件下，花前或花后短期高温对籽粒重量的影响。因此，在四个不同的播种日期播种具有不同粒重潜力的两个小麦品种，以在花前和花后提供不同的温度条件。此外，对于两次播种，安装了丙烯酸箱，以在开花前或灌浆期的直线期提高穗部温度。最终粒重受播种日期、基因型和穗上粒位的显着影响。粒重与灌浆期平均温度存在明显的关系，但这种关系可以是线性的，也可以是曲线的，具体取决于品种。两种高温处理，即在花前或花后，都显着降低了最终粒重，并且除了较重的谷物外，它们的效果相似，这些谷物对花前的高温处理没有反应。最后，当将花期前的温度纳入粒重对温度的响应分析时，可以更好地了解最终粒重。
Individual grain weight is an important source of variation for grain yield in wheat. The aim of this study was to investigate the effect of short periods of high temperature immediately pre-anthesis, or during post-anthesis, on grain weight under field conditions. Thus, two wheat cultivars of different grain weight potential were sown on four different sowing dates to provide different temperature conditions during the pre- and post-anthesis periods. In addition, for two sowings, acrylic boxes were installed to increase spike temperature either immediately before anthesis, or during the lineal phase of the grain-filling period. Final grain weight was significantly affected by sowing date, genotype and grain position on the spike. Grain weight showed a clear relationship with the average temperature of the grain filling period, but this relationship was either linear or curvilinear, depending on the cultivar. Both high temperature treatments, i.e. at pre- or post-anthesis, significantly diminished final grain weight, and their effect was similar with the exception of heavier grains, which were unresponsive to the high temperature treatment at pre- anthesis. Finally, a better understanding of final grain weight was reached when temperatures from the pre- anthesis period were included in the analysis of grain weight response to temperature.