Identification of High-Temperature-Responsive Genes in Cereals
Identification of High-Temperature-Responsive Genes in Cereals
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DOI：
10.1104/pp.111.192013
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发表时间：
2012-03-01
期刊：
影响因子：
7.4
通讯作者：
Trevaskis, Ben
中科院分区：
文献类型：
--
作者：
Hemming, Megan N.;Walford, Sally A.;Trevaskis, Ben
高温会影响植物的发育，并会降低作物产量。我们研究了环境温度对温带谷类作物小麦(Triticum Aestivum)和大麦(Hordeum Visgare)生殖发育的影响。高温在长日照下促进生殖发育，但在短日照下抑制生殖发育的早期阶段。通过PHOTOPERIOD1基因的日长敏感等位基因激活长日开花反应途径，导致开花基因T-like 1转录水平较高，不允许在短日内高温下快速早期生殖发育。此外，高温并没有增加开花基因T类基因的转录水平。这些数据表明，除了长日照反应途径外，其他基因或途径也参与了谷类作物对高温的发育反应。转录组分析表明，春化反应基因可能在高温下的发育反应中发挥作用。MADS-box花抑制基因HvODDSOC2在短日内高温条件下高水平表达，可能与抑制早期生殖发育有关。促开花基因FACTOR1、核糖核酸酶S基因和VER2基因也被鉴定为高温响应发育调节剂的候选基因。总体而言，这些数据表明，由于温度和日长之间的相互作用，气温上升可能会在不同纬度或一年中的不同时间引起不同的谷类作物发育反应。此外，我们认为与拟南芥相比，不同的发育调节剂可能介导了谷类植物对高温的反应。
High temperature influences plant development and can reduce crop yields. We examined how ambient temperature influences reproductive development in the temperate cereals wheat (Triticum aestivum) and barley (Hordeum vulgare). High temperature resulted in rapid progression through reproductive development in long days, but inhibited early stages of reproductive development in short days. Activation of the long-day flowering response pathway through day-lengthinsensitive alleles of the PHOTOPERIOD1 gene, which result in high FLOWERING LOCUS T-like1 transcript levels, did not allow rapid early reproductive development at high temperature in short days. Furthermore, high temperature did not increase transcript levels of FLOWERING LOCUS T-like genes. These data suggest that genes or pathways other than the longday response pathway mediate developmental responses to high temperature in cereals. Transcriptome analyses suggested a possible role for vernalization-responsive genes in the developmental response to high temperature. The MADS-box floral repressor HvODDSOC2 is expressed at elevated levels at high temperature in short days, and might contribute to the inhibition of early reproductive development under these conditions. FLOWERING PROMOTING FACTOR1-like, RNase-S-like genes, and VER2-like genes were also identified as candidates for high-temperature-responsive developmental regulators. Overall, these data suggest that rising temperatures might elicit different developmental responses in cereal crops at different latitudes or times of year, due to the interaction between temperature and day length. Additionally, we suggest that different developmental regulators might mediate the response to high temperature in cereals compared to Arabidopsis (Arabidopsis thaliana).