Wheat developmental traits as affected by the interaction between Eps-7D and temperature under contrasting photoperiods with insensitive Ppd-D1 background
Wheat developmental traits as affected by the interaction between Eps-7D and temperature under contrasting photoperiods with insensitive Ppd-D1 background
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不敏感 Ppd-D1 背景下对比光周期下 Eps-7D 与温度相互作用对小麦发育性状的影响
DOI：
10.1101/2020.09.10.290916
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发表时间：
2020
期刊：
影响因子：
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通讯作者：
Basavaraddi P
中科院分区：
文献类型：
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作者：
Basavaraddi P
早熟性本身(EPS)基因是微调适应的重要基因，研究其对小麦产量性状的多效性效应具有重要意义。此外，已有研究表明，一些EPS基因与温度相互作用。我们研究了三种温度条件(9℃、15℃和18℃)和两种光周期(12 h和24 h)下的两个近交系，它们与新鉴定的EPS-7D不同，但背景中携带不敏感的PPD-D1。EPS-7D对开花时间的影响与预期一致，EPS-7D延迟等位基因延长了顶生小穗前后的开花时间。EPS-7D×温度互作效应显著，但不能互换：近等位基因与晚、早等位基因间差异的大小和显著程度受生长温度的影响(18℃时差异最小，9℃时差异最大)，温度敏感性差异受光周期影响。EPS-7D-早的近等位基因叶片发生速度快于晚等位基因，补偿了较短的叶片起始持续时间，导致两个近等基因的最终叶片数相近。EPS-7D-LATE通过延长后期生殖阶段而提高小花原基存活率，从而持续提高穗育性。
Earliness per se (Eps) genes are important to fine tune adaptation, and studying their probable pleiotropic effect on wheat yield traits is worthwhile. In addition, it has been shown that some Eps genes interact with temperature. We studied two NILs differing in the newly identified Eps-7D but carrying insensitive Ppd-D1 in the background under three temperature regimes (9, 15 and 18 C) and two photoperiods (12 h and 24 h). Eps-7D affected time to anthesis as expected and the Eps-7D-late allele extended both the period before and after terminal spikelet. The interaction effect of Eps-7D× temperature was significant but not cross-over: the magnitude and level of significance of the difference between NILs with the late or early allele was affected by the growing temperature (ie difference was least at 18 C and largest at 9 C), and differences in temperature sensitivity was influenced by photoperiod. Rate of leaf initiation was faster in NIL with Eps-7D-early than with the late allele which compensated for the shorter duration of leaf initiation resulting in similar final leaf number between two NILs. Eps-7D-late consistently increased spike fertility through improving floret primordia survival as a consequence of extending the late reproductive phase.