TaER Expression Is Associated with Transpiration Efficiency Traits and Yield in Bread Wheat.
TaER Expression Is Associated with Transpiration Efficiency Traits and Yield in Bread Wheat.
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DOI：
10.1371/journal.pone.0128415
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发表时间：
2015
期刊：
影响因子：
3.7
通讯作者：
Hu YG
中科院分区：
文献类型：
--
作者：
Zheng J;Yang Z;Madgwick PJ;Carmo-Silva E;Parry MA;Hu YG
ERECTA编码一种受体样激酶，被认为是测定植物蒸腾效率的候选基因。在小麦6号染色体(TaER2)和7号染色体(TaER1)上发现了两个与ERECTA同源的基因，分别位于小麦的A、B和D基因组上。在小麦抽穗期(Z55)和灌浆期(Z73)的旗叶中，TaER1和TaER2的表达模式相似，但表达水平相对较高。在48个不同的面包小麦品种中，TaER1和TaER2在两个生育期的旗叶中的表达水平均存在显著差异。根据Taer1和Taer2的表达情况，可将48个小麦品种分为高表达(5个品种)、中等表达(27个品种)和低表达(16个品种)三类。与蒸腾效率(TE)相关的气孔密度(SD)、蒸腾速率、光合速率(A)、瞬时水分利用效率(WUEi)和碳同位素识别率(CID)等蒸腾效率相关性状以及生物量生产植株1号(BYPP)和籽粒产量植株1号(GYPP)的产量性状在3个不同蒸腾效率(TE)相关性状上也存在显著差异。相关分析表明，TaER1和TaER2在两个生育期的表达与SD(P<；0.01)、蒸腾速率(P<；0.05)和CID(P<；0.01)显著负相关，与旗叶面积(Fla，P<；0.01)、A(P<；0.05)、WUEI(P<；0.05)、BYPP(P<；0.01)和GYPP(P<；0.01)显著正相关。0.0 1)，TaER1的相关性大于TaER2，灌浆期的相关性大于抽穗期。这些综合结果表明，Taer参与了面包小麦蒸腾效率相关性状和产量的发育，暗示了Taer在调控面包小麦叶片发育中的作用，并有助于这些性状的表达。此外，本研究结果还表明，Taer基因在小麦改良中可用于重要农艺性状的调控。
ERECTA encodes a receptor-like kinase and is proposed as a candidate for determining transpiration efficiency of plants. Two genes homologous to ERECTA in Arabidopsis were identified on chromosomes 6 (TaER2) and 7 (TaER1) of bread wheat (Triticum aestivum L.), with copies of each gene on the A, B and D genomes of wheat. Similar expression patterns were observed for TaER1 and TaER2 with relatively higher expression of TaER1 in flag leaves of wheat at heading (Z55) and grain-filling (Z73) stages. Significant variations were found in the expression levels of both TaER1 and TaER2 in the flag leaves at both growth stages among 48 diverse bread wheat varieties. Based on the expression of TaER1 and TaER2, the 48 wheat varieties could be classified into three groups having high (5 varieties), medium (27 varieties) and low (16 varieties) levels of TaER expression. Significant differences were also observed between the three groups varying for TaER expression for several transpiration efficiency (TE)- related traits, including stomatal density (SD), transpiration rate, photosynthetic rate (A), instant water use efficiency (WUEi) and carbon isotope discrimination (CID), and yield traits of biomass production plant-1 (BYPP) and grain yield plant-1 (GYPP). Correlation analysis revealed that the expression of TaER1 and TaER2 at the two growth stages was significantly and negatively associated with SD (P<0.01), transpiration rate (P<0.05) and CID (P<0.01), while significantly and positively correlated with flag leaf area (FLA, P<0.01), A (P<0.05), WUEi (P<0.05), BYPP (P<0.01) and GYPP (P<0.01), with stronger correlations for TaER1 than TaER2 and at grain-filling stage than at heading stage. These combined results suggested that TaER involved in development of transpiration efficiency -related traits and yield in bread wheat, implying a function for TaER in regulating leaf development of bread wheat and contributing to expression of these traits. Moreover, the results indicate that TaER could be exploitable for manipulating important agronomical traits in wheat improvement.
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