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TaANR1-TaBG1 and TaWabi5-TaNRT2s/NARs Link ABA Metabolism and Nitrate Acquisition in Wheat Roots.
Plant Physiology ( IF 6.5 ) Pub Date : 2020-01-14 , DOI: 10.1104/pp.19.01482 Meng Wang 1 , Pengli Zhang 1 , Qian Liu 1 , Guangjie Li 1 , Dongwei Di 1 , Guangmin Xia 2 , Herbert J Kronzucker 3, 4 , Shuang Fang 5 , Jinfang Chu 5 , Weiming Shi 6
Plant Physiology ( IF 6.5 ) Pub Date : 2020-01-14 , DOI: 10.1104/pp.19.01482 Meng Wang 1 , Pengli Zhang 1 , Qian Liu 1 , Guangjie Li 1 , Dongwei Di 1 , Guangmin Xia 2 , Herbert J Kronzucker 3, 4 , Shuang Fang 5 , Jinfang Chu 5 , Weiming Shi 6
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Nitrate is the preferred form of nitrogen for most plants, acting both as a nutrient and a signaling molecule. However, the components and regulatory factors governing nitrate uptake in bread wheat (Triticum aestivum), one of the world's most important crop species, have remained unclear, largely due to the complexity of its hexaploid genome. Here, based on recently released whole-genome information for bread wheat, the high-affinity nitrate transporter2 (NRT2) and the nitrate-assimilation-related (NAR) gene family are characterized. We show that abscisic acid (ABA)- Glc ester deconjugation is stimulated in bread wheat roots by nitrate resupply following nitrate withdrawal, leading to enhanced root-tissue ABA accumulation, and that this enhancement, in turn, affects the expression of root-type NRT2/NAR genes. TaANR1 is shown to regulate nitrate-mediated ABA accumulation by directly activating TaBG1, while TaWabi5 is involved in ABA-mediated NO3 - induction of NRT2/NAR genes. Building on previous evidence establishing ABA involvement in the developmental response to high-nitrate stress, our study suggests that ABA also contributes to the optimization of nitrate uptake by regulating the expression of NRT2/NAR genes under limited nitrate supply, offering a new target for improvement of nitrate absorption in crops.
中文翻译：
TaANR1-TaBG1 和 TaWabi5-TaNRT2s/NAR 将小麦根部的 ABA 代谢和硝酸盐获取联系起来。
硝酸盐是大多数植物首选的氮形式，既充当营养物质又充当信号分子。然而，面包小麦（Triticum aestivum）是世界上最重要的作物品种之一，控制硝酸盐吸收的成分和调控因素仍不清楚，这主要是由于其六倍体基因组的复杂性。在此，根据最近发布的面包小麦全基因组信息，对高亲和力硝酸盐转运蛋白 2 (NRT2) 和硝酸盐同化相关 (NAR) 基因家族进行了表征。我们发现，硝酸盐撤除后，硝酸盐补给会刺激面包小麦根中脱落酸（ABA）-葡萄糖酯的解离，从而导致根组织ABA积累增强，而这种增强反过来会影响根型NRT2的表达/NAR 基因。 TaANR1 通过直接激活 TaBG1 来调节硝酸盐介导的 ABA 积累，而 TaWabi5 则参与 ABA 介导的 NO3 - NRT2/NAR 基因的诱导。基于先前证实 ABA 参与对高硝酸盐胁迫的发育反应的证据，我们的研究表明 ABA 还通过在有限的硝酸盐供应下调节 NRT2/NAR 基因的表达来促进硝酸盐吸收的优化，从而提供了新的改进目标作物对硝酸盐的吸收。
更新日期：2020-03-03
中文翻译：
TaANR1-TaBG1 和 TaWabi5-TaNRT2s/NAR 将小麦根部的 ABA 代谢和硝酸盐获取联系起来。
硝酸盐是大多数植物首选的氮形式，既充当营养物质又充当信号分子。然而，面包小麦（Triticum aestivum）是世界上最重要的作物品种之一，控制硝酸盐吸收的成分和调控因素仍不清楚，这主要是由于其六倍体基因组的复杂性。在此，根据最近发布的面包小麦全基因组信息，对高亲和力硝酸盐转运蛋白 2 (NRT2) 和硝酸盐同化相关 (NAR) 基因家族进行了表征。我们发现，硝酸盐撤除后，硝酸盐补给会刺激面包小麦根中脱落酸（ABA）-葡萄糖酯的解离，从而导致根组织ABA积累增强，而这种增强反过来会影响根型NRT2的表达/NAR 基因。 TaANR1 通过直接激活 TaBG1 来调节硝酸盐介导的 ABA 积累，而 TaWabi5 则参与 ABA 介导的 NO3 - NRT2/NAR 基因的诱导。基于先前证实 ABA 参与对高硝酸盐胁迫的发育反应的证据，我们的研究表明 ABA 还通过在有限的硝酸盐供应下调节 NRT2/NAR 基因的表达来促进硝酸盐吸收的优化，从而提供了新的改进目标作物对硝酸盐的吸收。
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