Resveratrol improves the iron deficiency adaptation of Malus baccata seedlings by regulating iron absorption.
Resveratrol improves the iron deficiency adaptation of Malus baccata seedlings by regulating iron absorption.
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白藜芦醇通过调节铁吸收提高苹果幼苗的缺铁适应性
DOI：
10.1186/s12870-021-03215-y
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发表时间：
2021-09-23
影响因子：
5.3
通讯作者：
Tian Y
中科院分区：
文献类型：
--
作者：
Zheng X;Chen H;Su Q;Wang C;Sha G;Ma C;Sun Z;Yang X;Li X;Tian Y
白藜芦醇 (Res) 是一种植物抗毒素，已被广泛报道参与植物对真菌感染的抵抗力。然而，关于其在非生物胁迫，特别是缺铁胁迫中的作用的信息很少。苹果在我国广泛用作苹果砧木，但对缺铁敏感。在本研究中，我们研究了缺铁胁迫下外源 Res 在 M. baccata 幼苗中的作用。结果表明，施用 100 μM 外源 Res 可以缓解缺铁应激。与未经Res处理的苹果幼苗相比，经Res处理的幼苗黄化率较低，叶绿素含量和光合速率较高。外源Res通过诱导MbAHA基因的表达和提高H+-ATPase活性来增加根和叶中的铁含量。结果，根际pH值降低，铁溶解度增加，诱导MbFRO2和MbIRT1表达，铁螯合还原酶活性增强，在缺铁条件下将大量Fe2+吸收到根细胞中。此外，外源Res的施用增加了IAA、ABA和GA3的含量，降低了DHZR和BL的含量，从而间接响应缺铁胁迫。此外，Res还具有抗氧化剂的作用，可以增强抗氧化酶的活性，从而消除缺铁应激引起的活性氧的产生。白藜芦醇主要通过调节铁吸收来改善红果树幼苗的缺铁适应能力。在线版本包含可在 10.1186/s12870-021-03215-y 获取的补充材料。
Resveratrol (Res), a phytoalexin, has been widely reported to participate in plant resistance to fungal infections. However, little information is available on its role in abiotic stress, especially in iron deficiency stress. Malus baccata is widely used as apple rootstock in China, but it is sensitive to iron deficiency. In this study, we investigated the role of exogenous Res in M. baccata seedings under iron deficiency stress. Results showed that applying 100 μM exogenous Res could alleviate iron deficiency stress. The seedlings treated with Res had a lower etiolation rate and higher chlorophyll content and photosynthetic rate compared with the apple seedlings without Res treatment. Exogenous Res increased the iron content in the roots and leaves by inducing the expression of MbAHA genes and improving the H+-ATPase activity. As a result, the rhizosphere pH decreased, iron solubility increased, the expression of MbFRO2 and MbIRT1 was induced, and the ferric-chelated reductase activity was enhanced to absorb large amounts of Fe2+ into the root cells under iron deficiency conditions. Moreover, exogenous Res application increased the contents of IAA, ABA, and GA3 and decreased the contents of DHZR and BL for responding to iron deficiency stress indirectly. In addition, Res functioned as an antioxidant that strengthened the activities of antioxidant enzymes and thus eliminated reactive oxygen species production induced by iron deficiency stress. Resveratrol improves the iron deficiency adaptation of M. baccata seedlings mainly by regulating iron absorption. The online version contains supplementary material available at 10.1186/s12870-021-03215-y.
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