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反复缺水会导致柑橘类植物发生表观遗传和激素变化。

Recurrent water deficit causes epigenetic and hormonal changes in citrus plants.

机构信息

Departamento de Biologia, Centro de Genética e Biologia Molecular, Universidade Estadual de Santa Cruz, Ilhéus-Bahia, 45662-900, Brazil.

Departamento de Saúde, Faculdade de Ciências Empresariais, Santo Antônio de Jesus-Bahia, 44573-045, Brazil.

出版信息

Sci Rep. 2017 Oct 20;7(1):13684. doi: 10.1038/s41598-017-14161-x.

DOI:10.1038/s41598-017-14161-x
PMID:29057930
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5651809/
Abstract

The present study evaluated the physiological, molecular and hormonal parameters from scion/rootstock interaction of citrus plants during recurrent water deficit. Responses of the Valencia (VO) scion variety grafted on two rootstocks with different soil water extraction capacities, Rangpur Lime (RL) and Sunki Maravilha (SM), during three successive periods of water deficit: plants exposed to a single episode of water deficit (WD1) and plants exposed to two (WD2) and three (WD3) recurrent periods of WD were compared. The combinations VO/RL and VO/SM presented polymorphic alterations of epigenetic marks and hormonal (i.e. abscisic acid, auxins and salicylicacid) profiles, which were particularly prominent when VO/SM plantswere exposed toWD3 treatment. Upon successive drought events, the VO/SM combination presented acclimatization characteristics that enable higher tolerance to water deficit by increasing transpiration (E), stomatal conductance (g ) and photosynthetic rate (A), which in turn may have facilitated the whole plant survival. Besides providing comprehensive data on the scion/rootstock interactions upon successive stress events, this study brings the first dataset suggesting that epigenetic alterations in citrus plants triggered by recurrent water deficit lead to improved drought tolerance in this crop species.

摘要

本研究评估了柑橘植株在反复水分亏缺过程中接穗/砧木相互作用的生理、分子和激素参数。在三个连续的水分亏缺期，比较了 Valencia（VO）接穗品种嫁接到两个具有不同土壤水分提取能力的砧木（Rangpur Lime RL 和 Sunki Maravilha SM）上的表现：只经历一次水分亏缺（WD1）的植株和经历两次（WD2）和三次（WD3）重复水分亏缺的植株。VO/RL 和 VO/SM 组合表现出表观遗传标记和激素（即脱落酸、生长素和水杨酸）特征的多态性改变，当 VO/SM 植株暴露于 WD3 处理时，这些改变尤为明显。在连续的干旱事件中，VO/SM 组合表现出适应特征，通过增加蒸腾作用（E）、气孔导度（g ）和光合速率（A）来提高对水分亏缺的耐受性，这反过来又可能促进整个植物的存活。本研究除了提供关于接穗/砧木在连续胁迫事件中相互作用的综合数据外，还首次提出了一个数据集，表明柑橘植株因反复水分亏缺而引发的表观遗传改变导致该作物物种对干旱胁迫的耐受性提高。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab44/5651809/17deca1e2d52/41598_2017_14161_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab44/5651809/40b2c90e3c1d/41598_2017_14161_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab44/5651809/74a03bde82fc/41598_2017_14161_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab44/5651809/43dc055b446c/41598_2017_14161_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab44/5651809/e12d7b6fdaa2/41598_2017_14161_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab44/5651809/131590d0cf46/41598_2017_14161_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab44/5651809/17deca1e2d52/41598_2017_14161_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab44/5651809/40b2c90e3c1d/41598_2017_14161_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab44/5651809/74a03bde82fc/41598_2017_14161_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab44/5651809/43dc055b446c/41598_2017_14161_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab44/5651809/e12d7b6fdaa2/41598_2017_14161_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab44/5651809/131590d0cf46/41598_2017_14161_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ab44/5651809/17deca1e2d52/41598_2017_14161_Fig6_HTML.jpg

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