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Poplar PdPTP1 Gene Negatively Regulates Salt Tolerance by Affecting Ion and ROS Homeostasis in Populus.

Identifieur interne : 000200 ( Main/Exploration ); précédent : 000199; suivant : 000201

Poplar PdPTP1 Gene Negatively Regulates Salt Tolerance by Affecting Ion and ROS Homeostasis in Populus.

Auteurs : Yingying Lu [République populaire de Chine] ; Wanlong Su [République populaire de Chine] ; Yu Bao [République populaire de Chine] ; Shu Wang [République populaire de Chine] ; Fang He [République populaire de Chine] ; Dongli Wang [République populaire de Chine] ; Xiaoqian Yu [République populaire de Chine] ; Weilun Yin [République populaire de Chine] ; Chao Liu [République populaire de Chine] ; Xinli Xia [République populaire de Chine]

Source :

RBID : pubmed:32033494

Abstract

High concentrations of Na+ in saline soil impair plant growth and agricultural production. Protein tyrosine phosphorylation is crucial in many cellular regulatory mechanisms. However, regulatory mechanisms of plant protein tyrosine phosphatases (PTPs) in controlling responses to abiotic stress remain limited. We report here the identification of a Tyrosine (Tyr)-specific phosphatase, PdPTP1, from NE19 (Populus nigra × (P. deltoides × P. nigra). Transcript levels of PdPTP1 were upregulated significantly by NaCl treatment and oxidative stress. PdPTP1 was found both in the nucleus and cytoplasm. Under NaCl treatment, transgenic plants overexpressing PdPTP1 (OxPdPTP1) accumulated more Na+ and less K+. In addition, OxPdPTP1 poplars accumulated more H2O2 and O2·-, which is consistent with the downregulation of enzymatic ROS-scavengers activity. Furthermore, PdPTP1 interacted with PdMAPK3/6 in vivo and in vitro. In conclusion, our findings demonstrate that PdPTP1 functions as a negative regulator of salt tolerance via a mechanism of affecting Na+/K+ and ROS homeostasis.

DOI: 10.3390/ijms21031065
PubMed: 32033494
PubMed Central: PMC7037657


Affiliations:


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Le document en format XML

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<div type="abstract" xml:lang="en">High concentrations of Na
<sup>+</sup>
in saline soil impair plant growth and agricultural production. Protein tyrosine phosphorylation is crucial in many cellular regulatory mechanisms. However, regulatory mechanisms of plant protein tyrosine phosphatases (PTPs) in controlling responses to abiotic stress remain limited. We report here the identification of a Tyrosine (Tyr)-specific phosphatase, PdPTP1, from NE19 (
<i>Populus nigra</i>
× (
<i>P. deltoides</i>
×
<i>P. nigra</i>
). Transcript levels of
<i>PdPTP1</i>
were upregulated significantly by NaCl treatment and oxidative stress. PdPTP1 was found both in the nucleus and cytoplasm. Under NaCl treatment, transgenic plants overexpressing
<i>PdPTP1</i>
(
<i>OxPdPTP1</i>
) accumulated more Na
<sup>+</sup>
and less K
<sup>+</sup>
. In addition,
<i>OxPdPTP1</i>
poplars accumulated more H
<sub>2</sub>
O
<sub>2</sub>
and O
<sub>2</sub>
·
<sup>-</sup>
, which is consistent with the downregulation of enzymatic ROS-scavengers activity. Furthermore, PdPTP1 interacted with PdMAPK3/6 in vivo and in vitro. In conclusion, our findings demonstrate that PdPTP1 functions as a negative regulator of salt tolerance via a mechanism of affecting Na
<sup>+</sup>
/K
<sup>+</sup>
and ROS homeostasis.</div>
</front>
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<i>PdPTP1</i>
Gene Negatively Regulates Salt Tolerance by Affecting Ion and ROS Homeostasis in
<i>Populus</i>
.</ArticleTitle>
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<AbstractText>High concentrations of Na
<sup>+</sup>
in saline soil impair plant growth and agricultural production. Protein tyrosine phosphorylation is crucial in many cellular regulatory mechanisms. However, regulatory mechanisms of plant protein tyrosine phosphatases (PTPs) in controlling responses to abiotic stress remain limited. We report here the identification of a Tyrosine (Tyr)-specific phosphatase, PdPTP1, from NE19 (
<i>Populus nigra</i>
× (
<i>P. deltoides</i>
×
<i>P. nigra</i>
). Transcript levels of
<i>PdPTP1</i>
were upregulated significantly by NaCl treatment and oxidative stress. PdPTP1 was found both in the nucleus and cytoplasm. Under NaCl treatment, transgenic plants overexpressing
<i>PdPTP1</i>
(
<i>OxPdPTP1</i>
) accumulated more Na
<sup>+</sup>
and less K
<sup>+</sup>
. In addition,
<i>OxPdPTP1</i>
poplars accumulated more H
<sub>2</sub>
O
<sub>2</sub>
and O
<sub>2</sub>
·
<sup>-</sup>
, which is consistent with the downregulation of enzymatic ROS-scavengers activity. Furthermore, PdPTP1 interacted with PdMAPK3/6 in vivo and in vitro. In conclusion, our findings demonstrate that PdPTP1 functions as a negative regulator of salt tolerance via a mechanism of affecting Na
<sup>+</sup>
/K
<sup>+</sup>
and ROS homeostasis.</AbstractText>
</Abstract>
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