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Overexpression of SlGGP-LIKE gene enhanced the resistance of tomato to salt stress

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Abstract

Ascorbic acid (AsA) plays an important role in scavenging reactive oxygen species (ROS) and reducing photoinhibition in plants, especially under stress. The function of SlGGP which encodes the key enzyme GDP-L-galactose phosphorylase in AsA synthetic pathway is relatively clear. However, there is another gene SlGGP-LIKE that encodes this enzyme in tomato, and there are few studies on it, especially under salt stress. In this study, we explored the function of this gene in tomato salt stress response using transgenic lines overexpressing SlGGP-LIKE (OE). Under normal conditions, overexpressing SlGGP-LIKE can increase the content of reduced AsA and the ratio of AsA/ DHA (dehydroascorbic acid), as well as the level of xanthophyll cycle. Under salt stress, compared with the wild-type plants (WT), the OE lines can maintain higher levels of reduced AsA. In addition, OE lines also have higher levels of reduced GSH (glutathione) and total GSH, higher ratios of AsA/DHA and GSH/oxidative GSH (GSSR), and higher level of xanthophyll cycle. Therefore, the OE lines are more tolerant to salt stress, with higher photosynthetic activity, higher antioxidative enzyme activities, higher content of D1 protein, lower production rate of ROS, and lighter membrane damage. These results indicate that overexpressing SlGGP-LIKE can enhance tomato resistance to salt stress through promoting the synthesis of AsA.

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Abbreviations

A:

Antheraxanthin

APX:

Ascorbic acid peroxidase

CAT:

Catalase

DHA:

Dehydroascorbic acid

Fv/Fm:

The maximal photochemical efficiency of PSII

GDP:

Guanosine 5′-diphosphate

GGP:

GDP-L-galactose phosphorylase

GR:

Glutathione reductase

GSH:

Glutathione

GSSH:

Oxidized glutathione

MDA:

Malondialdehyde

NADPH:

Nicotinamide adenine dinucleotide phosphate

O2 •− :

Superoxide anion radical

OE:

Overexpression

Pn:

Net photosynthetic rate

POD:

Peroxidase

PSII:

Photosystem II

REC:

Relative electric conductivity

ROS:

Reactive oxygen species

SOD:

Superoxidase dismutas

V:

Violaxanthin

VDE:

Violaxanthin de-epoxidase

WT:

Wild-type

Z:

Zeaxanthin

ZEP:

Zeaxanthin epoxidase

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Funding

This work was supported by the Natural Science Foundation of Shandong Province (ZR2019BC069), Major Project of Science and Technology of Shandong Province (2022CXGC010605), Modern Agricultural Technology System of Shandong Province (SDAIT-06–14), and Scientific Research Guidance Fund of Shandong Academy of Grape (SDAG2021B01).

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Correspondence to Na-Na Ma.

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The authors declare no competing interests.

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Yang, DY., Zhuang, KY. & Ma, NN. Overexpression of SlGGP-LIKE gene enhanced the resistance of tomato to salt stress. Protoplasma 260, 625–635 (2023). https://doi.org/10.1007/s00709-022-01800-y

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  • DOI: https://doi.org/10.1007/s00709-022-01800-y

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