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Tocopherol-deficient rice plants display increased sensitivity to photooxidative stress

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Abstract

Main conclusion

Tocopherol-deficient transgenic plants were generated by silencing HPT and TC. They exhibited distinct phenotype and physiological parameters under high light condition, indicating that tocopherol is indispensable in photoprotection in rice.

Abstract

Tocopherols are lipophilic antioxidants that are synthesized exclusively in photosynthetic organisms. Despite extensive in vivo characterization of tocopherol functions in plants, their functions in the monocot model plant, rice, remain to be determined. In this study, transgenic rice plants constitutively silenced for homogentisate phytyltransferase (HPT) and tocopherol cyclase (TC) activity were generated. Silencing of HPT and TC resulted in up to a 98 % reduction in foliar tocopherol content relative to the control plants, which was also confirmed by transcript level analysis. When grown under normal conditions, HPT and TC transgenics showed no distinctive phenotype relative to the control plants, except a slight reduction in plant height and a slight decrease in the first leaf length. However, when exposed to high light at low temperatures, HPT and TC transgenics had a significantly higher leaf yellowing index than the control plants. The tocopherol-deficient plants decreased their total individual chlorophyll levels, their chlorophyll a/b ratio, and the maximum photochemical efficiency of photosystem II, whereas increased lipid peroxidation levels relative to the control plants. Tocopherol deficiency had no effect on ascorbate biosynthesis, but induced glutathione, antheraxanthin, and particularly zeaxanthin biosynthesis for compensation under stressful conditions. However, despite these compensation mechanisms, HPT and TC transgenics still exhibited altered phenotypes under high light at low temperatures. Therefore, it is suggested that tocopherols cannot be replaced and play an indispensable role in photoprotection in rice.

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Abbreviations

2,4-D:

2,4-Dichlorophenoxyacetic acid

A:

Antheraxanthin

ABA:

Abscisic acid

ASA:

Ascorbate

chl P:

Geranylgeranyl reductase

Chl:

Chlorophyll

DHA:

Dedydroascorbate

DMBPQ:

2,3-Dimethyl-5-phytyl-1,4-benzoquinone

FW:

Fresh weight

GSH:

Glutathione

GSSG:

Oxidized glutathione

HPT:

Homogentisate phytyltransferase

MDA:

Malondialdehyde

NPQ:

Non-photochemical quenching

NT:

Non transformed plant

PC-8:

Plastochromanol-8

PQ-9:

Plastoquinone-9

PSII:

Photosystem II

ROS:

Reactive Oxygen Species

SXD1:

Sucrose export defective1

TC:

Tocopherol cyclase

TCA:

Trichloroacetic acid

Ubi:

Ubiquitin

V:

Violaxanthin

WT:

Wild type

Z:

Zeaxanthin

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Acknowledgments

The research was supported by the grant of the National Natural Science Foundation of China (No. 31070273), the key project of Tianjin Science and Technology Support Program (11ZCGYNC01000) and the 111 Project (No. B08011).

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Correspondence to Xiwen Chen.

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Chen, D., Chen, H., Zhang, L. et al. Tocopherol-deficient rice plants display increased sensitivity to photooxidative stress. Planta 239, 1351–1362 (2014). https://doi.org/10.1007/s00425-014-2064-8

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