The Role of SlPIP1;7 in Improving Photosynthetic Efficiency,  Root Water Uptake,  and Salt Stress Tolerance of Tomato

Shuya Fan, Hong Wu, Nani Han, Jianhua Jia, and Jia Guo

doi:10.7235/HORT.20210070

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2021 Vol.39, Issue 6 Preview Page Next Page

Research Article

The Role of SlPIP1;7 in Improving Photosynthetic Efficiency, Root Water Uptake, and Salt Stress Tolerance of Tomato

31 December 2021. pp. 795-806

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Abstract

Plasma-membrane intrinsic proteins (PIPs) play important regulatory roles in plant growth and development, and in the maintenance of water homeostasis under stress conditions. To investigate the function of SlPIP1;7 in tomato (Solanum lycopersicum) plants, we created transgenic tomato lines in which the SlPIP1;7 gene was overexpressed or silenced. SlPIP1;7-overexpressing and SlPIP1;7-silenced plants were taller and shorter than wild-type plants, respectively. Additionally, silenced lines had a significantly narrower stem diameter than wild-type plants and severely retarded shoot and root growth, suggesting that overexpression of SlPIP1;7 enhances tomato growth. Moreover, SlPIP1;7-overexpressing plants exhibited increased salt stress tolerance, while SlPIP1;7-silenced plants were more sensitive to salt stress. SlPIP1;7-overexpressing plants showed a higher photosynthetic rate and root hydraulic conductivity, less electrolyte leakage, and less malondialdehyde and reactive oxygen species accumulation under salt stress compared to the wild-type; SlPIP1;7- silenced plants showed the opposite tendencies. These results suggest that overexpression of SlPIP1;7 promotes photosynthetic efficiency, root water uptake, and antioxidant defense in plants under salt stress, thereby imparting salt tolerance. SlPIP1;7 is thus a valuable genetic resource to enhance stress tolerance in tomato plants.

Keywords

aquaporins

plasma-membrane intrinsic proteins

root hydraulic conductivity

soil salinity

stomatal conductance

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Information

Publisher :KOREAN SOCIETY FOR HORTICULTURAL SCIENCE
Publisher(Ko) :원예과학기술지
Journal Title :Horticultural Science and Technology
Journal Title(Ko) :원예과학기술지
Volume : 39
No :6
Pages :795-806
Received Date :2021. 04. 21
Revised Date :2021. 06. 21
Accepted Date : 2021. 09. 13
DOI :https://doi.org/10.7235/HORT.20210070

Horticultural Science and Technology 원예과학기술지 ISSN:1226-8763(Print) 2465-8588(Online)

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