Comprehensive protection of tomato photosystem under cold stress by Streptomyces sp. TOR3209

Jia Ma, Jieli Peng, Nan Jia, Xu Wang, Yuxi He, Entao Wang, Dong Hu and Zhanwu Wang
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Jia Ma: Institute of Agro-Resources and Environment, Hebei Fertilizer Technology Innovation Center, Hebei Academy of Agriculture and Forestry Sciences, Shijiazhuang, Hebei, P.R. China
Jieli Peng: Institute of Agro-Resources and Environment, Hebei Fertilizer Technology Innovation Center, Hebei Academy of Agriculture and Forestry Sciences, Shijiazhuang, Hebei, P.R. China
Nan Jia: Institute of Agro-Resources and Environment, Hebei Fertilizer Technology Innovation Center, Hebei Academy of Agriculture and Forestry Sciences, Shijiazhuang, Hebei, P.R. China
Xu Wang: Institute of Agro-Resources and Environment, Hebei Fertilizer Technology Innovation Center, Hebei Academy of Agriculture and Forestry Sciences, Shijiazhuang, Hebei, P.R. China
Yuxi He: Institute of Agro-Resources and Environment, Hebei Fertilizer Technology Innovation Center, Hebei Academy of Agriculture and Forestry Sciences, Shijiazhuang, Hebei, P.R. China
Entao Wang: Institute of Agro-Resources and Environment, Hebei Fertilizer Technology Innovation Center, Hebei Academy of Agriculture and Forestry Sciences, Shijiazhuang, Hebei, P.R. China
Dong Hu: Institute of Agro-Resources and Environment, Hebei Fertilizer Technology Innovation Center, Hebei Academy of Agriculture and Forestry Sciences, Shijiazhuang, Hebei, P.R. China
Zhanwu Wang: Institute of Agro-Resources and Environment, Hebei Fertilizer Technology Innovation Center, Hebei Academy of Agriculture and Forestry Sciences, Shijiazhuang, Hebei, P.R. China

Horticultural Science, 2025, vol. 52, issue 3, 261-271

Abstract: The plant growth-promoting rhizobacterium Streptomyces sp. TOR3209 induces plant tolerance in a wide range of stress conditions. However, the protection of photosystem under cold stress has not been fully understood. Here we reported that the photochemistry activity of photosystem II (PSII) was increased in tomato plants receiving TOR3209 treatment, including the maximum quantum efficiency of PSII photochemistry (Fv/Fm), PSII operating efficiency (ΦPSII), PSII maximum efficiency (Fv'/Fm'), and non-photochemical quenching (NPQ). Microscopic study revealed that the integrity of chloroplast structure was greatly improved by TOR3209, which was damaged at low temperature. Moreover, TOR3209 treatment resulted in good protection on leaf stomatal and guard cell size. In response to TOR3209 treatment, the intercellular CO2 concentration (Ci) and stomatal limitation values (Ls) were decreased while the mesophyll conductance (gm) and chloroplast CO2 concentration (Cc) were increased. The carotenoid content in TOR3209-treated tomato was accumulated at a higher level, which was involved in photoprotection and biosynthesis of abscisic acid (ABA), as well as the increased amounts of ABA in the leaves were subsequently verified in the plants treated with TOR3209. These results demonstrated that TOR3209 treatment comprehensively protected tomato photosynthesis at low temperatures.

Keywords: chlorophyll a fluorescence; chloroplast ultrastructure; low temperature; photosystem II efficiency; Streptomyces (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:caa:jnlhor:v:52:y:2025:i:3:id:90-2024-hortsci

DOI: 10.17221/90/2024-HORTSCI

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