title: Sub-high Temperature and High Light Intensity Induced Irreversible Inhibition on Photosynthesis System of Tomato Plant (Solanum lycopersicumL.).
abstract: High temperature and high light intensity is a common environment posing a great risk to organisms. This study aimed to elucidate the effects of sub-high temperature and high light intensity stress (HH, 35°C, 1000 μmol⋅m-2⋅s-1) and recovery on the photosynthetic mechanism, photoinhibiton of photosystem II (PSII) and photosystem I (PSI), and reactive oxygen (ROS) metabolism of tomato seedlings. The results showed that with prolonged stress time, net photosynthetic rate (Pn), Rubisco activity, maximal photochemistry efficiency (Fv/Fm), efficient quantum yield and electron transport of PSII [Y(II) and ETR(II)] and PSI [Y(I) and ETR(I)] decreased significantly whereas yield of non-regulated and regulated energy dissipation of PSII [Y(NO) and Y(NPQ)] increased sharply. The donor side limitation of PSI [Y(ND)] increased but the acceptor side limitation of PSI [Y(NA)] decreased. Content of malondialdehyde (MDA) and hydrogen peroxide (H2O2) were increased while activity of superoxide dismutase (SOD) and peroxidase (POD) were significantly inhibited compared with control. HH exposure affected photosynthetic carbon assimilation, multiple sites in PSII and PSI, ROS accumulation and elimination ofSolanum lycopersicumL.
authors.affiliation: College of Horticulture, Shenyang Agricultural UniversityShenyang, China; Key Laboratory of Protected Horticulture of Education Ministry and Liaoning ProvinceShenyang, China; Collaborative Innovation Center of Protected Vegetable Surrounds Bohai Gulf RegionShenyang, China.
authors.forename: Tao
authors.initials: T
authors.lastname: Lu
authors.affiliation: College of Horticulture, Shenyang Agricultural UniversityShenyang, China; Key Laboratory of Protected Horticulture of Education Ministry and Liaoning ProvinceShenyang, China; Collaborative Innovation Center of Protected Vegetable Surrounds Bohai Gulf RegionShenyang, China.
authors.forename: Zhaojuan
authors.initials: Z
authors.lastname: Meng
authors.affiliation: College of Horticulture, Shenyang Agricultural UniversityShenyang, China; Key Laboratory of Protected Horticulture of Education Ministry and Liaoning ProvinceShenyang, China; Collaborative Innovation Center of Protected Vegetable Surrounds Bohai Gulf RegionShenyang, China.
authors.forename: Guoxian
authors.initials: G
authors.lastname: Zhang
authors.affiliation: College of Horticulture, Shenyang Agricultural UniversityShenyang, China; Key Laboratory of Protected Horticulture of Education Ministry and Liaoning ProvinceShenyang, China; Collaborative Innovation Center of Protected Vegetable Surrounds Bohai Gulf RegionShenyang, China.
authors.forename: Mingfang
authors.initials: M
authors.lastname: Qi
authors.affiliation: College of Horticulture, Shenyang Agricultural UniversityShenyang, China; Key Laboratory of Protected Horticulture of Education Ministry and Liaoning ProvinceShenyang, China; Collaborative Innovation Center of Protected Vegetable Surrounds Bohai Gulf RegionShenyang, China.
authors.forename: Zhouping
authors.initials: Z
authors.lastname: Sun
authors.affiliation: College of Horticulture, Shenyang Agricultural UniversityShenyang, China; Key Laboratory of Protected Horticulture of Education Ministry and Liaoning ProvinceShenyang, China; Collaborative Innovation Center of Protected Vegetable Surrounds Bohai Gulf RegionShenyang, China.
authors.forename: Yufeng
authors.initials: Y
authors.lastname: Liu
authors.affiliation: College of Horticulture, Shenyang Agricultural UniversityShenyang, China; Key Laboratory of Protected Horticulture of Education Ministry and Liaoning ProvinceShenyang, China; Collaborative Innovation Center of Protected Vegetable Surrounds Bohai Gulf RegionShenyang, China.
authors.forename: Tianlai
authors.initials: T
authors.lastname: Li
keywords: PSI; PSII; antioxidant system; photoinhibition; photosynthesis