Effects and Evaluation of Low Irradiation Stress on Photosynthetic Characteristics of Grapevine Leaves in Greenhouse

doi:10.3969/j.issn.1000-6362.2017.12.007

Abstract

Abstract: To study the effects of low irradiation (LI) on grape (Vitis vinifera L., cv Hongti) growth, a controlled experiment was carried out in growth chambers. Three levels of photosynthetic active radiation (PAR) were set for grapes：normal irradiation [L0, 600μmol(photon)?m-2?s-1] and low irradiation [L1, 80μmol(photon)?m-2?s-1; L2, 100μmol(photon)?m-2?s-1]．The experiment lasted for 9d, then all groups of grapes were transferred to L0 to recover for 16d. The principal component analysis was used to screen the relative chlorophyll content, photosynthetic parameters, and chlorophyll fluorescence dynamics parameters; light stress index (LSI) was defined, and the stress level was classified combined with recovery growth. The results showed that, (1) the photosynthesis was inhibited by LI, relative chlorophyll content (SPAD), light saturation point (LSP), photosynthetic rate at irradiation saturation (Pnmax), apparent quantum efficiency (AQE), stomatal conductance (Gs), transpiration rate (Tr), photochemical quenching coefficient (qP), and electron transport rate (ETR) decreased under LI, while the non-photochemical quenching coefficient (qN) was opposite. The change of all indices under L1 was bigger than that of L2, after 9 d, Pnmax decreased to 26.5%, while qN increased to 189%, compared to CK. Maximal photochemical efficiency of PSII (Fv/Fm) increased at first, and then decreased with an increase of stress time, it peaked on the 5th d under L1. (2) The quick recovery stage of photosynthetic parameters was 0-8d, and it took about 12d to resume to CK or a relatively stable state.(3) Taking the recovery state of photosynthetic parameters into consideration, and combining with the LSI at 12d of recovery, the LI disaster level was divided into four grade, that is level 0 (1d under L1, and 1-3d under L2), levelⅠ (2-3d under L1, and 4-7d under L2), level Ⅱ (4-7d under L1, and 8-9d under L2), and level Ⅲ(more than 7d under L1, and more than 9d under L2).

Key words: Low irradiation stress and recovery, Light stress index, Regrowth method

LI Kai-wei, YANG Zai-qiang,XIAO Fang, WANG Lin, YANG Shi-qiong. Effects and Evaluation of Low Irradiation Stress on Photosynthetic Characteristics of Grapevine Leaves in Greenhouse[J]. Chinese Journal of Agrometeorology, 2017, 38(12): 801-811.

References

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