Photosynthetica 2018, 56(4):1429-1436 | DOI: 10.1007/s11099-018-0842-4

Effects of leaf-to-fruit ratio on chlorophyll fluorescence parameters of walnut (Juglans regia L.) leaves

C. F. Zhang1, C. D. Pan1,*, H. Chen1
1 Education Department of Xinjiang, College of Forestry and Horticulture, Xinjiang Agricultural University/Key Laboratory of Forestry Ecology and Industry Technology in Arid Region, Urumqi, Xinjiang, China

In this study, we investigated maximal quantum yield of PSII photochemistry(Fv/Fm),effective quantum yield of PSII photochemistry (ΦPSII), and nonphotochemical quenching (NPQ) of walnut (Juglans regia 'Xinxin2') leaves with different leaf-to-fruit ratios (LFRs). The results indicated that the increasing LFR increased the values of Fv/Fm, ΦPSII, and NPQ in leaves on the girdled shoot with one and two leaves, and decreased the values of Fv/Fm and ΦPSII in leaves on the girdled shoot with five leaves, whereas had no effect on the chlorophyll (Chl) fluorescence in leaves on the girdled shoot with three and four leaves. These results indicate that the effects of LFR on Chl fluorescence depend on a LFR range and show a transitional trend transition, and that excessive fruit load accelerates leaf senescence resulting in the destruction of the reaction center in PSII.

Keywords: defoliation; fruit tree; photochemical efficiency of PSII

Received: June 10, 2017; Accepted: January 1, 2018; Prepublished online: December 1, 2018; Published: November 1, 2018Show citation

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Zhang, C.F., Pan, C.D., & Chen, H. (2018). Effects of leaf-to-fruit ratio on chlorophyll fluorescence parameters of walnut (Juglans regia L.) leaves. Photosynthetica, 56(4), 1429-1436. doi: 10.1007/s11099-018-0842-4.
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