Photosynthetica 2023, 61(1):13-24 | DOI: 10.32615/ps.2023.003
Photosynthetic performance of walnut leaves during the occurrence of leaf scorch
- College of Forestry and Landscape Architecture, Xinjiang Agricultural University/Key Laboratory of Forestry Ecology and Industry Technology in Arid Region, Education Department of Xinjiang, 311 Nongdadong Road, 830052 Urumqi, Xinjiang, China
To clarify the effect of leaf scorch on walnut leaf photosynthesis, photosynthetic parameters were measured in Juglans regia 'Wen185' and 'Xinxin2' symptom trees (WS, XS) and symptomless trees (WH, XH). At the early stage of infection and under the low-grade leaf scorch, WS showed significantly lower net photosynthetic rate (PN), stomatal limitation (Ls), and higher intercellular CO2 concentration (Ci) than those of WH. However, at the mid to late stage of infection and under the high-grade leaf scorch, WS showed significantly lower PN, Ci, the maximal quantum yield of PSII photochemistry and higher Ls, minimal fluorescence yield of the dark-adapted state, nonphotochemical quenching than those of WH, which would occur once Juglans regia 'Xinxin2' was infected. The above results indicated the effect of leaf scorch on walnut leaf photosynthesis was related to the walnut varieties and the duration and severity of the disease. Under the influence of leaf scorch, the decline in photosynthesis of Juglans regia 'Wen185' leaves changed from stomatal to nonstomatal restriction, while Juglans regia 'Xinxin2' leaves showed always nonstomatal restriction.
Additional key words: chlorophyll fluorescence; daily variation; gas exchange; seasonal changes; stomatal regulation.

Received: October 17, 2022; Revised: December 11, 2022; Accepted: January 6, 2023; Prepublished online: January 30, 2023; Published: April 13, 2023 Show citation
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