Seasonal variations in photosynthetic efficiency and antioxidant characteristics of the current and one year-old leaves in Torreya grandis‘Merrillii’

doi:10.12302/j.issn.1000-2006.202204017

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2024, Vol. 48 ›› Issue (2): 45-50.doi: 10.12302/j.issn.1000-2006.202204017

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Seasonal variations in photosynthetic efficiency and antioxidant characteristics of the current and one year-old leaves in Torreya grandis‘Merrillii’

ZHAO Xiaolong¹(), SHEN Jiayi¹, LIU Tao², WU Jiasheng¹, HU Yuanyuan¹^,^*()

1. State Key Laboratory of Subtropical Silviculture, College of Forestry and Biotechnology, Zhejiang A & F University, Hangzhou 311300, China
2. Hangzhou Raw Seed Growing Farm, Hangzhou 311115, China

Received:2022-03-04 Revised:2022-04-18 Online:2024-03-30 Published:2024-04-08

Abstract

Abstract:

【Objective】 Determination of seasonal changes in chlorophyll fluorescence parameters, antioxidant enzymes, malondialdehyde (MDA) and other parameters in current and 1 year-old leaves of Torreya grandis ‘Merrillii’ was to study the adaptive mechanism of the photosynthetic characteristics of T. grandis ‘Merrillii’ leaves to temperature changes during season. 【Method】 The chlorophyll fluorescence parameters, specific leaf weight (SLW), antioxidant enzyme activity and soluble protein changes of T. grandis ‘Merrillii’ leaves were measured in May, June, August, November and January of the second year. 【Result】 (1) Compared with mid-May, Φ_PSⅡ of T. grandis ‘Merrillii’ leaves in mid-August was significantly up-regulated, while Φ_NPQ was significantly down-regulated, and Φ_NOwith little change. SOD and CAT activities in T. grandis ‘Merrilli’ current leaves were significantly increased, POD activity was significantly decreased, and MDA with little change.(2) Compared with mid-November, the average temperature in January of the second year decreased by nearly 10 ℃. Φ_PSⅡ and Φ_NPQ of T. grandis ‘Merrillii’ current leaves and one-year old leaves decreased significantly, while their Φ_NOand MDA content increased significantly. 【Conclusion】 Compared with mid-May, T. grandis ‘Merrillii’ current leaves and one-year old leaves markedly improved Φ_PSⅡ in mid-August is due to the high temperature and its leaves to absorb more light, and used for electron transfer, less dissipation of energy in the form of heat, the photosynthetic photoinhibition not occurring, its strong antioxidant enzyme system can coordinate to help them adapt to the high temperature specular environment. Compared with mid-November, T. grandis ‘Merrillii’ current leaves and one-year old leaves suffered cold damage during overwintering in mid-January of the second year, and the photosynthetic organs of leaves suffered light damage. Above all, T. grandis ‘Merrillii’ leaves are resistant to heat weather but not to cold weather, which may be the limiting factor of northern expansion.

Key words: Torreya grandis ‘Merrillii’, different leaf age, antioxidant enzymes, photosynthetic characteristics, seasonal change

CLC Number:

S791.43

ZHAO Xiaolong, SHEN Jiayi, LIU Tao, WU Jiasheng, HU Yuanyuan. Seasonal variations in photosynthetic efficiency and antioxidant characteristics of the current and one year-old leaves in Torreya grandis‘Merrillii’[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY, 2024, 48(2): 45-50.

Figures/Tables 4

References 25

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月份 month	平均最高气温 mean max air temperature	平均最低气温 mean min air temperature
5	28.06±3.63 b	18.26±2.00 b
6	27.83±2.41 b	21.40±1.55 b
8	35.06±2.10 a	26.71±1.04 a
11	17.80±2.33 c	11.37±2.74 c
1	8.09±4.25 d	1.81±3.64 d

Seasonal variations in photosynthetic efficiency and antioxidant characteristics of the current and one year-old leaves in Torreya grandis‘Merrillii’

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