Response of physiological indexes of three Olea europaea cultivars to PEG stress

doi:10.12302/j.issn.1000-2006.202208063

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2024, Vol. 48 ›› Issue (2): 137-143.doi: 10.12302/j.issn.1000-2006.202208063

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Response of physiological indexes of three Olea europaea cultivars to PEG stress

DU Jincheng¹(), LI Xinxin¹, WANG Zeliang¹, LIU Si², ZHONG Yi¹, WANG Lihua¹^,^*()

1. Sichuan Academy of Forestry Science, Chengdu 610081, China
2. Sichuan Province Forestry and Grassland Science and Technology Extension General Station, Chengdu 610082, China

Received:2022-08-28 Revised:2022-09-20 Online:2024-03-30 Published:2024-04-08

Abstract

Abstract:

【Objective】 The physiological and biochemical response characteristics of leaves under continuous drought stress in three main cultivars of Olea europaea (‘Arbeqina’‘Koroneiki’ and ‘Arbosana’) in the Sichuan Province were compared to provide a basis for the cultivation and introduction of excellent varieties of olive according to local conditions. 【Method】 Taking ‘Arbeqina’‘Koroneiki'and ‘Arbosana’ as the research objects, polyethylene glycol 6000 (PEG-6000) solutions with mass ratio of 5%, 10%, 15%, 20%, and 30% were used to simulate continuous drought stress for 35 days. The corresponding physiological indicators of the leaves were analyzed, measured, and evaluated.【Result】 Over time with the deepening of osmotic stress, the functional traits of leaves among the three oleifera cultivars displayed certain interspecific differences. At the same time, the peroxidase (POD) and superoxide dismutase (SOD) activities in the leaves of the three cultivars of olive oil displayed an increasing trend. Compared with the cultivars, over time with the deepening of osmotic stress, the chlorophyll content of ‘Koroneiki’ decreased slightly, the proline content increased significantly, and the POD and SOD activities in leaves increased significantly. 【Conclusion】 The leaf function traits of the three olive varieties under different levels of continuous drought stress varied greatly, displaying different adaptive characteristics. Among the three varieties, the leaf function traits followed the order of ‘Koroneiki’>‘Arbosana’>‘Arbeqina’. Among the tested olive varieties, ‘Koroneiki’ had a strong osmotic adjustment ability and antioxidant capacity, and a strong adaptability to drought stress, being superior to ‘Arbosana’ and ‘Arbeqina’.

Key words: Olea europaea, drought stress, PEG stress, physiological properties of leaves, Sichuan Province

CLC Number:

S718

DU Jincheng, LI Xinxin, WANG Zeliang, LIU Si, ZHONG Yi, WANG Lihua. Response of physiological indexes of three Olea europaea cultivars to PEG stress[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY, 2024, 48(2): 137-143.

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Response of physiological indexes of three Olea europaea cultivars to PEG stress

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