Articles
Identification of some drought resistance mechanisms in four pistachio seedling rootstocks under water stress
Article number
1315_55
Pages
367 – 374
Language
English
Abstract
This research was conducted to identify the drought resistance mechanisms of four pistachio seedling rootstocks.
Irrigation treatments were 100% ETc (control), 65% ETc (medium stress), and 30% ETc (severe stress), which were applied on 4-month-old seedlings for 75 days.
Evaluated rootstocks were Pistacia vera Badami-e-Zarand, Ghazvini, Sarakhs, and P. mutica. Physiological parameters such as gas exchanges, water relations, photochemical efficiency of photosystem ІІ (Fv/Fm ratio) and carbon isotope discrimination (Δ), biochemical parameters such as contents of proline, carbohydrate, and chlorophyll, and growth parameters were investigated.
Generally, water stress decreased CO2 assimilation (A), stomatal conductivity (gs), leaf water potential (Ψw), relative water content (RWC), Fv/Fm ratio, carbon isotope discrimination, chlorophyll content, and biomass, while contents of proline and carbohydrate were increased.
Based on the results, P. mutica and P. vera Badami-e-Zarand had higher photosynthesis and higher RWC under water stress.
The higher RWC of P. mutica, despite its lower leaf water potential, can be attributed to better osmotic regulation.
The highest Fv/Fm ratio and chlorophyll content under water stress also were observed in P. mutica. A smaller reduction in growth parameters also was observed in P. mutica and P. vera Badami-e-Zarand under water stress conditions.
According to the mentioned reasons, it can be concluded that the rootstocks P. mutica and P. vera Badami-e-Zarand were the most drought tolerant rootstocks.
Carbon isotope discrimination and proline accumulation were not suitable indexes for the screening of drought-tolerant rootstocks.
Irrigation treatments were 100% ETc (control), 65% ETc (medium stress), and 30% ETc (severe stress), which were applied on 4-month-old seedlings for 75 days.
Evaluated rootstocks were Pistacia vera Badami-e-Zarand, Ghazvini, Sarakhs, and P. mutica. Physiological parameters such as gas exchanges, water relations, photochemical efficiency of photosystem ІІ (Fv/Fm ratio) and carbon isotope discrimination (Δ), biochemical parameters such as contents of proline, carbohydrate, and chlorophyll, and growth parameters were investigated.
Generally, water stress decreased CO2 assimilation (A), stomatal conductivity (gs), leaf water potential (Ψw), relative water content (RWC), Fv/Fm ratio, carbon isotope discrimination, chlorophyll content, and biomass, while contents of proline and carbohydrate were increased.
Based on the results, P. mutica and P. vera Badami-e-Zarand had higher photosynthesis and higher RWC under water stress.
The higher RWC of P. mutica, despite its lower leaf water potential, can be attributed to better osmotic regulation.
The highest Fv/Fm ratio and chlorophyll content under water stress also were observed in P. mutica. A smaller reduction in growth parameters also was observed in P. mutica and P. vera Badami-e-Zarand under water stress conditions.
According to the mentioned reasons, it can be concluded that the rootstocks P. mutica and P. vera Badami-e-Zarand were the most drought tolerant rootstocks.
Carbon isotope discrimination and proline accumulation were not suitable indexes for the screening of drought-tolerant rootstocks.
Publication
Authors
M. Ghasemi, K. Arzani, A. Yadollahi, H. Hokmabadi, R.D. Guy
Keywords
pistachio, seedling rootstocks, water stress, carbon isotope discrimination
Groups involved
- Division Temperate Tree Fruits
- Division Vine and Berry Fruits
- Division Tropical and Subtropical Fruit and Nuts
- Division Ornamental Plants
- Division Plant-Environment Interactions in Field Systems
- Division Postharvest and Quality Assurance
- Division Horticulture for Development
- Division Precision Horticulture and Engineering
- Division Plant Genetic Resources, Breeding and Biotechnology
- Commission Cultivar Registration
- Division Horticulture for Human Health
- Division Greenhouse and Indoor Production Horticulture
- Division Landscape and Urban Horticulture
- Commission Banana
- Division Vegetables, Roots and Tubers
- Division Temperate Tree Nuts
- Commission Agroecology and Organic Farming Systems
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