| Biology and Soil |
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| Morphological and Physiological Characteristics of Almond under Low Temperature Stress and Its Cold Resistance |
| JI Chun-rong1, ZOU Chen1, CHEN Cong-min2, LIU Li-hong2, LI Xin-jian1 |
1.Xinjiang Key Laboratory of Tree Ring Ecology/Key Laboratory of Tree-ring Physical and Chemical Research of China Meteorological Administration, Institute of Desert Meteorology, China Meteorological Administration, Urumqi 830002, China;
2.Shache Agro-meteorological Experimental Station, Shache 844700, Xinjiang, China |
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Abstract Shache No.1, Yingjisha No.2 and Shache No.18 are the main cultivars of Almond in Kashgar region of Xinjiang, China. The permeability of plasma membrane and chlorophyll fluorescence of the different cultivars of Almond under different low temperature stress were measured to research characteristic changes and their cold resistance with the one year old dormant branches of the cultivars as tested materials. Results showed that the relative conductivity increased, and the damage to plasma membrane increased with decrease of temperature. The critical freezing temperature resulting in damage to the cultivars of Almond ranged from -24 ℃ to -27 ℃. The semilethal temperature of Shache No.1, Yingjisha No.2 and Shache No.18 were -24.9 ℃, -29.3 ℃, -27.7 ℃, respectively. The minimum fluorescence (Fo) of Almond increased firstly with decrease of temperature, and then decreased after reaching a peak value at typical temperature. The maximum photochemical efficiency (Fv/Fm) decreased evidently with decrease of temperature. The damage to photosystem Ⅱ (PSⅡ) could be induced by low temperature of -24～-27 ℃, and the weaker the cold resistance was, the obvious the damage was. Comprehensive analysis to these three cultivars of almond showed that Yingjisha No.2 had the strongest cold resistance, followed by Shache No.18, and the cold resistance of Shache No.1 was the worst.
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Received: 23 October 2011
Published: 22 November 2011
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2012, Vol. 32 
