Study on the effect of cold stress on cold resistance indexes of four varieties of Pistachio vera

Duan XiaoCui; Ni ZhiYun; Lu BingShe; Bai ZhiYing

Journal of Agricultural University of Hebei 28(4): 48-50

2005


Accession: 004477688

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Abstract
Cuttings (20-30 cm in length) of 4 pistachio cultivars (Larnaka, B, Sirora and Kerman) were held at -10, -15, -20 or -25 degrees C for 24 h. Electrical conductivity, the activities of superoxide dismutase (SOD) and peroxidase (POD) and the content of malondialdehyde (MDA) were determined. The electrical conductivity of the 4 cultivars increased with the temperature drop. The electrical conductivity of Larnaka, B, Sirora and Kerman at -15 degrees C was 15.58, 22.47, 21.33 and 22.55%, respectively, while that at -25 degrees C was 38.54, 41.69, 60.21 and 42.1%, respectively. The cold resistance of the 4 cultivars was in the order of Larnaka>B>Kerman>Sirora. SOD and POD activities and MDA content first increased and then decreased with the temperature drop. The most cold-resistant cultivar showed higher activities of SOD and POD and lower content of MDA. It is concluded that the concentration of SOD and POD, and the content of MDA can be used as indexes of cold resistance in P. vera.