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- Title
Effects of Potassium Fertilizer on Alfalfa Antioxidant Enzyme Activity Under Low Temperature Stress.
- Authors
ZHANG Qingxin; ZHANG Yuxia; SUN Mingxue; XIA Quanchao; WANG Xianguo; LIU Tingyu; DU Xiaoyan
- Abstract
In order to explore the effects of potassium fertilizer types and dosage on the cold resistance of alfalfa, and to reveal the antioxidant physiological mechanism of potassium fertilizer to improve the cold resistance of alfalfa, ' Gibraltar' alfalfa was as the material, and a two-factor (potassium fertilizer application amount and type) randomized block experiment was designed, which 3 types of potash fertilizers (potassium chloride, potassium sulfate and potassium dihydrogen phosphate ) were used and the applying amounts were set according to 0, 100, 200, 300 kg K2O⋅hm-2. The overwintering organs of alfalfa were excavated to simulate low temperature stress treatment (4, -10, -20 and -30 °C) in the early stage of overwintering, and the content of malondialdehyde (MDA), superoxide dismutase (SOD), catalase (CAT), peroxidase (POD) activity in the root crown of alfalfa were determined.The results showed that, under the low temperature freezing stress treatment, the MDA contents of alfalfa treated with 3 kinds of potassium fertilizers were lower than that of the control, and the decreased range of K2SO4 treatment was the most significantly (P<0.05). With the increase of potassium fertilizer application, MDA decreased first and then increased. Under the treatment of 200 kg K2O⋅hm-2, the difference between MDA content and CK in root crown of alfalfa was the most significant (P<0.05).The changes of antioxidant enzyme activities in the alfalfa materials treated with different application rates of the 3 potassium fertilizers were opposite to those of MDA under low temperature stress treatment. The activity of SOD, POD and CAT were the highest and both had the most significant difference with CK (P<0.05).It showed that the alfalfa treated with K2SO4 in autumn and the application rate of 200 kg K2O⋅hm-2 had the strongest cold resistance. The results showed that potassium fertilizer with appropriate dosage could improve the antioxidant properties of alfalfa root and neck under low temperature stress, reduce the degree of membrane lipid peroxidation, improve the cold resistance of alfalfa, and be more conducive to the safe overwintering of alfalfa.
- Subjects
GIBRALTAR; POTASSIUM fertilizers; ALFALFA; LOW temperatures; POTASSIUM; POTASSIUM dihydrogen phosphate; LIPID peroxidation (Biology); POTASSIUM channels
- Publication
Journal of Agricultural Science & Technology (1008-0864), 2023, Vol 25, Issue 8, p186
- ISSN
1008-0864
- Publication type
Article
- DOI
10.13304/j.nykjdb.2022.0058