| Evaluation of drought tolerance and physiological response to drought stress of different varieties of quinoa seedlings |
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| DOI：10.7606/j.issn.1000-7601.2021.06.02 |
| Key Words: quinoa drought stress biomass physiology response subordinate function method |
| Author Name | Affiliation | | LIU Wenyu | Institute of Pasture and Green Agriculture, Gansu Academy of Agricultural Sciences, Lanzhou, Gansu 730070, China | | YANG Farong | Institute of Pasture and Green Agriculture, Gansu Academy of Agricultural Sciences, Lanzhou, Gansu 730070, China | | XIE Zhijun | Institute of Pasture and Green Agriculture, Gansu Academy of Agricultural Sciences, Lanzhou, Gansu 730070, China | | WANG Wangtian | College of Life Science and Technology, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | HUANG Jie | Institute of Pasture and Green Agriculture, Gansu Academy of Agricultural Sciences, Lanzhou, Gansu 730070, China | | WEI Yuming | Institute of Pasture and Green Agriculture, Gansu Academy of Agricultural Sciences, Lanzhou, Gansu 730070, China | | YANG Zhao | Gansu Academy of Agricultural Sciences, Lanzhou, Gansu 730070, China |
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| Abstract: |
| The purpose of this study was to evaluatethe drought stress on seedling growth and physiological characteristics of different quinoa varieties and their drought resistance. The experiment used four quinoa varieties as materials. Four drought different treatments were normal irrigation (CK), light drought stress (LD, soil moisture content 60%~50% of field capacity), moderate drought stress (MD, soil moisture content 40%~30% of field capacity), and severe drought stress (SD, soil moisture content 20%~10% of field capacity). Plant height, root length, root\|shoot ratio, chlorophyll, soluble sugar, soluble protein, proline, MDA content, O—·2 production rate, antioxidant enzyme activity and other physiological and biochemical indicators were measured. The relationship between indicators and drought stress was calculated by correlation analysis and principal component analysis, and the drought tolerance of 4 tested varieties was evaluated by membership function method. The results showed that compared with CK, the plant height of four quinoa varieties was decreased by 30.64%,28.36%,32.76% and 37.88%, root length was increased by 37.54%,81.46%,43.33%and 74.85%, and R/C ratio was increased by 42.86%, 33.33%,40.00% and 40.00% under SD treatment, respetively. The chlorophyll content of ‘Longli No.1’ was increased by 29.40% than CK, and the other varieties were decreased by 33.22%, 36.20%, 15.99%, respetively. The soluble sugar content was increased by 0.51%,1.67%,1.19% and 2.07%,and proline content was increased by 116.84%, 268.07%, 798.01% and 208.70%, SOD activity of ‘Longli No.3’ was increased by 6.67% than CK. POD activity was increased by 163.96%, 62.83%, 73.27% and 169.50%, and CAT activity was increased by 16.87%,11.44%,10.79% and 4.30% under SD treatment, respectively. The findings indicated that under drought stress, the activity of antioxidant enzymes of plant was enhanced, and osmotic regulating substances were accumulated to eliminate ROS in the body, so as to adapt to the drought environment. However, when drought stress reached to high degree, the activity of antioxidant enzyme was weakened, ROS was accumulated, and chlorophyll synthesis was inhibited, so plant growth was affected. Based on the analysis of subordination function method, the order of drought resistance (from strong to weak) of the 4 tested varieties was ‘LongLi No.1’=‘LongLi No. 3’>‘LongLi No. 2’>‘LongLi No. 4’. |
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