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| Physiological response and cadmium tolerance evaluation of ginger cultivars to cadmium stress |
| Received:May 18, 2023 |
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| KeyWord:ginger;cadmium resistance;physiological response;evaluation of cadmium resistance;membership function analysis |
| Author Name | Affiliation | E-mail | | WANG Jie | Yangtze University, College of Horticulture and Landscape Architecture, Jingzhou 434025, China | | | ZHU Xuedong | Chongqing Southeast Chongqing Academy of Agricultural Sciences, Fuling 408013, China | | | SUN Chong | Chongqing University of Arts and Sciences, College of Landscape and Life Sciences, Yongchuan 402160, China | | | MA Jiawei | Yangtze University, College of Horticulture and Landscape Architecture, Jingzhou 434025, China | | | WU Yanbi | Yangtze University, College of Horticulture and Landscape Architecture, Jingzhou 434025, China | | | LIU Yiqing | Yangtze University, College of Horticulture and Landscape Architecture, Jingzhou 434025, China | | | ZHU Yongxing | Yangtze University, College of Horticulture and Landscape Architecture, Jingzhou 434025, China | xbnlzyx@163.com |
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| Abstract: |
| This study aimed to explore the effects of cadmium (Cd) stress on morphological characteristics and physiological indices of ginger at the seedling stage, screened Cd-tolerant germplasm resources, and established an evaluation system for Cd tolerance of ginger. The findings provide a reference for research on Cd-resistant mechanisms of ginger and breeding of Cd-resistant varieties. Five main cultivars in the main ginger producing areas of East, Central, and Southwest China (fengtoujiang, guizhouxiaojiang, yunnanxiaojiang, zhugenjiang, and shandongdajiang) were the experimental materials. Normal water treatment (control, CK) and Cd water treatment were consistent. CK was not an external addition to Cd treatment. The characteristics of growth and physiological indices, chlorophyll, and chlorophyll fluorescence were determined for CK and Cd treatments. Principal component analysis and membership function approach were used to assess the Cd tolerance of the five cultivars at the seedling stage. Cd treatment significantly decreased plant height, stem diameter, catalase activity, photosynthetic pigment content, Fv/Fm and photochemical quenching coefficient (P<0.05). Thiobarbituric acid reactive substances(TBARS), superoxide dismutase, and non-photochemical quenching coefficient in leaves were significantly increased (P< 0.05). There were no significant changes in peroxidase (POD) activity, and the contents of proline and carotenoid(Car) in shandongdajiang. The comprehensive evaluation results ranked the Cd tolerance of the five ginger varieties as shandongdajiang> guizhouxiaojiang>yunnanxiaojiang>fengtoujiang>zhugenjiang. Stem diameter and Car content were positively correlated with D value (P< 0.01). TBARS content and POD activity in leaves were negatively correlated with D value. The Cd content of zhugenjiang was 3.57 times that of shandongdajiang. Cd was mainly enriched in the roots and leaves of zhugenjiang and in the roots of shandongdajiang. Among the five varieties, shandongdajiang and zhugenjiang had the strongest and poorest Cd tolerance, respectively. Stem diameter, Car and TBARS contents, and POD activity in leaves could be the main reference indices for screening Cd-tolerant varieties of ginger. |
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