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| Selection of bolt low-cadmium-accumulation rapeseed varieties and investigation of the effect of trehalose on their cadmium accumulation and quality |
| Received:June 22, 2023 |
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| KeyWord:rapeseed flower stalk;cadmium accumulation;trehalose;low-accumulation varieties;quality |
| Author Name | Affiliation | E-mail | | ZOU Xiangyu | College of Agronomy, Anhui Agricultural University, Hefei 230036, China | | | YUE Wenli | College of Agronomy, Anhui Agricultural University, Hefei 230036, China | | | HE Yuan | College of Agronomy, Anhui Agricultural University, Hefei 230036, China | | | DING Maowen | College of Agronomy, Anhui Agricultural University, Hefei 230036, China | | | LI Rui | College of Agronomy, Anhui Agricultural University, Hefei 230036, China | | | DONG Jia | College of Agronomy, Anhui Agricultural University, Hefei 230036, China | | | ZHU Zonghe | College of Agronomy, Anhui Agricultural University, Hefei 230036, China | | | ZHENG Wenyin | College of Agronomy, Anhui Agricultural University, Hefei 230036, China | | | ZHANG Fugui | College of Agronomy, Anhui Agricultural University, Hefei 230036, China | | | ZHOU Kejin | College of Agronomy, Anhui Agricultural University, Hefei 230036, China | | | YU Yan | College of Agronomy, Anhui Agricultural University, Hefei 230036, China | yuyan@ahau.edu.cn |
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| Abstract: |
| To improve cultivation and regulation for the safe production of“oil - vegetable dual - usage”rapeseed（Brassica napus）in cadmium（Cd）-contaminated farmland, this study employed 22 varieties B. napus as the primary materials. Through pot experiments, this study aimed to identify rapeseed varieties with low Cd accumulation based on differences in Cd accumulation and aboveground dry weight. Furthermore, the effects of exogenous trehalose application at different stages（seedling stage, bolting stage, and seedling + bolting stage） and concentrations（10, 20, 40 mmol·L-1, and 80 mmol·L-1）on the growth, Cd accumulation, and quality of bolt low-Cd-accumulation varieties. The results indicated significant differences in Cd accumulation and aboveground dry weight among 22 rapeseed varieties under Cd stress. Notably, Annongyou 1（ANY-1）and Tongyouza 2（TYZ-2）exhibited high-biomass and low-Cd-accumulation characteristics, making them suitable for cultivation as dual-usage rapeseed varieties. Compared with the control（CK）, Cd treatment resulted in stunted rapeseed growth and reduced rapeseed flower stalk yield and quality. The exogenous application of 10 - 40 mmol ·L-1 trehalose could alleviate the toxicity of Cd on rapeseed to varying degrees, reduce Cd accumulation in rapeseed flower stalks, and improve the yield and quality. Among the different application stages and concentrations, spraying 20 mmol ·L-1 trehalose at the seedling stage was the most effective. Spraying 20 mmol·L-1 trehalose at the seedling stage alleviated Cd toxicity in two rapeseed varieties. It significantly increased the relative chlorophyll content（SPAD）, shoot fresh weight, root fresh weight, and crown diameter by 13.4%-16.1%, 59.1%-63.3%, 42.1%- 103.6%, and 30.6%-37.8%, respectively. The Cd content of rapeseed flower stalks was significantly decreased by 61.5%-70.6%, while the yield, soluble protein, and soluble sugar contents were increased by 28.4%-34.5%, 41.9%-46.0%, and 62.6%-76.1%, respectively. In conclusion, the cultivation of rapeseed varieties ANY-1 and TYZ-2 with bolt low Cd accumulation in Cd-contaminated soil, combined with spraying 20 mmol·L-1 trehalose at the seedling stage, effectively reduced Cd accumulation in rapeseed flower stalk, ensuring their safety for consumption and improving their yield and quality. |
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