Fulvic Acid Alleviates the Toxicity Induced by Calcium Nitrate Stress by Regulating Antioxidant and Photosynthetic Capacities and Nitrate Accumulation in Chinese Flowering Cabbage Seedlings
文献类型： 外文期刊
作者： Wu, Xue 1 ; Zhang, Ying 1 ; Chu, Yufeng 3 ; Yan, Yifei 4 ; Wu, Cuinan 2 ; Cao, Kai 2 ; Ye, Lin 1 ;
作者机构： 1.Ningxia Univ, Agr Coll, Yinchuan 750021, Peoples R China
2.Jiangsu Acad Agr Sci, Inst Agr Facil & Equipment, Key Lab Agr Engn Middle & Lower Reaches Yangtze Ri, Agr Minist, Nanjing 210014, Peoples R China
3.Anhui Agr Univ, Coll Hort, Hefei 230036, Peoples R China
4.Nanjing Agr Univ, Hort Coll, Nanjing 210014, Peoples R China
关键词： calcium nitrate; Chinese flowering cabbage; fulvic acid; photosystem; antioxidant capacity; nitrate accumulation
期刊名称：APPLIED SCIENCES-BASEL （ 影响因子：2.7； 五年影响因子：2.9 ）
ISSN：
年卷期： 2023 年 13 卷 22 期
页码：
收录情况： SCI
摘要： Continuous cropping can lead to an excessive accumulation of nitrate in facility-cultured soil. Excessive accumulation of nitrate gradually becomes the main reason for crop failure in vegetables and endangers human health. Therefore, the exploration of effective measures to decrease abundant nitrate accumulation in Chinese flowering cabbage is indispensable. In this study, a kind of plant growth regulator, fulvic acid (FA), was used to study its positive effect on alleviating the growth inhibition induced by excessive Ca(NO3)(2) in Chinese flowering cabbage. Meanwhile, we conducted hydroponic cultivation and measured the growth indices, photosynthetic and oxidation-reduction characteristics of Chinese flowering cabbage with different treatments. After determining the optimal treatment concentration, we mainly designed four treatment groups, including Con, FA, Ca(NO3)(2) and FA + Ca(NO3)(2) cotreatment, to explore the regulatory mechanism by which FA alleviates Ca(NO3)(2) stress in Chinese flowering cabbage. The results showed that FA can effectively alleviate the inhibitory effect of excessive Ca(NO3)(2) on the growth of Chinese flowering cabbage seedlings. FA recovered the photosynthetic capacity of seedlings under Ca(NO3)(2) stress. In addition, FA depressed the accumulation of O2 center dot-, H2O2, malondialdehyde (MDA) and relative electrical conductivity, but increased the activity of antioxidant enzymes, including SOD, POD, CAT and APX, which finally enhanced the stress resistance of Chinese flowering cabbage to Ca(NO3)(2). The expression of nitrate-related transporters, BcNRT1.1 and BcNRT1.5, was depressed by FA, which inhibited redundant nitrate absorption and restricted more nitrate from being stored in the roots instead of being transferred to the shoot. Ultimately, nitrate accumulation in the edible part was reduced in Chinese flowering cabbage seedlings. In general, exogenous FA may alleviate nitrate stress by improving oxidation resistance, photosynthetic capacity and redundant Ca(NO3)(2) accumulation in Chinese flowering cabbage.
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