Effect of Poly(纬-glutamic acid) on the Physiological Responses and Calcium Signaling of Rape Seedlings (Brassica napus L.) under Cold Stress

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• 作者：Peng Lei ; Zongqi Xu ; Yan Ding ; Bao Tang ; Yunxia Zhang ; Huashan Li ; Xiaohai Feng ; Hong Xu
• 刊名：Journal of Agricultural and Food Chemistry
• 出版年：2015
• 出版时间：December 9, 2015
• 年：2015
• 卷：63
• 期：48
• 页码：10399-10406
• 全文大小：510K
• ISSN：1520-5118

文摘

Cold stress adversely affects plant growth and development. Poly(纬-glutamic acid) (纬-PGA) is a potential plant growth regulator that may be an effective cryoprotectant that prevents crops from damage during cold weather. In this study, the effects of 纬-PGA on the physiological responses of rape seedlings subject to cold stress were investigated using hydroponic experiments. We determined that the malondialdehyde content was decreased by 33.4% and the proline content was increased by 62.5% by 纬-PGA after 144 h under cold stress. Antioxidant enzymes activities were also evidently enhanced after treatment with 纬-PGA. These responses counteracted increases in the fresh weight and chlorophyll content of rape seedlings, which increased by 24.5 and 50.9%, respectively, after 144 h, which meant that growth inhibition caused by cold was mitigated by 纬-PGA. Our results also showed that 纬-PGA also regulated Ca²⁺ concentrations in the cytoplasm and calcium-dependent protein kinases, which are associated with cold resistance. In conclusion, we suggest that the Ca²⁺/CPKs signal pathway is involved in the 纬-PGA-mediated enhancement of cold resistance in rape seedlings.