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

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[1] Lei, Peng
[2] Xu, Zongqi
[3] Ding, Yan
[4] Tang, Bao
[5] Zhang, Yunxia
[6] Li, Huashan
[7] Feng, Xiaohai
[8] Xu, Hong
来源：
Feng, Xiaohai (fengxiaohai@njtech.edu.cn) | 1600年 / American Chemical Society卷 / 63期
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Cold stress adversely affects plant growth and development. Poly(γ-glutamic acid) (γ-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 γ-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 γ-PGA after 144 h under cold stress. Antioxidant enzymes activities were also evidently enhanced after treatment with γ-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 γ-PGA. Our results also showed that γ-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 γ-PGA-mediated enhancement of cold resistance in rape seedlings. © 2015 American Chemical Society;
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