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

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 seed...

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Published in:Journal of agricultural and food chemistry Vol. 63; no. 48; p. 10399
Main Authors: Lei, Peng, Xu, Zongqi, Ding, Yan, Tang, Bao, Zhang, Yunxia, Li, Huashan, Feng, Xiaohai, Xu, Hong
Format: Journal Article
Language:English
Published: United States 09.12.2015
Subjects:
Brassica napus - genetics
Brassica napus - metabolism
Calcium - metabolism
Catalase - metabolism
Chlorophyll - metabolism
Cold Temperature
Malondialdehyde - metabolism
Plant Leaves - metabolism
Plant Proteins - metabolism
Polyglutamic Acid - analogs & derivatives
Seedlings - genetics
Seedlings - growth & development
Seedlings - metabolism
Signal Transduction
Superoxide Dismutase - metabolism
proline
Ca2+ fluctuation
cold stress
antioxidant enzymes
Ca2+/CPKs signal pathway
poly(γ-glutamic acid)
ISSN:1520-5118, 1520-5118
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Summary: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 Ca(2+) concentrations in the cytoplasm and calcium-dependent protein kinases, which are associated with cold resistance. In conclusion, we suggest that the Ca(2+)/CPKs signal pathway is involved in the γ-PGA-mediated enhancement of cold resistance in rape seedlings.
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ISSN:1520-5118
1520-5118
DOI:10.1021/acs.jafc.5b04523