光合作用
苗木
生物
糖
脯氨酸
非生物胁迫
耐旱性
超氧化物歧化酶
非生物成分
丙二醛
碳水化合物代谢
禾本科
农学
新陈代谢
植物
园艺
生物化学
基因
氧化应激
氨基酸
生态学
作者
Longfei Xin,Huifang Zheng,Zuoren Yang,Jia Guo,Tianxue Liu,Lei Sun,Yang Xiao,Jianping Yang,Qinghua Yang,Lin Guo
标识
DOI:10.1016/j.jplph.2018.05.005
摘要
Low water availability is a major abiotic factor limiting photosynthesis and the growth and yield of crops. Maize (Zea mays) is among the most drought-sensitive cereal crops. Herein, the physiological and proteomic changes of maize seedlings caused by polyethylene-glycol-induced water deficit were analyzed. The results showed that malondialdehyde and proline contents increased continuously in the treated seedlings. Soluble sugar content and superoxide dismutase activity were upregulated initially but became downregulated under prolonged water deficit. A total of 104 proteins were found to be differentially accumulated under water stress. The identified proteins were mainly involved in photosynthesis, carbohydrate metabolism, stress defense, energy production, and protein metabolism. Interestingly, substantial incongruence between protein and transcript levels was observed, indicating that gene expression in water-stressed maize seedlings is controlled by complex mechanisms. Finally, we propose a hypothetical model that includes the different molecular, physiological, and biochemical changes that occurred during the response and tolerance of maize seedlings to water deficiency. Our study provides valuable insight for further research into the overall mechanisms underlying drought response and tolerance in maize and other plants.
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