文献类型： 外文期刊

作者： Liu, Yan-Lan ¹ ; Guo, Xian-Shi ¹ ; Ma, Ming-Sheng ¹ ; Yu, Xian-Feng ¹ ;

作者机构： 1.Gansu Acad Agr Sci, Inst Dry Land Farming, Lanzhou 730070, Gansu, Peoples R China; Key Lab Efficient Water Utilizat Dryland Farming, Lanzhou 730070, Gansu, Peoples R China

关键词： Adaptation mechanisms; Growth compensation; Biomass allocation; Abscisic acid (ABA); Maize seedlings

期刊名称：PAKISTAN JOURNAL OF BOTANY （ 影响因子：0.972； 五年影响因子：0.988 ）

ISSN： 0556-3321

年卷期： 2018 年 50 卷 6 期

页码：

收录情况： SCI

摘要： A pot-culture study was conducted to estimate the role of abscisic acid (ABA) and its regulatory mechanisms in maize seedlings to adapt water deficit and re-watering conditions. The maize seedlings (Zea mays L.) were exposed to well-watered, water deficit and re-watering conditions at seedling stage. Results showed that ABA concentration was significantly increased 1.97-fold and 1.73-fold (p < 0.01) under moderate and severe drought stress conditions, respectively. Moreover, drought stress significantly increased the activities of antioxidant enzymes (SOD, POD and CAT), and the concentration of MDA and O-2(-). The photo synthetic rate (Pn), stomatal conductance (g(s)), and transpiration rate (E) in leaves were decreased by withholding water for 2 days. Our study demonstrated that the plants physio-biochemical traits and gas exchange parameters vanation under drought probably were caused by a higher level of ABA. The shoot biomass was reduced by 34.4% and 66.1% and the root biomass was reduced by 44% and 69% under moderate and severe drought stress treatments, respectively Results showed that the root biomass had more reduction under drought stress treatments, indicating that water deficit affected plants biomass allocation patterns. We conclude that ABA plays an important role in regulating the plant growth under drought stress and re-watenng conditions, and improve the osmotic adjustment for plant better growth and development.