Nitrogen addition and clonal integration alleviate water stress of dependent ramets of Indocalamus decorus under heterogeneous soil water environment

作者：Guo, Zi-Wu^*; Hu, Jun-Jing; Chen, Shuang-Lin^*; Li, Ying-Chun; Yang, Qing-Ping; Cai, Han-Jiang

来源：Scientific Reports, 2017, 7(1): 44524.

DOI：10.1038/srep44524

• DIVISION-OF-LABOR
• PHYSIOLOGICAL INTEGRATION
• ALTERNANTHERA-PHILOXEROIDES
• ANTIOXIDANT SYSTEM
• ALPINE MEADOW
• PLANT
• PERFORMANCE
• DEPOSITION
• AVAILABILITY
• BAMBOO

Water and nitrogen are two of the most important factors for plant growth and development. However, little is known about effects of N on water translocation between connected bamboo ramets. We performed experiment connected Indocalamus decorus ramets in adjacent pots with different soil water contents and three N levels. We determined antioxidase activities, concentration of osmotic adjustment products, O-2.(-), MDA and photosynthetic pigments, and electrolyte leakage rate in paired unit. When N supply to supporting ramets increased, their electrolyte leakage rates and contents of O-2.(-) and MDA significantly increased, while antioxidase activities and contents of osmotic adjustment products and photosynthetic pigments in connected dependent ramets increased markedly as their electrolyte leakage rates and contents of O-2.(-) and MDA decreased greatly. When N addition to dependent ramets increased, antioxidant enzyme activity and contents of osmotic adjustment products and photosynthetic pigments decreased in both ramets, but electrolyte leakage rates and O-2.(-) and MDA contents increased significantly. Therefore, N addition to either supporting or dependent ramets can improve water integration among I. decorus ramets. N addition to supporting ramets promotes water translocation and alleviates water stress of dependent ramets, but N addition to dependent ramets exacerbates drought stress damage to dependent ramets.

• 出版日期2017-3-15
• 单位中国林业科学研究院; 中国林业科学研究院亚热带林业研究所