Research Institute of Subtropical Forestry, Chinese Academy of Forestry, Fuyang, 311400, China.
Hangzhou Academy of Forestry, Hangzhou, 310016, China.
Sci Rep. 2017 Mar 15;7:44524. doi: 10.1038/srep44524.
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·, 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· 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· 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· 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.
水和氮是植物生长和发育的两个最重要的因素。然而，对于氮对连接的竹亚科分株之间水分转移的影响知之甚少。我们通过将相邻花盆中的绿竹分株用不同的土壤含水量和三个氮水平连接起来进行了实验。我们在配对单元中测定了抗氧化酶活性、渗透调节产物浓度、O·、MDA 和光合色素以及电解质渗透率。当支持分株的氮供应增加时，它们的电解质渗透率和 O·和 MDA 的含量显著增加，而连接的依赖分株中的抗氧化酶活性和渗透调节产物以及光合色素的含量则显著增加，因为它们的电解质渗透率和 O·和 MDA 的含量大大降低。当向依赖分株中添加氮时，两种分株中的抗氧化酶活性以及渗透调节产物和光合色素的含量都降低，但电解质渗透率以及 O·和 MDA 的含量显著增加。因此，向支持或依赖分株添加氮都可以改善绿竹分株之间的水分整合。向支持分株添加氮可促进水分转移并减轻依赖分株的水分胁迫，但向依赖分株添加氮会加剧干旱胁迫对依赖分株的损害。
