Vyas Dhiraj, Kumar Sanjay, Ahuja Paramvir Singh
Biotechnology Division, Institute of Himalayan Bioresource Technology, P.O. Box 6, Palampur, 176061 India.
Tree Physiol. 2007 Sep;27(9):1253-9. doi: 10.1093/treephys/27.9.1253.
Tea (Camellia sinensis (L.) O. Kuntze) is a perennial crop grown throughout the world. During winter, tea undergoes a dormancy period when growth of apical buds almost ceases, severely reducing the commercial yield of tea. Low temperatures prevail during the period of winter dormancy, which alone or in combination with high solar irradiance have the potential to induce oxidative stress in plants. We studied six tea clones under field conditions to test whether a relationship exists between oxidative stress and winter dormancy. Data on the behavior of the enzymatic antioxidative system was collected for all clones during different phases of winter dormancy. There was a strong positive correlation among clones between accumulation of reactive oxygen species (ROS) and the length of the dormancy period. Clones having shorter dormancy periods exhibited higher induction of antioxidative enzymes. Results suggest that efficient scavenging of ROS is a desirable feature in tea because it leads to lower accumulations of ROS during winter months and is associated with reduced winter dormancy.
茶树（Camellia sinensis (L.) O. Kuntze）是一种在全球范围内种植的多年生作物。在冬季，茶树会经历一个休眠期，此时顶芽的生长几乎停止，严重降低了茶叶的商业产量。冬季休眠期间普遍存在低温，单独或与高太阳辐射相结合，有可能在植物中诱导氧化应激。我们在田间条件下研究了六个茶树无性系，以测试氧化应激与冬季休眠之间是否存在关系。在冬季休眠的不同阶段，收集了所有无性系的酶促抗氧化系统行为数据。无性系之间活性氧（ROS）积累与休眠期长度之间存在很强的正相关。休眠期较短的无性系表现出更高的抗氧化酶诱导水平。结果表明，高效清除ROS是茶树的一个理想特征，因为它会导致冬季ROS积累减少，并与冬季休眠减少有关。
