Response in cuttings of Taxodium hybrid 'Zhongshanshan' and their parents to drought and re-hydration.

• Published in: Ying yong sheng tai xue bao Vol. 27; no. 11; p. 3435
• Main Authors: Shi, Qin, Yin, Yun Long, Wang, Zhi Quan, Fan, Wen Cai, Hua, Jian Feng
• Format: Journal Article
• Language: Chinese
• Published: China 18.11.2016
• Subjects: drought and recovery; osmotic adjustment; Taxodium hybrid 'Zhongshanshan'; photosynthesis; antioxidase system
• ISSN: 1001-9332
• DOI: 10.13287/j.1001-9332.201611.024

In this study, three different strains of Taxodium hybrid 'Zhongshanshan' varieties [T. hybrid 302 (T. distichum♀×T. mucronatum♂), T. hybrid 407 (T. mucronatum♀×T. distichum♂), T. hybrid 118 (T. hybrid 302 ♀×T. macronatum ♂)] and their parents, T. distichum and T. mucronatum, were applied to investigate the response of photosynthetic characteristics, antioxidant enzyme systems and morphological characteristics to drought stress and recovery. The results indicated that as drought days were prolonged, all plants' net photosynthetic rate (P ) decreased, while proline accumulated. Meanwhile, the antioxidases functioned to eliminate malonaldehyde toxicity. On the 8 day, the decrease of P of T. distichum was the biggest, T. hybrid 118 plants showed the highest water use efficiency and the smallest MDA content, while T. macronatum plants increased the activity of superoxide dismutase and content of proline. After rewatering for 2 days, all these parameters showed signs of recovery, and the T. hybrid 118 plants showe