Comprehensive evaluation of physiological response and cold tolerance of domesticated Cinnamomum camphora (L.) Presl under low temperature stress

作者：Jinping Ding, Zongying Zhang, Xinyu Zhu, Ying Hou · 发表于：PeerJ · 年份：2024 · DOI：10.7717/peerj.18590 · 被引用次数：2 · 研究领域：Plant Stress Responses and Tolerance、Plant Water Relations and Carbon Dynamics、Bamboo properties and applications

Improving cold tolerance is one of the key techniques for introducing southern tree species to northern China. To provide a theoretical basis for the introduction and cold-tolerance cultivation of Cinnamomum camphora (L.) Presl, the physiological response and cold tolerance of acclimated Cinnamomum camphora (L.) Presl trees were studied. In this experiment, the cold tolerance physiological indexes of Cinnamomum camphora (L.) Presl were measured in an indoor artificial simulation of low temperature stress. The results showed that under low temperature stress, the Cinnamomum camphora (L.) Presl are cultivated for 1 year, 5 years, 10 years and 15 years, respectively, at 4 °C, 0 °C, −5 °C, −10 °C, −15 °C and −20 °C. The relative electrical conductivity change ranges were 26.26%–13.98%, 30.71%–19.24%, 37.36%–27.18%, 44.16%–32.24%, 63.21%–52.05%, and 86.43%–76.24%; the MDA content ranges were 12.10 mmol/g–3.25 mmol/g, 15.90 mmol/g–4.08 mmol/g, 10.53 mmol/g–2.05 mmol/g, 23.20 mmol/g–5.35 mmol/g, 31.30 mmol/g–5.89 mmol/g, and 36.47 mmol/g–8.13 mmol/g, respectively. The relative water content change ranges were 95.35%–65.92%, 71.36%–49.67%, 54.67%–34.89%, 43.12%–23.12%, 26.03%–11.21%, and 23.03%–8.15%, respectively. At the same stress temperature, these indices decreased with increasing cultivation time, and the degree of membrane damage was reduced accordingly. The osmoprotectants were soluble protein, soluble sugar, and free proline which were increased gradually with cultivation ti...