摘要
[目的]探讨极端气候对桉树幼苗光合作用和生长的影响。[方法]在低温(5℃/0℃)和高温(40℃/36℃)(昼/夜)环境下,探讨了广西八桂种苗高科技集团股份有限公司(BG)和其他苗圃(NBG)的尾巨桉(Eucalyptus urophylla×E.grandis)无性系DH32-29幼苗光合作用和生长对低温和高温胁迫的响应。[结果]常温时,BG幼苗的光合速率、气孔导度、叶片胞间CO_(2)浓度、蒸腾速率均显著高于NBG幼苗;在低温和高温胁迫下,BG和NBG生产的尾巨桉幼苗的光合作用和生长速率均显著下降,但BG幼苗的光合作用参数显著高于NBG幼苗。BG幼苗的冷、热害指数分别为0~1和2~3级,NBG的冷热害指数分别为1~2和3~4级。[结论]在正常温度环境中,BG幼苗比NBG幼苗具有更强的光合作用能力,在极端气候胁迫时也具有更强的抗性和恢复能力。
[Objective]In order to investigate the effects of extreme climate on photosynthesis and seedling growth of Eucalyptus urophylla×E.grandis.[Method]We compared the photosynthesis and growth affected by low(5℃/0℃)and high temperature(40℃/36℃)(day/night)between seedlings from Bagui Seedlings Co.,LTD.(BG)and another anonymous nursery(NBG).[Result]The results showed that photosynthetic rate,stomatal conductance,intercellular CO_(2) concentration and transpiration rate of BG seedlings were significantly higher than those of NBG seedlings at room temperature.The seedling photosynthesis and growth rate decreased significantly with low and high temperature stress.The photosynthetic parameters of BG seedlings were also significantly higher than those of NBG after low or high temperature treatment.The cold and heat damage indexes of BG seedlings were 0-1 and 2-3,respectively,yet those of NBG seedlings were 1-2 and 3-4,respectively.[Conclusion]This indicated that BG seedlings had a stronger photosynthetic ability than NBG seedlings in normal temperature and have stronger resistance and recovery ability in extreme climate stress.
作者
周雪梦
周晓果
温远光
吴衍霖
杨婷
邓少虹
高惠
黄勇杰
陈秋海
ZHOU Xue-meng;ZHOU Xiao-guo;WEN Yuan-guang(Institute of Eco-Environmental Research,Guangxi Academy of Sciences,Nanning,Guangxi 530007)
出处
《安徽农业科学》
2025年第12期74-80,87,共8页
Journal of Anhui Agricultural Sciences
基金
广西自然科学基金项目(2023GXNSFAA026415)
国家自然科学基金项目(32160358,32360284)。
关键词
尾巨桉幼苗
低温胁迫
高温胁迫
光合速率
气孔导度
Eucalyptus urophylla×E.grandis seedlings
Low temperature stress
High temperature stress
Photosynthetic rate
Stomatal conductance
作者简介
周雪梦(1985-),女,广西玉林人,助理研究员,博士,从事森林生态学和植物功能研究;通信作者:温远光,教授,博士,从事森林生态学和恢复生态学研究。
