Journal of Plant Ecology

• • 上一篇    下一篇

  

  • 收稿日期:2020-12-02 修回日期:2021-02-06 接受日期:2021-06-06 出版日期:2022-02-01

Chilling rather than photoperiod controls budburst for gymnosperm species in subtropical China

Yuan-Qi Pan1,†, Xiu Zeng2,†, Wen-De Chen1, Xin-Ran Tang3, Kui Dai3, Yan-Jun Du3,* and Xi-Qiang Song3   

  1. 1 College of Tourism and Urban-Rural Planning, Chengdu University of Technology, Chengdu 610059, China, 2 College of Tropical Crops, Hainan University, Haikou 570228, China, 3 Key Laboratory of Genetics and Germplasm Innovation of Tropical Special Forest Trees and Ornamental Plants (Ministry of Education), College of Forestry, Hainan University, Haikou 570228, China

    *Corresponding author. E-mail: yanjundu1981@gmail.com
    †These authors contributed equally to this work.
  • Received:2020-12-02 Revised:2021-02-06 Accepted:2021-06-06 Online:2022-02-01

PDF (PC)

114

摘要：

低温而不是光周期调控中国亚热带裸子植物的出芽物候

摘要：被子植物春季物候的调控机制已经得到了广泛的研究。然而，裸子植物和被子植物在3亿年前就产生分化，裸子植物与被子植物的物候可能是受不同的因素所调控。亚热带植物物候的调节机制在很大程度上尚不明确，亚热带裸子植物物候是否由冷激需求和光照调控仍未得到验证。本研究在人工气候箱中设置了3个冷激处理和3 个光周期处理，并对切枝的出芽期进行了为期8周的研究。实验中我们测试了8种裸子植物：柳杉(Cryptomeria japonica)、杉木(Cunninghamia lanceolata)、柏树(Cupressus funebris)、银杏(Ginkgo biloba)、水杉(Metasequoia glyptostroboides)、马尾松(Pinus massoniana)、金钱 松(Pseudolarix amabilis)和罗汉松(Podocarpus macrophyllus)，检验其出芽物候是否对光周期敏感或者是否具有较强的冷激需求，以及这两种因素哪个对促进出芽更为重要。研究结果表明，对于裸子植物，冷 激促进了出芽并提高了出芽率，而且裸子植物需要适度的低温天数来实现出芽。有趣的是，在同一森 林中裸子植物比被子植物对积温的需求更高。与德国温带裸子植物(194–600 d · °C)相比，亚热带裸子植 物(814–1150 d · °C)对积温的需求更高。光周期对裸子植物出芽的影响较小，说明冷激对裸子植物出芽的 促进作用大于光周期。这些结果表明，随着全球气候持续变暖，冬季气温的升高不仅会影响亚热带被子植物也会影响裸子植物的物候，从而可能导致春季出芽期的延迟。

关键词: 冷激需求, 气候变化, 积温需求, 古田山, 春季物候, 切枝实验

Abstract:

The mechanisms regulating spring phenology have been extensively studied in angiosperm species. However, given that gymnosperms and angiosperms diverged 300 million years ago, phenology may be triggered by different cues in gymnosperm species. The regulatory mechanisms of phenology in subtropical regions remain largely unknown. In combination, it remains untested whether subtropical gymnosperm species have chilling requirements and are photosensitive. We conducted a climate chamber experiment with three chilling and three photoperiod treatments to investigate budburst during an 8-week forcing period. We tested whether budburst of eight gymnosperms species (Cryptomeria japonica, Cunninghamia lanceolata, Cupressus funebris, Ginkgo biloba, Metasequoia glyptostroboides, Pinus massoniana, Pseudolarix amabilis and Podocarpus macrophyllus) was photoperiod sensitive or has strong chilling requirements and whether photoperiod or chilling was more important for advancing budburst. Chilling advanced budburst and increased the percentage of budburst for gymnosperm species. Gymnosperm species required moderate chilling days to advance budburst. Interestingly, the forcing requirement for gymnosperm species was higher than that for angiosperms in the same forest, suggesting that gymnosperms may need more cumulative forcing to initiate budburst than do angiosperms. Compared with temperate gymnosperm species in Germany (194–600 °C days), the subtropical species studied here had a much higher forcing requirement (814–1150 °C days). The effects of photoperiod were minor, suggesting that chilling outweighs photoperiod in advancing budburst of gymnosperm species in this subtropical region. These results reveal that increased winter temperatures with continued global warming may impact not only angiosperms but also gymnosperms, leading to their delayed spring budburst.

Key words: chilling requirement, climate change, forcing requirement, Gutianshan, spring phenology, twig cutting experiment

Copyright ©2026 版权所有 《植物生态学报》编辑部
地址: 北京香山南辛村20号, 邮编: 100093
Tel.: 010-62836134, 62836138;　Fax: 010-82599431;　E-mail: apes@ibcas.ac.cn, cjpe@ibcas.ac.cn
网站备案号: 京ICP备16067583号-19