Effectiveness of freezing temperatures on dormancy release of temperate woody species

作者：Huanjiong Wang, Wenrui Bai, Zhi Hu, Shaozhi Lin, Quansheng Ge · 发表于：Annals of Botany · 年份：2024 · DOI：10.1093/aob/mcae112 · 被引用次数：9 · 研究领域：Plant Physiology and Cultivation Studies、Plant Reproductive Biology、Tree Root and Stability Studies

BACKGROUND AND AIMS: Spring phenological change of plants in response to global warming may affect many ecological processes and functions. Chilling temperature regulates budburst date by releasing dormancy. However, whether freezing temperatures (<0 °C) contribute to dormancy release remains of debate. Our poor understanding of the role of chilling makes estimating shifts in budburst date difficult. METHODS: A 2-year chilling-forcing experiment was explicitly designed to test the effects of chilling temperatures on dormancy release of nine temperate woody species in Beijing, China. A total of 1620 twigs were first exposed to a wide range of temperatures (-10 to 10 °C) with different durations and then moved to growth chambers. Based on budburst data in experimental conditions, we examined whether freezing temperatures are effective on dormancy release. We also developed a new framework for constructing chilling functions based on the curve between chilling duration and forcing requirement (FR) of budburst. The chilling function derived from this framework was not affected by experimental forcing conditions. KEY RESULTS: We demonstrated that freezing temperatures down to -10 °C were effective in dormancy release. The rate of dormancy release, indicated by the rate of decay in the chilling duration-FR curve, did not differ significantly between chilling temperatures in most cases, although it exhibited a maximum value at 0 or 5 °C. The chilling function-associated phenological...