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草业学报 ›› 2026, Vol. 35 ›› Issue (7): 165-174.DOI: 10.11686/cyxb2025373

• 研究论文 • 上一篇    

藏东南山地特有种杂色钟报春种子萌发的生态适应策略

陈娜1(), 覃滢卜1, 彭德力1,2()   

  1. 1.云南师范大学生命科学学院,云南 昆明 650500
    2.云南师范大学生物质能可持续发展与利用教育部工程研究中心,云南 昆明 650500
  • 收稿日期:2025-09-15 修回日期:2025-10-16 出版日期:2026-07-20 发布日期:2026-05-21
  • 通讯作者: 彭德力
  • 作者简介:Corresponding author. E-mail: pengdeli@ynnu.edu.cn
    陈娜(2000-),女,云南昭通人,在读硕士。E-mail: 2012828189@qq.com
  • 基金资助:
    国家自然科学基金项目(32060079)

Ecological adaptation strategies of seed germination in Primula alpicola, an endemic alpine species in the southeastern Xizang Plateau

Na CHEN1(), Ying-bo QIN1, De-li PENG1,2()   

  1. 1.School of Life Science,Yunnan Normal University,Kunming 650500,China
    2.Engineering Research Center of Sustainable Development and Utilization of Biomass Energy,Ministry of Education,Yunnan Normal University,Kunming 650500,China
  • Received:2025-09-15 Revised:2025-10-16 Online:2026-07-20 Published:2026-05-21
  • Contact: De-li PENG

摘要:

以藏东南山地特有种杂色钟报春为试验对象,系统探究了其种子休眠与萌发特性。通过外源赤霉素(GA3)添加、干燥后熟和低温层积处理研究种子休眠解除方法,并分析了休眠解除过程中种子萌发对不同温度(恒温:1、5、10、15、20、25、30 ℃;变温:5 ℃/1 ℃、15 ℃/5 ℃、25 ℃/15 ℃)和光照条件(12 h光照/12 h黑暗和持续黑暗)的响应。结果表明:新成熟种子萌发需要较高温度(>20 ℃),在低温(1~15 ℃)下萌发率显著降低,且萌发对光照有明显需求,尤其在低温条件下,而且添加外源GA3能显著促进萌发。干燥后熟与低温层积均能有效打破种子初始休眠,但是低温层积效果更佳。随着休眠逐渐解除,种子萌发的温度范围变宽(5~30 ℃),基础萌发温度(Tb)逐渐降低,从-2.092 ℃(低温层积3个月)降至-4.035 ℃(低温层积6个月),而萌发最适温度(To)和最高温度(Tc)无明显变化。休眠解除后,种子萌发对光照的需求降低。本研究证实杂色钟报春种子在成熟散播时具有2型浅型生理休眠。初始萌发依赖于较高温度,环境条件不满足时表现为条件休眠。越冬过程逐渐解除休眠,使种子获得在较低温度下萌发的能力,从而能在春季融雪后快速萌发,延长幼苗生长季,提高存活率。这种萌发行为是高山植物对短生长季环境的关键适应策略。

关键词: 杂色钟报春, 休眠, 萌发, 低温层积, 干燥后熟

Abstract:

This study investigated the seed dormancy and germination ecology of Primula alpicola, an endemic alpine species from southeastern Xizang, to understand its adaptive strategies in alpine environments. The scientific problem addressed was the germination constraints faced by seeds in cold climates with short growing seasons. We aimed to determine the type of seed dormancy and evaluate how environmental factors such as temperature, light, gibberellin (GA3), dry after-ripening, and cold stratification affect dormancy release and germination. Experiments tested the effects of exogenous GA3, dry after-ripening, and cold stratification on breaking dormancy, along with germination responses under various temperature regimes (constant: 1, 5, 10, 15, 20, 25, and 30 ℃; alternating: 5 ℃/1 ℃, 15 ℃/5 ℃, 25 ℃/15 ℃) and light conditions (12 hours light/12 hours dark vs. continuous darkness). Results showed that fresh seeds exhibited non-deep physiological dormancy (type 2), requiring temperatures above 20 ℃ for germination, which was strongly light-dependent, especially at low temperatures. GA3 significantly promoted germination, both dry after-ripening and cold stratification alleviated dormancy, with cold stratification being more effective. As dormancy was released, the germination temperature range widened (5-30 ℃), the base germination temperature (Tb) decreased from -2.092 ℃ (after 3 months cold stratification) to -4.035 ℃ (after 6 months), while the optimal (To) and ceiling (Tc) temperatures remained unchanged, and light dependence diminished. These findings indicate that P. alpicola seeds initially rely on high temperatures for germination, with unfavorable conditions inducing conditional dormancy. Overwintering dormancy loss enables germination at lower temperatures, facilitating rapid seedling establishment after snowmelt. This strategy prolongs the growth period and enhances survival, representing a key adaptation to short alpine growing seasons.

Key words: Primula alpicola, dormancy, germination, cold stratification, dry after-ripening