濒危植物川东灯台报春的种子休眠/萌发生理及出苗模式

唐安军*
重庆师范大学生命科学学院, 植物环境适应分子生物学重庆市重点实验室, 重庆401331

通信作者:唐安军;E-mail: tanganjun@mail.kib.ac.cn

摘 要:

川东灯台报春是一种绝迹百年而又被重新发现的濒危植物, 唯一的一个极小种群仅见于重庆城口县的大巴山。基于种子休眠/萌发对温度和光照的响应, 本文研究了川东灯台报春的出苗动态。新成熟的川东灯台报春种子是非深度生理休眠的。经60 d冷层积打破休眠的种子只有在光照和适宜的温度下才能顺利萌发。覆土能明显抑制种子萌发。种子的需光性可能有助于形成种子土壤种子库。当光照充分时, 种子野外的出苗高峰发生于4~6月。而且, 其出苗模式严格地受制于气温和降水的季节性变化格局。

关键词:濒危植物; 冷层积; 生理休眠; 种子萌发; 需光性种子; 川东灯台报春

收稿:2016-08-02   修定:2016-09-02

资助:重庆市自然科学基金(cstc2013jcyjA00002)和重庆市教委自然科学基金(KJ1400504)。

Dormancy/germination physiology and seedling emergence patterns of endangered Primula mallophylla (Primulaceae)

TANG An-Jun*
Chongqing Key Laboratory of Molecular Biology of Plant Environmental Adaptations, College of Life Sciences, Chongqing Normal University, Chongqing 401331, China

Corresponding author: TANG An-Jun; E-mail: tanganjun@mail.kib.ac.cn

Abstract:

The species of Primula mallophylla (Primulaceae), which had disappeared for almost 100 years and assumed extinct, was surprisingly rediscovered in 2006. The only extant extremely small population was found in the Daba Mountain of Chengkou County in northeast Chongqing, west China, implying that thorough investigation and conversation must be immediately conducted. On the basis of the dormancy/germination responses of seeds to temperature and light, the dynamics of seedling emergence of P. mallophylla was investigated in this study. Newly collected seeds were with non-deep physiological dormancy. The dormancy-broken seeds by 60 d cold stratification (5°C) could germinate well only under the combination of light and appropriate temperatures. Soil cover significantly inhibited the germination of this species. The seeds were demonstrated to have a light requirement even after experiencing moist chilling, which might facilitate the incorporation of the seeds into the soil seed bank. In the field where illumination was fully provided, the seasonal patterns of seedling emergence with a peak between April and June was enslaved to the seasonal change trend of both temperature and precipitation in this subalpine region.

Key words: endangered plants; cold stratification; physiological dormancy; seed germination; light-requiring seeds; Primula mallophylla

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