GERMINATION ECOPHYSIOLOGY OF HYDROPHYLLUM APPENDICULATUM, A MESIC FOREST BIENNIAL
GERMINATION ECOPHYSIOLOGY OF HYDROPHYLLUM APPENDICULATUM, A MESIC FOREST BIENNIAL
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DOI：
10.1002/j.1537-2197.1985.tb08283.x
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发表时间：
1985-02
影响因子：
3
通讯作者：
J. Baskin;C. Baskin
中科院分区：
文献类型：
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作者：
J. Baskin;C. Baskin
在肯塔基州中北部，中温带森林二年生植物Hydrophyllum appentliculatum. Michx.，在六月成熟时会休眠在自然和模拟季节温度变化下，休眠的解除分两个阶段进行。根休眠被夏季高温打破，芽休眠被冬季低温打破。因此，种子在秋天生根，次年春天子叶出现。90天的温暖（30/15 C）层积处理打破根休眠，但根出现后，才转移到较低的温度。在温暖层积处理后，分别有93%、73%、6%和9%的种子在5、15/6、20/10和30/15 ℃（12/12小时）下孵育。在20/10 ℃下，对具有出苗的根的种子进行0、28、56和84天的冷（5 ℃）层积分别导致9、21、49和82%的子叶出苗。因此，H. apapriculatum表现出一种称为上胚轴休眠的形态生理休眠。虽然许多种子在第一年发芽，但其他种子保持休眠，并在连续几年发芽，直到成熟后的第四个季节。
In north central Kentucky, seeds of the mesic forest biennial Hydrophyllum appentliculatum .Michx., are innately dormant at maturity in June. Under natunl and simulated seasonal temperature changes, dormancy break occurred in two stages. Root dormancy was broken by high summer temperatures, and shoot dormancy was broken by low winter temperatures. Consequently, roots emerged from seeds during autumn, and cotyledons emerged the following spring. A 90-day warm (30/15 C) stratification treatment broke root dormancy, but the roots emerged only after transfer to lower temperatures. After the warm stratification treatment, roots emerged from 93, 73, 6 and 9% of the seeds incubated at 5, 15/6, 20/10 and 30/15 C (12/12 hr), respectively. Zero, 28, 56 and 84 days of cold (5 C) stratification of seeds with emerged roots resulted in 9, 21, 49 and 82% cotyledon emergence, respectively, at 20/10 C. Thus, H. appendiculatum exhibits a type of morpho-physiological dormancy known as epicotyl dormancy. Although many seeds germinate the first year, others remain dormant and germinate in successive years until the fourth season after ripening.