Germination Ecophysiology of Eastern Deciduous Forest Herbs: Hydrophyllum macrophyllum
Germination Ecophysiology of Eastern Deciduous Forest Herbs: Hydrophyllum macrophyllum
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DOI：
10.2307/2425516
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发表时间：
1983
影响因子：
0.6
通讯作者：
J. Baskin;C. Baskin
中科院分区：
文献类型：
--
作者：
J. Baskin;C. Baskin
大叶水螅（Hydrophyllaceae）是一种草本多果多年生植物，存在于从西弗吉尼亚和西弗吉尼亚到伊利诺斯州以及南到格鲁吉亚、亚拉巴马和阿肯色州的中生落叶林中。七月中下旬种子成熟和传播时，种子表现出根和芽的休眠。需要高温来打破根休眠，在实验室中，77- 85%的种子在30/15 ℃的每日12/12小时的温度周期下进行2-4周的温暖处理后，在15/6 ℃的每日12/12小时的温度周期下产生根。在自然栖息地，夏季和初秋根系休眠被打破，秋末根系从种子中长出。根出现后，需要冷却来打破芽休眠; 100%的种子（具有出现的根）在5 ℃冷却6周后在20/10 ℃下产生芽。在自然栖息地，芽休眠在冬季被打破，并在冬末和早春产生芽。在某一年的种子作物中，一部分种子的发芽可能会推迟几年。根出现从种子保持在土壤中的落叶层在不加热的温室发生在第一，第二和第三个秋天种植新鲜成熟的种子。
Hydrophyllum macrophyllum Nutt. (Hydrophyllaceae) is an herbaceous polycarpic perennial that occurs in mesic deciduous forests from western Virginia and West Virginia, to Illinois, and S to Georgia, Alabama and Arkansas. At the time of seed maturation and dispersal in midto late July, seeds exhibit both root and shoot dormancy. High temperatures are required to break root dormancy, and in the laboratory 77-85 %o of the seeds produced roots at a 12/12 hr daily thermoperiod of 15/6 C following a 2-4-week warm treatment at a 12/12 hr daily thermoperiod of 30/15 C. In the natural habitat, root dormancy is broken during summer and early autumn and roots emerge from the seeds in late autumn. After root emergence, chilling is required to break shoot dormancy; 100'% of the seeds (with emergent roots) produced shoots at 20/10 C after they were chilled at 5 C for 6 weeks. In the natural habitat, shoot dormancy is broken during winter and shoots are produced in late winter and early spring. Germination of a portion of the seeds in a given year's seed crop may be delayed for several years. Root emergence from seeds kept on soil under leaf litter in an unheated greenhouse occurred during the first, second and third autumns following planting of freshly matured seeds.