Department of Biological Science, Tohoku University, Kawauchi, Sendai 980, Japan.
Plant Physiol. 1977 Feb;59(2):122-5. doi: 10.1104/pp.59.2.122.
Dormant seeds of cocklebur (Xanthium pennsylvanicum Wallr.) were characterized by the lack of ability to form chlorophyll. Such an inability of cotyledons of the dormant seeds was improved by the application of various factors and reagents which were capable of breaking the dormancy and of increasing cotyledon enlargement. Of these, ethylene, benzyladenine, and high temperature treatments were particularly effective, and, in turn, oxygen enrichment, gibberellic acid, thiourea, carbon doxide, and potassium nitrate were also promotive to the greening of the dormant cotyledons. The effects of benzyladenine, oxygen enrichment, and high temperature were reduced in the presence of absorbents for endogenously evolve carbon dioxide and ethylene. delta-Aminolevulinic acid could not restore their greening ability.
苍耳（Xanthium pennsylvanicum Wallr.）的休眠种子的特点是缺乏形成叶绿素的能力。通过应用各种能够打破休眠并增加子叶扩大的因素和试剂，可以改善休眠种子的子叶的这种无能。其中，乙烯、苄基腺嘌呤和高温处理特别有效，而氧气富集、赤霉素、硫脲、二氧化碳和硝酸钾也有利于休眠子叶的变绿。在存在内源产生的二氧化碳和乙烯的吸收剂的情况下，苄基腺嘌呤、氧气富集和高温的作用会降低。δ-氨基酮戊酸不能恢复它们的变绿能力。
