芽鳞是指叶特化或退化成鳞片状。鳞叶有三种类型:革质鳞叶,通常覆于芽的外侧,又称为芽鳞,如橡皮树、玉兰;肉质鳞叶,如贝母;膜质鳞叶,如姜的根状茎和荸荠球茎上的鳞叶。每朵花具芽鳞状托叶4-6枚,每层1枚,深褐色、革质,外面密被浅黄绿色。鳞片脱落后留下的芽鳞痕,因为无明显的节间,芽鳞痕密集,易于和叶痕区别,所以可以根据其判断枝条的年龄和年伸长量。
形态特征:常绿乔木,高可达5米,芽鳞密被白灰色丝光质短伏毛。
Description: Evergreen trees, up to 5 m high; bud-scales densely covered with grayish silky short hairs.
芽鳞通常落叶。花冠白色,或黄色到粉红色,到粉红色;子房无腺体。
Bud scales usually deciduous. Corolla white, or yellow blushed to pink, to pink; ovary eglandular.
为了探讨悬铃木冬芽休眠的机理,研究了悬铃木冬芽休眠过程中芽鳞及叶原基的内源激素变化与休眠的关系。
The relationship between dormancy and endogenous hormone inside buds scales and leaf primordium was studied in order to explore the mechanism of winter buds' dormancy in Platanus acerifolia.
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