商业 来源:互联网 时间:2023-05-10 00:47:53
(资料图片)
叶在茎枝上无论以哪一种方式排列,相邻两节的叶子彼此成一定的角度镶嵌着生,互不重叠,称叶镶嵌( leaf mosaic)。叶镶嵌主要是由于叶柄的长短、扭曲和叶片的各种排列角度,形成叶片互不遮蔽。从植株的顶面看去,叶镶嵌的现象格外清楚,特别是节间极短而有较多的叶簇生在茎上的种类,叶镶嵌现象特别明显,如烟草、车前、蒲公英等。叶镶嵌使茎上的叶片不相遮蔽,有利于光合作用的进行。此外,叶片的均匀排列,也使茎上各侧的负载量得到平衡。
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