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vegetation
>
Sector outgrowth doctrine
部分枝条学说
partial-shoot theory
a.a rber(1930)所创立的有关叶的生物学位置的学说,可看做是茎、叶的概念不能分开理解的所谓萨克斯(j.sachs, 1875)观点的发展。根据高等植物的植物体是根茎的统一体(root and sho-ot complex)这种见解,则枝条每一分枝的世代是不同的。虽然叶本应是成为部分的枝条,但也可被解释为未完成枝条性质的部分,不具有如顶枝学说(telome theory)那种系统学的意义。