增粗生长 growth in thickness,thichening growth

互联网2013-11-14

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增粗生长 growth in thickness,thichening growth亦称次生增粗生长（secondary thickening growth）或次生生长（secondary growth），即植物的茎、根的直径往粗增长。初生生长是靠根、茎顶端分裂组织伸长生长及各细胞的伸长，而次生增粗生长则是由于形成层形成新的木质部和靭皮部造成的，因此只要形成层具有分裂能力，则增粗生长也就得以长期继续下去。古蕨类、裸子植物、木本双子叶植物、单子叶植物的某些种类都具有这种生长。

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