The distribution and harm of species of dominant weeds of lawn vary with different area , and the most harmful weeds belong 8 families , which were poaceae , asteraceae , cyperaceae , amaranthaceae , euphorbiaceae , polygonaceae , fabaceae and caryophyllaceae , about accounted for from sixty percent to seventy percent in all weeds in lawn 摘要不同地区草坪优势杂草的种类不尽相同，禾本科、菊科、莎草科、苋科、大戟科、蓼科、豆科和石竹科等8个科的杂草种类和发生数量最多，约占杂草总数的60 % ~ 70 % 。
Formers has done enough fine reaserch works on prokaryotic ftsz , in this paper we try to find the evolutionary clew of its transfering from junior algae to senior plant by choosing the single - cell chlorophyta - chlamydomonas reinhardtii and gramineae poaceae - oryza sativa as the experiment material 前人已对原核生物中ftsz在结构功能、表达调控等方面作了细致深入的研究，本文选取了单细胞绿藻衣藻和禾本科植物水稻的ftsz蛋白进行研究对比，试图寻找ftsz蛋白是如何由低等藻类过渡到高等植物界的线索。
