瓦形细胞在广义锦葵科中的分布及其系统学意义  

Tile cells:their occurrence and systematic implications in Malvaceae s.l.

作　　者：唐亚[1] 谢嘉穗[1] 高辉[1] 孙辉[1] 

机构地区：[1]四川大学环境科学与工程系,四川成都610065

出　　处：《广西植物》2005年第5期441-446,i0006,共7页Guihaia

基　　金：国家自然科学基金(30170074);教育部振兴计划资助~~

摘　　要：基于文献和作者的研究,该文讨论了瓦形细胞的识别、类型、变异及在广义锦葵科中的分布及其系统学意义。瓦形细胞是一种特殊射线细胞,呈不定的横列,常分散在横卧细胞之间,常无细胞内含物,其宽度远比横卧细胞为小,根据瓦形细胞与横卧细胞高度、宽度的相对大小,分为榴莲型、中间型和翅子树型3种类型,目前为止仅在广义锦葵科9个亚科中的7亚科39个现存属和5个化石属中发现;榴莲型、翅子树型和中间型瓦形细胞分别在22、20和5个属中发现,具有中间型的属同时具有榴莲型或/和翅子树型。仅翅子树型和中间型瓦形细胞在化石中发现,榴莲型可能比翅子树型古老。瓦形细胞在广义锦葵科中的分布,对研究一些类群的系统发育有意义。Based on literature and our own study,the identification, types,variation and systematic implieations of tile cells in Malvaceae s. l. are discussed in the present paper. Tile cells are a special type of ray cells occurring in both extant plants and fossil wood of Malvaceae s. l. and are usually in indeterminate horizontal, series and interspersed in procumbent cells. Tile cells differ from other ray cells in their shape,size,position in rays and usually absence of darkly stained contents. Based mainly on comparative height and width of tile cells and procumbent cells,three types of tile cells,Durio type, intermediate type and Pterospermurn type,are recognized. Tile cells are found in 39 extant and 5 fossil genera in 6 of the 9 subfamilies of the Malvaceae s. l. ,with 12 genera in subfamily Grewioideae and 9 in Helicteroideae. The Durio type is found in 22,Pterospermum in 21 ,and intermediate in 5 extant genera. The genera with the intermediate type have also Durio and/or Pterospermum type and no single genus has only the intermediate type of tile cells. Only the Pterosperrnum and intermediate types of tile cells are found in fossils. The Durio type has not been reported yet. The Pterospermum type of tile cells is thought to be derived from the Durio type of tile cells. Occurrence and distribution of tile cells in Malvaceae s. l. is helpful to phylogenetic study of some taxa of the family.

关 键 词：瓦形细胞 类型 分布 系统学意义 锦葵目 

分 类 号：Q942[生物学—植物学]