摘要:

The sporophyte–gametophyte interface in culturedLycopodium appressumgametophytes consists of a sporophytic foot embedded in gametophyte tissue. Foot cells and contiguous gametophytic cells develop extensive wall ingrowths, making them transfer cells. Transfer cells in the foot of young sporophytes and in adjacent gametophyte cells have elongated, narrow wall ingrowths forming a labrynthine wall–membrane apparatus, numerous mitochondria, and plastids with variable amounts of starch. Transfer cells in older interfaces have thickened wall ingrowths, few mitochondria, plastids with numerous plastoglobuli and little starch, and a large central vacuole. Plasmodesmata do not develop between cells of sporophyte and gametophyte generations and these are, therefore, isolated symplastically during all stages of sporophyte development.Key words:Lycopodium, foot, haustorium, transfer cells, ultrastructure.

ISSN:0008-4026    

DOI:10.1139/b91-031

出版商:NRC Research Press    

年代:1991

数据来源: NRC

摘要:

Cuttings ofTrifolium repenswere grown in pots without neighbours. When individual interconnected stolons from these cuttings were directed into adjacent pots so that daughter ramets were growing with different grass neighbours, these neighbouring grasses had dissimilar effects on leaf number, leaf size, percent branching of nodes, stolon length, and shoot dry weight. When theT.repenscuttings were grown in pots with neighbours, the effects of different grass neighbours on subsequent growth of stolons and ramets evened out.Key words: integration, clone, ramet, neighbour effects,Trifolium repens.

ISSN:0008-4026    

DOI:10.1139/b91-032

出版商:NRC Research Press    

年代:1991

数据来源: NRC