Anatomische Untersuchungen an der Blattspreite bei Allium L. (Alliaceae) I. Arten mit einer einfachen Leitbündelreihe
1988; Elsevier BV; Volume: 181; Issue: 1-2 Linguagem: Inglês
10.1016/s0367-2530(17)30354-7
ISSN1618-0585
Autores Tópico(s)Plant Reproductive Biology
ResumoMost of the species of this group are distinguished by a character's syndrom (named here "typ 1"): subepidermal lactifers, palisade mesophyll absent (or if present it seems to be secondarily evolved from spongy mesophyll), and a spongy mesophyll of various cell forms which could have been derived from ancestral many- and short-armed, long cells. All analyzed species of the American sections of subg. Amerallium sensu Traub 1968 belong to this group and represent a rather derived evolutionary line, whereas the Eurasian sections Molium, Xanthoprason, Chamaeprason, Narkissoprason, and Briseis are mostly less differentiated. But sect. Arctoprasum (A. ursinum) and genus (or sect., subg.) Nectaroscordum seem to represent rather isolated evolutionary sub-lines. The analyzed species of subg. Bromatorrhiza belong partly to "typ 1" (A.fasciculatum, A. hookeri). The other species A. cyathophorum var. farreri, A. mairei, and A. amabile possess a true palisade mesophyll and intraparenchy-matic lactifers. That combination of characters is named "typ 2" and seems to be the ancestral one from which the evolution could have been gone to the "type 1" syndrome as well as to the other groups of genus Allium having a circle or two opposedly orientated rows of vascular bundles in the leaf blade.
Referência(s)