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Titolo:
Formation of pseudowhorls in Peperomia verticillata (L.) A-Dietr. shoots exhibiting various phyllotactic patterns
Autore:
Kwiatkowska, D;
Indirizzi:
Univ Wroclaw, Inst Bot, PL-50328 Wroclaw, Poland Univ Wroclaw Wroclaw Poland PL-50328 Inst Bot, PL-50328 Wroclaw, Poland
Titolo Testata:
ANNALS OF BOTANY
fascicolo: 6, volume: 83, anno: 1999,
pagine: 675 - 685
SICI:
0305-7364(199906)83:6<675:FOPIPV>2.0.ZU;2-8
Fonte:
ISI
Lingua:
ENG
Soggetto:
HEDERA-HELIX L; APICAL MERISTEM; PRIMORDIA; INTERNODE; LAYER;
Keywords:
Peperomia verticillata; pseudowhorls; phyllotaxis; shoot apex;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
31
Recensione:
Indirizzi per estratti:
Indirizzo: Kwiatkowska, D Univ Wroclaw, Inst Bot, Kanonia 6-8, PL-50328 Wroclaw, Poland Univ Wroclaw Kanonia 6-8 Wroclaw Poland PL-50328 w, Poland
Citazione:
D. Kwiatkowska, "Formation of pseudowhorls in Peperomia verticillata (L.) A-Dietr. shoots exhibiting various phyllotactic patterns", ANN BOTANY, 83(6), 1999, pp. 675-685

Abstract

Pseudowhorls are composed of leaves attached at almost equal levels and separated by single fully elongated internodes. In Peperomia verticillata, pseudowhorls form regularly in shoots exhibiting both spiral and truly whorled patterns of phyllotaxis. In spiral systems, they are composed of successive leaves positioned on the ontogenetic helix. In whorled phyllotaxis, leaves of two adjacent whorls occur at almost the same level and this way form a pseudowhorl. The number of leaves per pseudowhorl depends on the type of phyllotactic pattern and also the system of primordia packing. In all the shoots, regardless of the type of phyllotaxis, the number of leaves per pseudowhorl equals the number of leaf primordia in physical contact with the apical dome. It is the same as the higher number in contact parastichy pairs in spiral patterns or the number of orthostichies in whorled phyllotaxis. The pseudowhorled pattern is already manifested in the arrangement of leaf primordia. In spiral and whorled phyllotaxis the plastochron ratio calculated for primordia or whorls belonging to adjacent pseudowhorls is always higher than that calculated for members of one pseudowhorl. Moreover, angular distances between primordia of one pseudowhorl in spiral patterns are more uniform than expected in Fibonacci phyllotaxis. These observations were madeon plants both growing in pots and cultured in vitro. 6-Benzylaminopurine,a synthetic cytokinin, added to the medium increases the mean number of leaves per pseudowhorl. It seems that this effect is indirect: phyllotaxis changes first rather than the destiny of a particular internode in a process of selective elongation. (C) 1999 Annals of Botany Company.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 14/07/20 alle ore 19:48:06