INVESTIGADORES
GIUSSANI Liliana Monica
artículos
Título:
Morphological variation associated with the environment in four dioecious Patagonian Poa species. The Poa rigidifolia complex”.
Autor/es:
GIUSSANI L. M.; MARTINEZ, A. J.; COLLANTES M. B
Revista:
CANADIAN JOURNAL OF BOTANY
Referencias:
Año: 1996 vol. 74 p. 762 - 772
ISSN:
0008-4026
Resumen:
A numerical taxonomic analysis on male and female plants of four Patagonian native Poa species: Poa rigidifolia Steud., P. ibari Phil., P. dusenii Hack. and P. spicaeformis (Steud.) Hauman et Parodi collected at the Province of Santa Cruz, Argentina, was carried out. Due to the clear dimorphism found between sexes, morphological analysis was performed separately on male and female specimens. Only two possible taxa, that are strongly associated with a pattern of environmental variability, were recognized: Group I, formed by specimens from subhumid localities, and Group II made up by those from xeric localities. Comparison between male and female classifications has shown a low agreement in terms of cophenetic correlation coefficient. Female groups were mainly separated by the position of hairs on the floret, blade thickness, sheath length and stomata size. On the other hand male groups were not so conspicuous and could distinguished by anther size, spikelet length, number of flowers per spikelet and blade width. Morphological female variation agreed partially with a former classification (Nicora, 1978). As a result of this study the four species were grouped into the P. rigidifolia complex until further experimental studies confirm their taxonomic rank.