Artículos de revistas
Cleistogamy in the rare high Andean perennial herb Cryptantha capituliflora (Boraginaceae)
Fecha
2003-03Registro en:
Calviño, Ana Alejandra; Galetto, Leonardo; Cleistogamy in the rare high Andean perennial herb Cryptantha capituliflora (Boraginaceae); Springer Wien; Plant Systematics and Evolution; 237; 1-2; 3-2003; 41-50
0378-2697
1615-6110
CONICET Digital
CONICET
Autor
Calviño, Ana Alejandra
Galetto, Leonardo
Resumen
Axial and apical flowers of Cryptantha capituliflora were analyzed with regard to morphology and pollen tube growth to assess the occurrence of cleistogamy. Although intermediate floral forms do occur, cleistogamous flowers were significantly smaller than chasmogamous flowers, had fewer anthers, and showed a distinctive stigmatic surface. Chasmogamous flowers can be cross-pollinated. Nevertheless, the growth of self-pollen tubes in few chasmogamous buds jointly with flower characters suggests that these flowers can probably produce fruits through autonomous selfing. The mean seed number per fruit did not differ between fruits from chasmogamous and cleistogamous flowers. Cleistogamous flowers were only observed in axial inflorescences, which are completely covered by the leaf. Other species of section Cryptantha also show the same trend, with cleistogamous flowers located in the lower half of the stems. This pattern is discussed in relation to dissimilarities in the outcrossing opportunities between flower types within the plant.