Morphological differences and changes of the gynoecium in short-lived flowers of Rosa setigera Michaux and their relationship to dioecy

Rosa setigera is unique within the genus because the plant is cryptically dioecious, the flowers of male and female plants appearing identical. Flowers produce no nectar, and the plants rely upon insects, which feed on or collect pollen, for pollination. The plants' gynoecia in both sexes are e...

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Bibliographic Details
Published in:International journal of plant sciences 1993-12, Vol.154 (4), p.550-556
Main Authors: Kemp, J.R, Kevan, P.G, Posluszny, U
Format: Article
Language:English
Subjects:
ANATOMIA DE LA PLANTA
ANATOMIE VEGETALE
Animal and plant ecology
Animal, plant and microbial ecology
Autoecology
Biological and medical sciences
BIOLOGICAL DEVELOPMENT
DESARROLLO BIOLOGICO
DEVELOPPEMENT BIOLOGIQUE
Dioecy
Flower stigma
Flowers
Flowers & plants
Fundamental and applied biological sciences. Psychology
GINECEO
GYNECEE
GYNOECIUM
Male animals
Ovaries
Ovules
PLANT ANATOMY
PLANT MORPHOLOGY
Plant reproduction
Plants
Plants and fungi
Pollen
Reproduction
ROSA
ROSA (GENERO)
SEX
SEXE
SEXO
Single status
STIGMA
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Summary:Rosa setigera is unique within the genus because the plant is cryptically dioecious, the flowers of male and female plants appearing identical. Flowers produce no nectar, and the plants rely upon insects, which feed on or collect pollen, for pollination. The plants' gynoecia in both sexes are extremely similar; however, overall the synstigmatic length, synstylar length, ovary length, ovule length, and ovule width are greater in flowers of female plants than in flowers of male plants. Only the single stigma width of male plants was found to be greater than that of female plants. Furthermore, ovary volume, ovary width, ovule length, ovule width, and ovule volume in flowers of female plants increase over the period of 4 d of a flower's life (i.e., with petals), whereas in flowers of male plants those characters either decrease or remain relatively constant over the 4-d time period. No overall differences in synstigmatic width, synstylar width, single stigma length, synstigmatic area, and ovary width were found. The results indicate that dioecy may be a relatively recent occurrence in this species.
ISSN:1058-5893
1537-5315
DOI:10.1086/297137