ISHS Acta Horticulturae 437: VII International Symposium on Pollination
SURFACE OF THE NECTARIES AND NECTAR PRODUCTION OF FOUR POMOIDEAE REPRESENTATIVES (ROSACEAE) |
| Authors: | E. Weryszko-Chmielewska, M. Masierowska, A. Konarska |
| Keywords: | nectary epidermis, nectar, sugars, Aronia, Chaenomeles, Cydonia, cuticle, stomata |
| Abstract:
The surface of the floral nectaries of 4 species: Aronia melanocarpa Ell., Chaenomeles japonica Ldl., Ch. speciosa Nakai and Cydonia oblonga Mill., was examined by means of scanning-electron and light microscopy. The amount of nectar secreted and its sugar concentration was determined for each species. Differences in ornamentation of cuticle and number and localization of stomata were observed among the species. In A. melanocarpa and Ch. speciosa the amount of nectar secreted and the quantity of sugar produced per 10 flowers was higher than in the other species. The surface of A. melanocarpa nectaries was smooth with a high density of stomata, whereas in Ch. speciosa the nectary cuticle was partially striated and the epidermis possessed a low density of stomata. Aronia had the smallest nectaries. Flowers of Ch. japonica produced the lowest nectar yield and the cuticle on their nectary surface was strongly undulated, with many perforations between striae, which were, probably, the places of nectar outflow; the nectary had a small stomatal density. Overall, no clear relationships between nectar yield or nectar-sugar production and either nectary size or density of nectary stomata could be established for these four species of Pomoideae. | |
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