Diurnal and seasonal dynamics of nectar secretion of some species in the family Lamiaceae
1998
Macukanovic, M. | Blazencic, Z. (Faculty of Veterinary Medicine, Belgrade (Yugoslavia). Department of Botany)
Results obtained during evaluation of diurnal and seasonal variations of nectar secretion of Ballota nigra, Prunella vulgaris and Lamium album during the period from June to September, 1997 in the region of Belgrade (Yugoslavia) showed that nectar production is a complex physiological process variable due to species-specific characteristics and depending to a great extent upon the environment conditions present in habitats. Nectar secretion increased from morning to afternoon when conditions for plant development were optimal (sunny, warm, rainless and windless weather) while a decrease in relative air humidity allowed maximal nectar secretion between 12 and 2 p.m. in all monitored plants. Nectar secretion decreased in cloudy rainy and windy weather. Dependence of nectar secretion on the period of anthesis was established, since plants secreted more nectar at the beginning and during massive flower formation (June-August) than at the end of the anthesis (September). The highest nectar production per day and per flower was estimated in Prunella vulgaris, while Lamium album showed the lowest production among the monitored plants.
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