Pritsa A and D. B Corresponding author; email: The aim was to investigate whether the seasonal fluctuations of these polyamines in different organs correlated to developmental processes such as floral differentiation, shoot growth, anthesis, fertilisation, and fruit growth. Samples were taken from trees of the large-fruited cultivar Chondrolia Chalkidikis and the small-fruited Koroneiki.
Published online Mar For Permissions, please email: The main goal of this study was to analyse the functional aspects of nectar secretion related to interaction with pollinators by evaluating floral biology, cellular and sub-cellular anatomy of the septal nectary and nectar composition of Ananas ananassoides, including an experimental approach to nectar dynamics.
Methods Observations on floral anthesis and visitors were conducted in a population of A.
Nectary samples were Floral anthesis using standard methods for light and transmission electron microscopy. The main metabolites in nectary tissue were detected via histochemistry.
Sugar composition was analysed by high-performance liquid chromatography HPLC. Key Results The hummingbirds Hylocharis chrysura and Thalurania glaucopis were the most frequent pollinators.
The interlocular septal nectary, composed of three lenticular canals, extends from the ovary base to the style base. It consists of a secretory epithelium and nectary parenchyma rich in starch grains, which are hydrolysed during nectar secretion. Conclusions The data suggest that the total production of floral nectar in A.
Nectar is the floral resource for hummingbirds and, in Bromeliaceae, it is produced by septal nectaries whose structure was described by Bernardello et al.
As noted by McDade and Weeksp. Given these considerations, Bromeliaceae—hummingbird interactions represent a good model by which we may increase our knowledge of features of both the plant and the pollinator in the nectar-mediated interaction.
Our focus was on the processes of nectar secretion including nectary characteristics, which could be informative in regard to the connection between nectar produced per flower and pollinator feeding behaviour. Fieldwork was conducted during two consecutive flowering seasons of A.
Flowering occurred at the beginning of the rainy season, spanning September to November and from September to October This terrestrial bromeliad has leathery leaves and spiral phyllotaxis; a floral scape of approx. Plant—pollinator interactions Floral morphology and events of anthesis were observed in ten plants, with emphasis on the opening time, colour of the floral elements, presence of nectar and floral longevity.
Flowers were monitored to check for visitors at different times of day throughout the season totalling 60 h of observation, from dawn h to evening h.
Some visitors were captured for identification, and others, such as hummingbirds, were identified by photographs and video. Histochemistry of septal nectaries from functional flowers of Ananas ananassoides Staining procedure.Floral biology and breeding system of Jatropha curcas in north- western India.
The study in relation to floral biology conducted at Ludhiana (central plain region of Punjab. We investigated floral anthesis in a male mulberry tree with high-speed video Anemophilous plants described as catapulting pollen explosively into the air have rarely attracted detailed examination.
Floral humidity plumes differ from ambient levels only during the ﬁrst 30 min after anthesis (before nectar is de- pleted in wild populations), whereas other ﬂoral traits (scent.
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S08e ultiaately change or differentiate into floral or fruit buds. It has been determined that flower induction (the time period during which Citrus flower buds can not be visibly recognized by shape and size. Recently, however, scientists in California were able to predict the presence of flowering initiativeblog.com anthesis.
Citru8 pollen is. An individual grape flower is shown with floral parts labeled. Photo by Patty Skinkis, Oregon State University. The period of time during which flowers are open (the calyptra has fallen) is called bloom (also flowering or anthesis), and can last from 1 to 3 weeks depending on weather conditions.