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Ecophysiological aspects of nectar reabsorption

100%

Stpiczynska M., Nepi M.

Acta Agrobotanica

2006

tom 59

nr 1

A number of approaches, both direct and indirect, have shown that nectar is reabsorbed by numerous plant species, irrespective of the age or sex of the flower. Furthermore, reabsorption occurs regardless of whether or not the flower has been pollinated. Reabsorption helps to maintain concentration of nectar and their viscosity and thereby encourages continued visits by pollinators. Conversely, the capacity to vary concentration of nectar sugars may confer evolutionary advantage by encouraging visits by more than one kind of pollinator and this is particularly important in regions where there is a paucity of pollinators. A further important role of nectar reabsorption is the maintenance of the energy equilibrium of the plant. A number of studies have shown that nectar production involves considerable energy expenditure requiring as much as 37% of the plant's daily production of energy by photosynthesis. The increased metabolic costs incurred by the plant during nectar production and secretion can reduce its growth and reproduction during the following season. Reabsorption of nectar that has not been collected by pollinators enables the plant to conserve at least some of the energy reserved for the secretion of nectar. Sugars reabsorbed from nectar can be re-used for the development of fruit and ovules - processes which demand large quantities of sugar. Despite convincing evidence for the reabsorption of nectar, few detailed studies have addressed the transport and incorporation of reabsorbed sugars. One of the questions that remain to be answered is 'What is the cellular basis for nectar reabsorption by the nectary?'.

Studies on N-metabolism in different gastrointestinal sections of sheep using the digesta exchange technique. 3. N secretion and reabsorption

100%

Sandek A., Krawielitzki K., Kowalczyk J., Kreienbring F., Gabel M., Schonhusen U., Zebrowska T., Hagemeister H., Voigt J.

Journal of Animal and Feed Sciences

2002

tom 11

nr 2

Renal function during metabolic acidosis

84%

Kurpinska A. K., Skrzypczak W. F.

Journal of Pre-Clinical and Clinical Research

2010

tom 04

nr 1

Ograniczanie wyników

1 Acta Agrobotanica

1 Journal of Animal and Feed Sciences

1 Journal of Pre-Clinical and Clinical Research

1 Gabel M.

1 Hagemeister H.

1 Kowalczyk J.

1 Krawielitzki K.

1 Kreienbring F.

1 Kurpinska A. K.

1 Nepi M.

1 Sandek A.

1 Schonhusen U.

1 Skrzypczak W. F.

1 Stpiczynska M.

1 Voigt J.

1 Zebrowska T.

1 2010

1 2006

1 2002

Wyniki wyszukiwania

Ecophysiological aspects of nectar reabsorption

Studies on N-metabolism in different gastrointestinal sections of sheep using the digesta exchange technique. 3. N secretion and reabsorption

Renal function during metabolic acidosis