Nectaries and Nectar
Edited by Nicolson, Susan W.; Nepi, Massimo; Pacini, Ettore
Nectar is the most important reward offered by plants to pollinating animals. This book is a modern and
interdisciplinary text on nectar and nectaries, prompted by the expansion of knowledge, especially in the
more ecological and now molecular fields, and the strong recent interest in pollination biology. The topics
covered vary widely: they include historical aspects, the structure and ultrastructure of nectaries and
relationships to plant systematics, the dynamics of nectar secretion, nectar chemistry and the molecular
biology of defence proteins, adaptations to insect and vertebrate nectar consumers and consequences for
pollination ecology, and broad-scale studies of nectar resources at the community level.
Hardcover 395 pp ISBN 9781402059360
Of interest to scientists and students involved in the different approaches to plant reproductive biology and
1. Introduction; E. Pacini, S.W. Nicolson. 1.1 Evolutionary origins. 1.2 Secretions analogous to nectar.
1.3 Floral and extrafloral nectarines. 1.4 Nectar components. 1.5 Organization of this volume.
2. A Systematic Survey of Floral Nectaries; G. Bernardello. 2.1 Introduction. 2.2 Nectaries in gymnosperms.
2.3 Nectaries in angiosperms. 2.3.1 Diversity. 126.96.36.199 Nectar presentation. 188.8.131.52 Structure. 184.108.40.206
Fate. 220.127.116.11 Symmetry. 18.104.22.168 Number. 22.214.171.124 Colour. 2.3.2 Factors influencing nectary diversity.
2.3.3 Basic types of floral nectarines. 2.3.4 Nectariferous spurs. 2.3.5 Patterns of variability in nectarines.
126.96.36.199 Asteraceae. 188.8.131.52 Brassicaceae. 184.108.40.206 Cucurbitaceae. 220.127.116.11 Euphorbiaceae. 18.104.22.168
Ranunculaceae. 22.214.171.124 Solanaceae. 2.3.6 Nectaries and deceit pollination. 126.96.36.199 Apocynaceae.
188.8.131.52 Bignoniaceae. 184.108.40.206 Orchidaceae. 2.3.7 Relictual nectarines in anemophilous species.
2.3.8 Distribution of nectary types. 220.127.116.11 Early-branching lineages. 18.104.22.168 Magnoliids.
22.214.171.124 Early-branching monocots. 126.96.36.199 Monocots. 188.8.131.52 Commelinids. 184.108.40.206 Ceratophyllales.
220.127.116.11 Eudicots. 18.104.22.168 Core Eudicots. 22.214.171.124 Rosids. 126.96.36.199 Eurosids I. 188.8.131.52 Eurosids II. 2.3.8.
12 Asterids. 184.108.40.206 Euasterids I. 220.127.116.11 Euasterids II. 2.3.9 Evolutionary trends.
3. Nectary Structure and Ultrastructure; M. Nepi. 3.1 Introduction. 3.2 Nectary structure and ultrastructure.
3.2.1 Epidermis. 18.104.22.168 Secretory trichomes. 22.214.171.124 Nectary-modified stomata. 3.2.2 Nectary parenchyma.
126.96.36.199 Patterns of plastid development in nectary parenchyma cells. 3.2.3 Subnectary parenchyma.
3.2.4 Nectary vasculature. 3.3 Gynopleural (septal) nectarines. 3.4 Extrafloral nectarines.
3.5 Nectary histochemistry.
4. Nectar Production and Presentation; E. Pacini, M. Nepi. 4.1 Introduction.
4.2 Nectar secretion mechanism and models of nectary function.
4.3 Dynamics of nectar components. 4.3.1 Nectar reabsortion: resource recovery and homeostasis.
4.3.2 Nectar standing crop. 4.4 The source of nectar components.
4.5 Ecophysiological significance of parenchyma plastids. 4.6 Nectar presentation.
4.6.1 Floral nectarines. 4.6.2 Extrafloral nectarines. 4.7 Fate of nectar and nectarines.
4.8 Variability of nectar characteristics. 4.8.1 Environmental variables. 4.8.2 Intraspecies variability.
4.8.3 Interpopulation differences. 4.8.4 Variability and experimental design.
5. Nectar Chemistry; S.W. Nicolson, R.W. Thornburg. 5.1 Introduction. 5.2 Water. 5.2.1 Nectar concentration.
5.2.2 Chemical and microclimatic influences on nectar concentration. 5.2.3 Viscosity and feeding rates.
5.3 Sugars. 5.3.1 Constancy of sugar composition within species. 5.3.2 The use of sugar ratios can be misleading.
5.3.3 Is sugar composition determined by floral visitors or common ancestry? 5.4 Inorganic ions.
5.5 Amino acids. 5.5.1 Non-protein amino acids. 5.5.2 Nectar amino acids are under the control
of environmental factors. 5.5.3 Contribution of amino acids to the taste of nectar. 5.6 Proteins.
5.6.1 Proteins in leek nectar. 5.6.2 Nectar redox cycle. 5.7 Other nectar constituents. 5.7.1 Lipids.
5.7.2 Organic acids. 5.7.3 Phenolics. 5.7.4 Alkaloids. 5.7.5 Terpenoids. 5.8 Conclusion.
6. Molecular Biology of the Nicotiana Floral Nectary; R.W. Thornburg. 6.1 Introduction.
6.2 The ornamental tobacco nectary. 6.3 Developmental processes. 6.3.1 Origin of the floral nectary.
6.3.2 Conversion of chloroplasts into chromoplasts. 6.3.3 Filling of the nectary. 6.4 Protection of the gynoecium.
6.5 Gene expression. 6.5.1 Macroarray analysis indentifies defence genes.
188.8.131.52 Role of hydrogen peroxide in plant stress and defence. 184.108.40.206 Role of ascorbate in plant stress and
defence. 6.5.2 EST analysis. 6.5.3 Nectary-specific gene expression. 6.6 Nectary molecular biology in other species.
6.6.1 Other nectary-expressed genes. 6.6.2 Metabolism and nectar secretion. 6.6.3 Hormones and nectar production.
6.6.4 CO2 and nectar.
7. Nectar Consumers; S.W. Nicolson. 7.1 Introduction. 7.2 Not all floral nectar drinkers are pollinators.
7.2.1 Generalisation and specialization in pollination systems. 7.2.2 Nectar robbing and nectar theft.
7.3 Insect nectar consumers. 7.3.1 Coleoptera. 7.3.2 Diptera. 7.3.3 Lepidoptera. 7.3.4 Hymenoptera.
220.127.116.11 Wasps. 18.104.22.168 Bees. 22.214.171.124 Ants. 7.4 Vertebrate nectar consumers. 7.4.1 Lizards.
7.4.2 Birds. 7.4.3 Bats. 7.4.4 Other mammals. 7.5 What happens to nectar during pollinator shifts?
7.6 Conclusion. 8. Ecological and Evolutionary Aspects of Floral Nectars in Mediterranean Habitats; T. Petanidou.
8.1 Nectar secretion in Mediterranean habitats. 8.2 Characteristics of Mediterranean nectars.
8.2.1 Nectar constituents of Mediterranean nectars. 126.96.36.199 Sugars. 188.8.131.52 Amino acids.
184.108.40.206 Minerals in floral nectars. 220.127.116.11 Secondary compounds. 18.104.22.168 Nectar viscosity.
8.2.2 Issues of nectar quantity and quality. 8.2.3 Plant Species with no nectar.
8.3 Factors shaping nectar secretion and other characteristics.
8.3.1 Temperature. 8.3.2 Humidity. 8.3.3 Light intensity. 8.3.4 Water stress. 8.3.5 Nutrient stress.
8.3.6 Ecological succession. 8.4 Matching nectars and flower types. 8.5 Nectar and the pollinator interface.
8.5.1 Relating consumers to deep-flower nectars. 8.5.2 Nectar sugars and pollinators.
8.5.3 Nectar amino acids and pollinators. 8.5.4 Nectar minerals and pollinators.
8.5.5 Nectar secondary compounds and pollinators. 8.5.6 Floral nectar, floral diversity, and bee diversity.
8.5.7 What types of nectars do pollinators prefer? 8.6 Nectar management of Mediterranean habitats.
8.6.1 Introduced and invasive plants: effects on wild flowers and bees. 8.6.2 Invasive bees: beekeeping,
bumblebee management, and wild bee conservation.
Index to Scientific Names.
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