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Nectar secretion in excised flowers. III. The dual effect of indolyl-3-acetic acid National Institute of Agronomic Research
Shuel, R. W..
The quantity of nectar sugar secreted by excised Antirrhinum flowers was reduced when indolyl-3-acetic acid (IAA) was added to the culture solution at 5 X 104M concentration. The volume of fluid was reduced by IAA in culture solutions containing 5-20% sucrose, but increased by IAA in pure water or dilute sucrose solutions. Pre-treatment with IAA produced the same effects as constant exposure. Calcium and potassium ions modified the action of IAA on water excretion. Nectaries of IAA-treated flowers differed in microscopic appearance from those of controls, and resembled the nectaries of flowers cultured in pure water. A dual effect of IAA on sugar and water excretion is inferred and, as a corollary, a partial independence of movement of the solid and liquid...
Tipo: Journal Article-postprint Palavras-chave: NECTAR; SECRETION; EXCISED FLOWER; ANTIRRHINUM; INDOLYL-3-ACETIC ACID; NECTARY; SUGAR; WATER; NECTAR; SECRETION; FLEUR EXCISEE; ANTIRRHINUM; INDOLYL-3-ACETIC ACID; NECTAIRE; SUCRE; EAU.
Ano: 1964 URL: http://hdl.handle.net/2174/374
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The impact of support for imports on food security in Indonesia AgEcon
Rusastra, I Wayan; Napitupulu, Togar Alam; Bourgeois, Robin.
This study on the impact of import support on food security was conducted in eight developing countries -including Indonesia- that were facing food insecurity and were recipients of subsidized exports and food aid. In Indonesia, the analysis of import flows in comparison with overall production and consumption data led to the selection of the three import substitute commodities, soybean, sugar and milk, that were the focus of this study. The objective of the study was to provide an analysis of the national impact of export support measures on food security, by taking into account their impact on the producers and consumers of the three commodities.
Tipo: Book Palavras-chave: IMPORTS; EXPORTS; FOOD; ECURITY; SOYBEANS; SUGAR; MILK; FOOD AID; Agricultural and Food Policy; Crop Production/Industries; Food Security and Poverty; International Relations/Trade; Production Economics.
Ano: 2008 URL: http://purl.umn.edu/96656
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Water deficits uncouple growth from photosynthesis, increase C content, and modify the relationships between C and growth in sink organs Inra
Muller, B.; Pantin, F.; Génard, M.; Turc, O.; Freixes, S.; Piques, M.; Gibon, Y..
In plants, carbon (C) molecules provide building blocks for biomass production, fuel for energy, and exert signalling roles to shape development and metabolism. Accordingly, plant growth is well correlated with light interception and energy conversion through photosynthesis. Because water deficits close stomata and thus reduce C entry, it has been hypothesised that droughted plants are under C starvation and their growth under C limitation. In this review, these points are questioned by combining literature review with experimental and modelling illustrations in various plant organs and species. First, converging evidence is gathered from the literature that water deficit generally increases C concentration in plant organs. The hypothesis is raised that...
Tipo: Journal Article Palavras-chave: C METABOLISM; C SIGNALLING; GROWTH; MODEL; SINK LIMITATION; SOURCE LIMITATION; STARCH; SUGAR; WATER DEFICIT.
Ano: 2011 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD201178b31f14&uri=/notices/prodinra1/2011/06/
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