Assimilate Partitioning
Mostrando 13-24 de 29 artigos, teses e dissertações.
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13. Maternal, Single-Gene Regulation of Assimilate Partitioning in Pea.
Assimilate partitioning has been identified as a key process in the control of yield. Although the role of reproductive structures in this process has received intensive study, our understanding of the role of the maternal plant is limited. We suggest that the Sn gene of pea (Pisum sativum L.) is a potentially valuable genetic tool for studying maternal regu
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14. Sink limitation induces the expression of multiple soybean vegetative lipoxygenase mRNAs while the endogenous jasmonic acid level remains low.
The response of individual members of the lipoxygenase multigene family in soybeans to sink deprivation was analyzed. RNase protection assays indicated that a novel vegetative lipoxygenase gene, vlxC, and three other vegetative lipoxygenase mRNAs accumulated in mature leaves in response to a variety of sink limitations. These data suggest that several member
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15. Daytime and Nighttime Carbon Balance and Assimilate Export in Soybean Leaves at Different Photon Flux Densities 1
To evaluate daytime and nighttime carbon balance and assimilate export in soybean (Glycine max [L.] Merrill) leaves at different photon flux densities, rates of CO2 exchange, specific leaf weights, and concentrations of sucrose and starch were measured at intervals in leaves of pod-bearing `Amsoy 71' and `Wells II' plants grown in a controlled environment ro
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16. Sucrose is a signal molecule in assimilate partitioning
The proton–sucrose symporter mediates the key transport step in the resource distribution system that allows many plants to function as multicellular organisms. In the results reported here, we identify sucrose as a signaling molecule in a previously undescribed signal-transduction pathway that regulates the symporter. Sucrose symporter activity declined i
The National Academy of Sciences.
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17. Impaired photoassimilate partitioning caused by phloem-specific removal of pyrophosphate can be complemented by a phloem-specific cytosolic yeast-derived invertase in transgenic plants.
Constitutive expression of the Escherichia coli ppa gene encoding inorganic pyrophosphatase resulted in sugar accumulation in source leaves and stunted growth of transgenic tobacco plants. The reason for this phenotype was hypothesized to be reduced sucrose utilization and loading into the phloem. To study the role of PPi in phloem cells, a chimeric gene was
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18. Specific Soybean Lipoxygenases Localize to Discrete Subcellular Compartments and Their mRNAs Are Differentially Regulated by Source-Sink Status1
Members of the lipoxygenase multigene family, found widely in eukaryotes, have been proposed to function in nitrogen partitioning and storage in plants. Lipoxygenase gene responses to source-sink manipulations in mature soybean (Glycine max [L.] Merr.) leaves were examined using gene-specific riboprobes to the five vegetative lipoxygenases (vlxA–vlxE
American Society of Plant Physiologists.
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19. Diurnal Growth of Tall Fescue Leaf Blades 1: II. Dry Matter Partitioning and Carbohydrate Metabolism in the Elongation Zone and Adjacent Expanded Tissue
The spatial distributions of net deposition rates of water soluble carbohydrate-free dry matter (WSC-free DM) and WSC were evaluated within and above the elongation zone of tall fescue (Festuca arundinacea Schreb.) leaf blades during light and darkness. Imported DM used for WSC-free DM synthesis during darkness (67% of the total in experiment I and 59% in ex
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20. Effects of Elevated Sucrose-Phosphate Synthase Activity on Photosynthesis, Assimilate Partitioning, and Growth in Tomato (Lycopersicon esculentum var UC82B).
The expression of a sucrose-phosphate synthase (SPS) gene from maize (Zea mays, a monocotyledon) in tomato (Lycopersicon esculentum, a dicotyledon) resulted in marked increases in extractable SPS activity in the light and the dark. Diurnal modulation of the native tomato SPS activity was found. However, when the maize enzyme was present the tomato leaf cells
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21. Far-Red Light Reflection from Green Leaves and Effects on Phytochrome-Mediated Assimilate Partitioning under Field Conditions
The influence of plant spacing and row orientation on spectral distribution of light received by growing soybean (Gylcine max [L.] Merr.) plants was measured under field conditions. Light absorption, reflection and transmission of individual leaves showed that most of the blue and red was absorbed while most of the far-red was either reflected or transmitted
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22. Purification, cloning, and functional expression of sucrose:fructan 6-fructosyltransferase, a key enzyme of fructan synthesis in barley.
Fructans play an important role in assimilate partitioning and possibly in stress tolerance in many plant families. Sucrose:fructan 6-fructosyltransferase (6-SFT), an enzyme catalyzing the formation and extension of beta-2,6-linked fructans typical of grasses, was purified from barley (Hordeum vulgare L.). It occurred in two closely similar isoforms with ind
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23. Economy of Carbon and Nitrogen in a Nodulated and Nonnodulated (NO3-grown) Legume 1
Partitioning and utilization of assimilated C and N were compared in nonnodulated, NO3-fed and nodulated, N2-fed plants of white lupin (Lupinus albus L.). The NO3 regime used (5 millimolar NO3) promoted closely similar rates of growth and N assimilation as in the symbiotic plants. Over 90% of the N absorbed by the NO3-fed plants was judged to be reduced in r
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24. Evidence for an essential role of the sucrose transporter in phloem loading and assimilate partitioning.
Sucrose is the principal transport form of assimilates in most plants. In many species, translocation of assimilates from the mesophyll into the phloem for long distance transport is assumed to be carrier mediated. A putative sucrose proton cotransporter cDNA has been isolated from potato and shown to be expressed mainly in the phloem of mature exporting lea