Abstract
Soybean plants (Glycine max [L.] Merr var Amsoy 71) were grown in growth chambers with high-phosphorus (high-P) and low-phosphorus (low-P) culture solutions. Low-P treatment reduced shoot growth significantly 7 days after treatment began. Root growth was much less affected by low-P, there being no significant reduction in root growth rate until 17 days had elapsed. The results suggest that low-P treatment decreased soybean growth primarily through an effect on the expansion of the leaf surface which was diminished by 85%, the main effect of low-P being on the rate of expansion of individual leaves. Low-P had a lesser effect on photosynthesis; light saturated photosynthetic rates at ambient and saturating CO2 levels were lowered by 55 and 45%, respectively, after 19 days of low-P treatment. Low-P treatment increased starch concentrations in mature leaves, expanding leaves and fibrous roots; sucrose concentrations, however, were reduced by low-P in leaves and increased in roots. Foliar F-2,6-BP levels were not affected by P treatment in the light but in darkness they increased with high-P and decreased with low-P. The increase in the starch/sucrose ratio in low-P leaves was correlated primarily with changes in the total activities of enzymes of starch and sucrose metabolism.
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Selected References
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- Fader G. M., Koller H. R. Relationships between Respiration Rate and Adenylate and Carbohydrate Pools of the Soybean Fruit. Plant Physiol. 1984 Jul;75(3):694–699. doi: 10.1104/pp.75.3.694. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Fahrendorf T., Holtum J. A., Mukherjee U., Latzko E. Fructose 2,6-bisphosphate, carbohydrate partitioning, and crassulacean Acid metabolism. Plant Physiol. 1987 May;84(1):182–187. doi: 10.1104/pp.84.1.182. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Kerr P. S., Huber S. C., Israel D. W. Effect of N-source on soybean leaf sucrose phosphate synthase, starch formation, and whole plant growth. Plant Physiol. 1984 Jun;75(2):483–488. doi: 10.1104/pp.75.2.483. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Lanzetta P. A., Alvarez L. J., Reinach P. S., Candia O. A. An improved assay for nanomole amounts of inorganic phosphate. Anal Biochem. 1979 Nov 15;100(1):95–97. doi: 10.1016/0003-2697(79)90115-5. [DOI] [PubMed] [Google Scholar]
- Ou-Lee T. M., Setter T. L. Enzyme activities of starch and sucrose pathways and growth of apical and Basal maize kernels. Plant Physiol. 1985 Nov;79(3):848–851. doi: 10.1104/pp.79.3.848. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Radin J. W., Eidenbock M. P. Carbon Accumulation during Photosynthesis in Leaves of Nitrogen- and Phosphorus-Stressed Cotton. Plant Physiol. 1986 Nov;82(3):869–871. doi: 10.1104/pp.82.3.869. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Rufty T. W., Kerr P. S., Huber S. C. Characterization of diurnal changes in activities of enzymes involved in sucrose biosynthesis. Plant Physiol. 1983 Oct;73(2):428–433. doi: 10.1104/pp.73.2.428. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Sicher R. C., Baysdorfer C., Kremer D. F. A comparative analysis of fructose 2,6-bisphosphate levels and photosynthate partitioning in the leaves of some agronomically important crop species. Plant Physiol. 1987 Apr;83(4):768–771. doi: 10.1104/pp.83.4.768. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Steup M., Peavey D. G., Gibbs M. The regulation of starch metabolism by inorganic phosphate. Biochem Biophys Res Commun. 1976 Oct 18;72(4):1554–1561. doi: 10.1016/s0006-291x(76)80191-x. [DOI] [PubMed] [Google Scholar]
- Terry N., Ulrich A. Effects of phosphorus deficiency on the photosynthesis and respiration of leaves of sugar beet. Plant Physiol. 1973 Jan;51(1):43–47. doi: 10.1104/pp.51.1.43. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Treeby M. T., van Steveninck R. F., de Vries H. M. Quantitative Estimates of Phosphorus Concentrations within Lupinus luteus Leaflets by Means of Electron Probe X-ray Microanalysis. Plant Physiol. 1987 Oct;85(2):331–334. doi: 10.1104/pp.85.2.331. [DOI] [PMC free article] [PubMed] [Google Scholar]