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Nutrient Homeostasis, C:N:S Ratios, Protein, and Oil Content in Cuphea Seed
- Abstract::
- Nutrient densities, carbon: nitrogen (C: N), nitrogen: sulphur (N: S), protein, and oil contents and their interrelationships were assessed during a 3-year study in seeds of the indeterminate Cuphea germplasm line PSR23, a potential oilseed crop selected from an inter-specific cross between Cuphea lanceolata and C. viscosissima of the Lythraceae. In order to mitigate the effect of indeterminacy on seed quality traits, the top 25% of biomass was removed at 100 and 200 growing degree days (GDD1 and GDD2, respectively) after flower initiation, as compared to no treatment (GDD0). Biochemical and nutrient densities were impacted by treatments and their interaction with years. Carbon and N allocations responded differently to treatments over years; nevertheless, large variances in C, and N contents and C: N ratio (R2=0.70, 0.73, and 0.82, respectively), but not in N:S ratio (R2=0.21) were explained by seed physical traits, treatments and their interaction with years. The C: N ratio and oil content, but not protein content, can be predicted as functions of nutrient densities in the seed with acceptable, but wide range of reliabilities. Removing the top 25% of biomass 100 GDD after flower initiation consistently resulted in increased oil content and in marked improvements in the reliability of its estimates. Oil and protein contents in Cuphea seed, being positively (r=0.83; p<0.01) and negatively (r=-0.86; p<0.01) correlated with the C: N ratio, respectively, may not be easily and concomitantly improved. N: S ratio, which is negatively correlated with total nutrient density in the seed, if reduced below 12: 1 could lead to larger oil content.
- Author(s):
-
Jaradat, Abdullah A. , Rinke, Jana L.
- Subject(s):
-
Cuphea , oilseed crops , hybrids , carbon , nitrogen content , carbon nitrogen ratio , sulfur , protein content , lipid content , seeds , seed oils , plant nutrition , homeostasis , chemical composition , statistical models , Minnesota
- Description:
- Includes references
- Source:
- Seed science and biotechnology 2010, v. 4, no. 1
- Language:
- English
- Year:
- 2010
- Collection:
-
Journal Articles, USDA Authors, Peer-Reviewed
- File:
-
Download [PDF]
- Rights:
- Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.
