Seed Nitrogen Mobilization in Soybean: Effects of Seed Nitrogen Content and External Nitrogen Fertility
| Autor: | Thomas W. Rufty, Erin Naegle, Thomas E. Carter, Joseph W. Burton, Prachuab Kwanyuen |
|---|---|
| Rok vydání: | 2008 |
| Předmět: |
chemistry.chemical_classification
medicine.diagnostic_test biology Physiology Proteolysis food and beverages chemistry.chemical_element biology.organism_classification Nitrogen Protein catabolism Animal science Agronomy chemistry Seedling medicine Storage protein Sink (computing) Soil fertility Agronomy and Crop Science Plant nutrition |
| Zdroj: | Journal of Plant Nutrition. 31:367-379 |
| ISSN: | 1532-4087 0190-4167 |
| DOI: | 10.1080/01904160801894921 |
| Popis: | Soybean breeding programs have developed genetic lines with relatively low seed protein, which could negatively impact early seedling growth in low fertility conditions commonly encountered in the field. In these experiments, seed protein mobilization and its regulation in situ in soybean lines with different seed protein levels was investigated. The results showed that rates of nitrogen (N) release from cotyledons were much lower with decreasing levels of N in seed. Patterns of proteolysis of the storage proteins glycinin and β -conglycinin and their subunits were not different, but breakdown rates were slower. Seed N release rates increased somewhat when external N was supplied to roots of the developing seedlings, suggesting the involvement of source/sink controls. The effect appeared to be down-stream from proteolysis, as rates of protein breakdown were not altered. The results indicate that low seed protein levels will lead to reduced seedling fitness in low fertility soil conditions unless ... |
| Databáze: | OpenAIRE |
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