C/N and PS/N ratios during growth and senescence of Phaseolus vulgaris L. leaves.
The macromolecules content (protein, nucleic acid, and carbohydrates) changes during leaf growth and senescence. However, no data are presently available concerning the changes of fundamental elements like Nitrogen and Carbon, and their relations. A hypothesis that variation in C/N and WR/N ratios m...
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| Format: | Online |
| Language: | spa |
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Facultad de Ciencias Agropecuarias
1991
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| Subjects: | |
| Online Access: | https://revistas.unc.edu.ar/index.php/agris/article/view/2241 |
| _version_ | 1838139005299851264 |
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| author | Pereyra de Altamira, S. M. Trippi, V. S. |
| author_facet | Pereyra de Altamira, S. M. Trippi, V. S. |
| author_sort | Pereyra de Altamira, S. M. |
| collection | Portal de Revistas |
| description | The macromolecules content (protein, nucleic acid, and carbohydrates) changes during leaf growth and senescence. However, no data are presently available concerning the changes of fundamental elements like Nitrogen and Carbon, and their relations. A hypothesis that variation in C/N and WR/N ratios may be used as an ontogenic index of leaf physiology stage is proposed. The first pair of leaves of Phaseolus vulgaris L. var Balln de Albenga was used, and two experiments were carried out: 1) Leaf growth and senescence. 2) Correlation suppression (apex excision and defoliation). The results indicated that C/N and WR/N ratios are a possible index of leaf physiological stage during growth and senescence. These findings are supported by: i) Both relations (C/N and WR/N) show a steady increase during leaf ontogeny. ii) Senescence-delaying treatments promote a decline (apex excision) or stabilization (defoliation) of C/N and WR/N ratios. |
| format | Online |
| id | oai:ojs.revistas.unc.edu.ar:article-2241 |
| institution | Universidad Nacional de Cordoba |
| language | spa |
| publishDate | 1991 |
| publisher | Facultad de Ciencias Agropecuarias |
| record_format | ojs |
| spelling | oai:ojs.revistas.unc.edu.ar:article-22412025-06-10T15:31:51Z C/N and PS/N ratios during growth and senescence of Phaseolus vulgaris L. leaves. Las relaciones C/N y PS/N durante el crecimiento y la senescencia de hojas de Phaseolus vulgaris L. Pereyra de Altamira, S. M. Trippi, V. S. Phaseolus sp. senescence carbon/nitrogen ratio Phaseolus sp. senescencia relación carbono/nitrógeno The macromolecules content (protein, nucleic acid, and carbohydrates) changes during leaf growth and senescence. However, no data are presently available concerning the changes of fundamental elements like Nitrogen and Carbon, and their relations. A hypothesis that variation in C/N and WR/N ratios may be used as an ontogenic index of leaf physiology stage is proposed. The first pair of leaves of Phaseolus vulgaris L. var Balln de Albenga was used, and two experiments were carried out: 1) Leaf growth and senescence. 2) Correlation suppression (apex excision and defoliation). The results indicated that C/N and WR/N ratios are a possible index of leaf physiological stage during growth and senescence. These findings are supported by: i) Both relations (C/N and WR/N) show a steady increase during leaf ontogeny. ii) Senescence-delaying treatments promote a decline (apex excision) or stabilization (defoliation) of C/N and WR/N ratios. El contenido de macromoléculas (proteínas, ácidos nucleicos e hidratos de carbono)cambia durante el crecimiento y senescencia foliar. La alteración de las proporciones de los elementos fundamentales como nitrógeno y carbono , no han recibido mucha atención. Se propone como hipótesis que los cambios de las relaciones carbono/nitrógeno (C/N)y peso seco/nitrógeno ( PS/N) pueden ser un indicador ontogénico del estado fisiológico, del tejido foliar. Se trabajó con hojas primarias de Phaseolus vulgaris L. var Balín de Albenga y se realizaron dos experiencias: 1) Crecimiento y senescencia foliar. 2 ) Supresión de correlaciones(apicectomía y defoliación). El análisis de los resultados permite concluir que las relaciones C/N y PS/N pueden servir como índices del estado fisiológico de las hojas durante el crecimiento y la senescencia . Ello debido a que: i) Ambas relaciones (C/N yPS/N) aumentan constantemente durante la ontogenia de la hoja . ii) Los tratamientos que retardan en diferente magnitud la senescencia foliar, provocan disminuciones (apicectomía)o estabilización (defoliación ) de las relaciones C/N y PS/N. Facultad de Ciencias Agropecuarias 1991-12-01 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://revistas.unc.edu.ar/index.php/agris/article/view/2241 10.31047/1668.298x.v8.n0.2241 AgriScientia; Vol. 8 (1991); 3-7 AgriScientia; Vol. 8 (1991); 3-7 1668-298X 10.31047/1668.298x.v8.n0 spa https://revistas.unc.edu.ar/index.php/agris/article/view/2241/20414 Derechos de autor 1991 S. M. Pereyra de Altamira, V. S. Trippi https://creativecommons.org/licenses/by-sa/4.0 |
| spellingShingle | Phaseolus sp. senescence carbon/nitrogen ratio Phaseolus sp. senescencia relación carbono/nitrógeno Pereyra de Altamira, S. M. Trippi, V. S. C/N and PS/N ratios during growth and senescence of Phaseolus vulgaris L. leaves. |
| title | C/N and PS/N ratios during growth and senescence of Phaseolus vulgaris L. leaves. |
| title_alt | Las relaciones C/N y PS/N durante el crecimiento y la senescencia de hojas de Phaseolus vulgaris L. |
| title_full | C/N and PS/N ratios during growth and senescence of Phaseolus vulgaris L. leaves. |
| title_fullStr | C/N and PS/N ratios during growth and senescence of Phaseolus vulgaris L. leaves. |
| title_full_unstemmed | C/N and PS/N ratios during growth and senescence of Phaseolus vulgaris L. leaves. |
| title_short | C/N and PS/N ratios during growth and senescence of Phaseolus vulgaris L. leaves. |
| title_sort | c n and ps n ratios during growth and senescence of phaseolus vulgaris l leaves |
| topic | Phaseolus sp. senescence carbon/nitrogen ratio Phaseolus sp. senescencia relación carbono/nitrógeno |
| topic_facet | Phaseolus sp. senescence carbon/nitrogen ratio Phaseolus sp. senescencia relación carbono/nitrógeno |
| url | https://revistas.unc.edu.ar/index.php/agris/article/view/2241 |
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