The effect of humic acids on root growth and endogenous levels of auxin and inhibitory-like substances

The present paper reports on the effect of complete humic acid extract and medium molecular mass fraction thereof on the growth of sunflower root sections and on the endogenous level of plant growth regulators. Humic acids in nutrient solution, as opposed to humic acids or nutrient solution alone, c...

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Autores principales: Casenave De Sanfilippo, E., Arguello, J. A., Correa, N. S., Orioli, G. A.
Formato: Artículo revista
Lenguaje:Inglés
Publicado: Facultad de Ciencias Agropecuarias 1990
Materias:
humic acids
root growth
plant growth regulators
ácidos húmico
crecimiento radical
reguladores de crecimiento vegetal
Acceso en línea:https://revistas.unc.edu.ar/index.php/agris/article/view/936
Aporte de:
AgriScientia de Universidad Nacional de Córdoba
id I10-R352-article-936
record_format ojs
spelling I10-R352-article-9362025-06-03T15:35:28Z The effect of humic acids on root growth and endogenous levels of auxin and inhibitory-like substances Efecto de los ácidos húmicos sobre el crecimiento de las raíces y los niveles endógenos de auxina y sustancias similares a inhibidores Casenave De Sanfilippo, E. Arguello, J. A. Correa, N. S. Orioli, G. A. humic acids root growth plant growth regulators ácidos húmico crecimiento radical reguladores de crecimiento vegetal The present paper reports on the effect of complete humic acid extract and medium molecular mass fraction thereof on the growth of sunflower root sections and on the endogenous level of plant growth regulators. Humic acids in nutrient solution, as opposed to humic acids or nutrient solution alone, caused the growth rate in root sections to diminish. Higher concentrations of humic acids proved to have an even stronger inhibitory effect. Root sections treated with 285 mg/L of medium molecular mass fraction showed improved growth and higher endogenous levels of growth-promoting substances than the control. Concentrations as high as 2000 mg/L of complete humic acid extract caused an increase in the endogenous levels of inhibitors. It is suggested that humic acids affect root growth either by altering the metabolism of endogenous plant regulators or by acting as growth-regulating substances themselves. En el presente trabajo se informa sobre el efecto de un extracto completo de ácidos húmicos y su fracción de medio peso molecular sobre el crecimiento y el nivel endógeno de reguladores del crecimiento en raíces de girasol. Los ácidos húmicos en solución nutritiva disminuyen el crecimiento de secciones radicales, a diferencia de lo observado al utilizar ácidos húmicos o solución nutritiva sola. Cuanto mayor es la concentración, mayor es el efecto inhibidor. Las secciones radicales tratadas con 285 mg/L de la fracción de medio peso molecular mostraron aumento en el crecimiento y en el contenido endógeno de sustancias promotoras del crecimiento. Concentraciones tan altas como 2000 mg/L del extracto completo causaron un aumento en los niveles endógenos de inhibidores. Estos resultados sugieren que los ácidos húmicos afectan el crecimiento radical, ya sea por alterar el metabolismo de los reguladores del crecimiento o por actuar per se como sustancias reguladoras. Facultad de Ciencias Agropecuarias 1990-12-01 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://revistas.unc.edu.ar/index.php/agris/article/view/936 10.31047/1668.298x.v7.n1.936 AgriScientia; Vol. 7 (1990); 9-12 AgriScientia; Vol. 7 (1990); 9-12 1668-298X 10.31047/1668.298x.v7.n1 eng https://revistas.unc.edu.ar/index.php/agris/article/view/936/870 Derechos de autor 1990 E. Casenave De Sanfilippo; J. A. Arguello, N. S. Correa, G. A. Orioli https://creativecommons.org/licenses/by-sa/4.0
institution Universidad Nacional de Córdoba
institution_str I-10
repository_str R-352
container_title_str AgriScientia
language Inglés
format Artículo revista
topic humic acids
root growth
plant growth regulators
ácidos húmico
crecimiento radical
reguladores de crecimiento vegetal
spellingShingle humic acids
root growth
plant growth regulators
ácidos húmico
crecimiento radical
reguladores de crecimiento vegetal
Casenave De Sanfilippo, E.
Arguello, J. A.
Correa, N. S.
Orioli, G. A.
The effect of humic acids on root growth and endogenous levels of auxin and inhibitory-like substances
topic_facet humic acids
root growth
plant growth regulators
ácidos húmico
crecimiento radical
reguladores de crecimiento vegetal
author Casenave De Sanfilippo, E.
Arguello, J. A.
Correa, N. S.
Orioli, G. A.
author_facet Casenave De Sanfilippo, E.
Arguello, J. A.
Correa, N. S.
Orioli, G. A.
author_sort Casenave De Sanfilippo, E.
title The effect of humic acids on root growth and endogenous levels of auxin and inhibitory-like substances
title_short The effect of humic acids on root growth and endogenous levels of auxin and inhibitory-like substances
title_full The effect of humic acids on root growth and endogenous levels of auxin and inhibitory-like substances
title_fullStr The effect of humic acids on root growth and endogenous levels of auxin and inhibitory-like substances
title_full_unstemmed The effect of humic acids on root growth and endogenous levels of auxin and inhibitory-like substances
title_sort effect of humic acids on root growth and endogenous levels of auxin and inhibitory-like substances
description The present paper reports on the effect of complete humic acid extract and medium molecular mass fraction thereof on the growth of sunflower root sections and on the endogenous level of plant growth regulators. Humic acids in nutrient solution, as opposed to humic acids or nutrient solution alone, caused the growth rate in root sections to diminish. Higher concentrations of humic acids proved to have an even stronger inhibitory effect. Root sections treated with 285 mg/L of medium molecular mass fraction showed improved growth and higher endogenous levels of growth-promoting substances than the control. Concentrations as high as 2000 mg/L of complete humic acid extract caused an increase in the endogenous levels of inhibitors. It is suggested that humic acids affect root growth either by altering the metabolism of endogenous plant regulators or by acting as growth-regulating substances themselves.
publisher Facultad de Ciencias Agropecuarias
publishDate 1990
url https://revistas.unc.edu.ar/index.php/agris/article/view/936
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first_indexed 2024-09-03T22:16:14Z
last_indexed 2025-06-10T05:11:10Z
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