The physiology of dormancy in potato tubers and its relations with the hormonal mechanism of tuberization

THE PHYSIOLOGY OF DORMANCY IN POTATO TUBERS AND ITS RELATIONS WITH THE HORMONAL MECHANISM OF TUBERIZATION. Dormancy* is a particular physiological state in which the buds of potato tubers does not germinate owing to internal factors even though they are placed under optimal environmental conditions....

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Autor principal: Tizio, R.
Formato: Artículo revista
Lenguaje:Español
Publicado: Facultad de Ciencias Agropecuarias 1982
Materias:
potato tubers
hormonal mechanism of tuberization
tubérculos de papa
mecanismo hormonal de la tuberización
Acceso en línea:https://revistas.unc.edu.ar/index.php/agris/article/view/905
Aporte de:
AgriScientia de Universidad Nacional de Córdoba
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record_format ojs
institution Universidad Nacional de Córdoba
institution_str I-10
repository_str R-352
container_title_str AgriScientia
language Español
format Artículo revista
topic potato tubers
hormonal mechanism of tuberization
tubérculos de papa
mecanismo hormonal de la tuberización
spellingShingle potato tubers
hormonal mechanism of tuberization
tubérculos de papa
mecanismo hormonal de la tuberización
Tizio, R.
The physiology of dormancy in potato tubers and its relations with the hormonal mechanism of tuberization
topic_facet potato tubers
hormonal mechanism of tuberization
tubérculos de papa
mecanismo hormonal de la tuberización
author Tizio, R.
author_facet Tizio, R.
author_sort Tizio, R.
title The physiology of dormancy in potato tubers and its relations with the hormonal mechanism of tuberization
title_short The physiology of dormancy in potato tubers and its relations with the hormonal mechanism of tuberization
title_full The physiology of dormancy in potato tubers and its relations with the hormonal mechanism of tuberization
title_fullStr The physiology of dormancy in potato tubers and its relations with the hormonal mechanism of tuberization
title_full_unstemmed The physiology of dormancy in potato tubers and its relations with the hormonal mechanism of tuberization
title_sort physiology of dormancy in potato tubers and its relations with the hormonal mechanism of tuberization
description THE PHYSIOLOGY OF DORMANCY IN POTATO TUBERS AND ITS RELATIONS WITH THE HORMONAL MECHANISM OF TUBERIZATION. Dormancy* is a particular physiological state in which the buds of potato tubers does not germinate owing to internal factors even though they are placed under optimal environmental conditions. The length of the dormant period is relatively insensible to environmental factors, but it is correlated with high levels of the β inhibitor-complex and with a very low activity of endogenous gibberellins and cytokinins in the periderm and the buds. On the contrary, the end of this period coincides with a sharp decrease of the inhibitor and with a drastic increase in the levels of those phytohormones. The mechanism through which the inhibitor-complex (whose principal component is abscisic acid (ABA)) controls dormancy is not well established. Recent evidence shows that ABA inhibits DNA and RNA synthesis in the buds of dormant tubers. The inhibitor also interferes the synthesis of α-amylase and other hydrolitic enzymes. It also acts as an uncouplant factor for oxidative phosphorylation. Nevertheless, it has been also put in evidence that none of the inhibitors (β-complex or ABA) stimulate tuberization in sprout sections cultured in vitro. Moreover, under favorable photoperiodic conditions (short-days) or unfavorable ones (long-days or continuous light) for tuberization, the foliage synthesizes similar high levels of the inhibitor-complex which seems to be translocated to the periderm of growing young tubers where it gradually accumulates. When the concentration of the inhibitor rises above a certain level, the tubers are dormant. 
publisher Facultad de Ciencias Agropecuarias
publishDate 1982
url https://revistas.unc.edu.ar/index.php/agris/article/view/905
work_keys_str_mv AT tizior thephysiologyofdormancyinpotatotubersanditsrelationswiththehormonalmechanismoftuberization
AT tizior fisiologiadeladormicionentuberculosdepapaysusrelacionesconelmecanismohormonaldelatuberizacion
AT tizior physiologyofdormancyinpotatotubersanditsrelationswiththehormonalmechanismoftuberization
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spelling I10-R352-article-9052026-05-18T15:53:42Z The physiology of dormancy in potato tubers and its relations with the hormonal mechanism of tuberization Fisiología de la dormición en tubérculos de papa y sus relaciones con el mecanismo hormonal de la tuberización Tizio, R. potato tubers hormonal mechanism of tuberization tubérculos de papa mecanismo hormonal de la tuberización THE PHYSIOLOGY OF DORMANCY IN POTATO TUBERS AND ITS RELATIONS WITH THE HORMONAL MECHANISM OF TUBERIZATION. Dormancy* is a particular physiological state in which the buds of potato tubers does not germinate owing to internal factors even though they are placed under optimal environmental conditions. The length of the dormant period is relatively insensible to environmental factors, but it is correlated with high levels of the β inhibitor-complex and with a very low activity of endogenous gibberellins and cytokinins in the periderm and the buds. On the contrary, the end of this period coincides with a sharp decrease of the inhibitor and with a drastic increase in the levels of those phytohormones. The mechanism through which the inhibitor-complex (whose principal component is abscisic acid (ABA)) controls dormancy is not well established. Recent evidence shows that ABA inhibits DNA and RNA synthesis in the buds of dormant tubers. The inhibitor also interferes the synthesis of α-amylase and other hydrolitic enzymes. It also acts as an uncouplant factor for oxidative phosphorylation. Nevertheless, it has been also put in evidence that none of the inhibitors (β-complex or ABA) stimulate tuberization in sprout sections cultured in vitro. Moreover, under favorable photoperiodic conditions (short-days) or unfavorable ones (long-days or continuous light) for tuberization, the foliage synthesizes similar high levels of the inhibitor-complex which seems to be translocated to the periderm of growing young tubers where it gradually accumulates. When the concentration of the inhibitor rises above a certain level, the tubers are dormant.  FISIOLOGIA DE LA DORMICION DE TUBERCULOS DE PAPA Y SUS RELACIONES CON EL MECANISMO HORMONAL DE LA TUBERIZACION. Dormición* es un particular estado fisiológico por el cual las yemas de tubérculos de papa no brotan debido a factores internos aunque los mismos se coloquen en condiciones óptimas para hacerlo. La longitud del período de dormición es relativamente insensible a factores ambientales, pero se correlaciona con altos niveles del complejo inhibidor β y con una muy baja actividad de giberelinas y citocininas endógenas en la peridermis y yemas de los tubérculos. Por el contrario, la finalización de dicho período coincide con una pronunciada disminución del inhibidor y con un drástico aumento en los niveles de dichas fitohormonas. El mecanismo por el cual el complejo inhibidor (cuyo principal componente es el ácido abscísico (ABA)), no es bien conocido. Evidencia reciente muestra que el ABA inhibe la síntesis de ADN y ARN en las yemas de los tubérculos durmientes. El inhibidor también interfiere la síntesis de α-amilasa y otras enzimas hidrolíticas. También actúa como un factor desacoplante de la fosforilación oxidativa. Además, se ha puesto en evidencia que ninguno de los inhibidores (complejo β o ABA) estimulan tuberización en secciones de brotes cultivadas in vitro. Además, bajo condiciones fotoperiódicas favorables (días cortos) o desfavorables (días largos o luz continua) para tuberización, el follaje sintetiza similares altos niveles del complejo inhibidor, el que parece ser transportado hacia la peridermis de los jóvenes tubérculos en crecimiento donde gradualmente se acumula.  Facultad de Ciencias Agropecuarias 1982-10-01 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://revistas.unc.edu.ar/index.php/agris/article/view/905 10.31047/1668.298x.v3.n1.905 AgriScientia; Vol. 3 (1982); 91-105 AgriScientia; Vol. 3 (1982); 91-105 1668-298X 10.31047/1668.298x.v3.n1 spa https://revistas.unc.edu.ar/index.php/agris/article/view/905/840 Derechos de autor 1982 R. Tizio https://creativecommons.org/licenses/by-sa/4.0

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