Antagonistic Changes between Abscisic Acid and Gibberellins in Citrus Fruits Subjected to a Series of Different Water Conditions

Mahouachi, Jalel; Gómez-Cádenas, Aurelio; Primo‐Millo, Eduardo; Talón, Manuel

doi:10.1007/s00344-004-0001-y

Cited by 41 publications

(18 citation statements)

References 25 publications

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“…Hence, the data demonstrated that ABA accumulates progressively in leaf and root tissues in a parallel manner to the increase of drought intensity, showing a maximum accumulation at the end of stress period. Nevertheless, rehydration reverted ABA concentration to control levels in both leaf and root tissue as fast as in 24 h. A similar behaviour was reported in citrus plants, showing a keyrole for ABA in controlling adaptive responses to severe drought such as leaf and fruitlet abscission (Gómez-Cadenas et al 1996;Mahouachi et al 2005). The data presented here are compatible with previous works suggesting a central role for JA as a stress-sensing signal.…”

Section: Discussionsupporting

confidence: 93%

“…In citrus, for example, drought increased ABA levels in fruitlets of Clementine and Okitsu cultivars (Mahouachi et al 2005) and in leaves and roots of mandarin seedlings (Gómez-Cadenas et al 1996) whereas rehydration reverted this effect. In addition, it has been proposed that, under water stress conditions, ABA promotes the closure of stomata to minimize water loss through transpiration and mitigates stress damage through the induction of many stress-responsive genes encoding for LEA-like proteins and enzymes involved in the biosynthetic pathways of compatible osmolytes.…”

mentioning

confidence: 96%

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Hormonal changes in papaya seedlings subjected to progressive water stress and re-watering

Mahouachi

Arbona

2007

Plant Growth Regul

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Changes on abscisic acid (ABA), jasmonic acid (JA) and indole-3-acetic acid (IAA) levels were investigated in papaya seedlings (Carica papaya L.) cv. ''Baixinho de Santa Amalia'' under progressive water stress and subsequent rehydration. Also, the behaviour of leaf gas exchange and leaf growth was determined under stress condition. The results indicated that ABA and JA differ in their pattern of change under water stress. ABA continuously increased in leaves and roots during the whole period of stress whereas JA showed a sharp increase and a later decrease in both organs. Re-watering reduced rapidly (24 h) leaf and root ABA to control levels whereas the influence on JA levels could not be assessed. Drought and recovery did not alter IAA levels in leaf and root tissues of papaya seedlings. In addition, water stress reduced stomatal conductance, photosynthetic rate, transpiration rate, the percentage of attached leaves and leaf growth. Rehydration reverted in few days the effects of stress on leaf growth and gas exchange parameters. Overall, the data suggest that ABA could be involved in the induction of several progressive responses such as the induction of stomatal closure and leaf abscission to reduce papaya water loss. In addition, the pattern of accumulation of JA is compatible with a triggering signal upstream ABA. The unaltered levels of IAA could suggest a certain adaptive ability of papaya to maintain active physiological processes under progressive drought stress.

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Section: Discussionsupporting

confidence: 93%

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confidence: 96%

Hormonal changes in papaya seedlings subjected to progressive water stress and re-watering

Mahouachi

Arbona

2007

Plant Growth Regul

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“…Este proceso afecta el complejo de membranas de la célula, por lo que puede incidir de manera negativa en procesos celulares tales como la respiración (cuando afecta las membranas mitocondriales) y la fotosíntesis (cuando afecta las membranas de los tilacoides en los cloroplastos) (Mahouachi et al, 2005). Por tanto, aquellas plantas sometidas a estrés en las que no se observa un incremento en los niveles de MDA, presentan una mayor capacidad para tolerar tal condición.…”

Section: Bioquímicos Contenido De Malondialdehido (Mda)unclassified

Respuesta de cultivares de Musa spp. al estrés hídrico in vitro inducido con polietilenglicol 6000

Moreno-Bermúdez¹,

Reyes²,

Rodríguez³

et al. 2017

Rev. colomb. biotecnol.

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Respuesta de cultivares de Musa spp. al estrés hídrico in vitro 75Respuesta de cultivares de Musa spp. al estrés hídrico in vitro inducido con polietilenglicol 6000Responses of Musa spp. cultivars to in vitro water stress induced with polyethylene glycol 6000 RESUMEN Los plátanos y bananos son cultivos sensibles al déficit hídrico. Las sequías cada vez más prolongadas sugieren la necesidad de obtener plantas tolerantes a este factor; la selección temprana de estas plantas, comparada con la selección en campo, permite ahorrar tiempo y trabajar con mayores volúmenes de individuos. Para ello es conveniente contar con cultivares patrones cuya respuesta al déficit hídrico in vitro sea favorable. El objetivo del presente trabajo fue determinar la respuesta de cultivares de Musa spp. con diferente composición genómica al estrés hídrico inducido in vitro con polietilenglicol 6000 (PEG-6000). Se estudiaron los cultivares 'Pelipita' (ABB), 'Manzano' (AAB) y 'Grande naine' (AAA). El estrés se indujo con 30 g/L de PEG-6000 en medio de cultivo semisólido de multiplicación. A los 30 días se evaluaron variables indicadoras de estrés morfológicas (altura y número de brotes por explante), fisiológicas (masa fresca y masa seca) y bioquímicas (contenido prolina, peróxido de hidrógeno y malondialdehido). En el cultivar 'Pelipita' se afectó solamente la altura de las plantas, mientras que en los demás se afectaron todas las variables excepto la masa seca en el 'Manzano'. En este último y en el 'Grande naine' se incrementó la prolina, el peróxido de hidróge-no y el malondialdehido, lo que evidenció un mayor estrés oxidativo y daño en las membranas celulares. Los cultivares estudiados, pudieran emplearse como controles de tolerancia ('Pelipita') y sensibilidad ('Grande naine' y 'Manzano') en la selección in vitro de plantas tolerantes a la sequía, en futuros programas de mejoramiento genético. ABSTRACTBananas and plantains are crops very sensitive to water deficit. Increasingly prolonged drought condition suggests the need for tolerant plants to this factor. The early selection of these plants in in vitro conditions save time and allow working with large volumes of individuals. This requires having genotypes with favorable response to in vitro water deficit. The aim of this work was to determine the response of Musa spp. cultivars, with different genotype contribution, to in vitro water stress induced by polyethylene glycol 6000 (PEG-6000). Cultivars 'Pelipita' (ABB), 'Manzano' (AAB) and 'Grande naine' (AAA) were cultured in semisolid multiplication medium supplemented with PEG-6000 30 g/L. Different stress indicator traits were evaluated after 30 days (morphological: height and number of shoots per explant; physiological: fresh and dry weight; and biochemical: proline, hydrogen peroxide and malondialdehyde content). As results, osmotic stress affected only plant height in 'Pelipita' cultivar. However, in the other cultivars all variables were affected, except dry weight in 'Manzano'. Moreover cv. 'Grande naine' and 'Manzano' increas...

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“…Interestingly, these two ABA increases coincide with the abscission waves occurring at the onset of phases I and II. This hormone is also high over periods of lower humidity, dehydration and salt or drought conditions (Gomez-Cadenas et al, 2003a;Mehouachi et al, 2005;Agustí et al, 2007).…”

Section: Abscisic Acidmentioning

confidence: 99%

Physiology of citrus fruiting

Iglesias

Cercós

Colmenero‐Flores

et al. 2007

Braz. J. Plant Physiol.

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310

232

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Citrus is the main fruit tree crop in the world and therefore has a tremendous economical, social and cultural impact in our society. In recent years, our knowledge on plant reproductive biology has increased considerably mostly because of the work developed in model plants. However, the information generated in these species cannot always be applied to citrus, predominantly because citrus is a perennial tree crop that exhibits a very peculiar and unusual reproductive biology. Regulation of fruit growth and development in citrus is an intricate phenomenon depending upon many internal and external factors that may operate both sequentially and simultaneously. The elements and mechanisms whereby endogenous and environmental stimuli affect fruit growth are being interpreted and this knowledge may help to provide tools that allow optimizing production and fruit with enhanced nutritional value, the ultimate goal of the Citrus Industry. This article will review the progress that has taken place in the physiology of citrus fruiting during recent years and present the current status of major research topics in this area. Key words: abiotic stresses, abscission, color break, flowering, fruit set, ripening Fisiologia da frutificação em citrus. Citrus é a principal fruteira no mundo, tendo, portanto, profundos impactos econômicos, sociais e culturais em nossa sociedade. Nos últimos anos, o conhecimento sobre a biologia reprodutiva de plantas tem aumentado consideravelmente, principalmente em função de trabalhos desenvolvidos com plantas-modelo. Todavia, a informação produzida nessas espécies nem sempre pode ser aplicada a citrus, fundamentalmente porque citrus é uma cultura arbórea perene com uma biologia reprodutiva muito peculiar e incomum. A regulação do crescimento e desenvolvimento do fruto em citrus é um fenômeno complexo e dependente de muitos fatores externos e internos que podem operar tanto seqüencialmente como simultaneamente. Os elementos e mecanismos pelos quais estímulos ambientes e endógenos afetam o crescimento do fruto vêm sendo interpretados, e esse conhecimento pode auxiliar a prover ferramentas que permitiriam otimizar a produção per se, além da obtenção de frutos com maior valor nutricional, o objetivo precípuo da Industria de Citrus. Neste artigo, revisam-se os avanços que vêm ocorrendo na fisiologia da frutificação de citrus durante os últimos anos; apresenta-se, também, o status atual de pesquisas mais relevantes nessa área. Palavras-chave: estresses abióticos, floração, maturação, vingamento de frutos

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Antagonistic Changes between Abscisic Acid and Gibberellins in Citrus Fruits Subjected to a Series of Different Water Conditions

Cited by 41 publications

References 25 publications

Hormonal changes in papaya seedlings subjected to progressive water stress and re-watering

Hormonal changes in papaya seedlings subjected to progressive water stress and re-watering

Respuesta de cultivares de Musa spp. al estrés hídrico in vitro inducido con polietilenglicol 6000

Physiology of citrus fruiting

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