Gain of function of stomatal movements in rooting Vitis vinifera L. plants: regulation by H2O2 is independent of ABA before the protruding of roots

Vilela, Belmiro; Carvalho, Luísa C.; Ferreira, J. G.; Amâncio, Sara

doi:10.1007/s00299-007-0427-3

Cited by 25 publications

(21 citation statements)

References 32 publications

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“…This coincides with the protrusion of new roots and the expansion of the first ex vitro leaf and culminates with a peak of ABA and H 2 O 2 concentration on the seventh day after transfer, both produced in the newly-expanded and functional roots (Figure 3; Neves et al, 1998;Vilela et al, 2007). At this point, acclimatization to ex vitro is not yet complete but photooxidative stress is no longer a problem for the growing grapevine plants.…”

Section: Oxidative Stress In In Vitro Systemsmentioning

confidence: 99%

“…The heat map represents the differences between the values measured at the moment of transfer to ex vitro (control) and those monitored for 7 days of ex vitro growth: dark green, very significant increase from the control; light green, significant increase from the control; gray, no significant differences to the control; orange, significant decrease from the control; red, very significant decrease from the control. Values were retrieved from Carvalho et al (2006) and Vilela et al (2007).…”

Section: Oxidative Stress In In Vitro Systemsmentioning

confidence: 99%

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Oxidative stress homeostasis in grapevine (Vitis vinifera L.)

Carvalho

Vidigal

Amâncio

2015

Front. Environ. Sci.

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Plants can maintain growth and reproductive success by sensing changes in the environment and reacting through mechanisms at molecular, cellular, physiological, and developmental levels. Each stress condition prompts a unique response although some overlap between the reactions to abiotic stress (drought, heat, cold, salt or high light) and to biotic stress (pathogens) does occur. A common feature in the response to all stresses is the onset of oxidative stress, through the production of reactive oxygen species (ROS). As hydrogen peroxide and superoxide are involved in stress signaling, a tight control in ROS homeostasis requires a delicate balance of systems involved in their generation and degradation. If the plant lacks the capacity to generate scavenging potential, this can ultimately lead to death. In grapevine, antioxidant homeostasis can be considered at whole plant levels and during the development cycle. The most striking example lies in berries and their derivatives, such as wine, with nutraceutical properties associated with their antioxidant capacity. Antioxidant homeostasis is tightly regulated in leaves, assuring a positive balance between photosynthesis and respiration, explaining the tolerance of many grapevine varieties to extreme environments. In this review we will focus on antioxidant metabolites, antioxidant enzymes, transcriptional regulation and cross-talk with hormones prompted by abiotic stress conditions. We will also discuss three situations that require specific homeostasis balance: biotic stress, the oxidative burst in berries at veraison and in vitro systems. The genetic plasticity of the antioxidant homeostasis response put in evidence by the different levels of tolerance to stress presented by grapevine varieties will be addressed. The gathered information is relevant to foster varietal adaptation to impending climate changes, to assist breeders in choosing the more adapted varieties and suitable viticulture practices.

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Section: Oxidative Stress In In Vitro Systemsmentioning

confidence: 99%

Section: Oxidative Stress In In Vitro Systemsmentioning

confidence: 99%

Oxidative stress homeostasis in grapevine (Vitis vinifera L.)

Carvalho

Vidigal

Amâncio

2015

Front. Environ. Sci.

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“…Assim, quando a energia de excitação luminosa é superior à energia usada no processo fotossintético e/ou em condições de temperaturas supra ótimas a acumulação de espécies reativas de oxigênio (EROs), tais como o peróxido de hidrogênio ocorre. As EROs podem não só modificar o metabolismo fotossintético e danificar o aparelho fotossintético devido ao estresse oxidativo (Munné-Bosch et al, 2002;Lawlor & Cornic, 2002;Chaves et al, 2011;Dias et al, 2014), mas também afetar o comportamento estomático (Vilela et al, 2007).…”

Section: Introductionunclassified

Fisiologia e metabolismo foliar em duas variedades de videira sujeitas a um ciclo de défice hídrico e reidratação

Cerqueira

Costa

Chaves

et al. 2015

Agraria

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RESUMOEste trabalho teve como objetivo comparar duas variedades de videira cultivadas em Portugal, Syrah e Touriga Nacional, em termos de suas respostas fisiológicas e bioquímicas a um ciclo de estresse hídrico severo seguido de reidratação. Os tratamentos consistiram em videiras continuamente regadas (FI) e videiras não regadas durante 21 dias e reidratadas após o potencial hídrico foliar de base (Ψ pd ) atingir cerca de -1,1MPa (NI). As observações ocorreram em quatro momentos: i) imediatamente antes de suprimir a rega (dia 0), ii) no momento de máximo de estresse (dia 21), iii) dois dias após reidratação (dia 23) e iv) seis dias após reidratação (dia 27). Mediu-se o potencial hídrico foliar de base (Ψ pd ) e do meio dia (Ψ md ), a condutância estomática ao vapor de água (gs), a fotossíntese líquida (An), a transpiração (E), a concentração sub-estomática de CO 2 (Ci) e a fluorescência da clorofila a. O teor de clorofila total e teor de peróxido de hidrogênio (H 2 O 2 ) foram também determinados nas folhas. Todos os parâmetros avaliados foram negativamente afetados pelo estresse hídrico, exceto a fluorescência basal (Fo). A capacidade de recuperação foi similar nas duas variedades, apresentando, inclusive, limitação na taxa da fotossíntese líquida após seis dias a reidratação. A variedade Touriga Nacional apresentou maior degradação de clorofila e maiores teores de H 2 O 2 nas folhas, comparada à variedade Syrah.Palavras-chave: Espécies reativas de oxigênio, fluorescência da clorofila a, potencial hídrico, trocas gasosas, Vitis vinifera Leaf physiology and metabolism in two grapevine varieties subjected to a drying and wetting cycle ABSTRACTThis work aimed to compare two grapevine varieties grown in Portugal, Syrah and Touriga Nacional, in terms of their physiological and biochemical behavior in response to a cycle of severe water stress followed by rehydration. Vines were subjected to either continuous watering (FI) or not watered for 21 days and rehydrated after leaf water potential at predawn reach -1.1 MPa (NI).Observations took place at four stages: i) immediately before water withdrawal (day 0), ii) Maximum stress (day 21), iii) two days after rehydration (day 23) and iv) six days after rehydration (day 27). We measured leaf water potential at pre-dawn (Ψ pd ) and at midday (Ψ md ), stomatal conductance to water vapor (gs), net photosynthesis (An), transpiration (E), the sub-stomatal CO 2 concentration (ci) and chlorophyll a fluorescence. The contents of total chlorophyll content and hydrogen peroxide (H 2 O 2 ) in leaves were determined as well. All parameters were negatively affected by water stress, except basal fluorescence (Fo). The recovery capacity in terms of water potential and leaf gas exchange was similar in both varieties but it proved incomplete, in particular for net photosynthesis. The variety 'Touriga Nacional' showed higher degradation of chlorophyll and higher levels of H 2 O 2 in leaves than the 'Syrah' variety, which may explain the high susceptibility of Touriga to leaf senescence and...

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“…The initial responses to ABA in stomatal closure in-clude increases in ROS (Vilela et al 2007), which are important signalling molecules in defense. This is in accordance with osmotic stress-induced strong inhibition of photosynthetic efficiency in grapevine leaf discs.…”

Section: Aba and Defense Responsesmentioning

confidence: 99%