Photochemical responses and oxidative stress in two clones of Coffea canephora under water deficit conditions

Lima, Ana Lúcia S; DaMatta, Fábio M.; Pinheiro, Hugo Alves; Tótola, Marcos Rogério; Loureiro, Marcelo Ehlers

doi:10.1016/s0098-8472(01)00130-7

Cited by 278 publications

(200 citation statements)

References 29 publications

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“…Drought stressed dwarf mutant lines of bermudagrass, which maintained higher levels of antioxidant enzymes, were characterized by lower malondialdehyde content, and improved stress resistance than the wild type (Lu et al 2008). However, in a drought-tolerant Coffea canephora clone the level of lipid peroxidation increased under drought conditions, but the increase was lower in a drought-sensitive one, due to the greater activation of the antioxidant system (Lima et al 2002). The lower MDA increase in drought-tolerant Phaseolus acutifolius was related to higher activity of APX and other peroxidases, while a significant MDA increase in drought-sensitive Phaseolus vulgaris was derived from the decreased activities of these enzymes (Türkan et al 2005).…”

Section: Discussionmentioning

confidence: 94%

A comparison of the effects of drought on proline accumulation and peroxidases activity in leaves of Festuca rubra L. and Lolium perenne L.

Bandurska

Jóźwiak

2011

Acta Soc Bot Pol

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The effect of soil drought on leaf water content, proline content, and the activity of guaiacol (GuPX) and ascorbate (APX) peroxidases as well as the level of lipid peroxidation were investigated in leaves of drought resistant red fescue (Festuca rubra) and drought sensitive perennial ryegrass (Lolium perenne). Plants were grown under glasshouse conditions in soil pot culture. 26 day-old grasses were exposed to drought by withholding irrigation for 18 days. Water content in leaves of perennial ryegrass decreased more than in red fescue throughout the experimental period. On the other hand, proline content (PC) was higher in red fescue. The activity of APX and GuPX increased in leaves of red fescue, while it did not change in perennial ryegrass. Our data demonstrate that both red fescue and perennial ryegrass were able to survive applied drought, as shown by a lack of stress-induced lipid peroxidation and hence no evidence of oxidative damage. We speculate, that the observed drought stress tolerance at cellular level was associated with the ability to accumulate proline, and to maintain high activity of APX and GuPX, resulting in protection against oxidative damage and lipid peroxidation. It seems that this mechanism works better in red fescue.

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Section: Discussionmentioning

confidence: 94%

A comparison of the effects of drought on proline accumulation and peroxidases activity in leaves of Festuca rubra L. and Lolium perenne L.

Bandurska

Jóźwiak

2011

Acta Soc Bot Pol

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“…The estimate of the amount of TBA-MDA complex was obtained using the absorption coefficient of 155 mM -1 cm -1 and expressed as nmol g -1 fresh weight (Heath & Packer, 1968). The electrolyte leakage was measured according to the method described by Lima et al (2002). The initial electrical conductivity (L1) of the suspension liquid was read in a conductivity meter (Digimed, model MD-31) and expressed as a percentage of the total conductivity (L2).…”

Section: Methodsmentioning

confidence: 99%

Action of ethylene on postharvest of summer squash ‘Menina Brasileira’

et al. 2017

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RESUMOThe purpose of this study was to evaluate the sensitivity and the physiological responses of summer squash 'Menina Brasileira' to ethylene. Immature fruits were harvested and placed in 20 L sealed buckets, in which ethylene was applied at concentrations of 0.1, 1.0, 10, 100, and 1000 µL L -1 for 24 h. Fruits were placed in buckets with no ethylene as a control treatment. Thereafter, the fruits were taken out of the buckets and maintained on bench, wherein on days 0, 2, 4, 6, and 8, they were evaluated regarding the accumulated fresh weight loss, soluble sugars, reducing and non-reducing sugars, starch, total chlorophyll, content of malondialdehyde, and electrolyte leakage. Fruits of summer squash 'Menina Brasileira' showed sensitivity to exogenous ethylene with no weight loss stimulation. Additionally, the fruits exhibited small changes in nutritional quality attributes and changes in the external fruit appearance, including decreased chlorophyll content as well as damage to cell membrane characterized by increase in malondialdehyde content and electrolyte leakage. These changes were stimulated by increasing exogenous ethylene concentration. Key words: Ação do etileno na pós-colheita de abobrinha 'Menina Brasileira'O objetivo do trabalho foi avaliar a sensibilidade e as respostas fisiológicas da abobrinha 'Menina Brasileira' a diferentes doses de etileno. Os frutos foram colhidos, homogeneizados e colocados em baldes de 20 litros hermeticamente fechados, nos quais foram aplicadas doses de etileno nas concentrações de 0,1; 1,0; 10; 100 e 1000 µL L -1 durante 24 h, além do controle. Posteriormente, os frutos foram retirados dos baldes e mantidos sobre bancada, onde aos dias 0, 2, 4, 6 e 8 foram avaliados quanto à perda de peso fresco e teores de açúcar solúvel total, açúcar redutor e não redutor, amido, clorofila, conteúdo de malonaldeído e extravasamento de eletrólitos. Os frutos da abobrinha 'Menina Brasileira' apresentaram sensibilidade ao etileno exógeno sem estimular a perda de peso fresco. Ademais, os frutos exibiram pequenas alterações nos atributos de qualidade nutricional, além de mudanças no aspecto externo dos frutos, como diminuição do teor de clorofila e injúria por danos à membrana celular, caracterizada pelo aumento do conteúdo de malonaldeído e extravasamento de eletrólitos. Essas alterações foram estimuladas em resposta ao aumento da concentração de etileno.

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“…The ability of coffee to produce satisfactorily in the areas subjected to water deficit has been termed through a suite of morphological and physiological adaptations (leaf area reductions, stomatal closure, osmotic adjustment, etc.) that allow it to survive water stress (DaMatta et al , 2003 but the degree of adaptation to drought may vary considerably ---within species and also within clones , Lima et al 2002. The objective of this study was to investigate possible mechanisms responsible in both mentioned coffee species.…”

Section: Introductionmentioning

confidence: 99%

Responses of two field-grown coffee species to drought and re-hydration

Cai¹,

Chen²,

Guo³

et al. 2005

Photosynt.

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The gas exchange, parameters of chlorophyll fluorescence, contents of pigments, and activities of superoxide dismutase (SOD), ascorbate peroxidase (APX), as well as lipid peroxidation were investigated in two field-grown coffee species, Coffea arabica and C. liberica, exposed to drought and re-hydration. Drought caused a more pronounced inhibition of net photosynthetic rate in C. liberica compared to C. arabica. The de-epoxidation of xanthophyll cycle pigments at midday estimated by leaf reflectance was much higher in C. arabica than in C. liberica, but no significant change was found in response to drought. Under moderate drought, the activities of SOD and APX increased significantly only in C. arabica. The maximum photochemical efficiency of photosystem 2, PS2 (F v /F m ) at predawn did not change and there was no lipid peroxidation during this time. Under severe drought F v /F m decreased and initial fluorescence (F 0 ) increased for both species, and SOD activity increased, APX activity remained relatively high, and malondialdehyde (MDA) accumulated in C. arabica, while APX decreased in C. liberica. The photosynthetic apparatus of C. arabica was completely recovered after 5 d of re-irrigation as indicated by the restoration of F v /F m to the control values. A lack of recovery upon rewatering of C. liberica indicated irreversible damage to PS2. Hence compared to C. liberica, C. arabica possesses a higher desiccation-induced antioxidative protection and higher portion of the total pigment pool used in photoprotection, which might aid alleviating photoinhibitory damage during desiccation and photosynthesis recovery when favourable conditions are restored.

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Photochemical responses and oxidative stress in two clones of Coffea canephora under water deficit conditions

Cited by 278 publications

References 29 publications

A comparison of the effects of drought on proline accumulation and peroxidases activity in leaves of Festuca rubra L. and Lolium perenne L.

A comparison of the effects of drought on proline accumulation and peroxidases activity in leaves of Festuca rubra L. and Lolium perenne L.

Action of ethylene on postharvest of summer squash ‘Menina Brasileira’

Responses of two field-grown coffee species to drought and re-hydration

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