Atividade do sistema antioxidante e desenvolvimento de aerênquima em raízes de milho 'Saracura'

Pereira, Fabricio José; Magalhães, P. C.; Souza, Thiago Corrêa de; Castro, Evaristo Mauro de; Alves, José Donizeti

doi:10.1590/s0100-204x2010000500003

Cited by 17 publications

(11 citation statements)

References 26 publications

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“…Leaf anatomy modifications such as mesophyll and epidermis thickening, increase of stomata density and functionality were demonstrated as potentially related to tolerance to different environmental stresses, such as drought and flooding (Grisi et al, 2008;Souza et al, 2010). Modifications in the vascular system and cortex thickness of roots in plants cultivated under stress can be observed, and can be associated with enzymatic activity variations (Pereira et al, 2008;Souza et al, 2009;Pereira et al, 2010).…”

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Anatomic and physiological modifications in seedlings of Coffea arabica cultivar Siriema under drought conditions

et al. 2014

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Due to the weather changes prognostic for the coming years, the understanding of water deficit and physiological responses of plants to drought becomes an important requirement in order to develop technologies such as mechanisms to assist plants to cope with longer drought periods, which will be essential to maintenance of Brazilian and worldwide production. This study aimed to evaluate ecophysiological and anatomical aspects as well as the nitrate reductase activity in Siriema coffee seedlings subjected to four treatments: Daily irrigated, non-irrigated, re-irrigated 24 hours and re-irrigated 48 hours after different stress periods. Non-irrigation promoted a reduction in leaf water potential being accented from the ninth day of evaluation onwards. Re-irrigation promoted a partial recovery of the plant water potential. Non-irrigated plants showed an increase in stomatal resistance and reduction of transpiration and nitrate reductase activity. In the roots, there was a decrease in nitrate reductase activity under water stress. Leaf anatomical modifications were significant only for the adaxial surface epidermis and palisade parenchyma thickness, this latter characteristic being higher in control plants. Stomatal density and polar and equatorial diameter ratios showed the highest values in plants under water stress. In the roots, differences only in the cortex thickness being bigger in the non-irrigated treatment could be observed. Therefore, Siriema coffee plants under water stress show physiological, biochemical and anatomical modifications that contribute to the tolerance of this genotype to these conditions. Index terms: Coffee tree, ecophysiology, water stress, nitrate reductase. rESuMOEm razão do prognóstico de mudanças climáticas nos próximos anos, a compreensão do déficit hídrico e das respostas fisiológicas de plantas ao mesmo, torna-se uma importante condição para o desenvolvimento de tecnologias, como mecanismos que auxiliem as plantas a suportar períodos mais longos de seca, o que será essencial para a manutenção da produção mundial e brasileira. Neste estudo, objetivou-se avaliar aspectos ecofisiológicos e anatômicos além da atividade da redutase do nitrato em mudas de café Siriema submetidas a quatro tratamentos: irrigadas diariamente, não irrigadas, re-irrigadas 24 horas e re-irrigadas 48 horas após os diferentes períodos de estresse. A ausência de irrigação promoveu redução no potencial hídrico foliar, sendo mais acentuada a partir do nono dia de avaliação. A re-irrigação das mudas promoveu uma recuperação parcial do estado hídrico das plantas. Nas plantas não irrigadas observou-se um aumento na resistência estomatal e diminuição da transpiração, reduzindo a atividade da redutase do nitrato nas folhas. Nas raízes, houve um declínio na redutase do nitrato sob estresse hídrico. Ocorreram modificações na anatomia foliar apenas na espessura da epiderme da face adaxial e parenquimama paliçádico, sendo maior nas plantas controle. A densidade estomatal e razão diâmetro polar e equatorial demonstra...

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Anatomic and physiological modifications in seedlings of Coffea arabica cultivar Siriema under drought conditions

et al. 2014

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“…Aerenchyma is a modified parenchymal tissue related to gas storage and is critical for plant survival in aquatic or flooding environments (Insausti et al, 2001;Vasellati et al, 2001;Pereira et al, 2010). As a consequence, plant genotypes more tolerant to flooding conditions often develop higher aerenchyma proportion (Pereira et al, 2008;Souza et al, 2009).…”

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confidence: 99%

“…Therefore, the greater phloem thickness observed in high population density T. angustifolia may have been induced by competition between individuals, promoting root growth to achieve higher nutrient uptake capacity. Aerenchyma proportion in root cortex also may be related to intraspecific competition, since this characteristic has been seen to increase under environmental stress Coelho et al, 2006;Pereira et al, 2010). Moreover, a higher proportion of root aerenchyma allows greater gas diffusion, mainly oxygen, promoting higher ATP production and growth.…”

Section: Discussionmentioning

confidence: 99%

Anatomical traits related to stress in high density populations of Typha angustifolia L. (Typhaceae)

et al. 2017

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Some macrophytes species show a high growth potential, colonizing large areas on aquatic environments. Cattail (Typha angustifolia L.) uncontrolled growth causes several problems to human activities and local biodiversity, but this also may lead to competition and further problems for this species itself. Thus, the objective of this study was to investigate anatomical modifications on T. angustifolia plants from different population densities, once it can help to understand its biology. Roots and leaves were collected from natural populations growing under high and low densities. These plant materials were fixed and submitted to usual plant microtechnique procedures. Slides were observed and photographed under light microscopy and images were analyzed in the UTHSCSA-Imagetool software. The experimental design was completely randomized with two treatments and ten replicates, data were submitted to one-way ANOVA and Scott-Knott test at p<0.05. Leaves from low density populations showed higher stomatal density and index. These modifications on stomatal characteristics were more evident on the leaf abaxial surface. Plants from low density populations showed thicker mesophyll and higher proportion of aerenchymal area. Roots from low density populations showed a higher proportion of the vascular cylinder. Whereas, plants from higher density populations showed greater thickness of the endodermis, exodermis, phloem and root cortex. Higher density populations showed a higher proportion of aerenchymal gaps in the root cortex. Therefore, cattail plants from populations growing under high density population show anatomical traits typical of plants under stress, which promotes the development of less functional anatomical modifications to aquatic environments.Keywords: anatomical plasticity, cattail, macrophytes, plant handling, eutrophication, stress. Características anatômicas relacionadas ao estresse em altas densidades populacionais de Typha angustifolia L. (Typhaceae)

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“…On Table 2, an increase is seen in the activity of CAT in relation to the control in all treatments of 24 hours; however, in opposition to what happened to the SOD, there was a decrease in the activity of the enzyme in higher concentrations of the metal, as well as in the treatments with SNP. Several factors can affect the catalase activity, such as the stressing toxic agent, its used concentration, the time of exposure and the plant species, which, to a certain extent, can make this enzyme activity be submitted to great variations (Pereira et al, 2010b). This decrease in the CAT activity can also be related to the inhibition of the synthesis of the enzyme in the presence of cadmium.…”

Section: Gsimentioning

confidence: 99%

“…Seeds of Plathymenia reticulata, submitted to accelerated aging, had their germination increased when SNP was applied (Pereira et al, 2010a). In studies with seeds of yellow lupine (Lupinus luteus), Kopyra and Gwózdz (2003) reported that SNP had a considerable effect on the promotion of germination in stress conditions, caused by the presence of lead and cadmium, indicating the efficiency of NO against the negative impact of the heavy metals on germination.…”

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confidence: 99%

Action of nitric oxide in sesame seeds (Sesamum indicum L.) submitted to stress by cadmium

et al. 2016

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-The objective of this paper was to evaluate the effect of nitric oxide (NO) as a protecting agent of sesame seeds submitted to different concentrations of cadmium. The treatments were: water (control), water increased by sodium nitroprusside (SNP) and other treatments regarding the concentrations of cadmium increased by SNP. The following determinations were done: germination, first count of germination, germination speed index, length of hypocotyl and radicle and dry matter of hypocotyl and radicle, besides quantification of enzyme activities, superoxide dismutase, catalase, ascorbate peroxidase and total peroxidases. The statistical design was entirely randomized with five replicates. The data was submitted to a variance analysis and the averages obtained for the treatments were compared by the Tukey test at 5% significance. The averages obtained in the treatments with and without SNP were compared by the F test at 5% probability. The NO due to the application of SNP was beneficial, providing an increase in germination, vigor and growth of seedlings. There was a progressive increase of the antioxidant enzymes activity in the period of 0 to 24 hours, showing an organization of the antioxidant system in the sesame seeds throughout germination time.Index terms: SNP, vigor, germination, antioxidant system. Ação protetora do óxido nítrico em sementes de gergelim (Sesamum indicum L.) submetidas ao estresse por cádmio RESUMO -Objetivou-se avaliar o efeito do óxido nítrico (ON) como agente protetor em sementes de gergelim submetidas a diferentes concentrações de cádmio. Os tratamentos foram: água (controle), água acrescida de nitroprussiato de sódio (SNP) e os demais tratamentos referentes às concentrações de cádmio e cádmio acrescido de SNP. Foram feitas as seguintes determinações: germinação, primeira contagem de germinação, índice de velocidade de germinação, comprimento de hipocótilo e radícula e massa seca de hipocótilo e radícula, além da quantificação da atividade das enzimas, superóxido dismutase, catalase, ascorbato peroxidase e peroxidases totais. O delineamento estatístico utilizado foi o inteiramente casualizado com cinco repetições. Os dados foram submetidos à análise de variância e as médias obtidas para os tratamentos foram comparadas pelo teste de Tukey a 5% de significância. As médias obtidas nos tratamentos com e sem SNP foram comparadas pelo teste F a 5% de probabilidade. O ON devido à aplicação de SNP foi benéfico, proporcionando aumento na germinação, vigor e crescimento de plântulas. Houve aumento progressivo da atividade das enzimas antioxidativas no período de 0 a 24 horas, demonstrando organização do sistema antioxidante nas sementes de gergelim com o decorrer do tempo de germinação.Termos para indexação: SNP, vigor, germinação, sistema antioxidativo.

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Atividade do sistema antioxidante e desenvolvimento de aerênquima em raízes de milho 'Saracura'

Cited by 17 publications

References 26 publications

Anatomic and physiological modifications in seedlings of Coffea arabica cultivar Siriema under drought conditions

Anatomic and physiological modifications in seedlings of Coffea arabica cultivar Siriema under drought conditions

Anatomical traits related to stress in high density populations of Typha angustifolia L. (Typhaceae)

Action of nitric oxide in sesame seeds (Sesamum indicum L.) submitted to stress by cadmium

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