Adubação do cafeeiro com nitrato de potássio via solo e folha, no outono-inverno e primavera-verão: efeitos na atividade da redutase do nitrato, no crescimento das plantas e na produção

Freitas, Rupert Barros de; Alves, José Donizeti; Magalhães, Marcelo Murad; Goulart, Patrícia de Fátima Pereira; Nascimento, Marilza Neves do; Fries, Daniela Deitos

doi:10.1590/s1413-70542007000400001

Cited by 5 publications

(4 citation statements)

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“…The nitrate reductase activity is highly modulated by environmental factors, such as: radiation, temperature, nitrate and water (Freitas et al, 2007;Carelli;Fahl, 2006). The presence of nitrate in the soil promotes stimulation to de novo synthesis of the referred enzyme, however if the plant undergoes a situation of hydric stress its activity can be reduced (Marur;Mazzafera;Magalhães, 2000).…”

Section: Leaf Water Potentialmentioning

confidence: 99%

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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Section: Leaf Water Potentialmentioning

confidence: 99%

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

et al. 2014

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“…It is normal for the nitrate reductase enzyme to show a reduction in its activity with the advancement of stress due to water deficit. According to Freitas et al (2007), when going through a situation of moderate water stress, even with nitrate levels, the plant can reduce its enzymatic activity to 20% due to other factors. For example, high amounts of glutamine can negatively affect the expression of the nitrate reductase enzyme, decreasing its activity.…”

Section: Resultsmentioning

confidence: 99%

Metabolic alterations in cowpea submitted to water stress

Costa,

Martins,

Machado

et al. 2024

CLCS

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Cowpea is a leguminous plant belonging to the fabaceae family cultivated in the North and Northeast regions of Brazil, with productive potential. Among the abiotic factors, water deficiency is one of the main environmental limitations that influence agricultural production in the world. The objective was to evaluate changes in carbon and nitrogen metabolism in cowpea plants exposed to water deficit. The experiment was conducted in a greenhouse at the Universidade Federal Rural da Amazônia (UFRA, Belém, PA), cowpea plants BR-17 Gurguéia Vigna unguiculata (L.) Walp were used. The experimental design was completely randomized (DIC) in a 2 x 2 factorial scheme, two water conditions (control and water deficit) and two times of stress (four and six days of water suspension), with 7 replications, totaling 28 experimental units. Changes in the metabolism of cowpea plants were evident, with alterations in the activity of the nitrate reductase enzyme, concentrations of total soluble proteins, soluble amino acids, free ammonium and nitrate in the leaf tissue and roots.

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“…Além disso, a atividade da enzima neste período correlacionou positivamente com a dose de N. Freitas et al (2007)…”

Section: Objetivos Específicos unclassified

Metabolismo do nitrogênio e concentração de nutrientes no cafeeiro irrigado em razão da dose de N

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Adubação do cafeeiro com nitrato de potássio via solo e folha, no outono-inverno e primavera-verão: efeitos na atividade da redutase do nitrato, no crescimento das plantas e na produção

Cited by 5 publications

References 0 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

Metabolic alterations in cowpea submitted to water stress

Metabolismo do nitrogênio e concentração de nutrientes no cafeeiro irrigado em razão da dose de N

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