Atividade da enzima redutase do nitrato em algodoeiro submetido ao déficit hídrico e posterior recuperação da turgescência

Marur, Celso Jamil; Mazzafera, Paulo; Magalhães, Antonio Celso Novaes de

doi:10.1590/s0103-90162000000200013

Cited by 5 publications

(5 citation statements)

References 16 publications

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“…In adaptation studies of cultures to low precipitations areas, the main objective is the increase of productivity associated to rational and economical water use, however, according to Maseda and Fernández (2006), there is the risk of complete exhaustion of the water available in the soil, with serious structural and physiological damage to the tissues. The transpiration rate, variable according to the different hydric regimes, shows that the plant can activate water loss defense mechanisms when soil moisture is deficient.…”

Section: Leaf Water Potentialmentioning

confidence: 99%

“…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). The availability of (NO 3 -) is one of the main factors that can modify the NR activity (Lima et al, 2008).…”

Section: Leaf Water Potentialmentioning

confidence: 99%

“…Agrotec., Lavras, v.38, n. 1, p.25-33, jan./fev., 2014 Nevertheless, longer periods of drought are becoming more common and can severely affect plant growth and production yield (Arruda; Grande, 2003). A physiological response sensitive to the water potential decrease is the modification in protein synthesis and, due to that, enzymes such as Nitrate Reductase (NR) are strongly inhibited (Marur;Mazzafera;Magalhães, 2000). The NR has been used in the evaluation of modifications related to environmental factors, for instance: radiation, hydric status and nitrogen availability (Marur;Mazzafera;Magalhães, 2000;Carelli;Fahl, 2006;Lima et al, 2008).…”

mentioning

confidence: 99%

“…The water deficit can be related to significant restrictions in carbon assimilation by plants, and adaptation of tolerant plants to such conditions involve physiological and anatomical modifications (Maseda;Fernández, 2006).…”

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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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Section: Leaf Water Potentialmentioning

confidence: 99%

Section: Leaf Water Potentialmentioning

confidence: 99%

mentioning

confidence: 99%

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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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“…The lowest N content in seedlings under WR is possibly due to the reduction in the activity of enzyme, the nitrate reductase, which is negatively affected by low water availability in the soil and by water potential in the plant, affecting N assimilation(Marur et al al., 2000;Oliveira et al, 2005), and consequently harming the synthesis of other compounds and vegetative growth.According toMalavolta et al (1997) Ca in lower concentration in the plant tissue presents a synergistic relationship with K, this fact was veri ed in our study with I. edulis during the stress condition (WR), while there was increase of K for control seedlings resulting in competitive inhibition for Ca and Mg. In addition, we suggest that the lowest K contents in seedlings grown under WR and WR + 15 mL L− 1 …”

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confidence: 99%

Ascophyllum nodosum seaweed extract in Inga edulis seedlings under drought and the potential of phenotypic plasticity

Santos

Silva

Oliveira

et al. 2023

Preprint

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Studies aiming alleviating the effect of drought on plants have increased, and the use of seaweed extract has been a sustainable and promising management for stress tolerance. Thus, this work aimed to evaluate the role of Ascophyllum nodosum (L.) Le Jolis seaweed extract (ANE) in Inga edulis Mart. seedlings under drought and post-stress. The seedlings were cultivated under: 1) control (daily irrigation), 2) drought by water restriction – WR (irrigation suspension), 3) WR + 15 mL L-1 ANE, 4) WR + 30 mL L-1 ANE, and 5) WR + 45 mL L-1 ANE, and evaluated in two periods: i) SWD - when the seedlings showed symptoms of water deficit, and ii) REC: recovery (post-stress) - resumption of irrigation for 60 days. The application of 45 mL ANE contributed to the N content of seedlings under drought and post-stress. The order of nutritional requirement was similar for N, Ca, and Mg, but P and K varied according to the evaluation periods under drought. The application of 30 and 45 mL L-1 ANE contributed in the post-stress, favoring the quantum efficiency of photosystem II in response to the higher nutrient content in plant tissue, reflecting on growth in the REC. ANE increased proline content as osmoprotection mechanism during SWD and promoted an efficient recovery. The application of 30 and 45 mL ANE contributes to induction of stress tolerance in I. edulis seedlings under drought, and it favors recovery of plants in the post-stress due to phenotypic plasticity, which becomes a promising management for this species.

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Ascophyllum nodosum seaweed extract in Inga edulis seedlings under drought and the potential of phenotypic plasticity

Santos,

Silva,

Carvalho de Oliveira

et al. 2023

J Appl Phycol

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Studies aiming alleviating the effect of drought on plants have increased, and the use of seaweed extract has been a sustainable and promising management for stress tolerance. Thus, this work aimed to evaluate the role of Ascophyllum nodosum (L.) Le Jolis seaweed extract (ANE) in Inga edulis Mart. seedlings under drought and post-stress. The seedlings were cultivated under: 1) control (daily irrigation), 2) drought by water restriction -WR (irrigation suspension), 3) WR + 15 mL L -1 ANE, 4) WR + 30 mL L -1 ANE, and 5) WR + 45 mL L -1 ANE, and evaluated in two periods: i) SWD -when the seedlings showed symptoms of water de cit, and ii) REC: recovery (post-stress) -resumption of irrigation for 60 days. The application of 45 mL ANE contributed to the N content of seedlings under drought and post-stress. The order of nutritional requirement was similar for N, Ca, and Mg, but P and K varied according to the evaluation periods under drought. The application of 30 and 45 mL L -1 ANE contributed in the post-stress, favoring the quantum e ciency of photosystem II in response to the higher nutrient content in plant tissue, re ecting on growth in the REC. ANE increased proline content as osmoprotection mechanism during SWD and promoted an e cient recovery. The application of 30 and 45 mL ANE contributes to induction of stress tolerance in I. edulis seedlings under drought, and it favors recovery of plants in the post-stress due to phenotypic plasticity, which becomes a promising management for this species.

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Atividade da enzima redutase do nitrato em algodoeiro submetido ao déficit hídrico e posterior recuperação da turgescência

Cited by 5 publications

References 16 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

Ascophyllum nodosum seaweed extract in Inga edulis seedlings under drought and the potential of phenotypic plasticity

Ascophyllum nodosum seaweed extract in Inga edulis seedlings under drought and the potential of phenotypic plasticity

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