2000
DOI: 10.1590/s0103-90162000000200013
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Abstract: A atividade da redutase do nitrato foi estudada em plantas de algodão (Gossypium hirsutum, L.), cvs IAC 20 e IAC 13-1, submetidas a déficits crescentes de água, e posterior recuperação da turgescência. A atividade fisiológica das folhas, representada pela atividade da enzima, sofreu redução quando o y a foi menor que -1,5 MPa. Não ocorreram diferenças significativas entre os dois cultivares em relação ao estabelecimento do estresse, nem tampouco quanto ao padrão de recuperação da turgescência em plantas estres… Show more

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Cited by 5 publications
(5 citation statements)
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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%
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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%
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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 …”
mentioning
confidence: 99%