Nitrate reductase activity of seven local corn cultivars from south west maluku district during water stress caused by polyethylene glycol 6000 under green house condition

2021 ◽

Author(s):

Xudong Zhang ◽

Bastian L. Franzisky ◽

Lars Eigner ◽

Christoph‐Martin Geilfus ◽

Christian Zörb

Keyword(s):

Zea Mays ◽

Polyethylene Glycol ◽

Nitrate Reductase ◽

Osmotic Stress ◽

Nitrate Reductase Activity ◽

Reductase Activity ◽

Shoot Biomass ◽

Lower Intensity ◽

Maize Variety ◽

Osmotic Balance

AbstractChloride (Cl−) is required for photosynthesis and regulates osmotic balance. However, excess Cl− application negatively interacts with nitrate ($${\mathrm{NO}}_{3}^{-}$$ NO 3 - ) uptake, although its effect on $${\mathrm{NO}}_{3}^{-}$$ NO 3 - metabolism remains unclear. The aim was to test whether Cl− stress disturbs nitrate reductase activity (NRA). A maize variety (Zea mays L. cv. LG 30215) was hydroponically cultured in a greenhouse under the following conditions: control (2 mM CaCl2), moderate Cl− (10 mM CaCl2), high Cl− (60 mM CaCl2). To substantiate the effect of Cl− stress further, an osmotic stress with lower intensity was induced by 60 g polyethylene glycol (PEG) 6000 L−1 + 2 mM CaCl2), which was 57% of the osmotic pressure being produced by 60 mM CaCl2. Results show that high Cl− and PEG-induced osmotic stress significantly reduced shoot biomass, stomatal conductance and transpiration rate, but NRA was only decreased by high Cl− stress. The interference of NRA in chloride-stressed maize is supposed to be primarily caused by the antagonistic uptake of Cl− and $${\mathrm{NO}}_{3}^{-}$$ NO 3 - .

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Nitrate Reductase Activity of Wheat Seedlings during Exposure to and Recovery from Water Stress and Salinity

Physiologia Plantarum ◽

10.1111/j.1399-3054.1974.tb03646.x ◽

1974 ◽

Vol 30 (3) ◽

pp. 212-217 ◽

Cited By ~ 52

Author(s):

ZVI PLAUT

Keyword(s):

Water Stress ◽

Nitrate Reductase ◽

Nitrate Reductase Activity ◽

Reductase Activity ◽

Wheat Seedlings

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

Ciência e Agrotecnologia ◽

10.1590/s1413-70542014000100003 ◽

2014 ◽

Vol 38 (1) ◽

pp. 25-33 ◽

Cited By ~ 5

Author(s):

Emanuelle Ferreira Melo ◽

Christiane Noronha Fernandes-Brum ◽

Fabrício José Pereira ◽

Evaristo Mauro de Castro ◽

Antonio Chalfun-Júnior

Keyword(s):

Water Stress ◽

Nitrate Reductase ◽

Water Potential ◽

Nitrate Reductase Activity ◽

Stomatal Density ◽

Reductase Activity ◽

Stomatal Resistance ◽

Partial Recovery ◽

Worldwide Production ◽

Weather Changes

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.

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