Influence of fruit load and environmental factors on nitrate reductase activity and on concentration of nitrate and carbohydrates in leaves of eggplant (<i>Solanum melongena</i>)

Claußen, W.

doi:10.1111/j.1399-3054.1986.tb01265.x

Cited by 13 publications

(6 citation statements)

References 29 publications

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“…The activity of NR has often been shown to Tab. 4 (Claussen, 1986). A positive correlation between NR activity and NO 3 concentration in the leaf tissues implies that the activity of NR is induced by increasing NO 3 concentration, as it has been reported by Sivaasankar and Oaks (1996).…”

Section: Methodssupporting

confidence: 55%

Effects of Salinity and NO3:NH4 Ratio on Yield and Quality in Canola (Brassica napus L.)

2009

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The effect of salinity and NO 3 : NH 4 ratio (0:100, 75: 25, 50:50 and 25:75) in the nutrient solution on growth, yield quality and N metabolism in hydroponically grow canola (Brassica napus L.) was evaluation. Both fresh and dry weights of leaves were significantly lower when a high concentration of either NO 3 (100%) or NH 4 (75%) was the sole N source in the nutrient solution. In nonsaline condition, increasing of both NH 4 and NO 3 ratio in the nutrient solution reduced photosynthetic (pn) rate, however in salinity condition the reduction of pn became more pronounced at a higher ratio of NH 4 in the nutrient solution. The yield in terms of fresh and dry weight of seed per plant was significantly increased at the 75:25 (NO 3 : NH 4 ) treatments. Total fat in nonsaline condition was increased with increasing NH 4 ratio in the nutrient solution, however in saline condition it was reduced, at high NH 4 ratio in the nutrient solution. The increase of tissue N concentration was nearly proportional to the NH 4 concentration in the nutrient solution. The activity of nitrate reductase (NR) was increased by increasing NH 4 form 0 to 50% and then reduced at a higher ratio of NH 4 in the solution. Salinity increased NH 4 concentration so that the saline condition had nearly twice high NH 4 concentration in the leaves. The increase of NH 4 concentration induced by salinity could be parially the reduction of NH 4 assimilate because of the shortage of carbohydrate.

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Section: Methodssupporting

confidence: 55%

Effects of Salinity and NO3:NH4 Ratio on Yield and Quality in Canola (Brassica napus L.)

2009

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“…With a low nitrate supply NRA of leaves is generally lower than that of the roots (Andrews, 1986;Pate, 1983;Smirnoff and Stewart, 1985). NRA in young leaves was higher than in old and intermediate leaves, as generally observed (Carelli and Magalhaes, 1981;Claussen, 1986;Doddema et aL, 1986). But after week 10 this difference disappeared, again suggesting that hardly any newly absorbed nitrate reached the leaves from then on.…”

Section: Nitrogen Depletion In Plantago 203supporting

confidence: 61%

The response ofPlantago lanceolata L. andP. major L. spp.major to nitrate depletion

Blacquière

Koetsier

1988

Plant Soil

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To study aspects of the ecology of grassland species, in a comparative experiment, plants of P. lanceolata and P. major were grown in pots in a greenhouse, and subjected to a gradual nitrate depletion for several weeks. Control plants were weekly supplied with nitrate. Growth, leaf appearance and disappearance, concentrations of cations and inorganic anions, soluble and insoluble reduced nitrogen concentrations, in vivo nitrate reductase activity (NRA) and the concentration of non-structural carbohydrates in several parts of the plants were followed. Depletion of nitrate caused a reduction of shoot growth, both in biomass and number of leaves. Withering of leaves increased. Accumulation of root dry matter was little (P. lanceolata), or not (P. major) affected. The concentration of reduced nitrogen in all tissues also decreased, both that of the soluble and that of the insoluble fraction. As a result, nitrogen use efficiency (NUE, g dry matter produced per mmol N incorporated) increased by nitrate depletion. NRA was higher in the roots than in the leaves, and decreased with increasing nitrate depletion.In control plants, nitrate became also limiting. This resulted in decreasing nitrate concentrations in leaves and roots. In the leaves, the decrease in nitrate concentration was preceded by a decrease in NRA. The decrease of the nitrate concentration was parallelled by an increase in the concentration of soluble sugar.No major differences in the response towards nitrate depletion were observed between the two species.

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“…2), and the nitrate content of the leaves increased when little or no nitrate was detectable in the leaves of plants without fruits (Claussen, 1986). It was concluded that the higher concentrations of nitrate in leaves of eggplants with fruits were due to their low carbohydrate content, which in turn had been caused by the rapid transport of photosynthates to the growing fruit (Claussen, 1986). Since, in contrast to nitrate, an accumulation of large quantities of ammonium nitrogen in leaves did not occur, fruit-bearing plants must have detoxified this nitrogen after its absorption from the nutrient solution.…”

Section: Discussionmentioning

confidence: 99%

“…During the course of fruit growth, eggplants also accumulate nitrate in the leaves. However, as soon as fruits are removed, the concentration of nitrate falls rapidly (Claussen, 1986). The decrease in nitrate concentration is accompanied by an increase in the carbohydrate level in leaves followed by the initiation of vegetative growth and flower set.…”

Section: Introductionmentioning

confidence: 99%

Effect of ammonium and nitrate on net photosynthesis, flower formation, growth and yield of eggplants (Solanum melongena L.)

Claußen

Lenz

1995

Plant Soil

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Eggplants (Solanum melongena L. cv. Bonica) were grown in a glasshouse during summer under natural light with one unbranched shoot or one shoot with 3 to 4 branches and with or without fruit in quartz sand buffered and not buffered with 0.5% CaCO3 (w : v), respectively. Nutrient solutions supplied contained nitrate or ammonium as the sole nitrogen source.Compared with nutrient solutions containing nitrate (10 mM), solutions containing ammonium (10 mM) caused a decrease in net photosynthesis of eggplants during early stages of vegetative growth when grown in quartz sand not buffered with CaCO3. The decrease was not observed before leaves showed interveinal chlorosis. In contrast, net photosynthesis after bloom at first increased more rapidly in eggplants supplied with ammonium than with nitrate nitrogen. However, even in this case, net photosynthesis decreased four weeks later when ammonium nutrition was continued. The decrease was accompanied by epinasty and interveinal chlorosis on the lower leaves and later by severe wilting, leaf drop, stem lesions, and hampered growth of stems, roots, and fruits. These symptoms appeared later on plants not bearing fruits than on plants bearing fruits. If nutrient solutions containing increasing concentrations of ammonium (0.5 -30 mM) were supplied after the time of first fruit ripening, shoot growth and set of later flowers and fruits were promoted. In contrast, vegetative growth and reproduction was only slightly affected by increasing the concentration of nitrate in the nutrient solutions.In quartz sand buffered with CaCO3 ammonium nutrition caused deleterious effects only under low light conditions (shade) and on young plants during rapid fruit growth. If eggplants were supplied with ammonium nitrogen before bloom, vegetative growth was promoted, and set of flowers and fruit occurred earlier than on plants supplied with nitrate. Furthermore, the number of flowers and fruit yield increased. These effects of ammonium nutrition were more pronounced when plants were grown with branched shoots than with unbranched shoots.The results indicate that vegetative and reproductive growth of eggplants may be manipulated without causing injury to the plants by supplying ammonium nitrogen as long as the age of the plants, carbohydrate reserves of the roots, quantity of ammonium nitrogen supplied, and pH of the growth medium are favourable.

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Influence of fruit load and environmental factors on nitrate reductase activity and on concentration of nitrate and carbohydrates in leaves of eggplant (Solanum melongena)

Cited by 13 publications

References 29 publications

Effects of Salinity and NO3:NH4 Ratio on Yield and Quality in Canola (Brassica napus L.)

Effects of Salinity and NO3:NH4 Ratio on Yield and Quality in Canola (Brassica napus L.)

The response ofPlantago lanceolata L. andP. major L. spp.major to nitrate depletion

Effect of ammonium and nitrate on net photosynthesis, flower formation, growth and yield of eggplants (Solanum melongena L.)

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