Diurnal Fluctuations of Nitrate Uptake and In Vivo Nitrate Reductase Activity in Pima and Acala Cotton

Aslam, Muhammad; Travis, R. L.; Rains, D. W.

doi:10.2135/cropsci2001.412372x

Cited by 19 publications

(13 citation statements)

References 40 publications

(78 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, we conclude that photosynthetic products play an important role in NO 3 -N absorption over a longer period. Previous studies have assumed that photosynthetic products are involved in the NO 3 -N absorption via nitrate assimilation process (Aslam et al, 1979(Aslam et al, , 2001Cárdenas-Navarro et al, 1998;Dechorgnat et al, 2011;Delhon et al, 1996;Li et al, 2013;Rideout and Raper Jnr, 1994). Hence, the factors affecting NO 3 -N uptake may include transpiration and plant photosynthesis.…”

Section: Factors Affecting No 3 -N Absorptionmentioning

confidence: 99%

Diurnal changes in nitrogen and potassium absorption rates of plants grown in a greenhouse

Okuyama¹,

Ozawa

Takagaki

2015

J. Agric. Meteorol.

View full text Add to dashboard Cite

In order to increase the efficiency of nutrient utilization in solution culture systems, it is indispensable to understand how plants absorb nutrients. A series of experiments were conducted using hydroponic culture system in the first to third experiments and soil culture system in the fourth experiment in a greenhouse in Okinawa, Japan. In the first experiment, changes in NO 3 -N absorption were measured every three hours during a 24-hour period on 40 days after transplanting (DAT) in cucumber. In the second experiment, daytime and nighttime NO 3 -N absorption were measured from 45 to 48 DAT in five crops including cucumber. In the third experiment, NO 3 -N, NH 4 -N, and K absorption in daytime, nighttime and shaded conditions were determined from 30 to 34 DAT in bitter gourd, a substitute crop for cucumber, and water spinach. In the fourth experiment, daytime and nighttime (NH 4 ) 2 SO 4 -15 N absorption rates were measured from 9 to 12 DAT in cucumber. The results showed that daily NO 3 -N absorption in cucumber peaked twice, just before midday and again just after the nightfall. The corresponding fluctuation pattern was observed in all other tested crops, with 20-41% of the total absorption occurring at night. Absorption rate of 15N in cucumber cultivated in soil also increased in daytime and decreased at night, with the nighttime rate accounting for 39-40% of the daily total absorption. The average nighttime NO 3 -N, NH 4 -N, and K absorption percentages of the daily total before shading the plant were 34-35%, 49-51%, and 33-49%, respectively. During the shaded period, these nutrient absorption rates dramatically decreased, except for NH 4 -N which was not affected by shading. Across all experiments, 20-51% of total absorption took place at night, the majority of which may concentrate around the early nighttime. Furthermore, the absorption rates may be influenced by photosynthetic products.

show abstract

Section: Factors Affecting No 3 -N Absorptionmentioning

confidence: 99%

Diurnal changes in nitrogen and potassium absorption rates of plants grown in a greenhouse

Okuyama¹,

Ozawa

Takagaki

2015

J. Agric. Meteorol.

View full text Add to dashboard Cite

show abstract

“…NR, the first key enzyme of NO 3 ( assimilation, can regulate plant N nutrition and affects plant physiology including photosynthesis and carbon assimilation. NR activity may vary in different plant organs and developmental stages (Sun and Yan 2004) and show diurnal variation rhythm with the maximum activity occurring around mid day (Aslam et al 2001;Sun and Yan 2004). Leaf NRA did not show any obvious correlation with leaf area and/or lamina mass per unit area in Camptotheca accuminata seedlings (Sun and Yan 2004).…”

Section: Photosynthetic Responsesmentioning

confidence: 89%

Behavioral responses of leaves and vascular cambium ofProsopis cineraria(L.) Druce to different regimes of coal-smoke pollution

Iqbal

Mahmooduzzafar

Aref

et al. 2010

Journal of Plant Interactions

View full text Add to dashboard Cite

The foliar and cambial responses of Prosopis cineraria to five different coal-smoke regimes in Delhi, India, were studied using the monthly collections of leaves and cambial blocks as well as the data on SO 2 , NO 2 and particulate concentrations from each of the five study sites. Coal-smoke inhibited pigment concentration, NR activity and sugar content and promoted stomatal index and the nitrate and sulfur contents. Stomatal conductance was low, leading to a drop in the net photosynthetic rate. Cambial activity started quite late and the annual increment of wood was reduced despite a prolonged active phase, possibly due to a distinctly retarded rate of cambial cell division. Vessel proportion in the wood increased but the size of vessel elements and fibers decreased. Such studies may help in identifying trees suitable for cultivation in the pollutionaffected areas.

show abstract

“…After 6 d, the seedlings were transferred to a stainless steel screen (mesh size 5 mm × 5 mm) suspended ≈5 cm above the surface of 5 L aerated N‐free, one‐quarter‐strength Hoagland solution (Hoagland and Arnon, 1950) contained in a plastic beaker. To avoid diurnal fluctuations in NO − 3 uptake due to light/ dark transitions and temperature (Aslam et al, 2001), the seedlings were transferred into a growth chamber (Western Environmental, Napa, CA) set for continuous light and 28°C with 60 to 65% relative humidity. Light was supplied by metal halide and incandescent lamps.…”

Section: Methodsmentioning

confidence: 99%

Inhibition of Net Nitrate Uptake by Ammonium in Pima and Acala Cotton Roots

2001

View full text Add to dashboard Cite

This study was conducted to determine whether the inhibition of net NO−3 uptake by NH+ 4 in cotton roots is due to inhibition of NO− 3 influx per se, and/or enhancement of efflux. Two cotton species, Pima (Gossypium barbadense L.) and Acala (G. hirsutum L.), which differ in NO− 3 influx and efflux, were used. Seedlings were grown hydroponically for 10 to 11 d and then induced for NO− 3 uptake with 0.01, 0.10, or 1.0 mM NO− 3 Net uptake was determined by following NO− 3 depletion from uptake solutions, containing 0.1 mM NO− 3, in the presence or absence of 10 mM NH+ 4 Roots induced with 0.01 mM NO− 3 contained only 5 to 6 μmol NO− 3 g−1 fresh weight (FW) after the induction treatment. In these roots, net NO− 3 uptake was equivalent to influx, and was not inhibited by NH+ 4 Roots induced with 0.1 mM NO− 3 contained 36 to 38 μmol NO− 3 g−1 FW, and NH+ 4 inhibited net NO− 3 uptake albeit after a lag of ≈12 min. In contrast, roots induced with 1.0 mM NO− 3 contained 65 μmol NO− 3 g−1 FW, and NH+ 4 immediately inhibited net uptake. Exposure to NH+ 4 increased NO− 3 efflux by both species. At similar root NO− 3 concentrations, NH+ 4 inhibited net NO− 3 uptake and stimulated efflux more in Pima than in Acala cotton. These results indicate that the response of both cotton species to NH+ 4 is dependent upon root NO− 3 concentration, and supports the argument that NH+ 4 has little effect on NO− 3 influx, but inhibits net uptake by stimulating efflux.

show abstract

Diurnal Fluctuations of Nitrate Uptake and In Vivo Nitrate Reductase Activity in Pima and Acala Cotton

Cited by 19 publications

References 40 publications

Diurnal changes in nitrogen and potassium absorption rates of plants grown in a greenhouse

Diurnal changes in nitrogen and potassium absorption rates of plants grown in a greenhouse

Behavioral responses of leaves and vascular cambium ofProsopis cineraria(L.) Druce to different regimes of coal-smoke pollution

Inhibition of Net Nitrate Uptake by Ammonium in Pima and Acala Cotton Roots

Contact Info

Product

Resources

About