نتایج جستجو برای: nitrate uptake

تعداد نتایج: 162380  

Journal: :Plant physiology 1975
D A Ashley W A Jackson R J Volk

Nitrate uptake, reduction, and translocation were examined in intact, 14-day-old, nitrogen-depleted wheat (Triticum vulgare var. Knox) seedlings during a 9-hour exposure to 0.2 mm Ca (NO(3))(2). The nitrate uptake rate was low during the initial 3-hour period, increased during the 3- to 6-hour period, and then declined. By the 3rd hour, 14% of the absorbed nitrate had been reduced, and this inc...

حق نیا, غلامحسین, خراسانی, رضا, قشلاقی, زهرا, کافی, محمد,

Leafy vegetables are considered as the main sources of nitrate in the human diet. In order to investigate the effect of nitrate levels and harvest times on nitrate accumulation, nitrate reductase activity, concentrations of Fe, Zn, Cu and K in Lettuce and Spinach and their relation to nitrate accumulation in these leafy vegetables, two harvest times (29 and 46 days after transplanting), two veg...

2009
Astrid Volder Laurel J. Anderson David R. Smart Arnold J. Bloom Alan N. Lakso David M. Eissenstat

We only have a limited understanding of the nutrient uptake physiology of individual roots as they age. Despite this shortcoming, the importance of nutrient uptake processes to our understanding of plant nutrition and nutrient cycling cannot be underestimated. In this study, we used a N depletion method that allowed for the measurement of nitrate-N uptake rates on intact, individual, fine roots...

2014
Chunsun Gu Xiaoxue Zhang Jiafu Jiang Zhiyong Guan Shuang Zhao Weimin Fang Yuan Liao Sumei Chen Fadi Chen

Nitrate transporters are an important component of plant growth and development. Chrysanthemum morifolium is an important ornamental species, for which a sufficient supply of nitrogenous fertilizer is required to maintain economic yields. In this study, the full-length cDNA of the nitrate transporter genes CmNRT2 and CmNAR2 were isolated. CmNRT2 transcript accumulation was inducible by both nit...

2010
Sandra Jämtgård

The ability of plants to take up amino acids is widespread among plants, but the ecological and physiological implications of this ability are not fully understood. Therefore, in the investigations this thesis is based upon, key aspects of the uptake of amino acids by agricultural plants were explored in field studies (to ensure ecological relevance) and laboratory analyses (to ensure precision...

Journal: :Plant physiology 1990
P R McClure L V Kochian R M Spanswick J E Shaff

The electrical response of nitrate-grown maize (Zea mays L.) roots to 0.1 millimolar nitrate was comprised of two sequential parts: a rapid and transient depolarization of the membrane potential, followed by a slower, net hyperpolarization to a value more negative than the original resting potential. The magnitude of the response was smaller in roots of seedlings grown in the absence of nitrate...

Journal: :پژوهش های زراعی ایران 0
سمیرا تندیسه بنا علی رضا آستارایی حجت امامی

introduction soil salinity is a major limiting factor in agricultural development within iran. nitrogen is the most important nutrient that its uptake is limited over other elements under saline conditions due to decrease in the permeability of plant roots, soil microbial activity and mineralization of organic compounds and nitrate uptake by high concentrations of chloride anions in the root zo...

Journal: :Blood 1992
C R Chitambar D Sax

Gallium, a pharmacologically important metal, resembles iron with respect to transferrin (Tf) binding and Tf receptor-mediated cellular uptake. In the present study, we examined the effect of gallium on Tf-independent iron uptake by HL60 cells. In contrast to the inhibitory effect of Tf-gallium on Tf-iron uptake, gallium nitrate, in a time-, temperature-, and concentration-dependent manner, sti...

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