Influence of Nitrate and Ammonium Nutrition on the Uptake, Assimilation, and Distribution of Nutrients in Ricinus communis.
نویسندگان
چکیده
Ricinus communis L. plants were grown in nutrient solutions in which N was supplied as NO(3) (-) or NH(4) (+), the solutions being maintained at pH 5.5. In NO(3) (-)-fed plants excess nutrient anion over cation uptake was equivalent to net OH(-) efflux, and the total charge from NO(3) (-) and SO(4) (2-) reduction equated to the sum of organic anion accumulation plus net OH(-) efflux. In NH(4) (+)-fed plants a large H(+) efflux was recorded in close agreement with excess cation over anion uptake. This H(+) efflux equated to the sum of net cation (NH(4) (+) minus SO(4) (2-)) assimilation plus organic anion accumulation. In vivo nitrate reductase assays revealed that the roots may have the capacity to reduce just under half of the total NO(3) (-) that is taken up and reduced in NO(3) (-)-fed plants. Organic anion concentration in these plants was much higher in the shoots than in the roots. In NH(4) (+)-fed plants absorbed NH(4) (+) was almost exclusively assimilated in the roots. These plants were considerably lower in organic anions than NO(3) (-)-fed plants, but had equal concentrations in shoots and roots. Xylem and phloem saps were collected from plants exposed to both N sources and analyzed for all major contributing ionic and nitrogenous compounds. The results obtained were used to assist in interpreting the ion uptake, assimilation, and accumulation data in terms of shoot/root pH regulation and cycling of nutrients.
منابع مشابه
Promoted growth and improved quality of Gerbera jamesonni L. flowers using exogenous application of amino acids
Commercially available amino acids mixtures have several advantages such as enhancing assimilation of fertilizer, facilitating uptake of water and nutrients and improving photosynthesis of plants. To investigate the response of gerbera (Gerbera jamesonni L.) flowers ‘Saltino’ to foliar application of a mixture of 19 essential amino acids (0.25, 0.50 and 0.75 mg L-1) and ammonium nitrate (200 mg...
متن کاملEffect of Nitrogen and Plant Spacing on Nutrients Uptake,Yield and Growth of Tuberose (Polianthes tuberosa L.)
Plant spacing and nitrogen are the most important factors for increasing tuberose quality and quantity. In this study, field experiment carried out as factorial Randomized Completely Block Design (RCBD) in 3 replications. Different levels of nitrogen (0, 50, 100, 150, 200, 250 kg/ha) of ammonium nitrate was used. Second factor was different plant spaces (10, 15, 20 and 25 cm). Results showed th...
متن کاملProtective Effect of Ricinus communis Leaves Extract on Carbon Tetrachloride Induced Hepatotoxicity in Albino Rats
Ricinus communis Linn. (Euphorbiaceae) is a soft wooded tree widely prevalent throughout tropics regions of the world which have a warm temperature. In the Indian system of medicine, the leaves, roots and seed oil of this plant have been used for the treatment of inflammation and liver disorders for a lo...
متن کاملMarine Ecology Progress Semes
Ammonium and nitrate uptake was measured in 6 European tidal estuaries (Ems. Rhine, Scheldt, Loire, Gironde and Douro) using I5N-tracer techniques. Uptake rates of ammonium and nitrate ranged from 0.005 to 1.56 pmol N 1-' h-I and 0.00025 to 0.25 pmol N 1-' h-I, respectively, and differed significantly between and within estuaries. Analysis of nitrogen uptake using the relative preferential inde...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Plant physiology
دوره 86 3 شماره
صفحات -
تاریخ انتشار 1988