pH control in nitrate uptake studies with excised roots
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چکیده
منابع مشابه
Nitrate uptake and induction of nitrate reductase in excised corn roots.
The characteristics of nitrate uptake and induction of nitrate reductase were studied in excised roots of corn (Zea mays L.). Upon initial exposure to nitrate, the low initial rate of nitrate uptake gradually increased until a steady uptake rate was achieved in 1 to 2 hours depending on the NO(3) (-) concentration. The pattern was observed over a wide range (0.2-5 mm) of nitrate concentrations ...
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The mitotic characteristics of excised roots of the garden pea, Pisum sativum, have been studied under conditions of controlled nutrition. The excised root system was tested with regard to its ability to respond, mitotically, to various carbon sources. Sucrose, glucose, fructose, and DL-glyceraldehyde were found to support mitotic activity in excised roots, galactose and 2-deoxy-D-glucose were ...
متن کاملUptake of rb and k by excised maize roots.
Radioactive isotopes are valuable tools for investigating the uptake and transport of ions by biological material. Their use as tracers provide results that often can be obtained only by such a technique. The reliability of isotopes as tracers, however, is sometimes implicitly accepted. Although the pitfalls are widely known, they are often ignored. The hazards were emphasized for us in the use...
متن کاملPotassium and Nitrate Uptake and Cell Transmembrane Electropotential in Excised Pea Epicotyls'
A bsttract. In contrast to intact etiolated pea seedling tissue (Pisum sativum L.), excised segments immersed in a complete nutrient solution show marked increases in ion content, largely of K+ and NO.-, over a 72-hour period. During this time there is increase in cell electropotential difference, PD. During the initial 6 to 8 hours there is a lag in ion uptake; cell PD, however, increases rapi...
متن کاملRegulation of sulfate uptake by excised barley roots in the presence of selenate.
Active transport of SO(4) (2-) and SeO(4) (2-) has been evaluated during 60-hour contact of barley roots with nutrient solutions containing either (35)SO(4) (2-) or (75)SeO(4) (2-), or both ions, at 0.1 milli-equivalent per liter. In the SO(4) (2-) solution the time course of active transport follows a straight line; if SeO(4) (2-) is also present transport is strongly inhibited after 20 to 30 ...
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ژورنال
عنوان ژورنال: Plant and Soil
سال: 1964
ISSN: 0032-079X,1573-5036
DOI: 10.1007/bf01373603