Uptake of Rubidium Ion in Different Plant Exposed to Sudden Fall in Temperature

Abstract

Many investigators have studied the influence of low temperature on ion upcake in diffenent plants (Cseh and Boszormtnyi 1964, Korouin, Sucheva and Bystrova 1963, Oberlander 1963, Sutcliffe 1962, Wallace 1963, Zhurbitzky and Shtrausberg 1958. It is a general opinion that rhe intensity of the uptake of nutrienrs varies according to the temperature, but considerable differences can be found in the absorption concerning different ions (Saric and C u~i c 1963). According to Kramer (1949) this can be best explained that there are differences in the viscosity of the plasma and in the alteration of membrane system of the cells at low temperatures.We have reported earlier that in young rice roots the Rb ion uptake decreases only up to 8 O C , but towards O O C , it increases again (Zsoldos 1967).Under similar circumstances the phosphate and bromide anions did not show this peculiarity, as their uptake is proportionately changed according to the changes in temperature.The unusual results with Rb ions may be explained by the so-called cold shock effect which causes considerable changes in the permeability of the membranes, owing mainly to the sudden fall of temperature.Since at low temperature, more exactly under the influence of a sudden fall in temperature, the results of Rb ion uptake in rice roots are rather surprising, we continued our investigations with various species of plants. M a t e r i a l a n d M e t h o d sThe species of plants used were as follows: Cucumber (Szenzici6), sorghum (Advance-2), sugar melon (Honey-Rock), maize (MV-l), rice (Dunghan Shali), millet, wfinter wheat (F-481) and spring barley. The plants were grown up to 6-9 days (stage with 1-2 leaves) in a light thermosrat (at 6500 Lux) in a lo-, M solution of CaSO,. Excised roots were used for the examination at different temperatures, pH 5,5. The excised roots were kept in distilled water for 30 minutes before placing in aerated 12

The Influence of pH and Temperature on Rubidium/Potassium Ion Absorption and Exchange by Roots

“…The present work was done with plants sensitive to cold (rice and sorghum), where the "cold-shock" effect has already been noticed previously (Zsoldos 1968a). Seedlings were grown for 6-8 days (up to 1-2 leaves) in tap water, later in 5 lo-' M CaSO, solution under controlled conditions.…”

Measurement of changes in total plant composition of five ions simultaneously by emission spectrography

“…This was the major purpose of the study. The temperature variable was included because so little is really known about the matter (1,7,9,11,12) Several interesting phenomena are apparent in the data. At 24 C the newly absorbed P and K were reasonably uniformly distributed between root and shoot.…”

Membrane and ion transport properties in cereals under acidic and alkaline stress

“…Potassium plays an essential role in maintaining the structure and biological functioning of cells. K^C^Rb) uptake in oold-resistant and thermophilic plant roots has been extensively studied (Erdei and Zsoldos 1977, Erdei et al 1977, 1981, Zsoldos 1968, 1972, Zsoldos and Karvaly 1978 under different stress conditions. The responses to pH stress in growth, K* uptake and membrane compositions of winter wheat and rice roots have been compared (Erdei e( al.…”