Reference

Ion transport regulation in the life cycle of wheat

Ion transport regulation in the life cycle of wheat. Erdei, Laszlo; Berczi, Alajos; Olah, Zoltan (Szegedi Biol. Kozp., MTA, Szeged, Hung.). Magy. Tud. Akad. Biol. Tud. Oszt. Kozl. 7723-14-0 and 7440-09-7 which are cas registry numbers are also used here., 25(4), 595-607 (Hungarian) 1982. CODEN: MTKZAI. ISSN: 0025-0333. DOCUMENT TYPE: Journal CA Section: 11 (Plant Biochemistry) Growth foliar surface, water, K, and P and Na content, and K+ (86Rb) and P (H232PO4-) uptake and transport were studied during the development of wheat, both in hydroponic culture and in the field. The dynamics of growth and foliar surface development were different for the 2 culture conditions. The K+ content in the shoot was max. at 80 days, in both cultures. The Na content showed a sharp max. at 100-120 days, in the roots, in hydroponic culture only. A very sharp peak was shown in K+ and P transport from the root to the shoot at 150 days, under both culture conditions. .

X-ray microanalysis of elements in frozen-hydrated sections of an electrogenic potassium transport system: the posterior midgut of tobacco hornworm (Manduca sexta) in vivo and in vitro

X-ray microanalysis of elements in frozen-hydrated sections of an electrogenic potassium transport system: the posterior midgut of tobacco hornworm (Manduca sexta) in vivo and in vitro. Dow, Julian A. T.; Gupta, Brij L.; Hall, Theodore A.; Harvey, William R. (Dep. Zool., Univ. Cambridge, Cambridge CB2 3EJ, UK). J. 16887-00-6 and 7723-14-0 are cas registry numbers. These chemicals are also mentioned in this article. Membr. Biol., 77(3), 223-41 (English) 1984. CODEN: JMBBBO. ISSN: 0022-2631. DOCUMENT TYPE: Journal CA Section: 12 (Nonmammalian Biochemistry) Electron probe x-ray microanal. of frozen-hydrated cryosections was used to measure the concns. of Na, Mg, P, S, Cl, K, Ca, and H2O in several subcellular sites in the larval midgut of M. sexta under several exptl. regimes. Na was undetectable at any site. K was 3100 mM in the cytoplasm of all cells. Typical in vivo values (mM) for K were: blood, 25; goblet and columnar cytoplasm, 120; goblet cavity, 190; and gut lumen, 180. The high K concn. in the apically located goblet cavity declined by 100 mM under anoxia. Both cavity and gut fluid are Cl deficient, but fixed neg. charges may be present in the cavity. Evidently, the K+ pump is sited on the goblet cell apical membrane and K+ follows a nonmixing pathway via only part of the goblet cell cytoplasm. The cavity appears to be elec. isolated in alimentary tissues, as it is in sensory sensilla, thereby allowing a p.d. >180 mV (lumen pos.) to develop across the apical plasma membrane. This p.d. appears to couple K+ pump energy to nutrient absorption and pH regulation. .