Effects of Calcium, Indoleacetic Acid & Distance From Stem Apex on Potassium & Rubidium Absorption by Excised Segments of Etiolated Pea Epicotyl.
نویسندگان
چکیده
The enhancing effect of Ca on K uptake by excised roots has been known for some time (25) and has been referred to as the Viets effect; however, whether or not such an enhancement occurs in stem tissue has not been established. Indoleacetic acid (IAA) may enhance Rb uptake by stem segments (11) and this effect in Jerusalem artichoke tuber tissue has been attributed to an increase in capacity of the tissue for cation exchange (8) rather than accumulation. The fact that each, Ca and IAA, may enhance cation absorption suggests that both may play some important role in cellular ion exchange or ion transport. One obvious possibility is that they separately or together may be involved in the formation, or activity, of an ion carrier; however, other explanations are possible (7) and the present study was done in an attempt to ascertain whether or not Ca would enhance K accumulation by pea stem segments and if so, what the effect of auxin is on this system.
منابع مشابه
Red light and auxin effects on rubidium uptake by oat coleoptile and pea epicotyl segments.
Apical segments of etiolated oat (Avena sativa L. cv. Victory) coleoptiles showed enhanced uptake of [(86)Rb(+)] when tested 30 minutes after a 5-minute red irradiation. The response was partly reversible by far red light. Uptake was sensitive to carbonyl cyanide m-chlorophenyl hydrazone, but not to isotonic mannitol. Indoleacetic acid (10(-7) molar) caused a very pronounced and rapid stimulati...
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It has previously been shown that indoleacetic acid (IAA) applied to pea roots is in part clegraded and in part conjugated witlh aspartic acid to form indoleacetylaspartic acicl (IAAspA) (2, 6). WVhile other workers (9) have reported that IAA applied to pea roots is metabolically bound to tissue protein to give a Salkowski reactive derivative, w\e have found no evidlence of such a complex. almo...
متن کاملInfluence of Ethylene on Indole-3-acetic Acid Concentration in Etiolated Pea Epicotyl Tissue.
Indole-3-acetic acid levels are diminished about 50% in 5- to 6-day-old epicotyls of etiolated pea (Pisum sativum L.) seedlings treated with 10 to 36mul/l ethylene for 18 to 24 hr.
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Measurements were made over a 4-day period of the effect of added indoleacetic acid (IAA), puromycin, actinomycin D and 5-fluorodeoxyuridine (FUdR) on growth and the levels of total DNA, RNA, protein and cellulase in segments of tissue at the apex of decapitated etiolated epicotyls of Pisum sativum, L. var. Alaska.The hormone induced swelling of parenchyma cells and cell division. By 3 days aft...
متن کاملEffects of Filipin and Cholesterol on K Movement in Etiolated Stem Cells of Pisum sativum L.
Filipin, a polyene antibiotic known to induce leakage of materials from various cells, depresses K(+) and NO(3) (-) uptake in etiolated pea epicotyl segments. Filipin concentrations which strongly reduce K(+) influx have little effect on efflux; however, high concentrations enhance K(+) efflux. Filipin has no effect on respiration rates or cell electropotentials; its action is presumed to be on...
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عنوان ژورنال:
- Plant physiology
دوره 37 2 شماره
صفحات -
تاریخ انتشار 1962