Selenium absorption by two-grooved milkvetch and western wheatgrass from selenomethionine, selenocystine, and selenite

Williams, M. Coburn and Mayland, H.F. (1992) Selenium absorption by two-grooved milkvetch and western wheatgrass from selenomethionine, selenocystine, and selenite. Journal of Range Management. 45:374-378.

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Abstract

Selenium (Se) occurs in various forms in soils, including inorganic
selenite and selenate and organic selenomethionine. Plant
uptake of the inorganic, but not the organic forms, has been
studied extensively. Organic-Se uptake was therefore examined in
two-grooved milkvetch (Astragalus bisulcatus (Hook.) Gray), a
Se-accumulating forb, and western wheatgrass (Pascopyrum smithii
(Rydb.) Löve), a non-Se accumulating grass. Plants were
grown for 56 days in nutrient culture enriched with 1 or 2 mg Se
liter-1 as sodium selenite or 0.3 or 0.6 mg Se liter-1 as Se-DL-methionine
or Se-DL-cystine. Growth was not affected by the Se
treatments. Selenium concentrations in shoots were proportional
to nutrient-solution concentrations for both species grown in
sodium selenite and selenocystine, and for wheatgrass when grown
in selenomethionine. Selenium concentrations in milkvetch were
not increased by the higher concentration of selenomethionine.
Shoots of milkvetch, growing in the low-Se treatment contained
243, 283, and 47 µg Se g-1 , for the sodium selenite, selenomethionine,
and selenocystine treatments, respectively, whereas values for
the wheatgrass were 20, 32, and 17. Shoot:root Se concentrations
were 1.2, 0.7, and 0.4 in milkvetch and 0.1, 0.5, and 0.1 in wheatgrass
for the sodium selenite, selenomethionine, and selenocystine,
respectively. Selenium is more readily transported to shoots in the
accumulator plant, or conversely; there is a barrier to Se movement
to shoots in the nonaccumulator plant. Wheatgrass contained
sufficient Se to be of concern in animal toxicosis and because of
greater dry matter yield accumulated as much or more Se than did
the milkvetch.

Item Type:	Article
NWISRL Publication Number:	0770
Subjects:	Irrigated crops > Grass forage > Chemistry Mass Import - autoclassified (may be erroneous)
Depositing User:	Dan Stieneke
Date Deposited:	20 Nov 2010 21:53
Last Modified:	01 Dec 2016 22:52
Item ID:	575
URI:	https://eprints.nwisrl.ars.usda.gov/id/eprint/575