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Registro Completo |
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Biblioteca(s): |
Embrapa Trigo. |
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Data corrente: |
10/01/2010 |
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Data da última atualização: |
29/08/2011 |
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Autoria: |
NORVELL, W. A.; WELCH, R. M. |
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Título: |
Growth and nutrient uptake by barley (Hordeum vulgare L. cv. Herta): Studies using on N- (2-Hydroxylthyl) ethylenedinitrilotriacetic acid-buffered nutrient solution technique. I. Zinc ion requirements. |
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Ano de publicação: |
1993 |
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Fonte/Imprenta: |
Plant Physiology, v. 101, n. 2, p. 619-625. 1993. |
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Idioma: |
Inglês |
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Conteúdo: |
The critical range of Zn2+ activity in nutrient solution required for optimum growth of barley (Hordeum vulgare L. cv Herta) was studied using the synthetic chelating agent N-(2-hydroxyethyl)ethylenedinitrilotriacetic acid to buffer micronutrient metal ions. The activity of Zn2+ was varied over a wide range from approximately 0.1 x 10–)11 to 22 x 10–)11 M Zn2+. The dry weight of barley shoots reached a maximum at Zn2+ activities above approximately 3 x 10–)11 M and was clearly depressed when Zn2+ activities were below about 1 x 10–)11 M. The relationship in shoots between dry weight and Zn concentrations supports the view that there is a critical Zn concentration of about 25 [mu]g g-1 dry weight in whole shoots of barley seedlings. When Zn2+ activities in solution were near or below approximately 3 x 10–)11 M, barley shoots accumulated higher concentrations of P, Mn, Ca, Mg, and Na, whereas Cu concentrations were reduced. P and Mn began to accumulate in the shoots before differences in dry weights were apparent and provided the earliest index of Zn deficiency. In Zn-deficient roots, concentrations of Ca and Mg increased by 25 to 30%, and those of Fe and Mn more than doubled. Zn appears to play a special role in regulating uptake of several mineral nutrients in barley. |
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Thesagro: |
Cevada; Crescimento; Nutriente. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01879naa a2200169 a 4500
001 1839368
005 2011-08-29
008 1993 bl --- 0-- u #d
100 1 $aNORVELL, W. A.
245 $aGrowth and nutrient uptake by barley (Hordeum vulgare L. cv. Herta)$bStudies using on N- (2-Hydroxylthyl) ethylenedinitrilotriacetic acid-buffered nutrient solution technique. I. Zinc ion requirements.
260 $c1993
520 $aThe critical range of Zn2+ activity in nutrient solution required for optimum growth of barley (Hordeum vulgare L. cv Herta) was studied using the synthetic chelating agent N-(2-hydroxyethyl)ethylenedinitrilotriacetic acid to buffer micronutrient metal ions. The activity of Zn2+ was varied over a wide range from approximately 0.1 x 10–)11 to 22 x 10–)11 M Zn2+. The dry weight of barley shoots reached a maximum at Zn2+ activities above approximately 3 x 10–)11 M and was clearly depressed when Zn2+ activities were below about 1 x 10–)11 M. The relationship in shoots between dry weight and Zn concentrations supports the view that there is a critical Zn concentration of about 25 [mu]g g-1 dry weight in whole shoots of barley seedlings. When Zn2+ activities in solution were near or below approximately 3 x 10–)11 M, barley shoots accumulated higher concentrations of P, Mn, Ca, Mg, and Na, whereas Cu concentrations were reduced. P and Mn began to accumulate in the shoots before differences in dry weights were apparent and provided the earliest index of Zn deficiency. In Zn-deficient roots, concentrations of Ca and Mg increased by 25 to 30%, and those of Fe and Mn more than doubled. Zn appears to play a special role in regulating uptake of several mineral nutrients in barley.
650 $aCevada
650 $aCrescimento
650 $aNutriente
700 1 $aWELCH, R. M.
773 $tPlant Physiology$gv. 101, n. 2, p. 619-625. 1993.
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