|
| << vorige | volgende >> |
Tijdschrift beschrijving
Alle jaargangen van het bijbehorende tijdschrift
Alle afleveringen van het bijbehorende jaargang
Alle artikelen van de bijbehorende aflevering
Details van artikel 3 van 7 gevonden artikelen
| Titel: |
Efficiency of manganese and copper uptake by excised roots of maize genotypes |
| Auteur: |
Landi, S. Fagioli, F. |
| Verschenen in: |
Journal of plant nutrition |
| Paginering: | Jaargang 6 (1983) nr. 11 pagina's 957-970 |
| Jaar: |
1983-11 |
| Inhoud: |
In this study three maize (Zea mays L.) genotypes, a single-cross hybrid and its parents were evaluated for their efficiency to absorb Mn2+ and Cu2+. All experiments were run using excised roots and uptake efficiency was expressed as Vmax and Km. Also, the genotypes were investigated for possible mutual effects between Mn2+ and Cu2+ during their absorption by roots. Vmax values for both Mn2+ and Cu2+ showed that an appreciable heterotic effect occurred, higher for Mn2+ than for Cu2+ At the same time the hybrid displayed with respect to the inbreds higher Km values for Mn2+ and only slightly lower Km values for Cu2+. Hence a clear positive level of heterosis was evidenced with reference to the maximum absorption capacity (Vmax) but not to the affinity (1/Km) for substrates. Cu2+ inhibited uptake of Mn2+ in a non-competitive fashion (Vmax for Mn2+ fell in the presence of Cu2+ while Km remained constant) and this effect appeared to a lesser extent in the hybrid than in its parentals. At the same time no relevant effects of Mn2+ on the uptake of Cu2+ could be evidenced. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 3 van 7 gevonden artikelen
| << vorige | volgende >> |