Abstract
Abstract 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. Key words: Kineticsmaximum uptake rate VmaxMichaelis constant Kmheterosision interactions
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Claims 7
Claim · model-written summary
Maximum uptake capacity showed positive heterosis for both ions, stronger for manganese.
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Vmax values for both Mn2+ and Cu2+ showed that an appreciable heterotic effect occurred, higher for Mn2+ than for Cu2+”
t0“maize genotypes”
e1“the hybrid displayed with respect to the inbreds higher Km values for Mn2+”
Claim · model-written summary
The hybrid had higher Mn2+ Km than the inbreds.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the hybrid displayed with respect to the inbreds higher Km values for Mn2+”
t0“maize genotypes”
Claim · model-written summary
The hybrid had slightly lower Cu2+ Km than the inbreds.
- Material
- hybride0
- Outcome
- Km values for Cu2+e0
- Direction
- lowere0
- Qualifier
- only slightlye0
- Comparator
- inbredse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the hybrid displayed with respect to the inbreds higher Km values for Mn2+ and only slightly lower Km values for Cu2+”
t0“maize genotypes”
Claim · model-written summary
Maximum absorption capacity showed positive heterosis but substrate affinity did not.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“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”
t0“maize genotypes”
Claim · model-written summary
Cu2+ inhibited Mn2+ uptake noncompetitively, reducing Vmax while Km stayed constant.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cu2+ inhibited uptake of Mn2+ in a non‐competitive fashion (Vmax for Mn2+ fell in the presence of Cu2+ while Km remained constant)”
t0“maize genotypes”
Claim · model-written summary
Cu2+ inhibited manganese uptake less in the hybrid than in its parents.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“this effect appeared to a lesser extent in the hybrid than in its parentals”
t0“maize genotypes”
Claim · model-written summary
Mn2+ had no relevant effect on Cu2+ uptake.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no relevant effects of Mn2+ on the uptake of Cu2+ could be evidenced”
t0“maize genotypes”
The same questions in other papers
copper(2+) · nutrient: content · Zea mays (maize)Results agree
2 papers in the same direction as this paper
- no effect
- negative
manganese(2+) · nutrient: content · Zea mays (maize)Results agree
2 papers in the same direction as this paper
- negative
- no effect
Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.