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Genetic variation of sulfate translocation in maize

Authors: SACCOMANI, MASSIMO; CACCO, GIOVANNI; M. Motto;

Genetic variation of sulfate translocation in maize

Abstract

The ability of a crop species to absorb and translocate a large amount of nutrients is a primary plant property which affects the efficiency of utilization of available inorganic resources. The objective of this investigation was to examine genotypic differences for the kinetic parameters, Vmax and Km, of sulfate translocation from roots to leaves, in a diallel series of maize single crosses, involving five inbred lines. The results showed that large differences exist among the 20 F1 hybrids tested for both kinetic parameters of sulfate translocation. Moreover, it was revealed that both additive and non-additive genetic effects control the expression of the various characters examined. However, only non-additive genetic effects were found to be of importance for the Km parameters. In addition, significant variations due to reciprocal effects were found for both Vmax and Km parameters. A reasonably unfavourable correlation was also detected between Vmax and Km. However, it appears that maize genotypes could be developed that would be more efficient in utilizing the available inorganic resources from soil solution. Abstract (Italian) La capacita di una pianta di assorbire e traslocare una rilevante quota di elementi nutritivi influenza l'efficienza di utilizzazione delle risorse inorganiche disponibili nel terreno. Il presente lavoro prevede una analisi delle differenze genotipiche relative all'abilita di traslocazione dei solfati dal sistema radicale all'apparato fogliare, espressa tramite i parametri Km e Vmax, in una serie di ibridi F1 derivata da una rete di incroci diallelici tra 5 linee pure di mais. I risultati ottenuti mostrano sostanziali differenze, tra i 20 ibridi analizzati, per la capacita di traslocazione dei solfati, sia per la Vmax sia per la Km. E' stato, inoltre, osservato che nel controllo genetico della traslocazione dei solfati, espressa dai parametri Km e Vmax intervengono effetti genetici additivi e non additivi. Tuttavia, solo per il parametri Km gli effetti genetici non additivi sono risultati importanti. Per entrambi i parametri Vmax e Km e stata anche accertata la presenza di significativa variabilita ascrivibile ad effetti reciproci. E' stata, infine, osservata la presenza di una sensibile correlazione tra Vmax e Km. Sembra, tuttavia, possibile la sintesi di genotipi di mais piu efficienti nella utilizzazione di sostanze minerali presenti nel terreno.

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Italy
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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
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