INVESTIGADORES
PRATTA Guillermo Raul
congresos y reuniones científicas
Título:
Phenotypic characterization of photosynthetic capacity and growth in contrasting sorghum genotypes
Autor/es:
ROSAS, BELÉN; GUILLERMO R. PRATTA; GUIAMET, J.J.; ORTIZ, DIEGO
Lugar:
Encuentro virtual
Reunión:
Simposio; 9th Annual R.F. Baker Plant Breeding Symposium; 2022
Institución organizadora:
Department of Agronomy at Iowa State University
Resumen:
Sorghum (Sorghum biolor L. Moench) is a staple crop utilized for food, feed and bioenergy. The reported variability in sorghum transpiration efficiency and photosynthetic traits can be used to obtain cultivars with higher water use efficiency. The objective of this work was to characterize morpho-physiological variables of agronomic interest in sorghum genotypes contrasting in photosynthetic capacity and growth characteristics. Ten sorghum genotypes previously selected for photosynthetic traits were planted in a field in a randomized complete block design with three replications. Data was analyzed through ANOVA and degree of genetic determination (DGD) and Pearson's correlation coefficient were estimated. The following variables were evaluated: height (h), leaf chlorophyll content (SPAD), specific leaf area (SLA), adaxial and abaxial stomatal density (Ad_SD, Ab_SD), stomatal number (SN) and size (SS), carbon assimilation rate (A), stomatal conductance (gs), transpiration rate (T), intrinsic water use efficiency (WUEi), energy capture efficiency by reaction centers of open PSIIs (Fv´/Fm´), effective quantum yield (ΦPSII) and photochemical extinction (qP). Low to high GDG values were detected, ranging 0.03 to 0.68. Most variables were significantly correlated with at least one other variable. The highest positive correlations were detected between stomatal characters (SS, SN, Ad_SD and Ab_SD), A and gs (r=0.96), A and T (r=0.97) and between gs and T (r=0.98) . The highest negative correlations were between gs and WUEi (r=-0.90), T and WUEi (r=-0.86) and between SS and specific leaf area (SLA) (r=-0.83). Based on our results it proposed that morpho-physiological traits can be used for selection for higher photosynthetic rate and water use efficiency in sorghum.
