Análisis del crecimiento de cinco híbridos de zanahoria (<i>Daucus carota</i> L.) mediante la metodología del análisis funcional

Abstract

Plant growth analysis of five hybridsof carrot (Daucus carota L.) by functionalanalysis methodology. Plant growth analysisof 5 hybrids of carrot (Daucus carota L.) wasconducted in Cipreses, Oreamuno, Cartago, withthe aim to describe the phenology and growth ofcarrot. Growth analysis was performed using themethodology of functional analysis. The leaf areaand the dry weight of each organ and total plantwere evaluated, non-linear regression modelswere adjusted for these variables, the parametersthat define the mathematical functions that bestdescribe the growth were obtained and each modelwas plotted for each variable evaluated. The rootsand total dry weight variables were adjusted to anasymptotic nonlinear logistic function: PS=alpha/(1+exp (-beta (x-gamma))); the leaves dry weightand the leaf area were adjusted into the bell-type function: PS=alpha*exp (-beta (x-gamma)2).Plants showed a sigmoidal growth curve withwell-defined stages: a slow growth phase, thenan exponential growth segment, followed by aperiod of reduced growth and finally a stageof stability. The plant spends its early stages of development establishing the photosyntheticmachinery, indirect competition with radicaldevelopment. The root begins to thicken between63-77 dap, during the second phase of growth,with a greater proportion of assimilates allocatedto the root, leading to an increase in its diameter.Finally, from the analysis of the variables oftotal dry weight and leaf area, 2 groups can beestablished: on the one side Supreme, Esperanzaand Bangor, and on the other CLX-3193 andSirkana. The first group showed the highestvalues for such variables.