Traits of the sugar cane associated with tons of cane per hectare and sucrose (% cane)

摘要

In the initial stages of clonal selection, indirect selection for variables tons of sugar cane per hectare (TCH) and sucrose (% cane) is used, based on some agronomic traits associated with TCH and sucrose (% cane). This indirect selection can increase efficiency to the extent that better knowledge about the nature and magnitude of the associations among the characteristics of interest required and, between the latter and productivity indicators. The aim was to estimate genetic correlations between agronomic traits (causal factors) and performance variables (response variables), also decompose its magnitude by path analysis. Five characters of interest, cane length, diameter, stalk population per meter, TCH and sucrose (% cane) were evaluated in five locations in the geographic area of the semi-dry valley of the Cauca River to 17 varieties and two witnesses (CC 85-92 and MZC 74-275) on plant-cane using Latice experimental design. To estimate the genetic correlation coefficients and path coefficients (path coefficient) the GENES software was used. The analysis showed that for high TCH varieties and sucrose (% cane) must first be selected clones carried high above the control range 85-92 CC (334 cm) to ensure a high sucrose content, and then you can make a second screening by thick stems of larger diameter than the control (32 mm) and high stalk population equal to or higher than the control (14 stems/m).