Formulation of selection criteria for chosing elite clones in early clonal generation of Saccharum complex hybrid.

摘要

Criteria for the formulation of selection indices and for the selection of elite sugarcane clones in early clonal generation were determined using 84 clones, including 3 controls (BO110, BO128 and BO130), grown in Bihar, India, during the spring season of 2004-05. High range of variation and high coefficient of variability were observed for the majority of the quantitative traits evaluated (germination percent at 45 days, number of shoots per hectare at 120 days, number of millable canes per hectare, cane height at harvest, cane diameter at harvest, single cane weight, refractometric brix in mid-November, refractometric brix in mid-December, refractometrix brix in mid-January, sucrose percent in juice in January, commercial cane sugar percent in juice in January and cane yield). The number of shoots at 120 days, number of millable canes during harvesting, and single cane weight were positively correlated with cane yield. The number of millable canes during harvesting, single cane weight, brix in mid-November, and sucrose percent in juice in January were the major positive direct yield-contributing characters. Two multiple regression equations were developed, i.e. one was based only on the number of millable canes during harvesting, single cane weight, and brix in mid-November, and another that was based on the 11 yield-contributing traits. The efficiency of the multiple regression equations were almost the same. CoX02217 and CoX02177 were superior in terms of yield per se..