PJB-2016-189
GENETIC VARIABILITY, CORRELATION STUDIES AND PATH COEFFICIENT ANALYSIS IN GLADIOLUS ALATUS CULTIVARS
AASIA RAMZAN1*, NAUSHERWAN NOBEL NAWAB1, ABDUL AHAD2, ISHFAQ AHMED HAFIZ2, MUHAMMAD SUDHEER TARIQ1 AND SAMIA IKRAM
Abstract
A study was undertaken to find out the estimates of genetic variability, genetic parameters and character association among different flower traits between three gladiolus cultivars viz: Sancerre, Fado and Advanced Red. The experiment was repeated three times by using RCBD (Randomized complete block design) at Department of Horticulture, PMAS-UAAR, Rawalpindi. The highest genotypic coefficient variation (GCV) and phenotypic coefficient variation (PCV) magnitude was observed for spike length (16.00) and number of florets per spike (14.84) followed by number of leaves (10.00). Among the traits studied the highest heritability estimates was recorded in spike length (99.5%) followed by number of florets/spike (99.6%) and lowest in plant height (98.2%). The genetic advance as percent of mean was ranged from 2.8% to 24.75%. Genetic advance was highest for floret breadth (24.75%) and lowest for plant height (2.8%). High heritability combined with high genetic advance was noticed for number of florets per spike, spike length and floret breadth indicating additive gene action which suggested that improvement of these traits would be effective for further selection of superior genotypes. Plant height and number of florets per spike showed highly positive and significant association with spike length, number of leaves, leaf area, floret length and floret breadth while, spike length registered positive and significant correlation with number of leaves and floret breadth. The path coefficient analysis based on spike length, as responsible variable exposed that all of the traits exerted direct positive effect except leaf area and floret length. Spike length imparted maximum positive direct effect on the number of florets per spike. Hence, spike length and number of florets per spike may be considered for further improvement. However, Floret length and floret breadth may also be considered as a criterion for selection.
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