LINKAGE MAP CONSTRUCTION AND QTL ANALYSIS OF FRUIT TRAITS IN MELON (CUCUMIS MELO L.) BASED ON CAPS MARKERS

摘要

A study was undertaken to find out the estimates of genetic variability, genetic parameters and character associationamong different flower traits between three gladiolus cultivars viz: Sancerre, Fado and Advanced Red. The experiment wasrepeated 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 wasobserved for spike length (16.00) and number of florets per spike (14.84) followed by number of leaves (10.00). Among thetraits 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 withhigh genetic advance was noticed for number of florets per spike, spike length and floret breadth indicating additive geneaction which suggested that improvement of these traits would be effective for further selection of superior genotypes. Plantheight and number of florets per spike showed highly positive and significant association with spike length, number ofleaves, leaf area, floret length and floret breadth while, spike length registered positive and significant correlation withnumber of leaves and floret breadth. The path coefficient analysis based on spike length, as responsible variable exposedthat all of the traits exerted direct positive effect except leaf area and floret length. Spike length imparted maximum positivedirect effect on the number of florets per spike. Hence, spike length and number of florets per spike may be considered forfurther improvement. However, Floret length and floret breadth may also be considered as a criterion for selection.