Combining Ability for Crispy Flesh in Green Consumption Papaya

Abstract

Combining ability is important information for development of papaya (Carica papaya) hybrids. The objective of this study was to investigate general combining ability (GCA) of five papaya inbred lines and specific combining ability (SCA) of the hybrids for fresh weight, crispy flesh, disease level, fruit length, fruit width and yield. The inbred lines were crossed in full diallel matting design with reciprocals, and 2 0 F1 hybrids were evaluated in a randomized complete block design with five replications: ten trees/replication, in the winter season 2018 at the Center for Research and Development of Papaya for Unripe Consumption in Maha Sarakham. The genetical analysis were using Griffing’method 4 with fixed model effect. The results were no significant in all treatments except crispy% ring spot disease and yields. General combining ability (GCA) and specific combining ability (SCA) were significant (99%) for percentage of papaya ring spot disease and were significant (95%) in crispy and yields. For 4 cultivars (Yellow Krang, Red Krang, Khaeg Nuan Kalasin,Kaek Dam) expressed high GCA. Three hybrids were : 1) Red Krang × Khaeg Nuan Kalasin for fresh weight and fruit width 2) Yellow Krang × Khaeg Nuan Kalasin for disease level, fruit length and high yield and 3) Yellow Krang × Red Krang for crispy papaya hybrids had high SCA. Thus, these three crosses were the fix cultivars suitable for double cross productions.