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Papaya (Carica papaya L.) is an important fruit crop in many tropical and subtropical countries; it is commercially propagated through seeds, which lead to production of non true-to-type plants. Grafting for mass multiplication of the selected variety is therefore necessary. The objective of this study was to determine the influence of rootstock age and grafting season on the success of cleft grafting and growth of grafted plants under greenhouse conditions. The trial was conducted using an experimental randomized complete block design with 4A × 2B factorial scheme, four blocks, and 15 grafted plants per experimental unit. Factor A represented four rootstock ages (1, 2, 3, and 6 mo) and factor B represented two grafting seasons (summer and autumn). Results showed that rootstock age and grafting season had a significant effect on all the parameters: sprouting time, percentage of graft success, scion sprout length, and number of new leaves per graft. The youngest rootstock age (1 mo) achieved the best results for all the parameters. The best season for grafting was summer. The treatment combination of 1-mo-old rootstocks in summer produced minimum sprouting time (8.40 d), the highest percentage of graft success (93.33%), and graft growth in the greenhouse. Therefore, 1-mo-old rootstocks and grafting in summer or autumn should be used to propagate papaya by cleft grafting.

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in vitro regeneration system was developed for the hermaphrodite papaya 'Red Lady' using Murashige and Skoog (MS) medium supplemented with and 1.0 mgL-1) or kinetin (10 mgL-1) in combination with-1). Media consisted of 0.5 or 1.0 mgL-1 BAP in combination with 0.1 mgL-1 NAA were determined to be the most effective based on the percentage of explants that produced shoots (93.33 and respectively). Shoot multiplication and elongation was achieved 30 days after transferring the initiated shoots to full-strength MS supplemented with 0.5 mgL-1-1 200-400 mgL-1 casein hydrolysate (CH). Effect of full and haft-strength MS medium supplemented with different indole-3-butyric acid (IBA) concentrations (0.0-4.0 mgL-1) was tested for rooting. Adventitious rooting occurred after subculturing excised shoots on a medium containing 2.0 or 2.5 mgL-1 IBA and 300 mgL-1 potting medium consisting of peat moss: perlite (1:1). After 40 This protocol can be used for commercial production of 'Red Lady' papaya plantlets. MS medium.