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Abstract

Grafting breadfruit (Artocarpus altilis) on chataigne (Artocarpus camansi) rootstock has the potential to be used as a commercial propagation method to increase the supply of breadfruit within the Caribbean and the environmental distribution of breadfruit trees. However, variable success in grafting these two species has been reported and the impact of important factors on successful grafting has not been elucidated. This study aimed to evaluate the effect of the plant growth regulators Indole butyric acid (IBA) and 6-benzylaminopurine (BAP) - and the cultivar of the scion on the breadfruit-chataigne graft union. Scion was taken from three breadfruit cultivars 'Yellow' and 'White' from Trinidad and Tobago, and 'JA1', a Jamaican accession, and from chataigne, the control. IBA treatments (100 ppm and 200 ppm) and BAP treatment (200 ppm) negatively affected (P < 0.05) length of survival of the newly grafted plants compared with the control (0 ppm). Grafted plants with 'White' and chataigne scion cultivars generally survived longer (P < 0.05) than grafts with other cultivars. Therefore, genetic differences among the breadfruit scions clearly influenced successful grafting of breadfruit on chataigne rootstock. The basis of these differences and the effects of PGRs on the grafting these species require further investigation.

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