Tomato Graft Union Failure Is Associated with Alterations in Tissue Development and the Onset of Cell Wall Defense Responses

Grafting is a technique applied to considerable number of crops, with tomato standing out. However, this limited by the obtaining unfunctional grafts, which decrease success rate and therefore benefits achieved. The aim work was analyze failure in intraspecific grafting plants, focusing on tissue development, cell wall defense reactions, distribution starch soluble sugars at graft junction. autografts higher than that homografts heterografts. Unfunctional heterografts showed similar responses: absence vascular reconnections lack adhesion between scion rootstock, even though callus clusters differentiation new vasculature were produced. scions grafts accumulated more rootstocks, showing strong asymmetry response. In addition, three types deposits observed walls grafts: lignin, suberin, callose, combined accumulation one them being frequent, particularly lignin suberin. These apparently prevent seem be major cause failure.