Graft studies on Cashew Genotypes

English

Graft union in cashew (Anarcadium occidentale L.) was studied using light microscopy. Callus formation was most abundant from regions of the pith and cortex which had been damaged during preparation of the scion and rootstock for grafting. Of particular interest was the observation that the callus cells formed from the pith developed in regular rows resembling vascular cambium or phellogen, rather than in the random manner observed in other species which others have reported. Cambial union was established between 20 and 30 days after grafting by differentiation of callus formed mainly by dedifferentiation of cortical cells. Unlike other species which have been described, no significant amounts of callus were observed to be produced from ray parenchyma of the secondary xylem. The new periderm was established between the surfaces of the gran partners after the cambial union had sealed off the wound edges.

Asante, A. K.; Barnett, J. R.; Caligari, P. D.