Studies on the vegetative propagation of cashew (Anacardium occidentale L.)
1983
Mukred, A.W.O.
Experiments in budding, grafting and stem cuttings showed that these methods can be used under Trinidad conditions, but success percentage is low. A delay in callus formation on the scions and cuttings was attributed to drying out of scions and latex exudation from laticiferous canals and early leaf abscission in stem cuttings. Intermittent mist improved root initiation of stem cuttings by delaying leaf abscission. Air layering is considered the most satisfactory method of cashew propagation but there is a low percentage survival of the marcots after severing from the mother tree. Histological studies of root initiation in air layers showed the importance of callus formation. Root initiation took place de novo using the double-ringing technique. A larger callus area resulted in increased root formation. Application of auxins and prolonging period of attachment of air layers did not affect root initiation. IBA at 300 ppm when applied after callus formation and location of marcots in the sun improved root initiation. Photosynthesis, C fixation and translocation of assimilates as measured by radioactive C indicated that leaves are the main sites of assimilate storage and translocation and the limiting factors in callus formation
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