Vol. 85 No: 1

Title:
Bench-grafting of Persian walnut as affected by pre- and post-grafting heating and chilling treatments

Authors:
B. DEHGHAN, K. VAHDATI, D. HASSANI and R. REZAEE

pp: 48-52

Abstract:
Walnut grafting is more difficult than in most other fruit trees, and increasing the success of grafting, as well as lowering the cost of grafting, is important for commercial nurseries. Two trials were conducted to find the most efficient procedure for walnut grafting. Each trial was repeated twice during 2006 and 2007. In the first trial, the effects of three bench-grafting methods (i.e., side-stub, omega, and whip-and-tongue) were evaluated on the grafting success of four scion cultivars (‘Z₅₃’, ‘Hartley’, ‘Pedro’, and ‘Serr’). Omega grafting gave the highest callus rating (scoring 2.6 out of 4.0), the greatest number of callused plants (82%), the most graft-take (71%), and the highest graft survival rate (81%). In the second trial, the effects of pre-grafting, warm forcing treatments, and chilling of callused plants were studied using the side-stub grafting method and two scion cultivars (‘Hartley’ and ‘Pedro’). Warm forcing (26º – 28ºC at 80 – 90% RH) of the scion and rootstock material (for 3 d and 14 d, respectively) along with chilling (2º – 4ºC at 80 – 90% RH for 30 d) of callused plants both showed the highest rates of graft-take (78%) and graft survival (84.6%). The lowest level of graft-take (30%) and graft survival (41.6%) occurred in untreated control plants. Our study provides an alternative method for propagating walnut cultivars under partially controlled growth conditions.

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