Articles
CHIP BUDDING OF ‘AU-SUPER’ CHINESE CHESTNUT SCIONS ON AU-CROPPER AND QING SEEDLING ROOTSTOCKS
Article number
844_15
Pages
115 – 118
Language
English
Abstract
A study was conducted to determine the optimal time of chip budding AU-Super on Qing and AU-Cropper seedling rootstocks.
Twenty trees of each scion/rootstock combination were budded on 21 July, 15 Aug., and 1 and 19 Sept., 2006. Diameters of the rootstock liners were measured at the time of budding.
Scion bud diameters were recorded on 23 Mar. 2007 before growth was visible and unions were evaluated on 25 Apr. 2007. Budding success increased from 15% on 21 July to 65 and 75% for Qing and AU-Cropper rootstocks, respectively, on 19 Sept.
Mean scion bud diameters of trees that formed successful unions and produced scion bud growth in the spring were generally greater than those of trees that did not produce scion bud growth in the spring.
For AU-Cropper, mean scion bud diameters of successful grafts were ≥4.1 mm, while those of Qing were >3.6 mm.
At the first two budding dates, tissue growth around the budding tape was excessive and sometimes covered the scion bud.
At all budding dates, 75 to 100% of the budded trees produced callus around the bud plate in the fall, but in the spring, scion buds often failed to grow on trees with good callus formation.
Mean rootstock diameter generally increased at successive budding dates.
However, rootstock diameter did not appear to influence percent bud take.
Twenty trees of each scion/rootstock combination were budded on 21 July, 15 Aug., and 1 and 19 Sept., 2006. Diameters of the rootstock liners were measured at the time of budding.
Scion bud diameters were recorded on 23 Mar. 2007 before growth was visible and unions were evaluated on 25 Apr. 2007. Budding success increased from 15% on 21 July to 65 and 75% for Qing and AU-Cropper rootstocks, respectively, on 19 Sept.
Mean scion bud diameters of trees that formed successful unions and produced scion bud growth in the spring were generally greater than those of trees that did not produce scion bud growth in the spring.
For AU-Cropper, mean scion bud diameters of successful grafts were ≥4.1 mm, while those of Qing were >3.6 mm.
At the first two budding dates, tissue growth around the budding tape was excessive and sometimes covered the scion bud.
At all budding dates, 75 to 100% of the budded trees produced callus around the bud plate in the fall, but in the spring, scion buds often failed to grow on trees with good callus formation.
Mean rootstock diameter generally increased at successive budding dates.
However, rootstock diameter did not appear to influence percent bud take.
Publication
Authors
M.R. Warmund, M.V. Coggeshall
Keywords
Castanea mollissima, callus, graft union , incompatibility, propagation
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