tailieunhanh - Báo cáo khoa học: "Dormancy and spring burst of lateral low-pruned mulberry (Morus alba L.)"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài:"Dormancy and spring burst of lateral low-pruned mulberry (Morus alba L.). | 233s Ann. Sci. For. 1989 46 suppl. 233s-235s Forest Tree Physiology E. Dreyer et al. eds. Elsevier INRA Dormancy and spring burst of lateral buds on stems of low-pruned mulberry Mows alba L. T. Suzuki1 M. Kitano2 and K. Kohno2 1 Faculty of Textile Science Kyoto Kogei-Sen-i University Matsugasaki Kyoto 606 and 2 Faculty Farmstead Kyoto Kogei-Sen-i University Saga Kyoto 616 Japan Introduction After decapitation lateral shoot growth of mulberry coppice Morus alba L. from low-pruned stumps has an extremely acrotonic form in which only a few upper buds grow out to form branches Suzuki ef al. 1988 . In contrast the majority of the buds of 1 yr old stems including the basal buds burst into growth almost simultaneously and elongate in the spring Suzuki and Kohno 1987 . Bud dormancy and the release of lateral buds from dormancy are related in some way to the stem and to the location of these buds on the stem and greatly affect the pattern of bud development in the new growth of trees in the spring Meng Horn et al. 1975 Crabbe 1981 1984a b . Although many experiments with exogenous and or endogenous growth inhibitors and growth promoters have been conducted on the control of bud dormancy as well as bud development less attention has been devoted to lateral buds located along the stem in dormancy research. This study was undertaken to define the role of lateral bud dormancy on spring burst and shoot growth in the low-pruned mulberry. Materials and Methods Rooted hardwood cuttings of Morus alba L. cv. Shin-ichinose were grown in a light clay soil at the Saga Experimental Farm of Kyoto Kogei-Sen-i University Kyoto Japan. The cuttings were produced in the spring of 1977 and pruned annually from 1979 to 1986 to maintain stump heights at 40-50 cm in early March . The dominant coppice shoots were allowed to grow from 1986 through 1987 and used for the experiments Fig. 1 . Twenty shoots about 210 cm long were collected at 2-5 wk intervals from 25 August to 16 March Fig. 2 After .