zunia.vn

Tuyển sinh 2024 dành cho Gen-Z

zunia.vn

» Luận Văn - Báo Cáo

» Báo cáo khoa học

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

Chia sẻ: Nguyễn Minh Thắng | Ngày: | Loại File: PDF | Số trang:3

Báo xấu

44
lượt xem 1
download

Download Vui lòng tải xuống để xem tài liệu đầy đủ

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.)...

Chủ đề:

Bình luận(0) Đăng nhập để gửi bình luận!

Lưu

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

stems of buds Dormancy and spring burst of lateral on low-pruned mulberry (Morus alba L.) 2 K. Kohno T. Suzuki M. Kitano 2 1 and Faculty of Textile Science, Kyoto Kogei-Sen-i University, Matsugasaki, Kyoto 606, 2 Farmstead, Kyoto Kogei-Sen-i University, Saga, Kyoto 6i6, Japan Faculty in the burst and shoot low-pruned growth Introduction mulberry. decapitation, lateral shoot growth of After mulberry coppice (Morus alba L.) from low-pruned stumps has an extremely Materials and Methods acrotonic form, in which only a few upper buds grow out to form branches (Suzuki Rooted hardwood cuttings of Morus alba L. cv. et al., 1988). In contrast, the majority of Shin-ichinose were grown in a light clay soil at the buds of 1 yr old stems, including the the Saga Experimental Farm of Kyoto Kogei- basal buds, burst into growth almost Sen-i University, Kyoto, Japan. The cuttings were produced in the spring of 1977 and simultaneously and elongate in the spring pruned annually from 1979 to 1986 to maintain (Suzuki and Kohno, 1987). stump heights at 40-50 cm (in early March). The dominant coppice shoots were allowed to Bud dormancy and the release of lateral grow from 1986 through 1987 and used for the buds from dormancy are related in some experiments (Fig. 1). way to the stem and to the location of Twenty shoots (about 210 cm long) were col- these buds on the stem, and greatly affect lected at 2-5 wk intervals from 25 August to 16 the pattern of bud development in the new March (Fig. 2). After harvesting and, when growth of trees in the spring (Meng Horn necessary, defoliation, these stems were di- vided into 5 regions and the segments (length al., 1975; Crabbe, 1981, 1984a, b). et about 15 cm) to be tested were collected from Although many experiments with exo- the upper portion of each region of the stems, genous and/or endogenous growth in- respectively (Fig. 1About 10 cm of the stem hibitors and growth promoters have been apices were excluded from the experiments conducted on the control of bud dormancy because the majority of the uppermost buds usually could not grow out into shoots (Suzuki as well as bud development, less attention and Kohno, 1987). Unless otherwise stated, 5 has been devoted to lateral buds located groups of 20 segments each were then incubat- along the stem in dormancy research. ed in water to a depth of ca 1.5 cm at 27°C in This study was undertaken to define the the dark, and the subsequent bud break of the segments was recorded. Buds were considered role of lateral bud dormancy on spring
dormancy of the upper buds reached its peak. The gradient then weakened and changed towards a linear one, but not an acrotonic one, with the disappearance of the dormant condition in February and March. Discussion and Conclusion In trees, lateral buds on the previous are released from correla- year’s growth tive inhibition by a period of winter dor- mancy. This release may certainly be related to dormancy gradient changes be- tween buds along the stem, which induce an acrotonic gradient in the new growth of trees in the spring (Meng Horn et al., 1975; Crabbe, 1981, 1984a, b). In low- pruned mulberry, however, the gradient changes toward a linear one, with a disap- pearance of the dormant condition in ’sprouting’ when the bud scales had separated February and March (Fig. 2). As a result, and the tips of developing leaves were visible. bud burst and shoot growth in low-pruned The incubating water was changed every other day during the incubation period. mulberry occur readily from the majority of buds, including the basal buds, in the spring. Results Acknowledgments When studied by a multiple-node-cutting test (Fig. 2), the buds of the upper seg- ment I experienced their maximum depth We thank Mr. H. Fujiwara of the Saga Experi- mental Farm, Kyoto Kogei-Sen-i University, of dormancy around November and Kyoto, Japan, for maintenance of the cultivated December. In contrast, buds of the lower mulberry trees. segments were less dormant than those of the upper segment until February, and there was 100% breaking of the buds of segment V throughout. In August and References September, unlike the extremely acrotonic growth habit of the decapitated shoots Crabbé J.J. (1981) The influence of bud dor- (Suzuki et al., 1988), the stems showed a mancy in the morphogenesis of trees and clear basitonic gradient in bud growth shrubs. Acta Hor;tic. 120, 167-172 potential, in which the lower buds grew out Crabbé J.J. (1E384a) Morphogenetical ways faster than the upper ones. This basitonic towards vigor restriction in spontaneous and gradient persisted until November, when
de préséances entre bourgeons, sur le man-made dwarf trees. Acta Hortic. 146, 113- rameau 120 de l’année du Rhamnus frangula L. Physiol. Véq. 13, 335-348 Crabbé J.J. (1984b) Correlative effects modi- fying the course of bud dormancy in woody Suzuki T., Kitano M. & Kohno K. (1988) Lateral plants. Z. Pflanzenphysiol. 113, 465-469 bud outgrowth on decapitated shoots of low- pruned mulberry (Morus alba L.). Tree Physiol. Meng Horn C., Champagnat P., Barnola P. & 4, 53-60 (1975) L’axe caulinaire, facteur Lavarenne S.

CÓ THỂ BẠN MUỐN DOWNLOAD

LV.01: Bộ Luận Văn Thạc Sĩ Quản Trị Kinh Doanh MBA

165 tài liệu

2076 lượt tải

THÔNG TIN

TRỢ GIÚP

HỖ TRỢ KHÁCH HÀNG

Theo dõi chúng tôi

Chịu trách nhiệm nội dung:

Nguyễn Công Hà - Giám đốc Công ty TNHH TÀI LIỆU TRỰC TUYẾN VI NA

LIÊN HỆ

Địa chỉ: P402, 54A Nơ Trang Long, Phường 14, Q.Bình Thạnh, TP.HCM

Hotline: 093 303 0098

Email: support@tailieu.vn

Giấy phép Mạng Xã Hội số: 670/GP-BTTTT cấp ngày 30/11/2015 Copyright © 2022-2032 TaiLieu.VN. All rights reserved.