TAILIEUCHUNG - Báo cáo lâm nghiệp: "Seasonal development of female strobilus of stone pine (Pinus pinea L.)"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: Seasonal development of female strobilus of stone pine (Pinus pinea L.). | 51s Ann. Sci. For. 1989 46 suppl. 51s-53s Forest Tree Physiology E. Dreyer et al. eds. Elsevier INRA Seasonal development of female strobilus of stone pine Pinus pinea L. B. Abellanas and . Pardos Laboratory of Plant Anatomy Physiology and Genetics . Ingenleros de Montes Ciudad Universitaria 28040 Madrid Spain Introduction The stone pine Pinus pinea L. prevails as a fruit tree rather than as a timber tree. Therefore maximizing cone crops must be a primary goal for breeding performance Pardos and Abellanas 1988 . Establishment by grafting of clone banks from selected provenances is a valid way to progress Magini 1965 . Precise knowledge of the 4 yr reproductive cycle of this species is necessary for an accurate evaluation of cone production and manipulation of the selected clones in the banks. The object of the research described herein was to examine the morphology of the female strobilus and to describe the phenology of the reproductive cycle from seed-cone bud initiation to appearance of the embryo. Materials and Methods Female strobili and potentially reproductive buds were collected from randomly selected p. pinea L. grafts growing in a clone bank located at Castelidn Spain. Buds and strobili were taken monthly from July 1987 to July 1988 fixed in FAA formalin-acetic acid-ethanol and stored in 70 ethanol until dissection. Then the samples were dehydrated and embedded in paraffin. Serial microtome sections were cut 7-9 pm thick stained with safranin and fast-green and examined under a light microscope. Results In April just after flowering occurred the development of the new long-shoot bud begins. The apical meristem enlarges and initiates primary cataphylls and the first axillary primordia. In July the axillary primordia begin to form secondary cataphylls but they do not reach the differentiation stage into either vegetative or reproductive structures until December. During December and January the secondary long-shoot buds differentiate . seed-cone

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