Tracheid Differentiation in Southern Pines During the Dormant Season
Keywords:Southern pine, wood formation, tracheid differentiation, dormant season
AbstractThe differentiation of last-formed xylem tracheids of loblolly (Pinus taeda) and slash (P. elliottii) pines was followed during the overwinter dormant period in the upper Piedmont of South Carolina. Tissue samples taken from the outer portion of the stem of a poletimber-sized tree of each species in November and March were examined microscopically and tracheid transverse cell-wall thickness was measured. Cell double-wall thickness was compared between the two dormant season samples and with that of the previous year's cells of the same radial file. The comparison of cell-wall thickness indicated that the last-formed latewood cells of the annual ring continued to deposit cell-wall material through March and quite possibly into the following spring.
Bailey, I. W. 1923. The cambium and its derivative tissues. IV. The increase in girth of the cambium. Am. J. Bot.10:499-509.nBalatinecz, J., and R. Kennedy. 1968. Mechanism of earlywood-latewood differentiation in Larix decidua.Tappi51(9):414-422.nBannan, M. W. 1968. Anticlinal divisions and the organization of the conifer cambium. Bot. Gaz.129:107-113.nBassett, J. 1966. Seasonal diameter growth of loblolly pines. J. Forest.64:674-676.nBrown, C. L. 1970. Physiology of wood formation in conifers. Wood Sci.3(1):8-22.nFreeze, F. 1967. Elementary statistical methods for foresters. Agric. Handbook 317, U.S. Dept. of Agric, U.S. Forest Service. Pp. 27-28.nLarson, P. 1969. Wood formation and the concept of wood quality. Yale Sch. For. Bull. #74.nMurmanis, L. 1971. Structural changes in the vascular cambium of Pinus strobus L. during an annual cycle. Ann. Bot.35:133-141.nMurmanis, L., and I. B. Sachs. 1969. Seasonal development of secondary xylem in Pinus strobus L. Wood Sci. Tech.3:177-193.nNewman, I. V. 1956. Pattern in meristems of vascular plants. I. Cell partition in living apices and in the cambial zone in relation to the concepts of initial cells and apical cells. Phytomorphology6:1-19.nSanio, K. 1873. Anatomie der gemeinen Kiefer (Pinus sylvestris L.) Jahrb. Wiss. Bot.9:50-126.1nWhitmore, F. W., and R. Zahner. 1966. Development of the xylem ring in stems of young red pine trees. Forest Sci.12(2):198-210.n
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