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Movement and distribution of 14C-indole-3-acetic acid in branches and rooted cuttings of Douglas-fir (1982)

Starbuck, C. J. ; Roberts, A. N.

Oxford, UK : Blackwell Publishing Ltd

Physiologia plantarum 55 (1982), S. 0

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ISSN: 1399-3054

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Biology

Notes: The transport of 14C-indole-3-acetic acid in branch terminals and stems of rooted cuttings of Pseudotsuga menziesii (Mirb.) Franco was studied to determine if the plagiotropic growth of cuttings might result from an accumulation of basipetally transported auxin in the morphologically upper side of cuttings stems. Twenty-four h after application of 10 μl of 14C-IAA solution to the cut surface of decapitated, rooted cuttings, nearly twice as much activity was detected in extracts of tissue from the morphologically upper than from the lower halves of the stems. A similar distribution of activity was observed in horizontal branch terminals and in branch terminals which had been tied vertically for 2 weeks. The magnitude of the difference in activity between the 2 sides of the stem was greater in the horizontal than in the vertical branches.There was no significant difference in transport through the upper and lower sides of excised stem segments from cuttings or branch terminals. In segments from rooted cutting stems, however, significantly more radioactivity from 14C-IAA donor blocks was detected in the lower than in the upper halves of segments.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1399-3054.1982.tb00310.x

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Intensity of Bud Dormancy in Douglas-fir and Its Relation to Scale Removal and Rooting Ability (1974)

ROBERTS, A. N. ; TOMASOVIC, B. J. ; FUCHIGAMI, L. H.

Oxford, UK : Blackwell Publishing Ltd

Physiologia plantarum 31 (1974), S. 0

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ISSN: 1399-3054

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Biology

Notes: Uniform 1- or 2-year-old rooted cuttings of 3 Douglas-fir, Pseudotsuga menziesii (Mirb.) Franco, clones were grown under natural conditions in containers from July 1, 1971 to February 15, 1972. At 2-week intervals, plants from this natural temperature and daylength environment were moved into controlled, long day (LD-18 h) and short day (SD-9 h) environments to measure the intensity of bud dormancy from its inception to termination based on number of days to bud break and percentage of expanding buds on a given date. Growth responses to bud scale removal were also helpful in describing the degree and nature of bud dormancy. The cessation of initiatory activity at the bud apex, reflected in the needle number of the subsequent growth flush, corresponded to a September peak of bud dormancy based on the number of days to bud break in the LD environment. Similarly, the cold requirement for breaking bud dormancy was measurable in the SD environment. The use of such rest intensity indices is illustrated in the close relationship established between bud dormancy development and stem cutting rooting ability.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1399-3054.1974.tb03693.x

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Seasonal Changes in Auxin Effect on Rooting of Douglas-Fir Stem Cuttings as Related to Bud Activity (1973)

ROBERTS, A. N. ; FUCHIGAMI, L. H.

Oxford, UK : Blackwell Publishing Ltd

Physiologia plantarum 28 (1973), S. 0

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ISSN: 1399-3054

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Biology

Notes: The relation of seasonal bud activity to the periodicity of rooting in Douglas-fir, Pseudotsuga menziesii (Mirb.) Franco, stem cuttings was studied in combination with auxin and cold storage treatments. Cuttings were collected in all months except April and May, for 3 years.Rooting was least in September and October when bud dormancy was most pronounced, greatest in December and January if exogenous auxin was applied, or in February and March if no auxin was used. The buds contributed significantly to rooting from January to April, and were responsible for differences in rooting of terminal and lateral cuttings during this period. Auxin did not enhance rooting in September and October, but at other times it replaced or supplemented the role of vegetative buds in promoting rooting. Auxin also removed the differences in rooting between lateral and terminal cuttings. Cold treatment in October and November removed bud dormancy and enhanced rooting. After November the need for auxin or cold treatment diminished and rooting without either treatment reached a maximum in February and March. Auxin did not change the seasonal pattern of rooting but broadened and enhanced the rooting response in favor of earliness.These results are discussed in relation to the effect of bud activity on auxin response and root initiation. The hypotheses are proposed that cambial dormancy or auxin deficiency is not the limiting factor during bud dormancy, and that cold treatments have the effect of bringing inhibitors and promoters into proper balance for optimum rooting response.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1399-3054.1973.tb01178.x

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4

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Compression wood in rooted cuttings of Douglas-fir (1983)

Starbuck, C. J. ; Roberts, A. N.

Oxford, UK : Blackwell Publishing Ltd

Physiologia plantarum 57 (1983), S. 0

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ISSN: 1399-3054

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Biology

Notes: Rooted cuttings of three clones of Douglas-fir [Pseudotsuga menziesii (Mirb.) Franco] were growing plagiotropically two seasons after propagation. The oblique growth habit of cuttings was due, in part, to dorsoconvex curvature of the wood of the original 12-cm cuttings after rooting. In cross sections taken 1.5–2.0 cm from the bases of cutting stems, the total widths of xylem and compression wood were significantly greater on the morphologically upper (convex) than on the lower sides of the stems. This was due to an asymmetry in the growth ring produced the season following rooting. In nearly every cross section examined, 80–90% of the width of the upper side of this growth ring was compression wood. Examination of cross sections taken 1.5–2.0 cm from the distal ends of the wood of original cuttings revealed a shift in the position of compression wood formation during the second season. As the distal portions of their stems were displaced from the vertical by curvature, cuttings of two clones produced compression wood on their lower sides in this region. Cuttings from the third clone, which showed the least basal curvature, continued forming compression wood on their upper sides in the distal portions of the original cuttings.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1399-3054.1983.tb02303.x

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