A quantitative requirement for long day in the induction of staminate strobili by gibberellin in the conifer <i>Cupressus arizonica</i>

Pharis, R. P.; Ruddat, Manfred D. E.; Glenn, James L.; Morf, W.

doi:10.1139/b70-090

Cited by 15 publications

(3 citation statements)

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“…The relative investment in male and female reproductive structures by A. pinsapo individuals directly affects the male to female strobilus ratio and therefore sex expression. In some conifers the sex ratio of a given genotype can be affected by environmental conditions, or by hormone applications (Pharis et al, 1970 ;Freeman et al, 1981 ;McArthur and Freeman, 1982 ;Freeman and Vitale, 1985). In others conifers, gender variation extends to individuals that produce only female cones, expecially in young trees (Smith, 1981 ;Lloyd and Bawa, 1984).…”

Section: Discussionmentioning

confidence: 99%

Gender Expression inAbies pinsapoBoiss., a Mediterranean Fir

Arista

1997

Annals of Botany

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Gender expression was recorded for three geographically distinct populations and two stand densities of pinsapo fir (Abies pinsapo) in southern Spain, during 4 consecutive years (1990-1993). During this period the trees only flowered in 1991 and 1992, and thus only two cone crops could be quantified. No significant geographical variation in flowering intensity or in cone crop production was found. The most extreme variations were correlated with stand density : flowering intensity and cone crop were always greater in low density trees. Abies pinsapo is a monoecious species but all the populations studied showed a predominance of female plants, with a few male and monoecious individuals, thus indicating a functionally subdioecious breeding system. No differences in gender expression between populations were recorded. Differences in sex expression of individuals at two different stand densities were found, but these were only significant in 1991. In dense stands of pinsapo firs branches were limited to the top of trees and thus, they produced mainly female cones, whereas isolated trees had branches from ground level and as a consequence they were predominantly male, with a higher total reproductive effort. The results indicate that relative investment in male and female reproductive structures by A. pinsapo individuals is a response to plant architecture, plant resource status and environmental variation.

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Section: Discussionmentioning

confidence: 99%

Gender Expression inAbies pinsapoBoiss., a Mediterranean Fir

Arista

1997

Annals of Botany

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“…Conversely, the role of photoperiod in reproduction, bud set, and dormancy in species from two of the five conifer families has been documented (e.g. Pharis et al . 1970; Dormling 1993), and the role of phytochromes in mediating dormancy has been established in three species of spruce (Young & Hanover 1977; D’Aoust & Hubac 1986; Clapham et al .…”

Section: Phytochrome‐mediated Development In Green Plantsmentioning

confidence: 99%

Phytochrome‐mediated development in land plants: red light sensing evolves to meet the challenges of changing light environments

2006

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“…The two key factors that have made this possible are that western redcedar responds to exogenous GA 3 at a very early age, and selfs easily. The pioneering works by Pharis and colleagues (e.g., Pharis and Morf 1968;Pharis et al 1969Pharis et al , 1970 allowed us to apply and refine their results to the current breeding technique, especially with respect to the timing of GA 3 application with photoperiod. Secondly, as mentioned earlier, western redcedar readily selfs with no evidence of early life cycle inbreeding depression.…”

Section: Discussionmentioning

confidence: 99%

Preliminary results from five generations of a western redcedar (Thuja plicata) selection study with self-mating

Russell¹,

Ferguson²

2008

Tree Genetics & Genomes

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A western redcedar selection study with selfmating was initiated using an accelerated breeding cycle, such that five generations were completed in 10 years. Thirty random and 30 selected lines for height, from 15 unrelated full-sib families (S 0 ; inbreeding coefficient F=0) were the founders for the subsequent selfed lines (S 1 to S 4 ; F=0.5 to 0.9375, respectively). Of the original 60 lines, 50 were still in existence at the S 4 generation. Random extinct lines and replacement seedlings resulted either from a lack of mature cones or filled seed, whereas selected line extinctions and replacements were mostly due to a lack of filled seed. Approximately 47% of parent-trees in the S 4 generation displayed temporal separation of male and female function, as opposed to 7% in the S 0 . Observed response to selection in height was approximately 21% after four generations. There were no significant reductions in seed weight or vigor across generations, and these traits were not correlated with selection height. Results are discussed in relation to the general influences of inbreeding and random genetic drift on response to the selection and incorporation of selfing into tree-breeding strategies.

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A quantitative requirement for long day in the induction of staminate strobili by gibberellin in the conifer Cupressus arizonica

Cited by 15 publications

References 0 publications

Gender Expression inAbies pinsapoBoiss., a Mediterranean Fir

Gender Expression inAbies pinsapoBoiss., a Mediterranean Fir

Phytochrome‐mediated development in land plants: red light sensing evolves to meet the challenges of changing light environments

Preliminary results from five generations of a western redcedar (Thuja plicata) selection study with self-mating

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