Genetics of slash pine /

Dorman, Keith W.

doi:10.5962/bhl.title.87841

Cited by 10 publications

(7 citation statements)

References 4 publications

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“…The sex ratios between juvenile and mature scions were different in both years (P < 0.001 year 1, P < 0.02 year 2). (9), and although juvenile scions of this species also grow more and produce more branches per unit stem length, at first they flower significantly less than mature scions (12). However, after a number of years, grafts from juvenile scions flower more than those from more mature scions of loblolly pine (26).…”

Section: Effect Of Age On Scion Developmentmentioning

confidence: 99%

Maturation in Larch

Greenwood¹,

Hopper²,

Hutchison³

1989

Plant Physiol.

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The time course of maturation in eastern larch (Larix laricina [Du Roil K. Koch) was examined by grafting scions from trees of different ages onto 2-year-old root stock and following scion development for several years. Height, diameter, foliar chlorophyll content, and rooting ability of scion-derived cuttings all varied linearly as a function of log10 age. Chlorophyll content (milligrams per gram of dry weight) increased while height, diameter, and ability to root decreased with age (P < 0.01). The tendency toward orthotropic growth and branch formation per centimeter of main stem decreased abruptly between age 1 and 5 years (P < 0.01). Total chlorophyll content of both long and short shoot foliage increased by 30 to 50% with increasing age, but the chlorophyll a/b ratio did not change. Also, juvenile long shoot needles were significantly longer than mature (P < 0.01). Surprisingly, the juvenile scions produced more total strobili over two successive years, but the mature scions produced a significantly higher proportion of male strobili (P < 0.001 year 1; P < 0.02 year 2). The age-related changes in foliar traits were not associated with changes in DNA methylation between juvenile and mature scions. Using HPLC, we found that 20% of foliar DNA cytosine residues were methylated in both scion types.

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Section: Effect Of Age On Scion Developmentmentioning

confidence: 99%

Maturation in Larch

Greenwood¹,

Hopper²,

Hutchison³

1989

Plant Physiol.

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“…All treatments were balanced by age 1184 1 Received for publication 26 November 1979;revision accepted II May 1981. I would like to thank Mike Slee for his critical review of an earlier version of this manuscript. LOBLOLL Y PINE breeding programs are slowed because the adult, reproductive phase of this important timber species does not begin until it is 10 to 15 years old (Dorman and Zobel, 1973). In addition, mature scion wood grafted onto 1 to 2-yr-old rootstock produce almost no male strobili and very few female strobili until about four years after grafting in the field (Greenwood and Schmidtling, 1981).…”

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confidence: 99%

Reproductive Development in Loblolly Pine. Ii. The Effect of Age, Gibberellin Plus Water Stress and Out‐of‐phase Dormancy on Long Shoot Growth Behavior

Greenwood

1981

American J of Botany

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The effects of age from seed, out‐of‐phase dormancy, and gibberellin treatment with water stress on the reproductive and vegetative development of the long shoot terminal bud were observed. Scions of different ages were grafted onto 1‐yr‐old rootstocks, and the younger scions grew more and produced fewer strobili than older ones. Out‐of‐phase dormancy promoted both male and female flowering at all ages, but the older scions responded better. Gibberellin4/7 plus water stress promoted development of female strobili only. Treatments that promote flowering also increase the size of the resting bud. It is proposed that treatment effects promoting flowering appear to fall into two categories: 1) Those which promote the formation of a resting bud, and 2) those which affect the subsequent development of resting buds which have the potential to develop strobili.

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“…Scion material, however, was obtained from 8-to 10-year-old trees in progeny tests. These ramets were only just approaching sexual maturity (Dorman and Zobel 1973), and none ofthe chosen ramets had yet begun to flower. The potted grafts were grown outdoors at Hot Springs, Arkansas in 57-liter plywood boxes containing a 6:2:1 (v/v) mixture of sand, hardwood bark and Redi-earth (a potting medium manufactured by W. R. Grace and Co., Cambridge, Mass.…”

Section: Experimental Materials and Analysismentioning

confidence: 99%

Promotion of Flowering in the Pinaceae by Gibberellins

Ross

Greenwood

1979

Physiologia Plantarum

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GibberelUns (GAs) were effective in promoting flowering in sexually mature (45-year-old scions) grafts of loblolly pine (Pinus taeda L.). Seed-cone production was increased 12-fold in fieldgrown, grafted ramets by bi-weekly, May-September applications of 500 ^g per branch of GA^,,. Gibberellin A3 was equally effective at 500 fig but not at 100 fig per branch, while GA5 was ineffective at either concentration. A second study using potted, less-sexually mature (8-to 10-year-old scions) grafts gave a reduced level of seed cones in response to GAs. However, even on these younger grafts GA4/7 was a significant promotive treatment, GA3 being considerably less effective. Branch girdling, tested as an adjunct treatment, was ineffective. It is now apparent that exogenous applications of GA4/7 are effective on a number of Pinaceae species, and their use to promote earlier and more abundant flowering in breeding orchards of grafted ramets for at least two species, loblolly pine and Douglas fir [Pseudotsuga menziesii (Mirb.) Franco] is practical.

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Genetics of slash pine /

Cited by 10 publications

References 4 publications

Maturation in Larch

Maturation in Larch

Reproductive Development in Loblolly Pine. Ii. The Effect of Age, Gibberellin Plus Water Stress and Out‐of‐phase Dormancy on Long Shoot Growth Behavior

Promotion of Flowering in the Pinaceae by Gibberellins

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