Growth trends and geographic variation in a Quercus alba progeny test

Schlarbaum, SE

doi:10.1051/forest:19930750

Cited by 6 publications

(6 citation statements)

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“…Our analyses indicate that selecting one tree per stand using rigorous phenotypic selection was no more effective in providing initial improvements in growth and stem quality of Q. rubra than selecting a number of good phenotypes in a stand. These results are similar to those obtained for Q. alba (Schlarbaum 1993). Similar results and recommendations have also been obtained for other species (e.g.…”

Section: Discussionsupporting

confidence: 91%

Proceedings, 10th Central Hardwood Forest Conference

Gottschalk¹,

Fosbroke²

1995

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Section: Discussionsupporting

confidence: 91%

Proceedings, 10th Central Hardwood Forest Conference

Gottschalk¹,

Fosbroke²

1995

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“…The plant material used in this study was derived from individuals that were at adult vegetative stage but were not yet reproductive trees. Notwithstanding, the fastest growing families of Q. alba can be identified at a relatively early (6-9 years) age (Schlarbaum 1993). The identification of a highly responsive genotype could enable production of a suitable material for use in molecular studies on initiation of SE in explants other than zygotic embryos of woody species.…”

Section: Discussionmentioning

confidence: 99%

Induction of somatic embryogenesis from different explants of shoot cultures derived from young Quercus alba trees

Corredoira

San-José

Viéitez

2011

Trees

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The induction of somatic embryogenesis from shoot apices and leaf explants of shoot cultures derived from 6-to 7-year-old white oak (Quercus alba L.) trees is reported in this study. Embryogenic response was obtained in two out of the three genotypes evaluated with embryo induction frequencies up to 50.7% for WOQ-1 and 3.4% for WOQ-5 genotypes. The embryogenic explants formed translucent nodular structures and cotyledonary-stage somatic embryos, which developed from callus tissue, indicating an indirect embryogenesis process. An efficient procedure was developed for WOQ-1 material on the basis of the most appropriate leaf developmental stage. Growing leaves excised from two nodes below the shoot apex showed the highest embryogenic induction index. These leaves contain cells in an undifferentiated state, as shown by the presence of precursor cells of stomata, absence of intercellular spaces and low starch content in the mesophyll cells. Nodular structures and/or somatic embryos began to arise 7-8 weeks after culture initiation, although most emerged after 9-12 weeks in culture. The sequence of application of media for somatic embryo induction was optimized with a two-step procedure consisting of culturing the explants in medium supplemented with 21.48 lM NAA and 2.22 lM BA for 8 weeks and transfer of explants into plant growth regulator-free medium for another 12 weeks. Clonal embryogenic lines were established and maintained by secondary embryogenesis. Embryo germination (30%) and plantlet conversion (16.6%) were achieved after cold storage for 2 months.

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“…Finally, that the plant material employed in the present study derived from relatively juvenile source plants (6-7 years old) may seem to throw doubt on whether the results of the study are of use for genetic improvement purposes. However, correlations between the values of growth parameters such as height or diameter at different ages indicate that, at least in the case of Q. alba, selection of the fastest growing families can be identified at a relatively early (6-9 years) age (Schlarbaum 1993).…”

Section: Discussionmentioning

confidence: 99%

In vitro regeneration of the important North American oak species Quercus alba, Quercus bicolor and Quercus rubra

Viéitez

Corredoira

Ballester

et al. 2009

Plant Cell Tiss Organ Cult

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North American oak species, with their characteristic strong episodic seasonal shoot growth, are highly problematic for clonal micropropagation, resulting in the inability to achieve a stabilized shoot multiplication stage. The potential for initiating and proliferating shoot cultures derived from Quercus alba, Q. bicolor and Q. rubra explants was investigated, and a micropropagation method for these species was developed. Branch segments from 6 to 7-year-old trees were forced-flushed and the forced shoots were used as source of explants for culture initiation. A consistent shoot multiplication stage was achieved, in 13 of the 15 genotypes established in vitro, although marked differences occurred in explants from different genotypes/species. The control of efficient shoot multiplication involved the culture of decapitated shoots in a stressful horizontal position on cytokinin-containing medium with a sequence of transfers within a 6-week subculture cycle, which was beneficial to overcoming the episodic character of shoot growth. During each subculture cycle, the horizontally placed explants were cultured on media containing 0.2 mg l -1 benzyladenine (BA) for 2 weeks with two successive transfers (2 weeks each) to fresh medium with 0.1 mg l -1 BA, giving a 6-week subculture cycle. The general appearance and vigor of Q. alba and Q. bicolor shoot cultures were improved by the inclusion of both 0.1 mg l -1 BA and 0.5 mg l -1 zeatin in the medium used for the second transfer within the 6-week subculture cycle. Addition of AgNO 3 (3 mg l -1 ) to the shoot proliferation medium of Q. rubra had a significant positive effect on shoot development pattern by reducing deleterious symptoms, including shoot tip necrosis and early senescence of leaves. The three species showed acceptable in vitro rooting rates by culturing microcuttings in medium containing 25 mg l -1 indolebutyric acid for 48 h with subsequent transfer to auxin-free medium supplemented with 0.4% activated charcoal. Although an initial 5-day dark period generally improved the rooting response, it was detrimental to the quality of regenerated plantlets. However, activated charcoal stimulated not only the rooting frequencies, but it also enhanced plant quality, as evidenced by root, shoot and leaf growth.

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Growth trends and geographic variation in a Quercus alba progeny test

Cited by 6 publications

References 0 publications

Proceedings, 10th Central Hardwood Forest Conference

Proceedings, 10th Central Hardwood Forest Conference

Induction of somatic embryogenesis from different explants of shoot cultures derived from young Quercus alba trees

In vitro regeneration of the important North American oak species Quercus alba, Quercus bicolor and Quercus rubra

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