“Lateral Control”: Phytohormone Relations in the Conifer Treetop and the Short- and Long-Term Effects of Bud Excision in Abies nordmanniana

Rasmussen, Henrik; Veierskov, Bjarke; Hansen-Møller, Jens; Nørbæk, Rikke

doi:10.1007/s00344-009-9132-5

Cited by 9 publications

(11 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Cutting or girdling the apical meristem is a damage that alters the hormonal balance, resulting in the blockage of auxin basipetal transport (WAN et al, 2006), along with increasing concentrations of cytokinin translocated by the roots, resulting in the initiation of dormant buds below the affected area (RASMUSSEN et al, 2010), as found in this research (Figure 2 E).…”

Section: Resultssupporting

confidence: 61%

CLONAL FORESTRY OF Piptocarpha angustifolia: SURVIVAL AND GROWTH VIGOR IN FIELD CONDITIONS

Stuepp

Wendling

Koehler

et al. 2017

CERNE

View full text Add to dashboard Cite

Piptocarpha angustifolia is a potential native species for Brazilian forestry. However, a lot of challenges and technical constraints persist, hindering its expansion as a species for forest plantations, among them, the lack of evaluation of their survival and growth in field conditions. Thus, we evaluated the survival and growth vigor of Piptocarpha angustifolia according to two initial heights of mini-cuttings at planting. Plants from mini-cuttings with 20 ± 5 cm and 40 ± 5 cm were planted in field using 3 × 2 m spacing. In these, we evaluated the survival, base diameter and total height during 24 months. The experiment was implemented in a completely randomized design in a split plot model. Plants of 20 ± 5 cm are superior in survival to 40 ± 5 cm ones. The growth in height and diameter remained constant up to 24 months, reaching 64.1 cm and 13.5 mm, independently of the plants expedition time. In general, the establishment of clonal plantation of Piptocarpha angustifolia was limited by the attack of pests, mainly cutting ants. For this reason, plantation of this species must take into account the possibility of greater pest control. SILVICULTURA CLONAL DE Piptocarpha angustifolia: SOBREVIVËNCIA E VIGOR DE CRESCIMENTO A CAMPORESUMO: Piptocarpha angustifolia (vassourão-branco) é uma espécie nativa potencial para a silvicultura brasileira. No entanto, uma série de desafios e limitações técnicas ainda persistem, dificultando sua expansão como espécie para plantios florestais, dentre eles, a falta de avaliação de sua sobrevivência e crescimento em condições de plantio a campo. Assim, o presente estudo objetivou avaliar a sobrevivência e o vigor de crescimento em condições de pleno sol a campo de mudas clonais de Piptocarpha angustifolia em função da altura inicial das mudas, no momento do plantio. Mudas provenientes de miniestaquia com 20 ± 5 cm e 40 ± 5 cm de altura foram plantadas a campo em espaçamento 3 × 2 m. Nestas, foram avaliadas a sobrevivência, o diâmetro da base e a altura total ao longo de 24 meses. O experimento foi conduzido num delineamento inteiramente casualizado, em parcelas subdivididas no tempo. Mudas de 20 ± 5 cm mostraram-se superiores em sobrevivência às de 40 ± 5 cm. O crescimento em altura e diâmetro manteve-se constante até os 24 meses, alcançando 64,1 cm e 13,5 mm, independente da altura de expedição das mudas. De modo geral, o estabelecimento de plantios clonais de Piptocarpha angustifolia foi limitado pelo ataque de pragas, principalmente formigas cortadeiras. Por essa razão, a recomendação de plantios desta espécie precisa levar em conta a possibilidade de um maior controle de pragas.

show abstract

Section: Resultssupporting

confidence: 61%

CLONAL FORESTRY OF Piptocarpha angustifolia: SURVIVAL AND GROWTH VIGOR IN FIELD CONDITIONS

Stuepp

Wendling

Koehler

et al. 2017

CERNE

View full text Add to dashboard Cite

show abstract

“…2). The auxin needed for stem unit elongation most likely originates from the developing needles, as the level of auxin in the terminal bud is below detection limit during the period where the top leader elongates (Rasmussen et al 2010). The alteration in the auxin/cytokinin ratio we have determined between the bud and stem (Veierskov 2018, Table 1) is most likely the cause of the variation in the rate of cell division and maturation that resulted in the observed changed Fibonacci number.…”

Section: Discussionmentioning

confidence: 89%

“…2). This longer growth period is probably sustained by a high level of cytokinins present in the SAM in the last part of the top leader elongation period (Rasmussen et al 2010). Furthermore, it is during this period of growth that the Fibonacci number is halved from about 14 to 7 in the upper 2 sample points (Table 2).…”

Section: Discussionmentioning

confidence: 97%

See 1 more Smart Citation

Characterization of Top Leader Elongation in Nordmann Fir (Abies nordmanniana)

Martens

Sørensen²,

Burow

et al. 2019

J Plant Growth Regul

Self Cite

View full text Add to dashboard Cite

Our understanding of the developmental changes that occur during top leader elongation in gymnosperms lags behind that in angiosperms. We developed a semiquantitative method for determining epidermal cell size, by measuring the Feret diameter after cell wall staining of stem epidermal peels. This method allowed a large number of cells to be measured at various locations in the top leader of the Christmas tree Abies nordmanniana. Further, we have identified the growth rate of individual sections of the top leader, and the relationship between cell length and needle arrangement throughout the top leader. At bud break, all stem units begin to elongate simultaneously, but growth ceases from the base upwards during top leader elongation. Long top leaders were characterized by having up to three times as long cells at the base compared to short top leaders, whereas the cell lengths were similar in the apical region independent of the given plant growth capacity. In the basal sector, the level of auxin was much higher, whereas the levels of cytokinins were lower than in the apical sector, causing the auxin/cytokinin ratio to change from about 3 in the apical sector to more than 20 in the basal part. The Fibonacci number changed in the apical sector due to an increased cell number in the stem units and therefore longer distance between the needles. We conclude that the general growth pattern during top leader elongation in A. nordmanniana is similar to angiosperms but differs at the cellular level.

show abstract

“…The growth activation of dormant buds have their regulation by genetic and hormonal signals (MEIER et al, 2012), as attested in association with an imbalance between auxins and cytokinins. Then, the photosynthetic production beneath the affected area is a consequence of blockade auxin conduction (WAN et al, 2006), jointly with the increase of cytokinin concentrations transmitted by the root, leading to germination of dormant buds (RASMUSSEN et al, 2010).…”

Section: Epicormic Shoots Inductionmentioning

confidence: 99%

EPICORMIC SHOOTS INDUCTION AND ROOTING CUTTINGS OF Calophyllum brasiliense

Kratz

Wendling

Stuepp

et al. 2016

CERNE

View full text Add to dashboard Cite

ABSTRAT:Calophyllum brasiliense is present in a wide natural distribution range in Brazil and its monopodial growth, with a rectilinear stem and a moderately dense timber has attracted the attention from the logging industry in recent decades. In the meantime, the lack of efficient rescue and vegetative propagation methods of adult plants has been a narrowing condition for the selection of superior genotypes in breeding programs of the species. Therefore, we evaluate epicormic shoots induction methods and the rooting cuttings of 14 year-old Calophyllum brasiliense trees. From this scope, three methods of epicormic shoots induction were evaluated: coppicing, girdling and partial girdling. We evaluate the number of produced sprouts and the percentage of sprouted trees at 06, 12 and 15 months' after the experiment installation. Results have indicated the feasibility of Calophyllum brasiliense vegetative rescue by cuttings method using epicormic shoots induced by coppicing and girdling. In contrast, partial girdling was not effective in epicormic shoots emission. Concerning adventitious roots, the sprouting technique had no influence in the rooting of cuttings, showing variation among the different stock plants. INDUÇÃO DE BROTAÇÕES EPICÓRMICAS E ESTAQUIA DE Calophyllum brasiliense RESUMO:Calophyllum brasiliense apresenta ampla distribuição natural no Brasil e seu crescimento monopodial, fuste retilíneo e madeira moderadamente densa tem atraído o interesse da indústria madeireira nas últimas décadas. Entretanto, a carência em métodos eficientes de resgate e propagação vegetativa de material adulto tem sido um fator limitante na seleção de genótipos superiores em programas de melhoramento da espécie. Assim, objetivou-se avaliar métodos de indução de brotações epicórmicas e o enraizamento de estacas em árvores de Calophyllum brasiliense com 14 anos de idade. Para tanto, três métodos de indução de brotações epicórmicas foram implantados: decepa, anelamento e semianelamento. Avaliou-se o número de brotos produzidos e a porcentagem de matrizes brotadas aos 6, 12 e 15 meses após a instalação do experimento. Com as brotações resultantes, foram instalados três experimentos de estaquia, comparando o enraizamento adventício entre as diferentes matrizes e métodos de indução de brotações epicórmicas. Os resultados demonstraram a viabilidade do resgate vegetativo de Calophyllum brasiliense por estaquia utilizando brotações epicórmicas induzidas por decepa e anelamento do tronco. Em contrapartida, o semianelamento não foi eficiente na indução de brotações epicórmicas. Em relação ao enraizamento adventício, a técnica de indução não influenciou o enraizamento de estacas, apresentando variação entre as diferentes matrizes.

show abstract

“Lateral Control”: Phytohormone Relations in the Conifer Treetop and the Short- and Long-Term Effects of Bud Excision in Abies nordmanniana

Cited by 9 publications

References 36 publications

CLONAL FORESTRY OF Piptocarpha angustifolia: SURVIVAL AND GROWTH VIGOR IN FIELD CONDITIONS

CLONAL FORESTRY OF Piptocarpha angustifolia: SURVIVAL AND GROWTH VIGOR IN FIELD CONDITIONS

Characterization of Top Leader Elongation in Nordmann Fir (Abies nordmanniana)

EPICORMIC SHOOTS INDUCTION AND ROOTING CUTTINGS OF Calophyllum brasiliense

Contact Info

Product

Resources

About