Physiological and growth responses related to pattern and severity of green pruning in young Eucalyptus globulus

Pinkard, EA

doi:10.1016/s0378-1127(03)00046-x

Cited by 59 publications

(53 citation statements)

References 21 publications

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“…Up-regulation of photosynthetic rates in the remaining leaves following natural and artificial defoliation has been observed in many tree species (Chen et al, 2001;Reich et al, 1993;Vanderklein and Reich, 1999) including in eucalypt species (Pinkard, 2003;Turnbull et al, 2007). Up-regulation is likely to play an important role in minimising the impact of defoliation on growth (e.g.…”

Section: Discussionmentioning

confidence: 99%

Do artificial and natural defoliation have similar effects on physiology of Eucalyptus globulus Labill. seedlings?

et al. 2010

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Abstract• Artificial defoliation is often used to simulate defoliation by herbivory and is usually considered a good indication of a plant's response to a given type of damage. However, the findings of studies directly comparing the two defoliation types are inconsistent.• Here, the short term effects of artificial and insect defoliation by larvae of Paropsisterna agricola on growth, biomass allocation and photosynthetic capacity of Eucalyptus globulus seedlings were compared in a glasshouse experiment. The artificial defoliation was carried out to closely resemble the spatial patterns observed for insect defoliation.• Height and diameter increments were reduced as a result of insect defoliation, whereas artificial defoliation had no significant effect on height. Increased photosynthetic capacity was observed in response to both treatments, but the magnitude of this increase was larger in insect-than in artificially-defoliated seedlings. Significant reductions in foliar carbohydrate content and total biomass were noticeable in artificially-defoliated seedlings. Although the foliar carbohydrate levels also decreased across the crown zones following insect defoliation treatment, seedlings allocated a large amount of their biomass in the branches of the damaged zone.• Despite our best endeavours to simulate insect defoliation in the artificial treatment, the latter may not reflect accurately the full strength of the effects. However, artificial and insect defoliation were similar in their direction of the responses they caused in E. globulus seedlings. Mots-clés :Paropsisterna agricola / croissance / allocation de la biomasse / capacité de la photosynthèse / glucides Résumé -Les défoliations artificielle et naturelle ont-elles des effets similaires sur la physiologie de jeune plants d'Eucalyptus globulus Labill. ?• La défoliation artificielle est couramment employée pour simuler la défoliation par les insectes herbivores et elle est généralement considérée comme un bon indicateur de la réponse des plantes pour un type de dommage donné. Cependant, les résultats d'études comparant directement les deux types de défoliation sont inconsistants.• Ici, les effets court terme des défoliations artificielles et naturelles par la larve de Paropsisterna agricola ont été comparés au plan de la croissance, de l'allocation de la biomasse et de la capacité de photosynthèse dans une expérimentation conduite en serre. La défoliation artificielle a été menée pour ressembler étroitement aux modèles spatiaux observés avec la défoliation par les insectes.• À la suite de la défoliation par les insectes, les accroissements en hauteur et en diamètre ont été ré-duits, alors que la défoliation artificielle n'a eu aucun effet significatif sur la hauteur. L'augmentation de la capacité de photosynthèse a été observée en réponses aux deux traitements, mais l'ampleur de cette augmentation a été plus forte pour les plants défoliés par les insectes que pour les plants artificiellement défoliés. Des réductions significatives de la teneur foliaire en...

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Section: Discussionmentioning

confidence: 99%

Do artificial and natural defoliation have similar effects on physiology of Eucalyptus globulus Labill. seedlings?

et al. 2010

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“…Pires (2000) verificou que com a remoção de 50% da altura da copa viva de plantas de Eucalyptus grandis com 1 ano de idade, houve remoção de 81% da área foliar total. Pinkard (2003) recomendou remoção de até 20% de área foliar em sítios pobres e até 40% em sítios mais produtivos. Porém, deve-se levar em conta, também, a capacidade de recuperação e crescimento da copa, o que influencia o posterior crescimento do tronco das plantas (PINKARD, 2002;LIMA, 2003;PULRONIK et al, 2005).…”

Section: Resultsunclassified

“…Contudo, remoção drástica de ramos das árvores implica retirada de folhas da porção mediana da copa, com elevada capacidade fotossintética (BEADLE et al, 2007). Isso pode promover redução no crescimento das plantas (PIRES et al, 2002;PINKARD, 2003), devido à lenta recomposição de copa. Desse modo, a definição adequada da intensidade, da frequência e da idade das plantas, por ocasião da aplicação da desrama artificial, evita comprometer o crescimento, além de manter o núcleo nodoso reduzido, com consequente aumento da produção de madeira limpa (POLLI et al, 2006).…”

Section: Introductionunclassified

Crescimento de um clone de eucalipto submetido a desrama e desbaste

Monte¹,

Reis

et al. 2009

Rev. Árvore

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Cerrado, no espaçamento inicial de 3 x 3 m, foram submetidas à desrama artificial e ao desbaste. Os tratamentos de desrama tiveram início em três idades diferentes: 16, 20 ou 28 meses. Foram utilizadas três a quatro intervenções de desrama, com remoção de copa em diferentes alturas, para atingir 6 m de fuste livre de nó, quando se iniciou a desrama aos 16 ou 20 meses, e duas a três intervenções, quando se iniciou aos 28 meses. Foram aplicados dois tratamentos de desbaste aos 55 meses, com remoção de 0 e 35% do número de mudas plantadas. O crescimento foi avaliado no período pós-desbaste, entre 55 e 93 meses de idade, por meio da análise do diâmetro (DAP), altura total (Ht), volume com casca (V), incremento periódico anual pós-desbaste (IPA) e incremento médio anual (IMA). Aos 93 meses, não foram observadas diferenças significativas (p>0,05) em DAP, Ht, V, IPA e IMA, entre os tratamentos de desrama, e na interação entre desrama e desbaste. No tratamento desramado até 1,5 m de altura, aos 16 meses, houve remoção de 80% da biomassa de folhas e galhos. Nesse tratamento, 65% dos indivíduos estavam com DAP inferior a 15 cm, em comparação com 35% nos demais tratamentos. A Ht no povoamento desbastado foi menor (p≤0,05) do que no não desbastado. O V, o IPA e o IMA foram, respectivamente, de 7,9, 23,0 e 7,3% mais elevados (p≤0,05) no povoamento desbastado, quando a primeira intervenção de desrama foi aplicada aos 20 meses. O povoamento não desbastado teve crescimento estagnado aos 80 meses. No desbastado, essa estagnação deverá ocorrer entre 100 e 110 meses de idade, indicando necessidade de aplicação do segundo desbaste nessa faixa etária, para obtenção de toras de maior diâmetro e, consequentemente, maior extensão de madeira limpa.Palavras-chave: Crescimento de plantas, desbaste e desrama artificial. GROWTH OF EUCALYPT CLONE SUBMITTED TO PRUNING AND THINNING ABSTRACT -Plants of

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“…The upregulation in photosynthetic rate increases with the severity of defoliation. Similarly, more severe defoliation results in a greater increase in the net photosynthesis rate than less severe defoliation [10]. Such photosynthetic upregulation allows species to compensate, to some degree, for the loss of leaf area [12,44].…”

Section: Discussionmentioning

confidence: 99%

“…Defoliation may have negative effects on tree growth by decreased leaf area and reduced carbohydrate supply [7,8]. However, the influence of defoliation on the growth of trees is not always consistent because of the differences in frequency [9], severity, pattern [10], timing [11], and growth stage [12]. Following defoliation, plants seek to maintain leaf regrowth through compensatory growth, which is defined as the restoration of morphological and physiological changes that occur in plants following defoliation [13].…”

Section: Introductionmentioning

confidence: 99%

Sex-specific responses of Populus deltoides to defoliation

Duan

et al. 2017

Acta Soc Bot Pol

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There has been an increasing interest in understanding the differential effects of sexual dimorphism on plant stress responses. However, there is no clear pattern in the responses of the sexes to defoliation. In this study, the effects of different severity of artificial defoliation on biomass production, total nonstructural carbohydrate (NSC) concentration, and photosynthetic rate (P N ) of male and female Populus deltoides were examined. We used half and full defoliation to observe the differences between the sexes in three harvest dates (1 week, 4 weeks, and 8 weeks after treatments). We hypothesized that female and male P. deltoides compared with an undefoliated control would have compensatory growth in response to defoliation treatments. Results showed that half and full defoliation reduced the growth of both sexes. Following half defoliation, root growth was reduced, especially in males, at T2 (4 weeks after defoliation) and T3 (8 weeks after defoliation), while males showed an increase in height increment under the half defoliation compared with the nondefoliation treatments. By contrast, females were more negatively affected by defoliation than males in terms of biomass after 8 weeks. One week after defoliation, P N increased significantly in females and males under half defoliation (+30%, +32%, respectively) and full defoliation (+58%, +56%, respectively). However, 8 weeks after defoliation, there was little difference in P N between defoliated and undefoliated female cuttings. Increases in stomatal conductance (g s ) and leaf nitrogen were observed under fully defoliated female and male cuttings. Moreover, males had less NSC concentrations following half defoliation compared with females. Our results indicate that leaf compensatory growth in male cuttings of P. deltoides was maintained by obtaining greater photosynthetic capacity, higher leaf nitrogen, and lower NSC concentration following half and full defoliation. Our results highlight that females suffered from greater negative effects than did males following half defoliation, but under full defoliation, the differences between both sexes were subtle.

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Physiological and growth responses related to pattern and severity of green pruning in young Eucalyptus globulus

Cited by 59 publications

References 21 publications

Do artificial and natural defoliation have similar effects on physiology of Eucalyptus globulus Labill. seedlings?

Do artificial and natural defoliation have similar effects on physiology of Eucalyptus globulus Labill. seedlings?

Crescimento de um clone de eucalipto submetido a desrama e desbaste

Sex-specific responses of Populus deltoides to defoliation

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