Influence of stand density on growth and water use efficiency in Eucalyptus clones

Hakamada, Rodrigo; Hubbard, Robert M.; Moreira, Gabriela Gonçalves; Stape, José Luiz; Campoe, Otávio Camargo; Ferraz, Sílvio

doi:10.1016/j.foreco.2020.118125

Cited by 50 publications

(15 citation statements)

References 41 publications

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“…Relative gains for hydrological services (61 %) were twice as high as the relative losses of MAI (26 %) when management changed from IMC to MMC. Interestingly, each hydrological indicator had a different sensitivity to mean annual increment reduction, but it is possible that small reductions in productivity, for example, through the selection of less productive genetic materials (Gonçalves et al, 2017), or with high water use efficiency (Hakamada et al, 2020), will promote substantial gains in hydrological services. In this case, as an example of intermediate management intensity, a small reduction in MAI can result in double the gains of hydrological services (Figure 4).…”

Section: Water and Wood Supply At Different Forest Management Intensi...mentioning

confidence: 99%

“…However, this shows that it is possible to produce wood with less intensive management than those regimes currently applied in even-aged eucalyptus plantations supporting water supply (Whitehead and Beadle, 2004). The reduction in forest management intensity is suggested for preserving water resources (Almeida et al, 2016;Ferraz et al, 2019;Hakamada et al, 2020), with the potential benefit of improving biodiversity conservation (Brockerhoff et al, 2008(Brockerhoff et al, , 2013. However, the demand for these services at the local, regional, and global scale should be considered (Beier et al, 2015;Schulte et al, 2014) for assessing where reduction in management intensity is needed since it is important to find a balance between human needs and nature's ability to provide products and resources (Foley et al, 2005).…”

Section: Water and Wood Supply At Different Forest Management Intensi...mentioning

confidence: 99%

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Fast-growing forest management to regulate the balance between wood production and water supply

Cassiano

Moreira

Ferraz

2023

Sci. agric. (Piracicaba, Braz.)

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Increasingly, fast-growing forest plantations are able to support the wood supply but may simultaneously reduce water availability. The trade-off between wood production and water supply is more evident in areas with low water availability, high seasonal variation, or high water demand from local communities. The management regime adopted in forest plantations can either increase or reduce this trade-off. Thus, we assess herein the water and wood supply under different fast-growing forest plantation management regimes to understand how forest management practices can balance the provision of these services. The study was conducted at two catchments with a predominance of fast-growing forest plantations, namely, the mosaic management catchment (MMC) and the intensive management catchment (IMC). Rainfall and streamflow were monitored for three water years. Hydrological indexes were calculated to assess the hydrological regime of both catchments, and make inventories of the forest to assess forest growth rates. MMC had streamflow coefficients, baseflow index and baseflow stability higher than those of IMC. Mean annual wood increment was 32.73 m 3 ha -1 yr -1 in MMC, with a mean age of 15 years, and 44.40 m 3 ha -1 yr -1 in IMC at coppice in the second year. MMC hydrological indexes remained stable over the period studied, while in IMC the hydrological indexes were affected by climatic variations, mainly in drier years. MMC showed potential for supplying both water and wood. However, in IMC there was a trade-off between wood supply at the expense of the water supply. Thus, the intensity of fast-growing management can be adjusted to achieve a balance between water and wood supply on a catchment scale.

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Section: Water and Wood Supply At Different Forest Management Intensi...mentioning

confidence: 99%

Section: Water and Wood Supply At Different Forest Management Intensi...mentioning

confidence: 99%

Fast-growing forest management to regulate the balance between wood production and water supply

Cassiano

Moreira

Ferraz

2023

Sci. agric. (Piracicaba, Braz.)

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“…It is widely planted in many tropical and subtropical regions for pulp and paper production. Eucalyptus hybrids (e.g., E. grandis × E. urophylla ) combine fast growth with excellent wood quality and relatively high stress resistance; thus, they have been extensively used in commercial plantations, mostly in clonal forestry worldwide [ 1 , 2 , 3 ]. The excellent performance of Eucalyptus hybrids is the consequence of interactions between good genotype and environment [ 2 ].…”

Section: Introductionmentioning

confidence: 99%

Transcriptome-Based Construction of the Gibberellin Metabolism and Signaling Pathways in Eucalyptus grandis × E. urophylla, and Functional Characterization of GA20ox and GA2ox in Regulating Plant Development and Abiotic Stress Adaptations

Zhu

Wang

et al. 2023

IJMS

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Gibberellins (GAs) are the key regulators controlling plant growth, wood production and the stress responses in perennial woody plants. The role of GA in regulating the above-mentioned processes in Eucalyptus remain largely unclear. There is still a lack of systematic identification and functional characterization of GA-related genes in Eucalyptus. In this study, a total of 59,948 expressed genes were identified from the major vegetative tissues of the E. grandis × E. urophylla using transcriptome sequencing. Then, the key gene families in each step of GA biosynthesis, degradation and signaling were investigated and compared with those of Arabidopsis, rice, and Populus. The expression profile generated using Real-time quantitative PCR showed that most of these genes exhibited diverse expression patterns in different vegetative organs and in response to abiotic stresses. Furthermore, we selectively overexpressed EguGA20ox1, EguGA20ox2 and EguGA2ox1 in both Arabidopsis and Eucalyptus via Agrobacterium tumefaciens or A. rhizogenes-mediated transformation. Though both Arabidopsis EguGA20ox1- and EguGA20ox2-overexpressing (OE) lines exhibited better vegetative growth performance, they were more sensitive to abiotic stress, unlike EguGA2ox1-OE plants, which exhibited enhanced stress resistance. Moreover, overexpression of EguGA20ox in Eucalyptus roots caused significantly accelerated hairy root initiation and elongation and improved root xylem differentiation. Our study provided a comprehensive and systematic study of the genes of the GA metabolism and signaling and identified the role of GA20ox and GA2ox in regulating plant growth, stress tolerance, and xylem development in Eucalyptus; this could benefit molecular breeding for obtaining high-yield and stress-resistant Eucalyptus cultivars.

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“…Nossos resultados estão de acordo com estudos anteriores realizados com E. camaldulensis. Hakamada et al (2020) mostraram que plantas de um clone de eucalipto obtido do E. camaldulensis, cultivados em condição de campo, alocaram mais fotossimilados para a raízes como estratégia para evitar os efeitos negativos da seca. Além disso, híbridos de E. camaldulensis selecionados em regiões secas tendem a apresentar maior quantidade de raízes finas e maior comprimento do sistema radicular (Pinheiro et al, 2016).…”

Section: Resultsunclassified

Importância do cálcio na mitigação dos efeitos da restrição hídrica em eucalipto

Barros

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O cultivo de eucalipto está entre as atividades do setor florestal mais importantes para a economia brasileira e mundial. Recentemente, o déficit hídrico tem sido o fator abiótico que tem mais afetado o crescimento e a sobrevivência dessas florestas. Por este motivo, a seleção de clones mais tolerantes à seca tem sido uma das principais estratégias adotadas nos novos plantios. No entanto, é necessário compreender os mecanismos responsáveis pela tolerância à seca nessas plantas e a influência dos nutrientes nesses processos. Diversos estudos têm dado foco ao nutriente cálcio (Ca), como importante mitigador da tolerância à seca em plantas. Assim, o objetivo desta tese foi identificar a importância do Ca nos mecanismos de tolerância à seca e os mecanismos e efeitos do suprimento deste nutriente na expressão dos transportadores de Ca (MCA1 e ACA11) e das proteínas intrínsecas de membranas (PIP) em raízes de eucalipto. Para atingir esses objetivos, mudas do clone de eucalipto VM01 (E. urophylla × camaldulensis), caracterizado como tolerante à seca, foram cultivadas em sistema hidropônico na presença ou ausência de Ca e submetidas à restrição hídrica pelo uso de polietilenoglicol 6000. Os resultados obtidos mostram que a restrição hídrica aumenta a expressão do ACA11 (transportador de Ca do vacúolo) e diminui a expressão do MCA1 (transportador de Ca na endoderme). Isso resulta em maior concentração de Ca nas raízes do clone VM01 em condições de seca. Esse fato favorece o crescimento de raiz e maior relação raiz/parte aérea, importantes caraterísticas que favorecem a sobrevivência das plantas em condições de déficit hídrico. As plantas cultivadas na presença de Ca sob restrição hídrica apresentaram maior hidratação, menores danos oxidativos e maior atividade de enzima antioxidante. Além disso, observou-se que em geral no início da seca houve regulação positiva das PIP (aquaporinas), uma estratégia importante para aumentar a absorção de água. Por outro lado, com aumento do tempo de seca a regulação gênica foi negativa, estratégia também importante para evitar a perda de água. Dessa forma, espera-se que o trabalho auxilie na identificação de mecanismos para a seleção de clones tolerantes a seca, contribuindo para proteção e manejo de plantios de eucalipto. Palavras-chave: Tolerância à seca. Nutrição. Aquaporinas. Transportadores de cálcio

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Influence of stand density on growth and water use efficiency in Eucalyptus clones

Cited by 50 publications

References 41 publications

Fast-growing forest management to regulate the balance between wood production and water supply

Fast-growing forest management to regulate the balance between wood production and water supply

Transcriptome-Based Construction of the Gibberellin Metabolism and Signaling Pathways in Eucalyptus grandis × E. urophylla, and Functional Characterization of GA20ox and GA2ox in Regulating Plant Development and Abiotic Stress Adaptations

Importância do cálcio na mitigação dos efeitos da restrição hídrica em eucalipto

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