Intra-specific variation in carbohydrate reserves and sprouting ability in Eucalyptus obliqua seedlings

Walters, Judi R.; Bell, Tina L.; Read, Stephen

doi:10.1071/bt04016

Cited by 26 publications

(29 citation statements)

References 33 publications

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“…Lignotubers occur in many taxa and are belowground swellings at the base of the stem harbouring carbohydrate stores and dormant buds. Shoots develop from lignotubers after severe damage to the main plant stem from, for example, drought, fire, or herbivory (Borzak, Potts, Barry, Pinkard, & O'Reilly‐Wapstra, ; Lloret, Verdu, Flores‐Hernandez, & Valiente‐Banuet, ; Paula & Pausas, ; Walters, Bell, & Read, ). Quantitative genetic studies have shown that lignotuber size is highly heritable (Whittock et al, ) and in some species is likely to be an important adaptation for survival in drier environments (Gauli, Vaillancourt, Bailey, Steane, & Potts, ; Walters, Bell, & Read, ; Whittock et al, ).…”

Section: Introductionmentioning

confidence: 99%

Independent genetic control of drought resistance, recovery, and growth of Eucalyptus globulus seedlings

Ammitzboll

Vaillancourt

Potts

et al. 2019

Plant Cell & Environment

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Drought is a major stress impacting forest ecosystems worldwide. We utilized quantitative trait loci (QTL) analysis to study the genetic basis of variation in (a) drought resistance and recovery and (b) candidate traits that may be associated with this variation in the forest tree Eucalyptus globulus. QTL analysis was performed using a large outcrossed F2 mapping population from which 300 trees were phenotyped based on the mean performance of their open‐pollinated F3 progeny. Progenies were grown in a glasshouse in a randomized complete block design. A subset of seedlings was subjected to a drought treatment after which they were rewatered and scored for damage and growth postdrought. Nondroughted seedlings were assessed for growth traits as well as lignotuber size and resprouting following severe damage to the main stem. QTL were detected for most traits. Importantly, independent QTL were detected for (a) drought damage and plant size, (b) drought damage and growth recovery, and (c) lignotuber size and resprouting capacity. Such independence argues that trade‐offs are unlikely to be a major limitation to the response to selection and at the early life history stage studied; there are opportunities to improve resilience to drought without adverse effects on productivity.

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Section: Introductionmentioning

confidence: 99%

Independent genetic control of drought resistance, recovery, and growth of Eucalyptus globulus seedlings

Ammitzboll

Vaillancourt

Potts

et al. 2019

Plant Cell & Environment

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“…A maior taxa inicial de crescimento da brotação, em comparação à de plantas estabelecidas a partir de mudas, se deve, principalmente, à presença de um sistema radicular já estabelecido, o que facilita a absorção de água e nutrientes e o uso de reservas orgânicas e inorgânicas, presentes na cepa ou nas raízes (Blake, 1983;Reis & Kimmins, 1986;Teixeira et al, 2002;Kabeya & Sakai, 2005;Walters et al, 2005). Reis & Kimmins (1986) observaram que, após decepa de plantas jovens de eucalipto que cresciam em vasos, o sistema radicular contribuiu com 75% do fósforo requerido para o crescimento dos brotos, em solo relativamente fértil, e 100%, em solo pouco fértil, 1,5 mês após decepa das plantas.…”

Section: Introductionunclassified

Decepa de plantas jovens de eucalipto e manejo de brotações, em um sistema agroflorestal

Reis

Leite

et al. 2008

Pesq. agropec. bras.

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Resumo -O objetivo deste trabalho foi avaliar o uso de decepa de plantas jovens de eucalipto, para produção de árvores de menor diâmetro, com colheita facilitada por pequenos produtores; ou para recuperação de povoamentos jovens severamente danificados e produção de biomassa para energia em ciclos curtos. O experimento foi conduzido em sistema agroflorestal, com espaçamento entre plantas de 9,5x4 m. O crescimento de plantas intactas foi comparado ao de brotações de decepas realizadas aos nove ou doze meses após plantio. Aos seis ou nove meses após a decepa, realizou-se a desbrota, para deixar dois ou três brotos por cepa. Quando a desbrota foi realizada aos 12 meses após a decepa, todos os brotos dominantes foram deixados. Um tratamento sem desbrota também foi avaliado. Aos 42 meses após plantio, o tratamento sem desbrota apresentou o mesmo número de brotos por cepa que o de plantas desbrotadas para três brotos. O diâmetro das brotações foi equivalente a 69% do valor estimado para as plantas intactas. O valor assintótico de produção das brotações, da maioria dos tratamentos de decepa aos nove meses, foi igual ao das plantas intactas, o que evidencia a viabilidade da decepa sem a realização da desbrota, em sistemas agroflorestais.Termos para indexação: Eucalyptus, clone de eucalipto, desbrota, madeira para carvão, recuperação de povoamentos. Juvenile eucalypt plant coppicing and sprout management in agroforestry systemAbstract -This study aimed to evaluate juvenile eucalypt clone plant coppicing, in order to obtain small diameter logs, in the first rotation, which facilitates harvesting by small farmers; or to recover damaged young stands and to produce biomass for energy in short rotations. The experiment was carried out in an agroforestry system with 9.5x4 m spacing. Intact plant growth was compared to sprout growth from coppicing at nine and twelve months after planting. At six or nine months after coppicing, sprout thinning was carried out to leave two or three sprouts per stump. When thinning was done after 12 months of coppicing, all dominant sprouts were left. A treatment without thinning was also evaluated. Forty-two months after planting, treatment without thinning showed about the same amount of sprouts per stump as those thinned to three sprouts per stump. The estimated asymptotic value for sprout diameter was 69% of that for intact plants. The asymptotic value for sprout production, for most treatments of plants coppiced nine months after planting, was similar to that obtained for intact plants, which indicates that coppicing young eucalypt plants, without sprout thinning, can be used in agroforestry systems.

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“…Sims et al (2001) reported that the mean coppice height and biomass of Eucalyptus, Salix, Populus and Acacia were significantly higher than that of the first rotation, when harvested at the age of 3 years. The fast coppice growth in younger ages is a result of organic and inorganic reserves utilization from the stump or the root system as well as water and nutrient absorption by the established root system (Reis and Kimmins 1986;Oliveira et al 1994;Teixeira et al 2002;Kabeya and Sakai 2005;Luostarinen and Kauppi 2005;Walters et al 2005;Drake et al 2009Drake et al , 2012.…”

Section: New Forestsmentioning

confidence: 97%

Growth of intact plants and coppice in short rotation eucalypt plantations

Souza

Reis

et al. 2015

New Forests

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The growth of intact plants and coppice of juvenile plants of eight eucalypt clones (3 9 3 m spacing) was evaluated in the savanna region, Brazil (17°36 0 09 00 S and 46°42 0 02 00 W), aiming for biomass production for energy in short rotations. The treatments included intact plants and juvenile plant coppice (cut at 13 months of age). Coppice was managed either with thinning to two sprouts/stump at 9 months after harvesting or without sprout thinning. The diameter of the intact plants was greater than that of coppice for clones 58, GG100, 26 and 8B, and no differences were noted between treatments for the other clones. Yield did not differ between the thinned and unthinned sprouts for most clones. At younger ages, the coppice yield was greater than that of the intact plants for most clones. Later, there was a decline in the coppice yield, and intact plants surpassed coppice. Then, the maximum coppice mean annual increment was achieved at younger ages than for the intact plants, which resulted in coppice rotation age shortening. The greatest differences between the coppice and intact plants yield was between 38 and 40 months, when the coppice yield was 59, 56, 127, 149 and 75 % greater than that of the intact plants, for the clones 58, GG100, 1000, 36 and 910, respectively. Clone GG100 revealed the highest yield estimation among the intact and coppice plants. The results indicate that by coppicing juvenile eucalypt clone plants, in dense stands, it is possible to produce biomass for energy, without sprout thinning, if rotation age is shortened.

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Intra-specific variation in carbohydrate reserves and sprouting ability in Eucalyptus obliqua seedlings

Cited by 26 publications

References 33 publications

Independent genetic control of drought resistance, recovery, and growth of Eucalyptus globulus seedlings

Independent genetic control of drought resistance, recovery, and growth of Eucalyptus globulus seedlings

Decepa de plantas jovens de eucalipto e manejo de brotações, em um sistema agroflorestal

Growth of intact plants and coppice in short rotation eucalypt plantations

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