Phosphorus accumulation by lignotubers of jarrah (Eucalyptus marginata Donn ex Sm.) seedlings grown in a range of soils

Dell, B.; Jones, S.; Wallace, IM

doi:10.1007/bf02182897

Cited by 12 publications

(4 citation statements)

References 12 publications

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“…Lignotubers are viewed as important storage organs for carbohydrates and nutrients which may play a critical role in the recovery process after disturbances (Mullete & Bamber 1978; DeSouza, Silka & Davis 1986). However, the function of lignotubers as resource storage structures has always been inferred indirectly from studies on plant growth (DeSouza et al 1986; Castell, Terradas & Tenhunen 1994), anatomical structure (Montenegro, Avila & Schatte 1983) or tissue analysis of lignotuber nutrient and carbohydrate contents (Mullete & Bamber 1978; Lopez 1983; Dell, Jones & Wallace 1985). To date, however, direct quantitative observations have not been reported on the use of lignotuber reserves to support regrowth after disturbances.…”

Section: Introductionmentioning

confidence: 99%

Lignotuber reserves support regrowth following clipping of two Mediterranean shrubs

1998

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Summary 1.We investigated whether reserves stored in the lignotubers of two Mediterranean shrubs, Arbutus unedo and Erica arborea, were significantly mobilized to support the demands of regrowth and respiration after clipping the tops at different frequencies. 2. After a single clipping, Arbutus showed a 29% decrease of phosphorus concentration by the end of the first growing season. Two years after recovery from clipping, the starch levels remained lower than those of unclipped plants. Similarly, Erica showed depletion of starch, but no nutrient reserves were depleted significantly. 3. Regrowth after multiple clippings mobilized a large fraction of the starch and nutrients stored in the lignotuber. Mean starch concentrations were depleted by 87-93% after multiple clippings and concentrations of nitrogen, phosphorus, potassium and magnesium were depleted by 10-45%, 27-41%, 19-39% and 23-31%, respectively. 4. An average-sized lignotuber produced 288 resprouts for Arbutus and 1990 resprouts for Erica during a 27 month period of multiple clippings, at the end of which the first plants died. 5. Plant mortality after multiple clipping was 10% for Arbutus and 30% for Erica, and was primarily attributed to exhaustion of carbon reserves because starch concentrations decreased by 96% in dead plants.

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Section: Introductionmentioning

confidence: 99%

Lignotuber reserves support regrowth following clipping of two Mediterranean shrubs

1998

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“…Resprouting from lignotubers has frequently been considered a plant trait associated with fire or other disturbances (Beadle 1940;Gill 1981;James 1984). The lignotuber is the organ in which the plant accumulates vegetative buds and resources, such as carbohydrates or nutrients (Bamber & Mullete 1978;Dell et al 1985), which allow rapid regrowth after the above-ground parts have been removed by a disturbance. Since part of this organ is buried, it survives disturbances such as fire (Beadle 1940).…”

Section: Introductionmentioning

confidence: 99%

Lignotuber size of Erica australis and its relationship with soil resources

Cruz

Moreno

2001

J Vegetation Science

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Abstract. It has been proposed that resprouting after a disturbance would be favoured under conditions of low soil resource availability. In lignotuberous plants of Mediterranean‐type areas, successful resprouting after disturbances such as fire depends on the size of the lignotuber, but little is known about the role of soil resources in determining the relative size of this organ. In this work we tested whether the relative size of the lignotuber in the resprouting shrub Erica australis is related to the availability of soil resources. At each of 13 different sites in Spain, 10 plants were chosen and the sizes of their various parts (above‐ and below‐ground) measured. Additionally, at each site we evaluated soil fertility, foliar N and P concentrations and plant water potential in the middle of the summer. The relationships between lignotuber dimensions and the various plant parts were assessed. In all cases, significant differences between sites were found indicating consistent differences in lignotuber size across the range of plant sizes. This was particularly the case when lignotuber dimensions were expressed as a function of foliar biomass. Lignotuber dimensions relative to foliar biomass were positively correlated with soil pH and negatively with plant water potentials in midsummer. There were, however, no clear relationships between lignotuber relative dimensions and soil N and P contents or other measures of site productivity. In summary, lignotubers were not smaller at more productive sites, in fact they were relatively larger at sites where soils were less acidic, but where plant water conditions were less favourable. These findings contradict predictions made based on current theory on the role of soil fertility allocation to resprouting.

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“…The development of a lignotuber at an early stage of B. attenuata growth allows vulnerable seedlings and juveniles to rapidly acquire resprouting ability after fire and other disturbances that may kill aerial shoots. Given its apparent adaptive advantages, many species in mesic banksia woodland and jarrah forest in SWA, such as Eucalyptus marginata (Dell et al ), B. grandis (Burrows ) and B. menziesii (Groom and Lamont ), develop a lignotuber at the seedling stage but become a tree with a main trunk by the adult stage.…”

Section: Discussionmentioning

confidence: 99%

“…In shrubby B. attenuata , carbon and nutrient resources are allocated for the growth of the lignotuber itself, as it is a store of resources required to support post‐fire bud burst and early shoot growth (Clarke et al ). For example, Dell et al () reported that phosphorus concentration in the E. marginata lignotuber is twice as high as in the stems. In addition, the presence of many equal stems implies that the allocation of resources to each stem will be diluted.…”

Section: Discussionmentioning

confidence: 99%

Environmental drivers and genomic architecture of trait differentiation in fire‐adaptedBanksia attenuataecotypes

Lamont²,

Enright

et al. 2018

JIPB

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Trait divergence between populations is considered an adaptive response to different environments, but to what extent this response is accompanied by genetic differentiation is less clear since it may be phenotypic plasticity. In this study, we analyzed phenotypic variation between two Banksia attenuata growth forms, lignotuberous (shrub) and epicormic resprouting (tree), in fire-prone environments to identify the environmental factors that have driven this phenotypic divergence. We linked genotype with phenotype and traced candidate genes using differential gene expression analysis. Fire intervals determined the phenotypic divergence between growth forms in B. attenuata. A genome-wide association study identified 69 single nucleotide polymorphisms, putatively associated with growth form, whereas no growth form- or phenotype-specific genotypes were identified. Genomic differentiation between the two growth forms was low (F = 0.024). Differential gene expression analysis identified 37 genes/transcripts that were differentially expressed in the two growth forms. A small heat-shock protein gene, associated with lignotuber presence, was differentially expressed in the two forms. We conclude that different fire regimes induce phenotypic polymorphism in B. attenuata, whereas phenotypic trait divergence involves the differential expression of a small fraction of genes that interact strongly with the disturbance regime. Thus, phenotypic plasticity among resprouters is the general strategy for surviving varying fire regimes.

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Phosphorus accumulation by lignotubers of jarrah (Eucalyptus marginata Donn ex Sm.) seedlings grown in a range of soils

Cited by 12 publications

References 12 publications

Lignotuber reserves support regrowth following clipping of two Mediterranean shrubs

Lignotuber reserves support regrowth following clipping of two Mediterranean shrubs

Lignotuber size of Erica australis and its relationship with soil resources

Environmental drivers and genomic architecture of trait differentiation in fire‐adaptedBanksia attenuataecotypes

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