Plant stored reserves do not drive resprouting of the lignotuberous shrub <i>Erica australis</i>

Cruz, Alberto; Pérez, Beatriz; Moreno, José M.

doi:10.1046/j.1469-8137.2003.00668.x

Cited by 63 publications

(59 citation statements)

References 34 publications

(54 reference statements)

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“…Biddington and Dearman 1985;Fritz et al 2004;Puijalon and Bornette 2004). The effects of stresses on the quality of resources stored could lead to an absence of correlation (as in the present study), or even to a negative correlation between the size of the storage organ and resprouting ability (Cruz et al 2003).…”

Section: Stem Survival and Regeneration After Disturbancementioning

confidence: 46%

Abiotic stresses increase plant regeneration ability

2007

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In disturbed habitats, vegetative regeneration is partly ruled by plant reserves and intrinsic growth rates. Under nutrient-limiting conditions, perennial plants tend to exhibit an increased allocation to storage organs. Under mechanically stressful conditions, plants also tend to increase allocation to below-ground biomass and storage organs. We tested whether those stresses acting differently on plants (nutrient level versus mechanical forces) led to similar effect on storage organs and regeneration ability. We measured, for an aquatic plant species, (1) the size and allocation to storage organs (stems) and (2) the regeneration ability of the storage organs. Plant stems were collected in 4 habitats ranked along a nutrient stress gradient, and having encountered null versus significant mechanical stress (flowing water). All stems were placed in similar neutral conditions and left for a period of 6 weeks before measuring their survival and growth. Dry mass allocation to the storage organ (stem) was higher in stressful habitats. Moreover, stress encountered by plants before the experiment significantly affected regeneration: stems of previously stressed plants (i.e. plants that had grown in nutrient-poor or mechanically stressful habitats) survived better than unstressed ones. Stems of plants having encountered mechanical stress before the experiment had increased growth in nutrient-rich habitats but reduced growth in the poorest habitats. These results demonstrate that regeneration could rely on the level of stress previously encountered by plants. Stress could lead to greater regeneration ability following mechanical failure. The possible mechanisms involved in these results are discussed.

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Section: Stem Survival and Regeneration After Disturbancementioning

confidence: 46%

Abiotic stresses increase plant regeneration ability

2007

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“…Since trees were sampled for TNC after seven events, it would be interesting to follow how the TNC levels change as the cutting cycles are increased to more than seven because it has been proposed that mortality in trees eventually occurs if the reserves are sufficiently depleted through trees being repeatedly clipped (Cruz et al 2003;Miyanishi and Ellman 1986;Wildy and Pate 2002).…”

Section: Effects On Foliar Propertiesmentioning

confidence: 99%

“…The process of replenishing stored carbohydrate reserves is largely dependent on trees striking the balance in being able to photosynthesize efficiently, grow sufficiently and then being able to have excess carbon for storage; all of this being dependent on soil moisture content and nutrient status (Cruz et al 2003). However, little is known about the factors that control the reserve content of a plant, how much of the reserve is utilized after a disturbance such as a harvest (Cruz et al 2003), and the changes in the recovery of nutrients such as nitrogen and carbon lost during a disturbance. These factors have significant implications for the sustainable use of rangelands subjected to intensive wood harvesting.…”

Section: Introductionmentioning

confidence: 99%

The effects of repeated cutting on coppice response of Terminalia sericea

Moyo

Scholes

Twine

2014

Trees

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Key message Although exposure to multiple cutting cycles reduces stored reserves, shoot diameter and shoot length, it, however, increases shoot production per resprouting stump and foliar nitrogen. Abstract In disturbance-prone environments with fluctuating seasonal rainfall such as savannas, the repeated cutting of the same trees eventually results in a possible decline in tree abundance. The effects of subjecting Terminalia sericea trees to one, two and multiple (eight) cutting events over a period of 2 years on coppice response were investigated in a savanna woodland in South Africa. Resprout shoot diameter, shoot length and the total cumulative diameter were lower in trees exposed to a high number of cutting events compared to trees exposed to one cutting event. Increasing the number of cutting events significantly reduced stem total non-structural carbohydrate levels in trees indicating a depletion of stored reserves. Foliar carbon content remained largely the same, while leaf nitrogen and phosphorus concentrations significantly increased with each cutting event, relative to uncut trees. Results indicate that trees cut once had not replenished depleted carbohydrate reserves even after a period of 18 months during which no cutting took place. Sustainable utilization of this tree species must allow for at least more than 18 months of undisturbed growth between harvests to allow for the replenishing of reserves.

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“…Furthermore, resprouting structures are neither a preferential sink for mineral nutrients compared with seeds nor are stored mineral nutrients important in resprouting (Witkowski and Lamont 1996;Cruz et al 2003). Leaf concentration of highly mobile phosphorus on a mass basis, but not nitrogen, potassium, or sodium, was higher among non-sprouters than resprouters in a comprehensive study of Mediterranean Basin shrubs (Saura-Mas and Lloret 2009).…”

Section: Reasons For Low Fecundity Among Resproutersmentioning

confidence: 99%

Fitness and evolution of resprouters in relation to fire

Lamont

Enright

2011

Plant Ecol

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There are many ways that plants may recover vegetatively from dieback caused by fires. Compared with fire-killed species, the presence of woody resprouters in fire-prone floras increases with fire frequency, though this is affected by site productivity that may have opposing correlates along different gradients. Population recovery is enhanced by resprouting when fecundity is low and/or seedling recruitment is not guaranteed. There is resource cycling between vegetative growth and storage but no clear trade-off between fecundity and storage, and more attention needs to be given to the role of somatic mutations in reducing fecundity. Seven fitness benefits of post-fire resprouting are noted that centre around the rapid return to adult growth rates and early flowering and seed set without the risks of recruitment failure. The extent of resprouting at the individual, population, and species levels varies greatly but it is under genetic control. Recent studies on the evolution of resprouting in fire-prone systems have shown that types of resprouting (clonality, rootstocks, epicormic bud strands) are derived from surrounding parent lineages lacking these traits and confined to nonfire-prone environments. The oldest lineages with firerelated resprouting date to at least 61 million years ago, indicating that seed plants have had a long evolutionary relationship with fire. Various genetic mechanisms, including beneficial somatic mutations, have been invoked to explain how speciation of resprouters may keep pace with non-sprouters.

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Plant stored reserves do not drive resprouting of the lignotuberous shrub Erica australis

Cited by 63 publications

References 34 publications

Abiotic stresses increase plant regeneration ability

Abiotic stresses increase plant regeneration ability

The effects of repeated cutting on coppice response of Terminalia sericea

Fitness and evolution of resprouters in relation to fire

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