Genetic variation among and within provenances and families of Eucalyptus grandis W. Hill and E. globulus Labill. subsp. globulus seedlings in response to salinity and waterlogging

Marcar, N. E.; Crawford, Debbie; Saunders, A.E.; Matheson, A. C.; Arnold, R.

doi:10.1016/s0378-1127(01)00518-7

Cited by 36 publications

(32 citation statements)

References 12 publications

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“…The results show that farmers who would like to establish nurseries for production of baobab root tubers (carrots) should choose the Chikwawa population as a first choice followed by the other mainland populations and avoid the Likoma Island population due to its inferiority. Marcar et al (2002) have shown that better performing Eucalyptus grandis provenances in glasshouse trials also performed equally well in the field trials. It may also follow therefore that if the biomass at seedling stage is maintained up to later stages, as expressed through the differences in biomass and its partitioning in this study, then this might already be an indication of populations that will have superior growth later (Ngulube et al 1997).…”

Section: Seedling Growthmentioning

confidence: 87%

“…A number of population genetics studies through nursery studies have been done (Andersen et al 2008;Marcar et al 2002;Masamba et al 1999;Mwase et al 2007;Mwitwa et al 2008;Munthali 1999;Ngulube 1996;Sniezko and Stewart 1989).…”

Section: Seedling Growthmentioning

confidence: 99%

“…Narrow-sense heritabilities provide a basis for predicting the genetic gain that could be achieved from selection on a particular trait (Marcar et al 2002). The estimates in Table 3 have shown that there were considerable differences in genetic control of traits.…”

Section: Heritabilitymentioning

confidence: 99%

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Genetic variation among and within provenances of Adansonia digitata L. (Baobab) in seed germination and seedling growth from selected natural populations in Malawi

2012

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Baobab (Adansonia digitata L) trees have a wide variety of subsistence and economic values across sub-Saharan Africa. Knowledge of the genetic variation within and between the species is essential for management and designing domestication, improvement and conservation strategies.Fifty-nine half-sib families were evaluated in the nursery to determine the genetic variation and control within and between the populations from four silvicultural zones. Seed germination and seven seedling growth parameters were assessed. Total phenotypic variance, family variance, within family variance, individual narrow sense heritability, and additive genetic coefficient of variation (AGCV) were derived from observed and expected mean squares. There were highly significant differences in seed germination, plant height, root collar diameter, number of leaves, shoot height and diameter, tuber diameter and weight. Provenance variation in germination ranged from 46.7 ±3.3% to 68.7±3.3% while tree -to-tree variation ranged from 6.3±8.6% to 95.5±8.6%. Coefficient of variation in seedling growth variables ranged from 18.6% to 43.6%.Individual narrow sense heritabilities (h 2 ) ranged from 0.07 to 0.71. AGCV ranged from 3.21% to 14.67%. Morphological traits showed that mainland populations were genetically distant from the island one. High and moderate additive genetic control of traits and AGCV show the potential that Baobab can also respond well to tree improvement. High phenotypic variation found in the study offers an opportunity to effect selection of superior attributes at both provenance and individual tree-to-tree level.

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Section: Seedling Growthmentioning

confidence: 87%

Section: Seedling Growthmentioning

confidence: 99%

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Genetic variation among and within provenances of Adansonia digitata L. (Baobab) in seed germination and seedling growth from selected natural populations in Malawi

2012

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“…Relatively high contents of Cl À have been found in Eucalyptus tree components (e.g. Laclau, 2001;Marcar et al, 2002;Adams et al, 2005). Cl À applications have a strong beneficial effect on the yields of coconut and oil palm plantations, as well as on the drought resistance of coconuts (Bonneau et al, 1997).…”

Section: Effects Of K and Na Fertilizer Additions On Tree Growthmentioning

confidence: 99%

A positive growth response to NaCl applications in Eucalyptus plantations established on K-deficient soils

Almeida

Laclau

Gonçalves³

et al. 2010

Forest Ecology and Management

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“…Fresh-water inputs into coastal systems can reduce the level of soil salinity (DeLaune et al 2003); however, waterlogging and salinity together have been proven to provoke wetland vegetation death, assembling the harmful effects of both stresses (Barrett-Lennard 2003;Wang et al 2010). In fact, salinity may compromise flood tolerance mechanisms (Salter et al 2010), preventing adventitious root formation (Akilan et al 1997;Salter et al 2008) and increasing Na + and Cl À concentration in the foliage of plants under flooding conditions (Marcar et al 2002). Water level reduction after fresh-water flooding, as a result of water evapotranspiration and/or drainage, may allow the reestablishment of the previous soil water status and aeration; contrarily, in the case of salinewater flooding, a water level decrease implies an accumulation of salt in the soil, negatively affecting the plant growth.…”

Section: Introductionmentioning

confidence: 99%

Photosynthetic and wood anatomical responses of Tamarixafricana Poiret to water level reduction after short‐term fresh‐ and saline‐water flooding

Jaoudé

Dato

Angelis

2012

Ecological Research

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In the Mediterranean basin, Tamarix spp. constitute important populations along rivers and sea coasts, and might be primarily subjected to water level fluctuations and salinization, as a consequence of global climate change. Here, we analyze leaf gas exchange and xylem anatomy during a water level decrease below the soil surface after short‐term flooding with fresh‐ and saline‐water (200 mM) in order to predict Tamarixafricana Poiret responses under future environmental conditions. Fresh‐water level reduction negatively affected stomatal conductance (−56.3 %), but only when water decreased to the lowest level (15 cm below the soil surface). No effects on assimilation rates and xylem vessel dimensions occurred. Under saline conditions, the rate of the water level decrease was lower compared to the non‐saline treatment, as stomatal conductance was negatively affected by salinity (−59.5 %) and significantly declined over time. Moreover, decreases in mean xylem vessel area (−51.3 %), assimilation rates (−52.2 %) and stomatal conductance (−76.0 %) were also observed compared to the control, indicating both an osmotic stress and a toxic effect of NaCl on leaf gas exchange. These leaf responses were probably induced by greater belowground‐root salt absorption and transport compared to previous flooding conditions, as confirmed by the increase in salt excretion (+473.2 %). The results emphasize the survival risk of Tamarix spp. to water level variation under both saline and non‐saline conditions, and the need of management practices focused on the conservation of these populations.

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Genetic variation among and within provenances and families of Eucalyptus grandis W. Hill and E. globulus Labill. subsp. globulus seedlings in response to salinity and waterlogging

Cited by 36 publications

References 12 publications

Genetic variation among and within provenances of Adansonia digitata L. (Baobab) in seed germination and seedling growth from selected natural populations in Malawi

Genetic variation among and within provenances of Adansonia digitata L. (Baobab) in seed germination and seedling growth from selected natural populations in Malawi

A positive growth response to NaCl applications in Eucalyptus plantations established on K-deficient soils

Photosynthetic and wood anatomical responses of Tamarixafricana Poiret to water level reduction after short‐term fresh‐ and saline‐water flooding

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