Understanding root growth capacity: theoretical considerations in assessing planting stock quality by means of root growth tests

Burdett, A. N.

doi:10.1139/x87-123

Cited by 62 publications

(45 citation statements)

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“…The new roots protruding from the root ball (root egress) are an indicator of plant vigour [5] and could be linked to the content of P, due to the effect of this element on metabolic processes and growth [31]. Using this parameter to predict the post-transplantation response of plants can have its limitations, however [48].…”

Section: Discussionmentioning

confidence: 99%

Nursery fertilisation affects the frost-tolerance and plant quality of Eucalyptus globulus Labill. cuttings

et al. 2007

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-Eucalyptus globulus is widely used in productive exotic plantations but the expansion of these plantations is limited by low temperatures, as its cold hardening capacity is limited (0.5 to 3.0 • C). It is not well understood how nursery fertilisation affects the field performance of plants. This led us to study the effect of three mineral nutrients (N, P and K) on both plant quality and frost tolerance. The experiment comprised eight growth treatments in which a high dose (H-) or a low dose (L-) of each nutrient was applied. Nitrogen was the nutrient that determined shoot growth, new root growth after transplanting (root egress), frost tolerance and field performance. Performance was better with treatment H-N than with treatment L-N, leaf nitrogen contents being 1.53 and 0.89% respectively. The effects of phosphorus and potassium were not significant between treatments for any parameter. The exception was P which, when interacting with N, favoured root egress for the H-N treatment. It was concluded that nursery fertilisation offers a management tool for eucalyptus growers concerned with plant stock quality.field performance / frost tolerance / mineral nutrients / non-structural carbohydrates / root egress Résumé -La fertilisation en pépinière affecte la tolérance au froid et la qualité des plants bouturés d'Eucalyptus globulus Labill. Eucalyptus globulus est largement utilisé dans des plantations exotiques productives, mais l'expansion de ces plantations est limitée par les basses températures, étant donné que l'endurcissement potentiel au froid de cette espèce est limité (0,5 à 3,0 • C). On ne comprenait pas bien comment la fertilisation en pépinière pouvait affecter la performance en plantation des plants. Ceci nous a amené à étudier l'effet de trois nutriments minéraux (N, P et K) sur la qualité des plants et la résistance au froid. L'expérimentation a comporté huit traitements pour l'étude de la croissance pour lesquels une forte dose (H-) ou une faible dose (L-) de chaque nutriment a été apportée. L'azote a été le nutriment qui a déterminé la croissance de la pousse, la croissance de nouvelles racines après transplantation (émission de racines), la résistance au froid et la performance en plantation. Les performances étaient meilleures avec le traitement H-N que avec le traitement L-N, la teneur en azote des feuilles atteignant respectivement 1,53 et 0,89 %. Les effets du phosphore et du potassium n'ont été significatifs pour aucun des paramètres. L'exception a concerné le phosphore qui lorsqu'il était en interaction avec l'azote a favorisé l'émission de racines dans le traitement H-N. On conclut de cette étude que la fertilisation en pépinière offre un outil de gestion pour les producteurs d'eucalyptus confrontés au problème de la qualité des plants.performance en plantation / tolérance au froid / nutriments minéraux / hydrates de carbones non structuraux / émission de racines

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Section: Discussionmentioning

confidence: 99%

Nursery fertilisation affects the frost-tolerance and plant quality of Eucalyptus globulus Labill. cuttings

et al. 2007

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“…Transplantation shock is thought to be due to plants being subjected to water deficits [7,17,18], this can be largely overcome through increased water uptake by new root production [8]. In Douglas fir, current photosynthate is thought to be the primary carbon source for new root growth, as little carbon is available from storage tissues [34,45].…”

Section: Discussionmentioning

confidence: 99%

“…The assessment of RGP was made after growth of seedlings for 14 days under controlled environment conditions: 20 °C, 75% RH (relative humidity) and an irradiance of 300 µmol m -2 s -1 , with a 16 h photoperiod [8,24]. Measurements of RGP were made at the end of cold storage on 7 median-size replicate plants, per lift date × storage treatment.…”

Section: Post Storage Assessments Of Root Growth Potential (Rgp) Andmentioning

confidence: 99%

“…In Douglas fir, new adventitious root production is required for water uptake and this is known to require current photosynthate [45]. However, both photosynthesis and root growth processes are limited under conditions of low temperature [8,9,11,34]. Therefore, outplanting in mid-winter may be less favourable than cold storage, even under Irish conditions.…”

Section: Introductionmentioning

confidence: 99%

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Chlorophyll fluorescence characteristics, performance and survival of freshly lifted and cold stored Douglas fir seedlings

et al. 2001

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-The physiological condition of three-year-old Douglas fir [Pseudotsuga menziesii (Mirb.) Franco] was periodically assessed from October to May 1998/1999 during propagation of seedlings in an Irish nursery. Seedling physiological status was evaluated in situ using determinations of chlorophyll fluorescence and plant water status. Pre-and post-cold stored (either -2 o C or +0.5 o C) plant vitality was examined using determinations of root growth potential (RGP), root electrolyte leakage (REL), shoot water content and chlorophyll fluorescence. Data obtained from freshly lifted and cold stored stock showed that chlorophyll fluorescence provides a reliable (non-destructive) method of evaluating a seedlings potential field performance in both pre-lift (direct planting) and post-storage (outplanting) situations. Variations in survival and an index of plant health were paralleled by inverse changes in the effective quantum yield of photosystem II (Φ PSII) from November to April. Significant positive non-linear relationships were found between RGP and Φ PSII, though they were of limited predictive ability in terms of outplanting performance. Post-storage fluorescence assessments indicated down-regulation and/or damage of the plants photosynthetic light-harvesting complex, which depended on storage temperature and duration. Ann. For. Sci. 58 (2001) [225][226][227][228][229][230][231][232][233][234][235] 225

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“…Subsequently, each plant was carefully transplanted to a 3-litre prismatic pot and filled with white perlite. The pots were placed randomly in the greenhouse for 21 days under optimal environmental conditions to facilitate their growth (Burdett, 1987;Simpson and Ritchie, 1997). Irrigation was applied daily for root growth, and the air temperature was maintained between 16 and 22°C.…”

Section: Root Growth Potentialmentioning

confidence: 99%

Effects of inoculation with Azospirillum brasilense on the quality of Prosopis juliflora seedlings

et al. 2012

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Inoculation of mycorrhizal fungi and rhizobacteria in plants can improve their growth and physiological status, which could be particularly important for agricultural and forestry plants used for the revegetation of arid areas. Prosopis juliflora is a forest pioneer species that is drought resistant and has multiple uses (fodder, shade and shelter for livestock; timber and firewood, live fences and windbreaks in agroforestry systems). Azospirillum brasilense is a rhizobacterium that improves the growth of many agricultural crops. The hypothesis of this study was that P. juliflora seedlings produced in the nursery can respond positively to inoculation with A. brasilense CECT 590. Five months after inoculation, we examined the growth, water relations (osmotic potential at full turgor, osmotic potential at zero turgor, and the modulus of elasticity at full turgor), and concentration and content of macronutrients (N, P, K, Ca and Mg) in the seedlings. Subsequently, a trial was conducted to analyse root growth potential. A. brasilense CECT 590 inoculation caused an osmotic adjustment in P. juliflora seedlings but decreased the elasticity of the cell walls. Inoculation with A. brasilense CECT 590 significantly improved plant growth due in part to an increase of N concentration in the seedlings. A. brasilense CECT 590 inoculation also caused an increase in the root growth potential. The increased growth of P. juliflora seedlings inoculated with A. brasilense was probably caused by more than one mechanism. Inoculation with A. brasilense at the nursery may be a suitable technique for producing improved seedling material for restoration purposes.Key words: PGPR; osmotic adjustment; elastic adjustment; mineral nutrition; nursery; root growth potential. Resumen La inoculación de Azospirillum brasilense mejora la calidad de las plántulas de un mezquite (Prosopis juliflora)La inoculación de hongos de micorrizacion y rizobacterias en las plantas puede mejorar su crecimiento y calidad fisiológica, especialmente en plantas agrícolas y forestales empleadas para la regeneración de zonas áridas. Prosopis juliflora es una especie forestal pionera, resistente a la sequía, y de usos múltiples (forraje, sombra y cobijo para el ganado, madera y leña, cercas vivas y cortinas cortavientos en sistemas agroforestales). Azospirillum brasilense es una rizobacteria que mejora el crecimiento de muchos cultivos agrícolas. La hipótesis de este estudio fue que las plántulas de P. juliflora producidas en vivero pueden responder positivamente a la inoculación con A. brasilense CECT 590. Cinco meses después desde la inoculación, se analizó el crecimiento, relaciones hídricas (potencial osmótico en saturación, potencial osmótico en el punto de pérdida de turgencia, y módulo de elasticidad a total turgor), concentración y contenido de macronutrientes (N, P, K, Ca y Mg) en las plántulas. Posteriormente se realizó un ensayo para analizar el Potencial de Crecimiento Radical. La inoculación de A. brasilense CECT 590 causó un ajuste osmótico de las ...

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Understanding root growth capacity: theoretical considerations in assessing planting stock quality by means of root growth tests

Cited by 62 publications

References 0 publications

Nursery fertilisation affects the frost-tolerance and plant quality of Eucalyptus globulus Labill. cuttings

Nursery fertilisation affects the frost-tolerance and plant quality of Eucalyptus globulus Labill. cuttings

Chlorophyll fluorescence characteristics, performance and survival of freshly lifted and cold stored Douglas fir seedlings

Effects of inoculation with Azospirillum brasilense on the quality of Prosopis juliflora seedlings

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