Approche à l'échelle du système racinaire de l'absorption hydro-minérale. Conséquences en matière de modélisation

Habib, Robert H.; Pagès, Loïc; Jordan, MO; Simonneau, Thierry; Sébillotte, Michel

doi:10.1051/agro:19910801

Cited by 20 publications

(7 citation statements)

References 24 publications

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“…The first considered that water uptake took place uniformly along the entire root axis, from tip to base. This assumption was doubtless very simplistic, but very conventional (Atkinson 1986;Habib et al 1991;Tardieu 1988;Taylor and Klepper 1978). However, it seemed acceptable for this study based on varietal comparison.…”

Section: Discussionmentioning

confidence: 97%

Genotypic variability of oil palm root system distribution in the field. Consequences for water uptake

et al. 2011

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Previous studies relating root systems and drought tolerance in oil palm focused mainly on biomass. Yet, total root length (TRL), total root surface area (TRS), and root distribution in the soil better determine water uptake. These morphological traits were studied on 3 oil palm genotypes displaying a contrasting drought tolerance. A new concept of potential root water extraction ratio (PRER) was developed using measured half-distances between roots and some assumptions about the distance of water migration from soil to root. PRER was determined in conjunction with soil moisture extraction efficiency (SMEE). The presumed tolerant genotype (T) had higher TRL, TRS and PRER than the susceptible genotype (S), whilst the performance of the control genotype (I) was intermediate. Surprisingly, during a period of moderate water deficit, T had a lower SMEE than S, which was interpreted successfully with PRER, as the result of a better access to a large volume of soil and of a slower drying out of the soil around the roots. PRER appears as a helpful indicator for comparing or ranking genotypes, and for addressing better the complexity of the genetic variability of drought tolerance. (Résumé d'auteur

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Section: Discussionmentioning

confidence: 97%

Genotypic variability of oil palm root system distribution in the field. Consequences for water uptake

et al. 2011

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“…The kinetic parameters of mineral and water absorption and growth are neither constant nor homogeneous within the root system (Habib et al, 1991). Moreover, the role of the root system in absorption also varies widely depending on the physiological status of the plant.…”

Section: Root Traits and Stress Tolerancementioning

confidence: 99%

Effects of osmotic and water stresses on root and shoot morphology and seed yield in sunflower (Helianthus annuus L) genotypes bred for Morocco or issued from introgression with H. argophyllus T. & G.

Midaoui¹,

Serieys²,

Griveau³

et al. 2003

Helia

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The effect of osmotic and water stresses on various morphological traits was studied in eight experimental varieties of sunflower bred for Moroccan conditions or issued from interspecific hybridization with H.argophyllus or H.debilis. Seed yield of the same genotypes was also evaluated under rainfed and irrigated field conditions. Shoot and root growth were significantly reduced by osmotic stress (-0.6 and -1.0 MPa) induced with polyethylene glycol (PEG 6000). Considerable genotype variation was expressed for all traits. Significant genotype by stress interaction was observed for root dry weight and volume as well as seed yield. The morphological traits were not related to seed yield in the correlation and principal component analyses. Four genotypes issued from introgression with H.argophyllus were grouped and distinct from other genotypes according to hierarchical ascending classification. One genotype issued from introgression with H.debilis and three non-introgressed sunflower varieties were found to be very distinct from each other and from those introgressed with H.argophyllus.

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“…Many recent works have emphasised the need to describe the root system architecture to provide a basis for improved understanding of the uptake of water and minerals (Clarkson, 1991;Fitter, 1991;Habib et al, 1991). A better knowledge of the structure of the root system is necessary because of the diversity in root functioning (Waisel and Eshel, 1991), and because of the diversity in their morphogenetic capacities (Fitter, 199 l;Waisel and Eshel, 1991).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of parameters describing the root system architecture of field grown maize plants (Zea mays L.)

Pagès

Pellerin

1994

Plant Soil

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The architecture of the root system is related to its water and mineral uptake. In this paper, the number, growth, and branching of first-order lateral roots are studied on field grown maize (early maturing cultivar 'Dea'), mainly in relation to the depth and to the rank of the bearing phytomer. The soil was a deep clay loam, without any barrier until 1.80 m.The branching density was studied along axile roots until 1.40 m from the base, on a sample of individually excavated axile roots. A strong gradient of density was shown: the mean branching density decreased from 12 roots.cm -~ near the base to 4 roots.cm -l at a 60 cm depth. Seminal roots were less densely branched than nodal roots. The mean difference was about 4 roots.cm-~.The length and branching density of lateral roots were studied on mature parts of the root systems where the growth and branching of the laterals were completed, using samples extracted from large soil monoliths. The length distribution of lateral roots was highly asymmetrical, for every source phytomer (mean: 25 mm; median: 16 mm). Many lateral roots were very short, and only 2 % reached a length higher than 10 cm. Only 29 % of all the laterals bore second-order lateral roots. Vigorous laterals branched more systematically and more profusely: the branching density varied from 2 to 5 roots.cm-J according to the length of the mother lateral root. Both the number and length of lateral roots appeared to be affected by the soil bulk density which varied with the depth.

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Approche à l'échelle du système racinaire de l'absorption hydro-minérale. Conséquences en matière de modélisation

Cited by 20 publications

References 24 publications

Genotypic variability of oil palm root system distribution in the field. Consequences for water uptake

Genotypic variability of oil palm root system distribution in the field. Consequences for water uptake

Effects of osmotic and water stresses on root and shoot morphology and seed yield in sunflower (Helianthus annuus L) genotypes bred for Morocco or issued from introgression with H. argophyllus T. & G.

Evaluation of parameters describing the root system architecture of field grown maize plants (Zea mays L.)

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