Upland rice grown in soil-filled chambers and exposed to contrasting water-deficit regimes

Price, Adam H.; Steele, Katherine A.; Gorham, J.; Bridges, Joe; Moore, B. J.; Evans, J.; Richardson, Paul L.; Jones, R. G. Wyn

doi:10.1016/s0378-4290(02)00012-6

Cited by 108 publications

(63 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Still, there are only few examples where root traits have been targeted in breeding programs. Systematic breeding efforts for root system properties have been done mainly for rice (Price et al 2002;Kato et al 2006;Farooq et al 2009a) and chickpea (Kashiwagi et al 2005;Gaur et al 2008). For wheat, physiological and root research studies evidence the significant contribution of roots to higher drought resistance (e.g.…”

Section: Breeding For Dehydration Avoidancementioning

confidence: 99%

Management of crop water under drought: a review

Bodner

Nakhforoosh

Kaul

2015

Agron. Sustain. Dev.

401

234

View full text Add to dashboard Cite

Drought is a predominant cause of low yields worldwide. There is an urgent need for more water efficient cropping systems facing large water consumption of irrigated agriculture and high unproductive losses via runoff and evaporation. Identification of yield-limiting constraints in the plant-soil-atmosphere continuum are the key to improved management of plant water stress. Crop ecology provides a systematic approach for this purpose integrating soil hydrology and plant physiology into the context of crop production. We review main climate, soil and plant properties and processes that determine yield in different water-limited environments. From this analysis, management measures for cropping systems under specific drought conditions are derived. Major findings from literature analysis are as follows. (1) Unproductive water losses such as evaporation and runoff increase from continental in-season rainfall climates to storage-dependent winter rainfall climates. Highest losses occur under tropical residual moisture regimes with short intense rainy season. (2) Sites with a climatic dry season require adaptation via phenology and water saving to ensure stable yields. Intermittent droughts can be buffered via the root system, which is still largely underutilised for better stress resistance. (3) At short-term better management options such as mulching and date of seeding allow to adjust cropping systems to site constraints. Adapted cultivars can improve the synchronisation between crop water demand and soil supply. At long term, soil hydraulic and plant physiological constraints can be overcome by changing tillage systems and breeding new varieties with higher stress resistance. (4) Interactions between plant and soil, particularly in the rhizosphere, are a way towards better crop water supply. Targeted management of such plant-soil interactions is still at infancy.We conclude that understanding site-specific stress hydrology is imperative to select the most efficient measures to mitigate stress. Major progress in future can be expected from crop ecology focussing on the management of complex plant (root)-soil interactions.

show abstract

Section: Breeding For Dehydration Avoidancementioning

confidence: 99%

Management of crop water under drought: a review

Bodner

Nakhforoosh

Kaul

2015

Agron. Sustain. Dev.

401

234

View full text Add to dashboard Cite

show abstract

“…root architecture, which is not possible to quantify in narrower root boxes used previously (Hurd 1968;O'Brien 1979). Further, in contrast to other root studies using either small root chambers positioned at a 45 • angle (Kuchenbuch and Ingram 2002;Price et al 2002) or larger root boxes with a sloping glass face (Hurd 1968;O'Brien 1979), the root chambers in this study were designed with vertical Perspex sides, so that roots did not grow preferentially towards the transparent surface, as demonstrated in Fig. 5.…”

Section: Root Observation Chambersmentioning

confidence: 99%

“…Desirable root traits that are usually expressed at later stages of crop development, such as greater distribution of roots at depth and uniform root branching pattern, appear to be less suitable for large-scale, cost-effective screening programs, unless they can be reliably linked with surrogate measures such as canopy temperature (Fischer et al 1998;Reynolds et al 1999). In addition, root characteristics exhibit a high degree of phenotypic plasticity in response to temporal and spatial variation in rooting environment (Poorter and Nagel 2000;Fitter 2002), which complicates the identification of genotypic variation in drought-adaptive root traits (Price et al 2002). Therefore, for root traits to be useful as secondary selection criteria in wheat improvement programs, they should ideally be expressed at an early stage and determine the growth and functioning of the root system later in the season.…”

Section: Selecting For Desirable Root Traitsmentioning

confidence: 99%

The role of root architectural traits in adaptation of wheat to water-limited environments

Manschadi¹,

Christopher²,

deVoil³

et al. 2006

Functional Plant Biol.

543

457

View full text Add to dashboard Cite

Abstract. Better understanding of root system structure and function is critical to crop improvement in waterlimited environments. The aims of this study were to examine root system characteristics of two wheat genotypes contrasting in tolerance to water limitation and to assess the functional implications on adaptation to water-limited environments of any differences found. The drought tolerant barley variety, Mackay, was also included to allow inter-species comparison. Single plants were grown in large, soil-filled root-observation chambers. Root growth was monitored by digital imaging and water extraction was measured. Root architecture differed markedly among the genotypes. The drought-tolerant wheat (cv. SeriM82) had a compact root system, while roots of barley cv. Mackay occupied the largest soil volume. Relative to the standard wheat variety (Hartog), SeriM82 had a more uniform rooting pattern and greater root length at depth. Despite the more compact root architecture of SeriM82, total water extracted did not differ between wheat genotypes. To quantify the value of these adaptive traits, a simulation analysis was conducted with the cropping system model APSIM, for a wide range of environments in southern Queensland, Australia. The analysis indicated a mean relative yield benefit of 14.5% in water-deficit seasons. Each additional millimetre of water extracted during grain filling generated an extra 55 kg ha −1 of grain yield. The functional implications of root traits on temporal patterns and total amount of water capture, and their importance in crop adaptation to specific water-limited environments, are discussed.

show abstract

“…These traits collectively determine the root's three-dimensional body plan, where specific shapes can provide advantages in certain environments [4]. For example, deeper primary roots are often associated with plants with a greater tolerance to drought [5], [6]. The dynamic and patchy nature of the soil environment also appears to make the post-embryonic adjustment of the body plan a valuable attribute.…”

Section: Introductionmentioning

confidence: 99%

Plasticity Regulators Modulate Specific Root Traits in Discrete Nitrogen Environments

et al. 2013

View full text Add to dashboard Cite

Plant development is remarkably plastic but how precisely can the plant customize its form to specific environments? When the plant adjusts its development to different environments, related traits can change in a coordinated fashion, such that two traits co-vary across many genotypes. Alternatively, traits can vary independently, such that a change in one trait has little predictive value for the change in a second trait. To characterize such “tunability” in developmental plasticity, we carried out a detailed phenotypic characterization of complex root traits among 96 accessions of the model Arabidopsis thaliana in two nitrogen environments. The results revealed a surprising level of independence in the control of traits to environment – a highly tunable form of plasticity. We mapped genetic architecture of plasticity using genome-wide association studies and further used gene expression analysis to narrow down gene candidates in mapped regions. Mutants in genes implicated by association and expression analysis showed precise defects in the predicted traits in the predicted environment, corroborating the independent control of plasticity traits. The overall results suggest that there is a pool of genetic variability in plants that controls traits in specific environments, with opportunity to tune crop plants to a given environment.

show abstract

Upland rice grown in soil-filled chambers and exposed to contrasting water-deficit regimes

Cited by 108 publications

References 13 publications

Management of crop water under drought: a review

Management of crop water under drought: a review

The role of root architectural traits in adaptation of wheat to water-limited environments

Plasticity Regulators Modulate Specific Root Traits in Discrete Nitrogen Environments

Contact Info

Product

Resources

About