Flag leaf senescence, carbon content and carbon isotope discrimination in durum wheat grown under semi-arid conditions

Hafsi, M.; Pfeiffer, Wolfgang; Monneveux, Philippe

doi:10.1007/bf03543263

Cited by 15 publications

(10 citation statements)

References 13 publications

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“…The lack of correlation between Δ values and grain yield is in agreement with earlier findings from Hafsi et al (2003) and Araus et al (2003) and is likely to be due to a strong contribution of pre-anthesis assimilates to yield together with a sink limitation of yield, breaking the association observed between ∆ and yield under post-anthesis water stress by several authors Merah et al, 2001b;Monneveux et al, 2005). Heading stage coincided with strong drought and frost (particularly in the first season) that strongly reduced potential grain number.…”

Section: Relationship Between Grain Yield Senescence and Carbon Isotsupporting

confidence: 90%

Leaf senescence and carbon isotope discrimination in durum wheat (Triticum durumDesf.) under severe drought conditions

Hafsi¹,

Akhter²,

Monneveux³

2007

Cereal Research Communications

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Les relations entre la senescence foliaire, la discrimination isotopique du carbone et la performance du rendement, sont examinées chez le Blé dur (Triticum durum Desf.), au niveau des hautes plaines sétifiennes. Dix variétés de Blé dur à haut potentiel ont été conduits durant deux saisons agricoles successives caractérisées par une faible pluviométrie (217 et 162 mm, respectivement), des températures gélives au stade épiaison et un stress thermique en fin de cycle. La sénescence a été évaluée par le traitement numérique de l'image (NIA). La discrimination isotopique du carbone de la feuille drapeau a été analysée pour les différentes variétés aux stades anthèse et maturité du grain respectivement. La sénescence a été corrélée significativement et négativement au rendement grain pour la première saison mais pas pour la deuxième. Il n'y a pas eu de relations significatives entre Δ et le rendement pour les deux saisons. L'absence d'association entre Δ (la discrimination isotopique du carbone) et le rendement grain est probablement dû à une forte contribution des assimilats au rendement au stade pré-anthèse avec une limitation du puits (fertilité de l'épi).Mots clés : discrimination isotopique du carbone, sécheresse, sénescence, blé dur (Triticum durum Desf.) Abstract:The relationships between leaf senescence, carbon isotope discrimination and yield performance were examined in durum wheat (Triticum durum Desf.), in the high plains of Setif, eastern Algeria. Ten CIMMYT highyielding cultivars were grown during two cropping seasons characterized by low rainfall (217 and 162 mm, respectively), freezing temperatures at heading stage and terminal heat stress. Senescence was assessed using numerical image analysis (NIA). Carbon isotope discrimination was analyzed in flag leaves at anthesis and grain at maturity. Senescence was significantly negatively correlated to grain yield in season 1, but not in season 2. There was no relationship between Δ and grain yield in both seasons. The absence of association between Δ and grain yield is likely to be due a strong contribution of pre-anthesis assimilates to yield together with a sink limitation of yield.

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Section: Relationship Between Grain Yield Senescence and Carbon Isotsupporting

confidence: 90%

Leaf senescence and carbon isotope discrimination in durum wheat (Triticum durumDesf.) under severe drought conditions

Hafsi¹,

Akhter²,

Monneveux³

2007

Cereal Research Communications

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“…Also Hafsi et al. () did not observe a significant correlation between grain yield and ∆ under semi‐arid conditions with PASW levels similar to the present study.…”

Section: Discussionsupporting

confidence: 88%

“…) and some authors did not find a significant relationship between the two traits (Hafsi et al. , ). Under drought stress conditions, however, ∆ was mostly positive related with grain yield (Merah , Monneveux et al.…”

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confidence: 96%

Suitability of carbon isotope discrimination, ash content and single mineral concentration for the selection of drought‐tolerant winter rye

Kottmann

Schittenhelm

Giesemann³

2014

Plant Breeding

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Carbon isotope discrimination (Δ) has been proposed as selection criterion for grain yield under dry conditions, and ash content (m a ) and mineral concentration were suggested as surrogates for Δ. In this study, the relationship between grain yield, Δ, m a and mineral concentration (Si, Ca, K, Mg) was examined in 2011 and 2012 on 16 winter rye genotypes grown under severe drought, mild drought (2012 only) and well-watered conditions. Analyses were performed on mature flag leaves and grains. Highly significant differences between water regimes occurred for all measured traits. Δ, m a and mineral concentrations were significantly correlated with grain yield under severe drought in 2011, but not in 2012 except for Δ in flag leaf. Δ was related to m a and mineral concentrations. Although the correlations were quite inconsistent, the results indicate that the measured traits can potentially be used as selection criterion for drought tolerance in rye. For a final statement about the suitability of these traits in rye breeding, the results should be secured with a larger and more diverse set of genotypes.

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“…The lack of correlation between D and yield in Guyuan in year 2 could also be related to the very severe stress having occurred in this environment. Araus et al (1998) in Spain and Hafsi et al (2003) in Algeria showed that, even under Mediterranean environments, severe stress can be associated to a lack of association between grain yield and D. Severe drought conditions that affect flowering and grain formation can drastically reduce sink size and break the relationship between stomatal conductance (and D) and grain yield (Hafsi et al 2003). The association between DG m and grain yield was not significant under wellirrigated conditions (Yinchuan, year 1), in full agreement with Monneveux et al (2004aMonneveux et al ( , 2005 and Misra et al (2006).…”

Section: Relationship Between Grain Yield and D Across And Within Envmentioning

confidence: 98%

Relationship between Carbon Isotope Discrimination and Grain Yield in Spring Wheat under Different Water Regimes and under Saline Conditions in the Ningxia Province (North‐west China)

Xu¹,

Yuan²,

Li³

et al. 2007

J Agronomy Crop Science

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The relationship between grain yield and carbon isotope discrimination (Δ) was analysed in wheat grown under different water regimes in the Ningxia Province (north‐west of China). When the association was significant, the relationships between grain yield, Δ and other drought tolerance related traits, such as leaf ash content (ma), chlorophyll concentration (Chl), relative water content (RWC), stomatal conductance (gS) and the ratio of internal CO2 leaf concentration to ambient CO2 concentration (Ci/Ca), were also examined. Using correlation analysis, the relationships were determined during two consecutive years in a set of 20 spring wheat cultivars (landraces, improved varieties and advanced lines) under rainfed and irrigated conditions, including saline conditions. The relationship between Δ and yield within environments highly depended on the quantity of water stored in the soil at sowing, the quantity and distribution of rainfall during the growth cycle, and the irrigation before anthesis. Δ predicted grain yield under limited irrigation (post‐anthesis water stress) but not under pre‐anthesis water stress (rainfed conditions), fully irrigated and saline conditions. Under limited irrigation, grain Δ correlated significantly to grain yield leaf ma at heading and maturity. It also significantly positively correlated to Chl, RWC, gS and Ci/Ca assessed at anthesis. A precise characterization of the timing and intensity of the abiotic constraints experienced by the crop is consequently needed before implementing the use of Δ in wheat breeding programmes.

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Flag leaf senescence, carbon content and carbon isotope discrimination in durum wheat grown under semi-arid conditions

Cited by 15 publications

References 13 publications

Leaf senescence and carbon isotope discrimination in durum wheat (Triticum durumDesf.) under severe drought conditions

Leaf senescence and carbon isotope discrimination in durum wheat (Triticum durumDesf.) under severe drought conditions

Suitability of carbon isotope discrimination, ash content and single mineral concentration for the selection of drought‐tolerant winter rye

Relationship between Carbon Isotope Discrimination and Grain Yield in Spring Wheat under Different Water Regimes and under Saline Conditions in the Ningxia Province (North‐west China)

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