Acclimation to long-term water deficit in the leaves of two sunflower hybrids: photosynthesis, electron transport and carbon metabolism

Panković, Dejana; Sakač, Zvonimir; Kevrešan, Slavko; Plesničar, Marijana

doi:10.1093/jxb/50.330.128

Cited by 65 publications

(49 citation statements)

References 36 publications

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“…The effect of drought stress on photosynthesis due to stomatal and non-stomatal factors has been widely studied. The decline in gas exchange characteristics in different plant species with increase in intensity of water stress was observed in many studies (Giminez et al 1992, Ashraf and O'Leary 1996, Pankovic et al 1999. It is also reported that sunflower lines show differential response to drought stress regarding gas exchange characteristics.…”

Section: Introductionmentioning

confidence: 78%

Influence of Exogenous Glycine Betaine on Gas Exchange and Biomass Production in Sunflower (Helianthus annuus L.) under Water Limited Conditions

Iqbal

Ashraf

2009

J Agronomy Crop Science

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This study investigated whether the exogenous application of glycine betaine (GB) could alleviate the adverse effects of water deficit on sunflower. Two sunflower lines, Gulshan‐98 and Suncross, were subjected to water deficit at the vegetative or the reproductive stages of plant growth. Three levels (0, 50 and 100 mmol l−1) of GB were applied as a pre‐sowing seed treatment or as a foliar spray at the time of initiation of water deficit at the vegetative or reproductive stages. Foliar application of GB at the time of initiation of water deficit treatments showed a marginal increase in shoot biomass in drought‐stressed plants. Exogenously supplied GB as a foliar spray also showed a positive role in reducing the effects of water deficit on net CO2 assimilation rate, transpiration rate and sub‐stomatal CO2 concentration in both sunflower lines. Pre‐sowing seed treatment with GB had no effects on the above‐mentioned physiological and growth attributes in both normally irrigated and drought‐stressed plants. Taken together, foliar application of GB increased net CO2 assimilation rate which in turn showed a slight increase in growth of water‐stressed plants but this increase was not related to stomatal regulation.

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Section: Introductionmentioning

confidence: 78%

Influence of Exogenous Glycine Betaine on Gas Exchange and Biomass Production in Sunflower (Helianthus annuus L.) under Water Limited Conditions

Iqbal

Ashraf

2009

J Agronomy Crop Science

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“…Previous studies have found that several factors affect the reduction in photosynthesis because of environmental stresses (Pankovic et al 1999). These include light, ambient CO 2 concentration and temperature (Taiz and Zeiger 2002).…”

Section: Discussionmentioning

confidence: 99%

Chlorophyll Stability is an Indicator of Drought Tolerance in Peanut

Arunyanark

Jogloy

Akkasaeng

et al. 2008

J Agronomy Crop Science

162

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Chlorophyll stability during drought might be a promising criterion for selection for drought resistance in peanut. The study describes two field trials conducted at Khon Kaen University, Thailand which investigate genotype × drought interactions in a wide range of peanut germplasm in general and assess the relationship between chlorophyll stability and genotypic performance in particular, under drought. Two field experiments (during 2003/2004 and 2004/2005 dry seasons) were conducted in a split plot design with three water regimes [field capacity, 2/3 available water (AW) and 1/3 AW] as main, and 12 peanut genotypes as subtreatments, replicated four times. Observations on total dry matter (TDM), chlorophyll density (ChlD) (chlorophyll content per unit leaf area), chlorophyll content (chlorophyll content per plant) and SPAD chlorophyll meter readings (SCMR) were recorded at 30, 60 and 90 days after emergence. Transpiration (T) and transpiration efficiency (TE) were computed using the data on amount of water input and TDM. Drought stress significantly reduced TDM, T and chlorophyll content across genotypes but significantly increased TE and ChlD in peanut. However, there were significant differences among genotypes for TE and chlorophyll parameters. The genotype × drought interaction effects for chlorophyll characters (content and density) were not significant suggesting a strong genetic effect. The correlation coefficients between TDM and chlorophyll content (r = 0.51, P = 0.01 to r = 0.91, P = 0.01) and between TE and ChlD (r = 0.46, P = 0.05 to r = 0.77, P = 0.01) were positive and significant. These findings suggest that chlorophyll parameters are strongly linked with drought tolerance in peanut. There were highly significant and positive relationships between ChlD and SCMR (r = 0.67, P = 0.01 to r = 0.93, P = 0.01), between SCMR and TE (r = 0.41, P = 0.05 to r = 0.80, P = 0.01) suggesting that SCMR could be used as a tool for rapid assessment of relative chlorophyll status in peanut genotypes as well as for the indirect selection of drought tolerance in peanut.

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“…Reduced transpiration inevitably limits access to CO 2 . Carbon limitation leading to a decreased use of reduction equivalents and of the proton gradient of the photosynthetic light reactions can be seen as the main factor that drives the long-term drought responses of plants (Jefferies 1994;Panković et al 1999;Flexas et al 2006;Kohzuma et al 2009).…”

Section: Introductionmentioning

confidence: 99%

The drought response of potato reference cultivars with contrasting tolerance

Sprenger

Kurowsky

Horn

et al. 2016

Plant Cell & Environment

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Systems responses to drought stress of four potato reference cultivars with differential drought tolerance (Solanum tuberosum L.) were investigated by metabolome profiling and RNA sequencing. Systems analysis was based on independent field and greenhouse trials. Robust differential drought responses across all cultivars under both conditions comprised changes of proline, raffinose, galactinol, arabitol, arabinonic acid, chlorogenic acid and 102 transcript levels. The encoded genes contained a high proportion of heat shock proteins and proteins with signalling or regulatory functions, for example, a homolog of abscisic acid receptor PYL4. Constitutive differences of the tolerant compared with the sensitive cultivars included arbutin, octopamine, ribitol and 248 transcripts. The gene products of many of these transcripts were pathogen response related, such as receptor kinases, or regulatory proteins, for example, a homolog of the Arabidopsis FOUR LIPS MYB-regulator of stomatal cell proliferation. Functional enrichment analyses imply heat stress as a major acclimation component of potato leaves to long-term drought stress. Enhanced heat stress during drought can be caused by loss of transpiration cooling. This effect and CO limitation are the main consequences of drought-induced or abscisic acid-induced stomatal closure. Constitutive differences in metabolite and transcript levels between tolerant and sensitive cultivars indicate interactions of drought tolerance and pathogen resistance in potato.

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Acclimation to long-term water deficit in the leaves of two sunflower hybrids: photosynthesis, electron transport and carbon metabolism

Cited by 65 publications

References 36 publications

Influence of Exogenous Glycine Betaine on Gas Exchange and Biomass Production in Sunflower (Helianthus annuus L.) under Water Limited Conditions

Influence of Exogenous Glycine Betaine on Gas Exchange and Biomass Production in Sunflower (Helianthus annuus L.) under Water Limited Conditions

Chlorophyll Stability is an Indicator of Drought Tolerance in Peanut

The drought response of potato reference cultivars with contrasting tolerance

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