Crop responses to drought and the interpretation of adaptation

Blum, A.

doi:10.1007/978-94-017-1299-6_8

Cited by 289 publications

(277 citation statements)

References 74 publications

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“…If dry spells are long and occur during critical stages, the crop can fail (Blum 1996). Our modelling accounts for this important feature of rain-fed agriculture in a simple and pragmatic way, which was discussed with local agronomists (Latiri, personal communication).…”

Section: Wheat Crop Simulationmentioning

confidence: 98%

Potential impact of climate change on durum wheat cropping in Tunisia

Lhomme

Mougou

Mansour³

2009

Climatic Change

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The potential effect of climate change on durum wheat in Tunisia is assessed using a simple crop simulation model and a climate projection for the 2071-2100 period, obtained from the Météo-France ARPEGE-Climate atmospheric model run under the IPCC (International Panel on Climate Change) scenario A1B. In the process-oriented crop model, phenology is estimated through thermal time. Water balance is calculated on a daily basis by means of a simple modelling of actual evapotranspiration involving reference evapotranspiration, crop coefficients and some basic soil characteristics. The impact of crop water deficit on yield is accounted for through the linear crop-water production function developed by the FAO (Food and Agriculture Organization of the United Nations). Two stations are chosen to study the climate change effect. They are representative of the main areas where cereals are grown in Tunisia: Jendouba in the northern region and Kairouan in the central region. In the future scenario, temperature systematically increases, whereas precipitation increases or decreases depending on the location and the period of the year. Mean annual precipitation declines in Jendouba and raises in Kairouan. Under climate change, the water conditions needed for sowing occur earlier and cycle lengths are reduced in both locations. Crop water deficit and the corresponding deficit in crop yield happen to be slightly lower in Kairouan; conversely, they become higher in Jendouba. J. P. Lhomme (B) IRD (UR060), CEFE-CNRS, 1919 route de Mende,

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Section: Wheat Crop Simulationmentioning

confidence: 98%

Potential impact of climate change on durum wheat cropping in Tunisia

Lhomme

Mougou

Mansour³

2009

Climatic Change

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“…Seed germination and early seedling growth are considered to be the most critical stages for wheat establishment, especially under stress (Blum 1996). In continental climate environments, autumn-sown wheat frequently experiences early season drought stress.…”

Section: Introductionmentioning

confidence: 99%

Molecular mapping of genomic regions associated with wheat seedling growth under osmotic stress

Landjeva¹,

Neumann²,

Lohwasser³

et al. 2008

Biologia plant.

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A quantitative trait loci (QTL) approach was applied to dissect the genetic control of the common wheat seedling response to osmotic stress. A set of 114 recombinant inbred lines was subjected to osmotic stress from the onset of germination to the 8 th day of seedling development, induced by the presence of 12 % polyethylene glycol. Root, coleoptile and shoot length, and root/shoot length ratio were compared under stress and control conditions. In all, 35 QTL mapping to ten chromosomes, were identified. Sixteen QTL were detected in controls, 17 under stressed conditions, and two tolerance index QTL were determined. The majority of the QTL were not stress-specific. In regions on five chromosome arms (1AS, 1BL, 2DS, 5BL and 6BL) the QTL identified under stress co-mapped with QTL affecting the same trait in controls, and these were classified as seedling vigour QTL, in addition to those expressed in controls. Tolerance-related QTL were detected on four chromosome arms. A broad region on chromosome 1AL, including five QTL, with a major impact of the gene Glu-A1 (LOD 3.93) and marker locus Xksuh9d (LOD 2.91), positively affected root length under stress and tolerance index for root length, respectively. A major QTL (LOD 3.60), associated with marker locus Xcdo456a (distal part of chromosome arm 2BS) determined a tolerance index for shoot length. Three minor QTL (LOD < 3.0) for root length and root/shoot length ratio under osmotic stress were identified in the distal parts of chromosome arms 6DL (marker locus Xksud27a) and 7DL (marker locus Xksue3b). Selecting for the favourable alleles at marker loci associated with the detected QTL for growth traits may represent an efficient approach to enhance the plants' ability to maintain the growth of roots, coleoptile and shoots in drought-prone soils at the critical early developmental stages.

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“…Water stress limits grain yield in many crops including cereals (Blum 1996;Iqbal et al 2005). Like other cereals barley is also affected by water stress and intense stress at any developmental stage significantly reduces its grain yield (Urchei and Rodrigues 1994).…”

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confidence: 97%

Indole acetic acid (IAA) induced changes in growth, relative water contents and gas exchange attributes of barley (Hordeum vulgare L.) grown under water stress conditions

2006

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Effect of different concentrations of indole acetic acid (IAA) under varying soil water deficit conditions on two barley cultivars viz. B-99094 and Jau-87 was investigated in soil filled earthen pots. There were six treatments including control each with four replicates. Three concentrations of IAA (0, 15 and 30 mg l -1 ) were applied as foliar spray 30 days after germination. After hormone application, half of the pots were subjected to one cycle of water stress (withholding of water till incipient wilting), followed by regular watering. Plant height, photosynthetic rate, transpiration rate, stomatal conductance, water use efficiency relative water content, dry biomass, and grain yield/plant were significantly reduced by water stress. However, IAA treatments alleviated the adverse effect of water stress and successful in enhancing the plant growth and yield of barley cultivars. Barley cultivar Jau-87 performed better than B-99094. IAA application was effective in enhancing growth and photosynthetic efficiency of barley both under normal and water stress conditions.

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Crop responses to drought and the interpretation of adaptation

Cited by 289 publications

References 74 publications

Potential impact of climate change on durum wheat cropping in Tunisia

Potential impact of climate change on durum wheat cropping in Tunisia

Molecular mapping of genomic regions associated with wheat seedling growth under osmotic stress

Indole acetic acid (IAA) induced changes in growth, relative water contents and gas exchange attributes of barley (Hordeum vulgare L.) grown under water stress conditions

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