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Comparative osmotic adjustments in barley and tetraploid wheats (1997)

Teulat1, B. ; Rekika, D. ; Nachit, M. M. ; [et al.]

Oxford, UK : Blackwell Publishing Ltd

Plant breeding 116 (1997), S. 0

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ISSN: 1439-0523

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition

Notes: Five barley (Hordeum rulgare L.), five durum wheat (Triticum turgidum concar. durum L.) and one wild emmer wheat (Triticum turgidum conrar dicoccoides) genotypes from different origins and differing for drought tolerance and potential yield, were studied for their osmotic adjustment capacity at the same stage and under similar water stress conditions. Differences for water status parameters between barley and tetraploid wheat genotypes were noted and discussed. The lowest osmotic adjustment capacities were noted in drought susceptible varieties, while a high capacity was found in genotypes exhibiting a high yield stability across contrasting environments. Relative water content, leaf osmotic potential and accumulation of soluble sugars were found to be highly related with osmotic adjustment: they could be used as criteria for a rapid evaluation of osmotic adjustment in segregating populations.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1439-0523.1997.tb02183.x

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Effects of water deficit on photosynthetic rate and osmotic adjustment in tetraploid wheats (1998)

Rekika, D. ; Nachit, M.M. ; Araus, J.L. ; [et al.]

Springer

Photosynthetica 35 (1998), S. 129-138

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ISSN: 1573-9058

Keywords: drought tolerance ; durum wheat ; intercellular CO2 concentration ; leaf water status ; Triticum ; water stress ; wild emmer wheat

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Notes: Abstract Osmotic adjustment, accumulation of soluble saccharides, and photosynthetic gas exchange were studied in five durum wheat (Triticum turgidum L. var. durum) and one wild emmer wheat (Triticum turgidum L. var. dicoccoïdes) cultivars of contrasting drought tolerance and yield stability. Soil water contents (SWC) were 100, 31, 20, and 12 % of maximum capillary capacity. Under mild water stress (SWC 31 to 20 %), osmotic adjustment capacity and high accumulation of saccharides were found in cv. Cham1, a high yielding and drought tolerant cultivar, and in var. dicoccoïdes, while lowest values were noted in the durum wheat landraces Oued-Zenati and Jennah-Khotifa. Under more severe water stress (SWC 12 %), the cv. Cham1 maintained higher net photosynthetic rate (PN) than other genotypes. The observed changes in the ratio intercellular/ambient CO2 concentration (ci/ca) indicated that under mild and severe water stress, the decrease in PN was mainly due to stomatal and non-stomatal factors, respectively.