Variation in drought susceptibility among closely related wheat lines

Lazar, M. D.; Salisbury, Clay D.; Worrall, W. D.

doi:10.1016/0378-4290(95)00015-i

Cited by 31 publications

(23 citation statements)

References 12 publications

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“…Similar trends were reported for the repressing effects of drought on plant growth and grain yield (Gallagher et al 1975;Keim and Kronstad 1981;Ehdaie et al 1991;Lazar et al 1995;Van den Boogaard et al 1996;Van Ginkel et al 1998), on grain growth and development (Ehdaie et al 2008), and on root and shoot traits (Ehdaie et al 2003). In this study, reduction in shoot biomass including grain yield was more than the reduction in root biomass indicating that under drought stress relatively more assimilates are transported to roots for development of a more vigorous root system required for water and nutrient uptake.…”

Section: Discussionsupporting

confidence: 89%

Root system plasticity to drought influences grain yield in bread wheat

2011

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Crop productivity in semiarid regions is mainly limited by water availability. Root characteristics and plasticity to drought may reduce the negative impact of drought on crop yield. A set of near-isogenic wheat-rye translocation lines was used to test the hypothesis that root system plasticity to drought influences grain yield in wheat. Bread wheat Pavon 76 and 1RS translocation lines, namely Pavon 1RS.1AL, Pavon 1RS.1BL, and Pavon 1RS.1DL were evaluated for root allocation and plasticity in sandtube experiments under well-watered and droughted conditions across 2 years using factorial treatments in a randomized complete block design with four replicates. The 1RS translocation lines had greater root biomass per plant ranging from 7.37 to 8.6 compared to 5.81 g for Pavon 76. Only Pavon 76 showed a positive response to drought by producing more shallow roots (roots developed between 0 and 30 cm) and deep roots (roots developed below 30 cm) in droughted conditions than in well-watered conditions. Thus at drought intensity of 19% (measured as overall reduction in grain yield), grain yield in Pavon 76 was reduced only by 11% compared to the other genotypes with yield reductions ranging from 18 to 24%. However, at drought intensity of 36%, grain yield in Pavon 76 showed maximum reduction indicating that greater root production under drought is advantageous only when plant-available water is enough to support grain production. Grain yield was positively correlated with shallow and deep root weight and root biomass under terminal drought. Correlation coefficients between root system components (shallow and deep root weight and root biomass) and phenological periods were not significant. Our study indicated that genes influencing adaptive phenotypic plasticity of the root system to drought in Pavon 76 are located on chromosome 1BS.

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Section: Discussionsupporting

confidence: 89%

Root system plasticity to drought influences grain yield in bread wheat

2011

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“…Varietal differences in osmotic adjustment in wheat and other cereal crops have been observed by a number of researchers as well (Morgan, 1977;Shonfeld et al, 1988). Similar findings have been reported by Lazar et al (1995). They exploited the variation among closely related drought susceptible lines and were not able to find any correlation between certain developmental variables (anthesis date, physiological maturity, etc.)…”

Section: Drought Tolerant Mechanismssupporting

confidence: 73%

Breeding for drought tolerance in wheat (Triticum aestivum L.): constraints and future prospects

Khan

Iqbal

2010

Front. Agric. China

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This review article is based on different aspects of wheat breeding for drought tolerance. Drought is regarded as one of the most serious threats to agriculture in Pakistan. Therefore, breeding for drought tolerance must be given top priority. Here, we try to study various options available to wheat breeders exploring the underlying mechanisms of drought tolerance. The progress made in conventional and non-conventional (molecular) based approaches with potential findings and constraints are reviewed in this article. Equipped with such information, it will be possible for breeders to further explore the mysteries of drought tolerance and to select genotypes with an improved yield under water-deficit conditions.

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“…Under our experimental conditions, genotype had no significant main effect on grain mass but the inoculation ( genotype interaction was significant at P=0.007, with TX86A8072 producing 3.05 g and TX86A5606 only 2.59 g grains per plant in inoculated plants (SE=0.304). These marginal differences, obtained from potted plants grown under glass house conditions, contrast field data that show pronounced and consistent differences in stress response (Lazar et al, 1995).…”

Section: Physiological Measurementsmentioning

confidence: 86%

“…Two wheat BC3-generation sister lines, TX86A 5606 and TX86A8072, were identified as drought sensitive and tolerant respectively based on dryland and irrigated grain yields (Lazar et al, 1995). Average grain production during 1992À2000 in dryland, under precipitation usually less than 200 mm during wheat vegetation, was 2470 kg/ha for TX86A8072 and 1985 kg/ha for TX86A5606 (M.D.…”

Section: Plant Materials and Growth Conditionsmentioning

confidence: 99%

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The effect of take-all disease on gas-exchange rates and biomass in two winter wheat lines with different drought response

et al. 2005

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There have been no studies of the effect of take-all on leaf gas-exchange rates, despite the fact that take-all severely restricts plant water and nutrient uptake, which results in significant biomass and grain yield reduction. Here we describe the effect of inoculation with Gaeumannomyces graminis (Sacc.) var. tritici (Ggt) on carbon assimilation rate (A) and biomass production of wheat plants grown under two water regimes. We show that the impact of Ggt inoculation on plant growth and leaf A may be through reduced photosynthetic capacity of the leaves and not water stress per se. The nature of this reduced photosynthetic capacity remains uncertain but may involve nutrient deficiency and different enzymes produced by the fungus. In each of the 3 years the experiment was conducted, Ggt significantly reduced A, i.e. at anthesis by 18% in 2000, 15% in 2001, and 12% in 2002. In agreement with other field studies, Ggt reduced tiller number and production of all plant components, mostly root dry mass and grain mass per plant. Highly significant negative correlations were found between disease rating and A in all years, showing that at disease ratings equal or higher than 3 (on a scale from 1 to 4) A could practically be zero. While A decreased, intercellular CO 2 concentration increased or did not change, and stomatal conductance was relatively high. In addition, A was more reduced under high than under low soil moisture content. These results support the idea that water stress per se did not contribute to the observed reduction of A. The mechanism of photosynthetic capacity reduction due to the Ggt root-rotting fungus is of interest as it may lead to the molecular mechanisms of plant resistance and ultimately to the development of take-all resistant plants.

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Variation in drought susceptibility among closely related wheat lines

Cited by 31 publications

References 12 publications

Root system plasticity to drought influences grain yield in bread wheat

Root system plasticity to drought influences grain yield in bread wheat

Breeding for drought tolerance in wheat (Triticum aestivum L.): constraints and future prospects

The effect of take-all disease on gas-exchange rates and biomass in two winter wheat lines with different drought response

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