Variance for Water-Use Efficiency Among Ecotypes and Recombinant Inbred Lines of Arabidopsis thaliana (Brassicaceae)

Nienhuis, James; Sills, Gavin R.; Martín, B.; King, Gretchen

doi:10.2307/2445286

Cited by 34 publications

(35 citation statements)

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“…Large-scale natural genetic variation and quantitative trait locus mapping have been reported for integrated water relation parameters (Nienhuis et al, 1994;McKay et al, 2003;Poormohammad Kiani et al, 2007;Bouchabke et al, 2008;Collins et al, 2008) but, to our knowledge, not for plant tissue hydraulic properties. Information on the hydraulic properties of different tissues or organs might nevertheless be very important for plant breeding.…”

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confidence: 82%

Natural Variation of Root Hydraulics in Arabidopsis Grown in Normal and Salt-Stressed Conditions

et al. 2011

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To gain insights into the natural variation of root hydraulics and its molecular components, genotypic differences related to root water transport and plasma membrane intrinsic protein (PIP) aquaporin expression were investigated in 13 natural accessions of Arabidopsis (Arabidopsis thaliana). The hydraulic conductivity of excised root systems (Lp r ) showed a 2-fold variation among accessions. The contribution of aquaporins to water uptake was characterized using as inhibitors mercury, propionic acid, and azide. The aquaporin-dependent and -independent paths of water transport made variable contributions to the total hydraulic conductivity in the different accessions. The distinct suberization patterns observed among accessions were not correlated with their root hydraulic properties. Real-time reverse transcription-polymerase chain reaction revealed, by contrast, a positive overall correlation between Lp r and certain highly expressed PIP transcripts. Root hydraulic responses to salt stress were characterized in a subset of five accessions (Bulhary-1, Catania-1, Columbia-0, Dijon-M, and Monte-Tosso-0 [Mr-0]). Lp r was down-regulated in all accessions except Mr-0. In Mr-0 and Catania-1, cortical cell hydraulic conductivity was unresponsive to salt, whereas it was down-regulated in the three other accessions. By contrast, the five accessions showed qualitatively similar aquaporin transcriptional profiles in response to salt. The overall work provides clues on how hydraulic regulation allows plant adaptation to salt stress. It also shows that a wide range of root hydraulic profiles, as previously reported in various species, can be observed in a single model species. This work paves the way for a quantitative genetics analysis of root hydraulics.

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confidence: 82%

Natural Variation of Root Hydraulics in Arabidopsis Grown in Normal and Salt-Stressed Conditions

et al. 2011

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“…Fox 1990;Nienhuis et al 1994;Dudley 1996;Eckhart et al 2004;Sambatti and Rice 2007;Wu et al 2010). In the present study, we found consistent differentiation for tolerance to drought between Norwegian riverbed populations and Swedish shore populations.…”

Section: Among-population Differentiationmentioning

confidence: 99%

Variation in tolerance to drought among Scandinavian populations of Arabidopsis lyrata

Sletvold

Ågren

2011

Evol Ecol

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The ability to cope with water limitation influences plant distributions, and several plant traits have been interpreted as adaptations to drought stress. In Scandinavia, the perennial herb Arabidopsis lyrata occurs in open habitats that differ widely in climate and water availability in summer, suggesting differential selection on drought-related traits. We conducted two greenhouse experiments to examine differentiation in drought response traits among six Scandinavian populations, and to determine whether leaf trichomes confer protection against drought. We quantified tolerance to drought as fitness (survival and biomass of survivors) when exposed to drought relative to fitness under non-drought conditions. Two Swedish populations from shores along the Bothnian Bay had higher tolerance to drought than four riverbed populations from Norway. Under conditions of drought, the shore populations experienced less leaf damage compared to the riverbed populations, and their survival and biomass were less reduced relative to non-drought conditions. Across populations, tolerance to drought was positively related to leaf mass per area and negatively related to flowering propensity and proportion roots, but not related to plant size at the initiation of the drought treatment. In populations polymorphic for trichome production, trichome-producing plants were more tolerant to drought than glabrous plants. The results suggest that both leaf morphology and life-history traits contribute to differential drought response in natural populations of A. lyrata, and that this system offers excellent opportunities for examining the adaptive value and genetic basis of drought-related traits.

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“…Genetic variation in photosynthetic traits and biomass allocation patterns has been found among and within natural populations (Teramura and Strain 1979;Kalisz and Teeri 1986;Donovan and Ehleringer 1994;Nienhus et al 1994;Geber and Dawson 1997). Variation in size and biomass allocation contributes to variation in ®tness (Solbrig 1981;Geber 1990;Cheplick 1995).…”

Section: Introductionmentioning

confidence: 99%

Contribution of photosynthetic rate to growth and reproduction in Amaranthus hybridus

1998

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While it is known that genetic variation for photosynthetic and growth traits exists in natural populations, the functional significance of this variation remains unclear, particularly for photosynthetic traits. To test the hypothesis that photosynthetic rate has direct effects on reproduction as well as contributing indirectly to reproduction through effects on growth, we compared wild-type Amaranthus hybridus families to those with a single gene mutation that confers a lower photosynthetic rate. Wild-type and photosynthetic-mutant families were grown in competitive and non-competitive environments and we compared size, biomass allocation, architecture, and reproduction at three developmental stages. To assess the contributions of individual growth traits to reproduction, we calculated covariances between standardized traits and relative fitness (selection differentials), and compared selection between the two biotypes. Finally, we used path analysis to calculate the indirect effects of photosynthetic rate on fitness through growth. The size, allocation, and architecture of photosynthetic mutants did not differ from those of the wild type in either the competitive or non-competitive environment, with the exception that they were taller by the last developmental stage. However, the reproductive biomass of the photosynthetic mutants was significantly reduced compared to the wild type. In the competitive environment, the wild type achieved greater fitness because, while similar in size to the mutants, at any given size it produced more reproductive biomass. This suggests that photosynthetic rate affected the linkage between plant size and reproduction and is evidence of an indirect contribution to fitness. In the non-competitive environment, there were fewer differences in selection differentials between the two plant genotypes, suggesting fewer indirect effects. Path analysis showed that variation in photosynthetic biotype had indirect effects on reproductive biomass, via growth traits, and that there were no direct effects. Photosynthetic rate appears to have fitness consequences primarily through multiple contributions to growth throughout development.

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Variance for Water-Use Efficiency Among Ecotypes and Recombinant Inbred Lines of Arabidopsis thaliana (Brassicaceae)

Cited by 34 publications

References 0 publications

Natural Variation of Root Hydraulics in Arabidopsis Grown in Normal and Salt-Stressed Conditions

Natural Variation of Root Hydraulics in Arabidopsis Grown in Normal and Salt-Stressed Conditions

Variation in tolerance to drought among Scandinavian populations of Arabidopsis lyrata

Contribution of photosynthetic rate to growth and reproduction in Amaranthus hybridus

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