Population Differentiation and Natural Selection for Water‐Use Efficiency in<i>Impatiens capensis</i>(Balsaminaceae)

Heschel, M. Shane; Donohue, Kathleen; Hausmann, Neil; Schmitt, Johanna

doi:10.1086/342519

Cited by 133 publications

(196 citation statements)

References 37 publications

Supporting

Mentioning

180

Contrasting

Unclassified

Order By: Relevance

“…In addition, higher A max may have been maladaptive or adaptively neutral (Tables 4, 5) because increased RuBP regeneration capacity is metabolically wasteful, especially when plants are operating at low C i because of stomatal closure (Sage 1994). In contrast to previous work (Dudley 1996;Heschel et al 2002Heschel et al , 2004Heschel and Riginos 2005), we found that lower g s , and therefore increased water conservation (Ehleringer 1993) was not adaptive in the dry environment for L. cardinalis. Instead, plasticity of g s was adaptive in L. cardinalis because plants with higher g s had higher fitness within the wet treatment (Table 5).…”

Section: Discussioncontrasting

confidence: 90%

“…Moreover, the available evidence suggests that plastic physiological responses occurring through both mechanisms can be adaptive or maladaptive in plants, depending on the ecological context. For example, stomatal closure under drought can be adaptive because of increased water con-servation (Ehleringer 1993;Dudley 1996;Heschel et al 2002Heschel et al , 2004 or maladaptive because of associated reductions in photosynthetic rate (Arntz et al 1998). Similarly, increased photosynthetic capacity through the up-regulation of ribulose-1,5-bisphosphate (RuBP) carboxylase/oxygenase (Rubisco) activity could allow plants to maintain relatively high instantaneous photosynthetic rate despite decreased C i (Anderson et al 2001).…”

mentioning

confidence: 99%

See 1 more Smart Citation

PLASTICITY OF PHYSIOOLGY INLOBELIA: TESTING FOR ADAPTATION AND CONSTRAINT

2006

View full text Add to dashboard Cite

Abstract. Phenotypic plasticity is thought to be a major mechanism allowing sessile organisms such as plants to adapt to environmental heterogeneity. However, the adaptive value of many common plastic responses has not been tested by linking these responses to fitness. Even when plasticity is adaptive, costs of plasticity, such as the energy necessary to maintain regulatory pathways for plastic responses, may constrain its evolution. We used a greenhouse experiment to test whether plastic physiological responses to soil water availability (wet vs. dry conditions) were adaptive and/or costly in the congeneric wildflowers Lobelia cardinalis and L. siphilitica. Eight physiological traits related to carbon and water uptake were measured. Specific leaf area (SLA), photosynthetic rate (A), stomatal conductance (g s ), and photosynthetic capacity (A max ) responded plastically to soil water availability in L. cardinalis. Plasticity in A max was maladaptive, plasticity in A and g s was adaptive, and plasticity in SLA was adaptively neutral. The nature of adaptive plasticity in L. cardinalis, however, differed from previous studies. Lobelia cardinalis plants with more conservative water use, characterized by lower g s , did not have higher fitness under drought conditions. Instead, well-watered L. cardinalis that had higher g s had higher fitness. Only A max responded plastically to drought in L. siphilitica, and this response was adaptively neutral. We detected no costs of plasticity for any physiological trait in either L. cardinalis or L. siphilitica, suggesting that the evolution of plasticity in these traits would not be constrained by costs. Physiological responses to drought in plants are presumed to be adaptive, but our data suggest that much of this plasticity can be adaptively neutral or maladaptive.

show abstract

Section: Discussioncontrasting

confidence: 90%

mentioning

confidence: 99%

PLASTICITY OF PHYSIOOLGY INLOBELIA: TESTING FOR ADAPTATION AND CONSTRAINT

2006

View full text Add to dashboard Cite

show abstract

“…The increased instantaneous water use efficiency confers a fitness advantage under stressful conditions in the field (Heschel et al 2002) and thus might increase the survival of tree species. The application of hydrogels leads to a significant reduction in the Vol.…”

Section: Resultsmentioning

confidence: 99%

The soil hydrogel improved photosynthetic performance of beech seedlings treated under drought

Jamnická¹,

Ditmarová²,

Kurjak³

et al. 2013

Plant Soil Environ.

View full text Add to dashboard Cite

The effect of soil amendment with the STOCKOSORB®500 MICRO hydrophilic polymer on the photosynthetic traits in beech seedlings (Fagus sylvatica L.) during 50 days of dehydration was investigated. Dehydration was detected through osmotic potential (Ψ s ) in the assimilatory organs of beech seedlings. The addition of Stockosorb positively affected the CO 2 assimilation rate (A) and instantaneous water use efficiency (A/T), for severely drought-treated seedlings. In comparison with irrigated plants, the values of A of non-irrigated plants with Stockoasorb substrate decreased by 50%, and in non-irrigated plants with common substrate by 88%. The fast kinetics of chlorophyll a fluorescence indicated chronic photoinhibition under drought treatment without Stockosorb, while no significant changes in maximal quantum efficiency (F v /F m ) were recorded under drought treatment with Stockosorb. The actual quantum efficiency of PSII (Φ PSII ) markedly decreased in both treatments -with and without Stockosorb, though significant differences were found only between control treatments and drought treatment without Stockosorb. Moreover, the thermal energy dissipation (NPQ) was strongly limited under severe drought stress. The capacity to down regulate PSII functionality through non-photochemical quenching was maintained under drought treatment with Stockosorb. The results indicate that an amendment with soil conditioner significantly improved the photosynthetic performance of drought-stressed beech seedlings.

show abstract

“…The two focal regions for candidate gene method validation are highlighted in green. (Heschel et al, 2002;Blum, 2005;Schmalenbach et al, 2014). By contrast, TSU originates from Southwestern Japan, where more mesic growing season conditions exist.…”

Section: Genetic Correlations Underlie Pleiotropic Qtlsmentioning

confidence: 98%

“…For example, mild early season drought may simultaneously select for cellular dehydration avoidance through stomatal closure (Heschel et al, 2002) and reduced growth rates (Schmalenbach et al, 2014). Alternatively, strong late season drought may select for drought escape through early flowering and fast growth while soil water conditions are favorable (Meyre et al, 2001;Heschel and Riginos, 2005;Sherrard and Maherali, 2006).…”

Section: Genetic Correlations Underlie Pleiotropic Qtlsmentioning

confidence: 99%

Exploiting Differential Gene Expression and Epistasis to Discover Candidate Genes for Drought-Associated QTLs in Arabidopsis thaliana

et al. 2015

View full text Add to dashboard Cite

Soil water availability represents one of the most important selective agents for plants in nature and the single greatest abiotic determinant of agricultural productivity, yet the genetic bases of drought acclimation responses remain poorly understood. Here, we developed a systems-genetic approach to characterize quantitative trait loci (QTLs), physiological traits and genes that affect responses to soil moisture deficit in the TSUxKAS mapping population of Arabidopsis thaliana. To determine the effects of candidate genes underlying QTLs, we analyzed gene expression as a covariate within the QTL model in an effort to mechanistically link markers, RNA expression, and the phenotype. This strategy produced ranked lists of candidate genes for several drought-associated traits, including water use efficiency, growth, abscisic acid concentration (ABA), and proline concentration. As a proof of concept, we recovered known causal loci for several QTLs. For other traits, including ABA, we identified novel loci not previously associated with drought. Furthermore, we documented natural variation at two key steps in proline metabolism and demonstrated that the mitochondrial genome differentially affects genomic QTLs to influence proline accumulation. These findings demonstrate that linking genome, transcriptome, and phenotype data holds great promise to extend the utility of genetic mapping, even when QTL effects are modest or complex.

show abstract

Population Differentiation and Natural Selection for Water‐Use Efficiency inImpatiens capensis(Balsaminaceae)

Cited by 133 publications

References 37 publications

PLASTICITY OF PHYSIOOLGY INLOBELIA: TESTING FOR ADAPTATION AND CONSTRAINT

PLASTICITY OF PHYSIOOLGY INLOBELIA: TESTING FOR ADAPTATION AND CONSTRAINT

The soil hydrogel improved photosynthetic performance of beech seedlings treated under drought

Exploiting Differential Gene Expression and Epistasis to Discover Candidate Genes for Drought-Associated QTLs in Arabidopsis thaliana

Contact Info

Product

Resources

About