Replicate altitudinal clines reveal that evolutionary flexibility underlies adaptation to drought stress in annual <i><scp>M</scp>imulus guttatus</i>

Kooyers, Nicholas J.; Greenlee, Anna B.; Colicchio, Jack M.; Oh, Morgan; Blackman, Benjamin K.

doi:10.1111/nph.13153

Cited by 141 publications

(217 citation statements)

References 76 publications

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“…For example, clinal patterns of phenotypic differentiation have very recently been characterized in monkeyflowers [123], Ivyleaf morning glories [124], Sakhalin firs [125], Anolis lizards [126], and Japanese sika deer [127]. Connecting these recent examples of phenotypic variation to patterns of genomic variation will clearly be a fruitful avenue for future exploration.…”

Section: The Future Of Clinal Genomicsmentioning

confidence: 99%

Revisiting classic clines in Drosophila melanogaster in the age of genomics

2015

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Adaptation to spatially varying environments has been studied for decades, but advances in sequencing technology are now enabling researchers to investigate the landscape of genetic variation underlying this adaptation genome wide. In this review, we highlight some of the decades-long research on local adaptation in Drosophila melanogaster from well-studied clines in North America and Australia. We explore the evidence for parallel adaptation and identify commonalities in the genes responding to clinal selection across continents as well as discuss instances where patterns differ among clines. We also investigate recent studies utilizing whole-genome data to identify clines in D. melanogaster and a number of other systems. Although connecting segregating genomic variation to variation in phenotypes and fitness remains challenging, clinal genomics is poised to increase our understanding of local adaptation and the selective pressures that drive the extensive phenotypic diversity observed in nature.

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Section: The Future Of Clinal Genomicsmentioning

confidence: 99%

Revisiting classic clines in Drosophila melanogaster in the age of genomics

2015

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“…A comprehensive understanding of the molecular mechanisms that underlie drought responses is required for classical breeding or genetic modification of crop species for enhanced drought tolerance. To date, hundreds of genes have been identified that control key processes in the plant responses to drought stress, such as stress signal perception (Osakabe et al, 2013;Zhu, 2016), signal transduction and amplification (Kim, 2014), and adaptation (Kooyers et al, 2015). The potential of a number of these genes to improve the drought tolerance of crop species has been demonstrated in field trials (Hu and Xiong, 2014).…”

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The E3 Ligase TaSAP5 Alters Drought Stress Responses by Promoting the Degradation of DRIP Proteins

et al. 2017

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In Arabidopsis (Arabidopsis thaliana) plants growing under normal conditions, DEHYDRATION-RESPONSIVE ELEMENT BINDING PROTEIN2A (DREB2A) is present at low levels because it is ubiquitinated and destabilized by DREB2A INTERACTING PROTEIN1 (DRIP1) and DRIP2 through 26S proteasome-mediated proteolysis. Drought stress counteracts the ubiquitination and proteolysis of DREB2A, thus allowing the accumulation of sufficient amounts of DREB2A protein to activate downstream gene expression. The mechanisms leading to drought stress-mediated DREB2A accumulation are still unclear. Here, we report that the wheat (Triticum aestivum) TaSAP5 protein, which contains an A20/AN1 domain, acts as an E3 ubiquitin ligase to mediate DRIP degradation and thus increase DREB2A protein levels. Drought induces TaSAP5 expression in wheat, and TaSAP5 overexpression in Arabidopsis and wheat seedlings increased their drought tolerance, as measured by survival rate and grain yield under severe drought stress. TaSAP5 can interact with and ubiquitinate TaDRIP, as well as AtDRIP1 and AtDRIP2, leading to their subsequent degradation through the 26S proteasome pathway. Consistent with this, TaSAP5 overexpression enhances DRIP degradation and increases the levels of DREB2A protein and its downstream targets. These results suggest that TaSAP5 acts to link drought with DREB2A accumulation and illustrate the molecular mechanisms involved in this process.

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“…Many plants (Arabidopsis, Phyllostachys heterocycla, Mimulus guttatus, etc.) accelerate flowering to complete life cycle under drought conditions (Peng et al, 2013;Wolfe and Tonsor, 2014;Kooyers et al, 2015), a phenomenon referred to as drought escape (DE). Because drought triggers phytohormone abscisic acid (ABA) biosynthesis and signal transduction, it has been proposed that ABA mediates DE response.…”

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A Drought-Inducible Transcription Factor Delays Reproductive Timing in Rice

Zhang

Zhao

et al. 2016

Plant Physiol.

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The molecular mechanisms underlying photoperiod or temperature control of flowering time have been recently elucidated, but how plants regulate flowering time in response to other external factors, such as water availability, remains poorly understood. Using a large-scale Hybrid Transcription Factor approach, we identified a bZIP transcriptional factor, O. sativa ABA responsive element binding factor 1 (OsABF1), which acts as a suppressor of floral transition in a photoperiod-independent manner. Simultaneous knockdown of both OsABF1 and its closest homologous gene, OsbZIP40, in rice (Oryza sativa) by RNA interference results in a significantly earlier flowering phenotype. Molecular and genetic analyses demonstrate that a drought regime enhances expression of the OsABF1 gene, which indirectly suppresses expression of the Early heading date 1 (Ehd1) gene that encodes a key activator of rice flowering. Furthermore, we identified a drought-inducible gene named OsWRKY104 that is under the direct regulation of OsABF1. Overexpression of OsWRKY104 can suppress Ehd1 expression and confers a later flowering phenotype in rice. Together, these findings reveal a novel pathway by which rice modulates heading date in response to the change of ambient water availability.Flowering time (or heading date) and drought resistance are two major yield traits in crops, especially rice (Oryza sativa). As global climatic change looms, drought has become the biggest abiotic stress to limit crop yields. Breeders have capitalized on naturally occurring genetic variations to improve or maintain crop yield in times or areas of drought by different strategies (Eisenstein, 2013). Manipulation of floral transition has been a promising way to maximize crop yield during dry periods. This strategy has been successful due to extensive identification of genetic loci and elucidation of molecular mechanisms that control flowering time under diverse or unpredictable environments.Heading date in rice is influenced by many environmental cues such as day length (photoperiod), temperature, nutrition, and water availability. Molecular mechanisms that underlie photoperiod regulation of flowering time have already been characterized, probably because day length is more predictable than other environmental factors during seasonal changes. Rice is a facultative short-day plant that flowers earlier in short days (SDs) than in long days (LDs). Heading date 3a (Hd3a) and RICE FLOWERING LOCUS T1 (RFT1) are two paralogous genes in rice encoding "florigen" molecules expressed in the phloem of leaves and transported to the shoot apical meristem to promote flowering (Tamaki et al., 2007;

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Replicate altitudinal clines reveal that evolutionary flexibility underlies adaptation to drought stress in annual Mimulus guttatus

Cited by 141 publications

References 76 publications

Revisiting classic clines in Drosophila melanogaster in the age of genomics

Revisiting classic clines in Drosophila melanogaster in the age of genomics

The E3 Ligase TaSAP5 Alters Drought Stress Responses by Promoting the Degradation of DRIP Proteins

A Drought-Inducible Transcription Factor Delays Reproductive Timing in Rice

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