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Profil korisnika/ce dortizba
D. Ortiz-Barrientos
D. Ortiz-Barrientos
D. Ortiz-Barrientos
@dortizba

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D. Ortiz-Barrientos

@dortizba

Adaptation and Speciation. Predictability in evolution. Tree crops. Teacher. Helper. Listener. Music, philosophy, and chess. Dad of three. Enamoured partner.

Brisbane, Australia
ortizbarrientoslab.org
Vrijeme pridruživanja: travanj 2009.

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    D. Ortiz-Barrientos‏ @dortizba 17. stu 2019.
    • Prijavi Tweet

    Fantastic work led by Melanie Wilkinson (@mjwilkinson10) and Federico Roda (@RodaFederico) on the shared molecular basis of local adaptation and hybrid failure. Thread on preprint follows.1/https://www.biorxiv.org/content/10.1101/845354v1 …

    18:06 - 17. stu 2019.
    • 34 proslijeđena tweeta
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    34 proslijeđena tweeta 57 korisnika označava da im se sviđa
      1. Novi razgovor
      2. D. Ortiz-Barrientos‏ @dortizba 17. stu 2019.
        • Prijavi Tweet

        In 2013, F. Roda et al. discovered that multiple parapatric population pairs of coastal Senecio lautus had repeatedly and independently evolved contrasting growth habits. Populations found in sand dunes were tall, whereas those on the rocky headlands were prostrate. 2/pic.twitter.com/OERET8Smsk

        Headland ecotype. https://tinyurl.com/yx6xxqvm
        Dune Ecotype
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      3. D. Ortiz-Barrientos‏ @dortizba 17. stu 2019.
        • Prijavi Tweet

        Despite their morphological parallelism, it seemed that alleles differentiated between Dune and Headland populations at any given location were rather unique. 3/ https://tinyurl.com/wa5l3d2 pic.twitter.com/WaMZWXwxE6

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      4. D. Ortiz-Barrientos‏ @dortizba 17. stu 2019.
        • Prijavi Tweet

        Nonetheless, these uniquely differentiated alleles in each population pair seemed to belong to the same biological function. 4/ https://tinyurl.com/wa5l3d2 pic.twitter.com/cEm9gHD5I2

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      5. D. Ortiz-Barrientos‏ @dortizba 17. stu 2019.
        • Prijavi Tweet

        Here, F. Roda further confirmed differentiation in genes with similar function in 3 independent DxH hybrid populations segregating plant height and number of secondary branches. 5/pic.twitter.com/PkyJz03q3V

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      6. D. Ortiz-Barrientos‏ @dortizba 17. stu 2019.
        • Prijavi Tweet

        One of the major functions that was consistently different between Dune and Headland and DxH hybrid populations was hormone signalling, in particular the production and movement of the hormone auxin. 6/pic.twitter.com/oBTRD0m8NG

        Image from Wikipedia - https://en.wikipedia.org/wiki/Auxin
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      7. D. Ortiz-Barrientos‏ @dortizba 17. stu 2019.
        • Prijavi Tweet

        Darwin was one of the first to propose that auxin was important for plant movement, which can be observed when a plant bends its shoot upwards when placed on its side. Bending in response to changes in the gravity vector is called gravitropism. 7/pic.twitter.com/MXP8RVs0he

        Picture by Mathieu Rodriguez - https://commons.wikimedia.org/wiki/File:Gravitropism_tree.jpg#/media/File:Gravitropism_tree.jpg
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      8. D. Ortiz-Barrientos‏ @dortizba 17. stu 2019.
        • Prijavi Tweet

        We looked for reported gravitropism mutants in Arabidopsis and learned that they often fail at bending their shoot after the embryo emerges from the seed. We reasoned that such traits might also differ between Dune and Headland populations. 8/

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      9. D. Ortiz-Barrientos‏ @dortizba 17. stu 2019.
        • Prijavi Tweet

        F. Roda and M. Wilkinson explored this pattern in multiple Dune and Headland population pairs as well in a different ecotype that lives in the alpine regions of Australia, and that also has tall and prostrate forms. 9/pic.twitter.com/I8upETKXkv

        Dune population on the left, Headland population on the right
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      10. D. Ortiz-Barrientos‏ @dortizba 17. stu 2019.
        • Prijavi Tweet

        They discovered that tall plants responded better to changes in gravity cues than prostrate plants. Moreover, the height of the plant predicted the strength of bending in each population! So, it seems that evolution of integrated phenotypes had occurred in many populations. 10/pic.twitter.com/zW1ua6AMfw

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      11. D. Ortiz-Barrientos‏ @dortizba 17. stu 2019.
        • Prijavi Tweet

        Although both plant height and gravitropism have evolved repeatedly and independently multiple times, we wanted to directly test whether these traits could respond to selection in the natural habitats, and in the expected direction of evolution. 11/pic.twitter.com/cph5ZmW14p

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      12. D. Ortiz-Barrientos‏ @dortizba 17. stu 2019.
        • Prijavi Tweet

        M. Wilkinson and F. Roda created families with Headland-like genomes that segregated tall offspring. Mel asked if offspring of short parents would do better in the rocky headland than offspring of tall parents. Yes! But what about gravitropism? 12/

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      13. D. Ortiz-Barrientos‏ @dortizba 17. stu 2019.
        • Prijavi Tweet

        G. Walter (@natureantics) had carried out a multi-year selection experiment in the dunes and headland at Lennox Head. There, he allowed the top 50% of surviving families to make it into the next generation. He started with three genetic replicates of a DxH F8 population. 13/pic.twitter.com/YAgKiD80HG

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      14. D. Ortiz-Barrientos‏ @dortizba 17. stu 2019.
        • Prijavi Tweet

        Then, Mel took the survivors from the two environments and crossed them to produce an F11 generation. Her hypothesis was that high fitness families in the sand dune would produce offspring that responded to gravity whereas low fitness families would not. Yes! 14/pic.twitter.com/p6HaIYaqkr

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      15. D. Ortiz-Barrientos‏ @dortizba 17. stu 2019.
        • Prijavi Tweet

        With a link between height and gravitropism, and between divergence in growth habit and auxin pathway, Mel took ~70 individuals from each tail of the distribution and sequenced them with RADs. These markers in Senecio disproportionally target gene rich regions of the genome. 15/pic.twitter.com/ttm7cjjqxr

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      16. D. Ortiz-Barrientos‏ @dortizba 17. stu 2019.
        • Prijavi Tweet

        She predicted that differentiated loci between the gravitropic and the agravitropic tail would contain genes related to the auxin pathway. Of around 10,000 genes, only 55 were differentiated between the tails! And they were enriched for functions in transport of molecules! /16

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      17. D. Ortiz-Barrientos‏ @dortizba 17. stu 2019.
        • Prijavi Tweet

        At the top of the list she found two genes whose orthologues in other plant species had functions related to both the auxin and the abscisic acid pathways, and that those genes were in strong LD in the surviving but not in the control populations!pic.twitter.com/ZOIMUKPozA

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      18. D. Ortiz-Barrientos‏ @dortizba 17. stu 2019.
        • Prijavi Tweet

        Big shoutout to Scott Allen (@s_allen3) in assembling a long-read genome for Senecio! 17/

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      19. D. Ortiz-Barrientos‏ @dortizba 17. stu 2019.
        • Prijavi Tweet

        But did gravitropism affect reproduction? To test a genetic link between local adaptation and intrinsic reproductive isolation, Mel crossed F11 individuals within thee gravitropic tail, within the agravitropic tail, and between the two tails. 18/

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      20. D. Ortiz-Barrientos‏ @dortizba 17. stu 2019.
        • Prijavi Tweet

        She found that crosses within the same tail were successful but crosses between the gravitropic and agravitropic tails failed to produce seed 21% of the time! 19/

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      21. D. Ortiz-Barrientos‏ @dortizba 17. stu 2019.
        • Prijavi Tweet

        So, the same trait that evolved in parallel, that can respond to selection in nature in the expected direction, and that predicts growth habit of two ecotypes, also contributes to intrinsic hybrid failure! 20/

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      22. D. Ortiz-Barrientos‏ @dortizba 17. stu 2019.
        • Prijavi Tweet

        All in all, the repeated evolution of growth habit in Senecio is opening the doors for better understanding how adaptations evolve, and how ecological and non-ecological barriers to reproduction relate to one another. 21/

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      23. D. Ortiz-Barrientos‏ @dortizba 17. stu 2019.
        • Prijavi Tweet

        Hormone signalling divergence might be an easy mechanism for rapid evolution of integrated phenotypes that facilitate colonisation of new habitats, and to the incidental evolution of intrinsic reproductive isolation as a consequence! 22/

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      24. D. Ortiz-Barrientos‏ @dortizba 17. stu 2019.
        • Prijavi Tweet

        This work was possible to the relentless effort by many bright students, the wise advice of colleagues and friends, and the cooperation from councils, funding agencies, and volunteers. We are very excited for what it is to come! END/

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