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Plant diversification with respect to different sexual systems Niv Sabath November 2014 N. Sabath, T. Ashman, E. Goldberg, R. Ming, S.P. Otto, J. Vamosi,

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Presentation on theme: "Plant diversification with respect to different sexual systems Niv Sabath November 2014 N. Sabath, T. Ashman, E. Goldberg, R. Ming, S.P. Otto, J. Vamosi,"— Presentation transcript:

1 Plant diversification with respect to different sexual systems Niv Sabath November 2014 N. Sabath, T. Ashman, E. Goldberg, R. Ming, S.P. Otto, J. Vamosi, M. Einhorn, L. Glick, and I. Mayrose. In prep. 01

2 Sexual reproduction Old – at least a billion years Primary method of reproduction in plants and animals Advantages: – Increased genetic variation -> adaptation – DNA repair – Reduce accumulation of deleterious mutations Affects speciation – cost of rarity

3 Sexual systems Dioecy Hermaphrodite male and female organs in same individual separate male and female

4 Sexual systems Dioecy Hermaphrodite male and female organs in same individual separate male and female 6% 95%Animals Plants

5 Sexual systems Dioecy Hermaphrodite male and female organs in same individual separate male and female 6% 95%Animals Plants Speciation Extinction Transition

6 Sexual systems Dioecy Hermaphrodite male and female organs in same individual separate male and female 6% 95%Animals Plants Association between sexual systems and diversification? Diversification = Speciation - Extinction Speciation Extinction Transition

7 Sexual systems in flowering plants Dioecy Hermaphrodite

8 Sexual systems in flowering plants Dioecy Hermaphrodite Disruption of self-incompatibility Miller, J. S., & Venable, D. L. (2000). Polyploidy and the evolution of gender dimorphism in plants. Science

9 Sexual systems in flowering plants Dioecy Hermaphrodite

10 Sexual systems in flowering plants Dioecy Hermaphrodite Strict Dioecy

11 Sexual systems in flowering plants Dioecy Hermaphrodite Broad Dioecy

12 Methods Data collection (sequences, sexual systems, plant attributes) Phylogenetic reconstruction (MAFT, MrBayes) Diversification analysis – BiSSE Association with plant attributes (growth form, life cycle, …)

13 Diversification analysis – BiSSE Binary State Speciation and Extinction (Maddison et al. 2007) 01 q10 q01 Likelihood function

14 Diversification analysis – BiSSE Binary State Speciation and Extinction (Maddison et al. 2007) Use MCMC for Bayesian analysis

15 Diversification analysis – BiSSE Binary State Speciation and Extinction (Maddison et al. 2007) Asses significance PP(r0>r1) = %of MCMC steps in which r0 > r1

16 Diversification analysis – BiSSE Binary State Speciation and Extinction (Maddison et al. 2007) Asses significance PP(r0>r1) = %of MCMC steps in which r0 > r1 For one dataset: 2.5 > PP(r0>r1) > 97.5 For multiple datasets: median(PP(r0>r1)) <> 50

17 Data 57 genera 3662 species 38% with state assignment 20% dioecy, 80% others

18 Data Filter out genera with less than 10 species and 2 in each state 57 genera 3662 species 38% with state assignment 20% dioecy, 80% others 38 genera

19 Data Filter out genera with less than 10 species and 2 in each state 57 genera 3662 species 38% with state assignment 20% dioecy, 80% others 38 genera 28 genera Filter out genera with PP differ by >20% between runs with different priors

20 Results Bimodal distribution: dioecy is associated with high diversification in some genera and low in others Diversification

21 Results Diversification is driven by speciation, not extinction Diversification SpeciationExtinction

22 Results No association with plant attributes

23 self-compatibility (SC) vs. self-incompatibility (SI)?

24 Bimodal distribution of self-incompatibility (Raduski et al. Evolution, 2011)

25 self-compatibility (SC) vs. self-incompatibility (SI)? Goldberg et al. (Science 2010) showed that hermaphrodite SC species diversify slower than SI species

26 Weak points Strong effect of sample size – a more conservative filter? Diversification

27 Weak points Effect of trait distribution


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