Huang, Ya-Lun , Kao, Wen-Yuan .
Does Baker's rule also apply to the invasive plant, Bidens pilosa var. radiata, in Taiwan?
Reproduction plays an important role in colonization. According to Baker's rule, plants capable of uniparental reproduction are more likely to be successful colonists than plants being self-incompatible. In this study, breeding systems of one invasive (Bidens pilosa var. radiata) and two non-invasive varieties (B. pilosa var. minor & B. pilosa var. pilosa) of B. pilosa were compared to test the rule. Bagging and open pollination treatments of capitula were conducted for the three varieties. Results of the experiment revealed that capitula of B. pilosa var. radiata in bagging treatment produced almost no seed indicating of self-sterility of the variety. For the other two varieties, the bagged capitula did produce seeds, however, seed number and seed/ovule ratio from bagging treatment were less than that of open pollination treatment. To explore possible mechanisms contributing to the failure of seed production in bagged capitula of the invasive variety, we examined pollen tube growth of florets in bagging and open pollination treatments. Results suggested that self-sterility in B. pilosa var. radiata was the result of self-incompatibility. Thus, the contrast breeding systems between the invasive and non-invasive varieties seem contradicting to the rule. However, we found that B. pilosa var. radiata has better clonal growth ability than the two non-invasive varieties. The clonal growth ability might complement the disadvantage of self-sterility of the invasive variety to ensure reproductive success. By avoiding selfing, the invasive variety might have higher genetic diversity than the other two non-invasive varieties, which would benefit the invasive variety in heterogeneous environments.
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1 - National Taiwan University, Institute of Ecology and Evolutionary Biology, Rm. 1230 Life Science Building, NTU, No. 1, Sec. 4, Roosevelt Road, Taipei, 10617 Taiwa, Taipei, 10617, Taiwan
2 - National Taiwan university, Institute of Ecology and Evolutionary biology, Rm. 1230, Life science building, 1, Sec. 4, Roosevelt Rd. , Taipei, N/A, 10617, Taiwan
Presentation Type: Poster:Posters for Topics
Location: Khorassan Ballroom/Chase Park Plaza
Date: Monday, July 11th, 2011
Time: 5:30 PM