Abstract
The theory of sexual selection, proposed by Darwin, explains the evolution of sexually dimorphic characters in animals. The idea was and is still being used to elucidate the exaggerated sexual traits in male animals. He claimed females to be better in making the reproductive investments for offsprings than males. This made him suggest strategies wherein females choose the best fit males and males compete among themselves for mate acquisition. Today the concept has been developed extensively, and various other sexually related traits have been suggested to evolve in the same manner. By highlighting and merging the frameworks of sexual selection envisioned by various researchers from time to time, the present chapter discusses how sexual selection can occur in plants even though individuals do not make a direct interaction. Traits influencing export and reception of pollen in both hermaphrodites and dioecious taxa affect pollination which is likely to influence mate acquisition. In many instances phenotypes facilitating pollen export are in harmony with those that enhance pollen receipt. However, the reverse can also be true. This suggests that visitation rate of pollinator(s) limits both male and female functions in same or different directions. The present chapter summarizes the theory of sexual selection and attempts to review the conceptual developments in plants using evidences from different fields. The theory drives fundamental evolutionary processes such as trait elaboration and speciation including plant and floral morphologies. The empirical findings concerning potentially affected traits are discussed. At the same time, care has been taken to address the criticisms fairly.
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Acknowledgements
We are thankful to Professor Rajesh Tandon of the Department of Botany, University of Delhi, for giving us an opportunity to dwell upon one of the trickiest topics of evolutionary biology. We feel indebted to Professor K. R. Shivanna for his critique and suggestions incorporation of which has improved the text considerably. We duly acknowledge the Head of the Department of Botany (UGC- SAP DRS II), University of Jammu for providing the library facilities. We thank the research scholars of our lab for their secretarial help.
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Kaul, V., Raina, M. (2020). Sexual Selection in Angiosperms: Paradox Re-visited. In: Tandon, R., Shivanna, K., Koul, M. (eds) Reproductive Ecology of Flowering Plants: Patterns and Processes. Springer, Singapore. https://doi.org/10.1007/978-981-15-4210-7_12
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