Abstract
Double-fertilization in angiosperms requires precise communication between the male gametophyte (pollen), the female tissues, and the associated female gametophyte (embryo sac) to facilitate efficient fertilization. Numerous small molecules, proteins, and peptides have been shown to impact double-fertilization through the disruption of pollen germination, pollen tube growth, pollen tube guidance, or pollen tube penetration of the female tissues. The genetic basis of signaling events that lead to successful double-fertilization has been greatly facilitated by studies in the model organism Arabidopsis thaliana, which possesses a relatively simple reproductive physiology and a widely available T-DNA mutant seed collection. In this chapter, we detail methods for determining the effects of single gene loss-of-function mutations on pollen behavior through the creation of an internally controlled fluorescent hemizygous complement line. By transforming a single copy of the disrupted gene back into the homozygous mutant background, a precise endogenous control is generated due to the fact that pollen containing equal ratios of mutant and complemented pollen can be collected from a single flower. Using this experimental design, we describe multiple assays that can be performed in series to assess mutant pollen defects in germination, pollen tube elongation rate, and pistil penetration, which can be easily quantified alongside a “near-wildtype” complemented counterpart.
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Acknowledgements
This work was supported by startup funds from the University of Nevada, Reno Department of Biochemistry and Molecular Biology to I.S.W. and a National Science Foundation graduate research fellowship to D.K.S.
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Smith, D.K., Wallace, I.S. (2020). Internally Controlled Methods to Quantify Pollen Tube Growth and Penetration Defects in Arabidopsis thaliana. In: Geitmann, A. (eds) Pollen and Pollen Tube Biology. Methods in Molecular Biology, vol 2160. Humana, New York, NY. https://doi.org/10.1007/978-1-0716-0672-8_9
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DOI: https://doi.org/10.1007/978-1-0716-0672-8_9
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