Early germination of Arabidopsis pollen in a double null mutant for the arabinogalactan protein genes AGP6 and AGP11 |
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Authors: | Sílvia Coimbra Mário Costa Marta Adelina Mendes Ana Marta Pereira João Pinto Luís Gustavo Pereira |
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Institution: | 1. Departamento de Biologia, Faculdade de Ciências, Universidade do Porto, Edifício FC4 Rua do Campo Alegre s/n, 4169-007, Porto, Portugal 2. BioFIG, Center for Biodiversity, Functional and Integrative Genomics, Universidade do Porto, 4169-007, Porto, Portugal
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Abstract: | The pollen specificity of the Arabidopsis arabinogalactan protein (AGP) genes AGP6 and AGP11 suggests that they are integral to pollen biogenesis, and their high percent of sequence similarity may indicate a potential
for overlapping function. Arabidopsis agp6 agp11 double null mutants have been studied in our laboratory, and in the present work, we characterize the germination and growth
of its pollen. When compared to wild type, mutant agp6 agp11 pollen displayed reduced germination and elongation, both in vivo and in vitro, and precocious germination inside the anthers,
provided that sufficient moisture was available. This characteristic was not observed in wild type plants, even in water content
conditions which for the mutant were sufficient for pollen germination. Therefore, an additional distinctive phenotypic trait
of arabinogalactan proteins AGP6 and AGP11 may be to avert untimely germination of pollen. Such AGPs may control germination
through water uptake, suggesting an important biological function of this gene family in pollen. |
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