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Ali, Mohammad Foteh, 2021. Endosperm-based postzygotic hybridization barriers in Arabidopsis and Capsella. Second cycle, A2E. Uppsala: SLU, Dept. Of Plant Biology



In Arabidopsis, endosperm development is very important for viable seed development.
Especially, endosperm cellularization is a crucial event for embryo survival and if it fails, can
lead to embryo arrest, as observed in seeds derived from interploidy and interspecies
hybridization. In case of interploidy crosses, increased ploidy level creates genome dosage
imbalance in endosperm and in case of different species, a similar dosage imbalance basis is
suspected, but remains to be broadly established. In this study, we investigated the viability of
hybrid seeds between two outbreeding species, Arabidopsis lyrata and A. arenosa, in relation
with the development of their endosperm. A. lyrata × A. arenosa (Female × Male) hybrid seeds
were shrivelled, dark brown and inviable, with delayed endosperm cellularization. In contrast,
A. arenosa × A. lyrata produced tiny inviable seeds with precocious endosperm cellularization.
We also investigated if similar mechanisms could exist between different populations of the
same species A. lyrata. In case of intraspecies crosses, A. lyrata Austrian population, when
used as seed plant, produced tiny seeds and when used as pollen donor, produced shrivelled
dark brown aborted seeds. However, no differences in endosperm cellularization were
identified. According to our results, we propose that the hybridization barrier observed between
A. lyrata and A. arenosa and between A. lyrata populations is a consequence of different levels
of parental conflict experienced by the mating partners. Finally, the genetic analysis of A.
arenosa and A. lyrata hybridization barrier suggests that cross direction-dependent multiple
loci are responsible for the non-reciprocal hybrid seed defects we observed.

Main title:Endosperm-based postzygotic hybridization barriers in Arabidopsis and Capsella
Authors:Ali, Mohammad Foteh
Supervisor:Lafon-Placette, Clément and Köhler, Claudia
Examiner:Berlin Kolm, Sofia
Volume/Sequential designation:156
Year of Publication:2021
Level and depth descriptor:Second cycle, A2E
Student's programme affiliation:NM008 Plant Biology - Master's Programme 120 HEC
Supervising department:(NL, NJ) > Dept. Of Plant Biology
Keywords:Endosperm development, Parental conflict, Genetic diversity, Auxin
Permanent URL:
Subject. Use of subject categories until 2023-04-30.:Plant genetics and breeding
Deposited On:05 Feb 2021 11:34
Metadata Last Modified:06 Feb 2021 02:00

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