Understanding the phenotypic and genetic mechanisms of plant-plant interactions

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Student thesis: Doctoral ThesisDoctor of Philosophy

Original languageEnglish
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Award date2019
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Abstract

In natural and agricultural environments, one of the key stresses that plants face
is competition from neighbours. Plant-plant interaction is a dynamic and multiple
process that involves numerous changes in morphology, physiology and
reproductive success (fitness). The mechanisms pertaining to competition and
its interaction with other stresses are poorly understood yet could have
important implications for breeding and crop management. Using a set of
Recombinant Inbred Lines derived from an Arabidopsis multiple advanced
generation intercross (MAGIC), morphological and fitness traits were compared
under competitive and non-competitive conditions, as well as under different
nutrient conditions. QTL mapping analysis was used to link phenotypic variation
with different genomic regions. Competition and its combination with nitrogen
availability decreased plant size and lateral branching, which is correlated with
reduced fruit number. QTL mapping found one potential QTL region related with
fitness under competitive scenarios and one region associated with competitive
ability. However, different QTL regions were found when competition was
combined with nitrogen availability. A strong QTL region was found for the
ERECTA allele, which results in a semi-dwarf genotype. An independent test of
the er mutation was associated with higher collective productivity under
competition and nutrient deficiency scenarios. The results of this study showed
the complex and dynamic genetic response of competition. Increased density
and nutrient availability clearly trigger different molecular mechanisms
associated with the phenotypic variation of several traits. Potential candidate
genes identified in this study will help to decipher the molecular basis of plantplant interactions

Documents

  • Martinez_Gina_Alessandra_Garzon

    Thesis, 12.2 MB, PDF

    Embargo end date: 31 Dec 2021

    Embargo reason: Seeking Publication

Documents

  • Martinez_Gina_Alessandra_Garzon

    Thesis, 12.2 MB, PDF

    Embargo end date: 31 Dec 2021

    Request copy