Genetic and physiological analysis of juvenility in plants
Matsoukas, Ioannis G. (2010) Genetic and physiological analysis of juvenility in plants. PhD thesis, University of Warwick.
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Official URL: http://webcat.warwick.ac.uk/record=b2482762~S15
One of the distinguishable plant developmental events is the transition from the vegetative
to reproductive phase (RP) of development. This stage is preceded by the juvenile to
adult transition within the vegetative phase. During the juvenile vegetative phase (JVP)
plants are incompetent to initiate reproductive development and are effectively insensitive
to photoperiod. With the change to the adult vegetative phase (AVP), plants attain
competence to respond to floral inducers, which is required for the transition to the RP.
This study exploits Antirrhinum and Arabidopsis as model systems to understand the
genetic and environmental factors that regulate floral incompetence during the JVP.
Determinants such as irradiance and [CO2] were found to be key modifiers of the JVP.
A relationship between photosynthetic assimilate levels and vegetative phase transition
was revealed by analysis of carbohydrates in plants at defined developmental stages. Experimental
data suggest that carbohydrate levels may be required to reach a specific
threshold before plants undergo the transition from a juvenile to an adult phase of vegetative
growth. This may be necessary in order to sustain a steady supply of sugars
for sufficient bulk flow from the leaves to the shoot apical meristem (SAM), via the
phloem, to enable delivery of florigen, which thus renders the SAM competent to flower.
Determination of the JVP in Arabidopsis mutants impaired in different genetic pathways
has shown that multiple inputs influence the timing of the vegetative phase transition.
Carbohydrates have been demonstrated to be involved possibly through their function
as nutrients or signals or by their interaction with hormones. Physiological analysis of
flowering time mutants has shown that a variety of signals act to promote and enable the
juvenile to adult phase transition that involves both floral activators and repressors.
|Item Type:||Thesis or Dissertation (PhD)|
|Subjects:||Q Science > QK Botany|
|Library of Congress Subject Headings (LCSH):||Plant life cycles, Plants -- Reproduction, Snapdragons -- Physiology, Arabidopsis -- Physiology|
|Official Date:||June 2010|
|Institution:||University of Warwick|
|Theses Department:||School of Life Sciences|
|Supervisor(s)/Advisor:||Thomas, Brian, 1949- ; Massiah, Andrea Juliet|
|Sponsors:||Greek State Scholarship Foundation ; Warwick Horticulture Research International ; University of Warwick ; GCRI Trust ; Society for Experimental Biology (Great Britain) ; Great Britain. Dept. for Environment, Food & Rural Affairs (DEFRA)|
|Extent:||xxvii, 249 leaves : ill., charts|
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