Growth substances and tiller development in barley
dc.contributor.author
Rocha, Rosely de França
en
dc.date.accessioned
2019-02-15T14:19:07Z
dc.date.available
2019-02-15T14:19:07Z
dc.date.issued
1979
dc.description.abstract
en
dc.description.abstract
The early growth of tiller buds in barley is determined by
application of mineral nutrient solution to the growing medium.
The aim of this research was to determine whether the effect of
mineral nutrient supply is exerted through an effect on the levels
of endogenous growth regulators, particularly cytokinins. Three
approaches were used to examine the problem, namely to determine
the effects of exogenously applied growth substances on growth
of tiller buds, to observe bud growth under treatment expected
to modify the levels of endogenous cytokinins, and to measure
the cytokinin activity in plants supplied or not supplied with
minerals.
en
dc.description.abstract
Exogenously applied cytokinins not only increased lateral
bud growth in plants supplied with minerals but also promoted
growth of buds arrested by mineral nutrient stress. Application
of auxin or gibberellin increased dry matter in buds released from
apical dominance by either mineral nutrient or cytokinin application, but had no effect on arrested buds.
en
dc.description.abstract
Root removal treatments, expected to modify levels of endogenous
cytokinins, released growth of tiller buds under conditions
of lack of mineral supply. Both root removal experiments and
treatments with exogenous growth regulators confirmed the idea
of an important role for growth substances, particularly cytokinins
in the release of buds from apical dominance.
en
dc.description.abstract
Preliminary results showed the presence of a high level of
a cytokinin-like substance in plants given mineral nutrient
solution, which was absent in the deficient condition, also
favouring the initial idea.
en
dc.description.abstract
It is proposed that growth of axillary buds in vegetative
barley plants is controlled by interactions between nutritional
factors and endogenous growth substances. It is considered
that mineral nutrient availability determines the levels of
endogenous cytokinin which in turn determines whether or not
buds are released. Mineral nutrients, other metabolites and
growth substances are important in controlling subsequent
growth of the tiller bud.
en
dc.identifier.uri
http://hdl.handle.net/1842/33746
dc.publisher
The University of Edinburgh
en
dc.relation.ispartof
Annexe Thesis Digitisation Project 2019 Block 22
en
dc.relation.isreferencedby
en
dc.title
Growth substances and tiller development in barley
en
dc.type
Thesis or Dissertation
en
dc.type.qualificationlevel
Doctoral
en
dc.type.qualificationname
PhD Doctor of Philosophy
en
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