The synthesis of short-chain saturated fatty acids and their role in the control of ethylene sensitivity in senescing petunia flowers

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dc.contributor.advisor Prof. C.S. Whitehead en_US
dc.contributor.author Botha, Marie Louise
dc.date.accessioned 2012-03-26T07:15:25Z
dc.date.available 2012-03-26T07:15:25Z
dc.date.issued 2012-03-26
dc.date.submitted 2000
dc.identifier.uri http://hdl.handle.net/10210/4564
dc.description Ph.D. en_US
dc.description.abstract The sensitivity of Petunia hybrida flowers to the plant hormone ethylene increases during the early stages of senescence and directly after pollination of the flowers. During these early stages .of senescence, ethylene production is very low and only increases after ethylene sensitivity had already increased. The increase in ethylene sensitivity is due to the forming of short-chain saturated fatty acids that accumulate in the petal tissue during the early stage of senescence. Following pollination, these acids are formed in the stylar tissue and transported to the corolla where it causes a rapid increase in ethylene sensitivity. The synthesis of short-chain saturated fatty acids is controlled by the enzyme acetyl-GoA carboxylase. As the acitivity of this enzyme decreases, the concentrations of short-chain fatty acids increase due to the lack of malonyl-GoA required for chain lengthening. During the early stages of senescence, the activity of this enzyme decreases simultaneously with an increase in short-chain fatty acids and ethylene-sensitivity. The results of this study indicate that acetyl-GoA carboxylase is a key enzyme involved in the control of ethylene sensitivity in petunia flowers. en_US
dc.language.iso en en_US
dc.subject Petunia en_US
dc.subject Plant hormones en_US
dc.subject Ethylene en_US
dc.title The synthesis of short-chain saturated fatty acids and their role in the control of ethylene sensitivity in senescing petunia flowers en_US
dc.type Thesis en_US

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