Symplastic Solute Transport and Avocado Fruit Development: A Decline in Cytokinin/ABA Ratio is Related to Appearance of the Hass Small Fruit Variant

Moore-Gordon, C.S. and Cowan, A.K. and Bertling, I. and Botha, C.E.J. and Cross, R.H.M. (1998) Symplastic Solute Transport and Avocado Fruit Development: A Decline in Cytokinin/ABA Ratio is Related to Appearance of the Hass Small Fruit Variant. Plant & Cell Physiology, 39 (10). pp. 1027-1038. ISSN 1027-1038

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Abstract

Studies on the effect of fruit size on endogenous ABA and isopentenyladenine (iP) in developing avocado (Persea americana Mill. cv. Hass) fruit revealed that ABA content was negatively correlated with fruit size whilst the iP/ABA ratio showed a linear relationship with increasing size of fruit harvested 226 d after full bloom. The effect of this change in hormone balance on the relationship between symplastic solute transport and appearance of the small fruit variant was examined following manipulation of the endogenous cytokinin (CK)/ABA ratio. Application of ABA caused seed coat senescence and retarded fruit growth but these effects were absent in fruit treated with equal amounts of ABA plus iP. Thus, the underlying physiological mechanisms associated with ABA-induced retardation of Hass avocado fruit growth appeared to be inextricably linked to a decline in CK content and included: diminution of mesocarp and seed coat plasmodesmatal branching, gating of mesocarp and seed coat plasmodesmata by deposition of electron dense material in the neck region, abolishment of the electrochemical gradient between mesocarp and seed coat parenchyma, and arrest of cell-to-cell chemical communication.

Item Type:Article
Additional Information:This is a pre-copy-editing, author-produced PDF of an article accepted for publication in Plant& Cell Physiology following peer review. The definitive publisher-authenticated version, Moore-Gordon, C.S., Cowan, A.K., Bertling, I., Botha, C.E.J. and Cross, R.H.M. (1998) Symplastic solute transport and avocado fruit development: a decline in cytokinin/ABA ratio is related to appearance of the Hass small fruit variant. Plant Cell Physiol. 39(10): 1027-1038,  is available online at: http://pcp.oxfordjournals.org/cgi/reprint/39/10/1027.pdf
Uncontrolled Keywords:Abscisic acid; Avocado {Persea americana); Hass small fruit variant; Isopentenyladenine; Plasmodesmata; Symplastic solute transport.
Subjects:Y Unknown > Subjects to be assigned
Divisions:Support Units > Electron Microscope Unit
Faculty > Faculty of Science > Botany
ID Code:318
Deposited By: Ms Vivien Botha
Deposited On:02 Nov 2006
Last Modified:06 Jan 2012 16:17
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