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, Clive S; Cowan, Keith A; Bertling, Isa; Botha, Christiaan E J; Cross, Robin H M

Title: Symplastic solute transport and avocado fruit development : a decline in cytokinin/ABA ratio is related to appearance of the Hass small fruit variant
Creator: Moore-Gordon, Clive S
Creator: Cowan, Keith A
Creator: Bertling, Isa
Creator: Botha, Christiaan E J
Creator: Cross, Robin H M
Date Issued: 1998
Date: 1998
Type: Article
Identifier: vital:6525
Identifier: http://hdl.handle.net/10962/d1005959
Description: 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.
Format: 19 pages
Language: English
Relation: 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. Available: http://pcp.oxfordjournals.org/content/39/10/1027.full.pdf+html

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