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© 1989 Oxford University Press

RESEARCH-ARTICLE

Cold-Inhibited Phloem Translocation in Sugar Beet

IV. ANALYSIS OF THE COOLING-INDUCED REPARTITIONING HYPOTHESIS

MICHAEL A GRUSAK 1 and P. E. H. MINCHIN2

Physics and Engineering Laboratory, DSIR Private Bag, Lower Hutt, New Zealand

2 To whom correspondence should be addressed.

Systems identification techniques were used to calculate photo-assimilate transport characteristics in Beta vulgaris and Pisum sativum, before and after the application of localized perturbations to the transport path. Changes in photo-assimilate partitioning to various monitored sinks were found to be promoted by slow cool (25 °C to 1 °C in 40 min), quick cool (25 °C to 1 °C in 2 min)/quick warm, and apoplastic osmotic treatments of a localized region of the source leaf petiole in Beta. Photo-assimilate partitioning into both intact and surgically modified (embryo-less) ovules of Pisum was also observed to change following quick cool/quick warm treatments applied to a 2.0 cm region of the peduncle leading to the monitored pod. No changes in transport properties were observed through the treated petiole region of Beta during or following the slow cool treatment (i.e. transit time or system gain). High apoplastic osmolality (addition of 1 000 mol m–3 sorbitol) reduced the transit time of tracer movement through the treated petiole of Beta, while enhancing tracer washout from the bathed tissue region. Our modelling techniques have shown that the physical or physiological basis for the sink partitioning changes must be due to alterations downstream of the treated pathway zone, suggesting the involvement of physical signals transmitted from the treated region. These results support the previously presented cooling-induced repartitioning hypothesis (Grusak and Lucas, 1986) and demonstrate that pathway-originated stimuli can alter source-sink photo-assimilate partitioning.

Key words: Photo-assimilate partitioning, phloem translocation, Beta vulgaris, Pisum sativum


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