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Assimilate transport in developing seeds of sunflower helianthus annuus l



Assimilate transport in developing seeds of sunflower helianthus annuus l



Journal of Plant Physiology 127(1-2): 1-10



Several aspects of sucrose and amino acid transport into developing seeds of sunflower (Helianthus annuus L.) were studied. "Blocks" containing ca. 50 achenes (in some cases ca. 100 achenes) were excised from a sunflower head, leaving a layer of head tissue below the base of the achenes, and these blocks were placed in a horizontal position on a medium containing a mixture of [3H]-sucrose and [14C].alpha.-aminoisobutyric acid (AIB). This procedure permitted uptake of labelled solutes via the wound surface of head tissues, followed by phloem transport into developing seeds. The pattern of assimilate transport from tissues of maternal origin (seed coat) to embryonic tissues was similar to the pattern described for legumes. Sucrose or AIB release from the seed coat was, to some extent, inhibited by a treatment with p-chloromercuribenzenesulfonic acid (PCMBS) or KCN, but a very rapid efflux into the seed coat apoplast appeared to be an important characteristic of assimilate unloading from the sunflower seed coat. A treatment with PCMBS reduced efflux of labelled sucrose and AIB from cotyledons. The efflux of AIB from cotyledons was also reduced by a KCN-treatment. A high solute concentration in the bathing medium (a series of rising mannitol concentrations) reduced net sucrose or amino acid efflux from cotyledons or seed-coat halves. This inhibitory effect of a high osmolality on net solute efflux was largely "saturated" at an osmolality of 250 mM mannitol. Although some differences do exist between data on sunflowers and data reported for legumes, most data obtained support the view that the control of assimilate transport into sunflower seeds does not differ much from that of transport into developing seeds of legumes.

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Accession: 004789333

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DOI: 10.1016/s0176-1617(87)80036-6


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