Some Aspects of the Münch Hypothesis

Weatherley, P. E.

doi:10.1007/978-1-4684-8658-2_18

Cited by 6 publications

(3 citation statements)

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“…Our experiments, and also the experiments by Weatherley (1975) and by Martin and Komor (1980), present additional evidence that phloem transport from source to sink is dependent on turgor-pressure differences between sieve tubes of source regions and sieve tubes of sink regions (cf. Milburn 1980; see also references in first paragraph of "Introduction").…”

Section: Discussionsupporting

confidence: 70%

“…This movement couid be completely prevented by interrupting the phloem between source and sink. The explanation suggested by Weatherley (1975) for these results was that the mannitol reduced the water potential in the xylem so that water moved otit of the sieve tubes by osmosis; and that this led to a decrease in turgor pressure so that pressure Oow occurred along the sieve tubes. Our experiments constitute a parallel to the experiments of Weatherley (1975).…”

Section: Discussionmentioning

confidence: 91%

“…3.AL 2). Weatherley (1975) forced a 500 mM mannitol solution into the xylem of the one end of an excised willow stem segment. Radioactive phosphate, introduced at the other end of the stem segment via an abrasion in the bark, moved into the end of the segment which was treated with 500 mM mannitol.…”

Section: Discussionmentioning

confidence: 99%

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Turgor‐sensitive sucrose and amino acid transport into developing seeds of Pisum sativum. Effect of a high sucrose or mannitol concentration in experiments with empty ovules

Wolswinkel

Ammerlaan

1984

Physiologia Plantarum

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1984. Turgor-sensitive sucrose and amino acid transport into developing seeds of Pisum sativum. Effect of a high sucrose or mannitol concentration in experiments with empty ovules. -Physiol. Plant. 61: 172-182.Sugar and amino acid transport into empty ovules of Pisum sativum L. cv. Marzia was examined. In frtiits containing 4-6 developing seeds, the embryo was removed from four ovules. After this surgical treatment, each empty seed coat was filled with a solution (pH 5.5) containing a low (0, 50 or 200 mM), medium (350,400 or 500^ mM) or high (0.7 or 1 M) concentration of sucrose and/or mannitol. In pulse-labelling experiments with sucrose and a-aminolsobutyric acid (AIB), transport of sucrose and AIB into an empty ovule filled with a solution containing a high sucrose concentration was the same as transport into an ovule filled with a mannitol solution of similar osmolarity, demonstrating that a high sucrose concentration in the seed coat apoplast affects phloem transport of sucrose and AIB into the seed coat only by the osmotic effect. The osmolarity of a given solution filling the seed coat cavity appeared to be important for phloem transport of sucrose and AIB into empty ovules. In our experiments, 350 mM appeared to be the optimal concentration for sucrose and AIB transport into the cavity within an empty ovule, giving results comparable with transport into intact ovules. A lower osmoladty of the solution induced less transport. Very high sucrose or mannitol concentrations caused a strong inhibition of sucrose and AIB unloading from the seed coat, so that transport into the empty ovules was inhibited. A low (strongly negative) but not too low osmotic potential of the solution in tlie seed coat apoplast seems necessary to maintain a normal rate of phloem transport into developing seeds. Apparently, the "sink strength" of developing seeds is turgor-sensitive.Additional key words -Garden pea, phloem transport, phloem unloading, pressureflow mechanism, seed development, sink strength. P. Wolswinket (reprint requests) and A.

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Section: Discussionsupporting

confidence: 70%

Section: Discussionmentioning

confidence: 91%