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DER EINFLUSS VERSTÄRKTER CALLOSEBILDUNG AUF DEN STOFFTRANSPORT IN SIEBRÖHREN

Walter Eschrich, Herbert B. Currier, Shogo Yamaguchi and Robert B. McNairn
Planta
65. Bd., 1. H. (1965), pp. 49-64
Published by: Springer
Stable URL: http://www.jstor.org/stable/23365467
Page Count: 16
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DER EINFLUSS VERSTÄRKTER CALLOSEBILDUNG AUF DEN STOFFTRANSPORT IN SIEBRÖHREN
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Abstract

1. A local accumulation of sieve tube callose can be induced by injection of aqueous solutions of H3BO3 (5 · 10-5 mol, 10-3 mol) and CaCl2 (1.5 · 10-4 mol) into the cavity of petioles of Cucurbita maxima. 2. Injection of 5 · 10-5 mol H3BO3 caused a heavy callose deposition in 34.2% of the sieve tubes. Non-treated control plants contained only 5.4% sieve tubes with heavy deposition of callose. 3. 14C (as KH14CO3) was absorbed and assimilated nearly quantitatively by the leaf blade. The transport of labeled assimilates was not slowed down by callose depositions. 4. Induction of callose deposition by 10-3 mol H3BO3 showed a significant acceleration of the assimilate-movement. With autoradiographs and counting tube measurements it could be shown that roots and shoot tips of boric acid-injected plants contained essentially more 14C than the control plants. 5. The long distance transport of K-Fluorescein in sieve tubes was not affected by heavy callose deposition. In the region of the injection it was observed that the dye moved into the phloem parenchyma and the starch sheath. 6. In addition, historadiographs showed that 14C-labeled assimilates accumulated in the region of the injection. In boric acid treated plants, the plastids of the starch sheath had been labeled with 14C in the injection region.

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