Bidirectional movement of labeled tracers in soybean seedlings

Crafts, A

Bidirectional movement of labeled tracers in soybean seedlings

Author

A. S. Crafts

Author Affiliations

A. S. Crafts was Professor Emeritus of Botany and Botanist Emeritus in the Experiment Station, Davis.

Publication Information

Hilgardia 37(16):625-638. DOI:10.3733/hilg.v37n16p625. January 1967.

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Abstract

Studies on transport mechanism in plants, using soybean seedlings and C¹⁴-labeled tracers, show that: 2,4-D* movement is largely restricted to phloem; monuron* movement takes place in xylem and cell walls; amino triazole* moves in phloem, xylem and cell walls; and maleic hydrazide* moves like amino triazole* and may leak from phloem to xylem and thus, circulate in the plant. Applied to epicotyl, 2,4-D* moves into and along the phloem, monuron* into and along the xylem, and amino triazole* and maleic hydrazide* into and along both phloem and xylem. These distribution patterns show selectivity of solute translocation, and support the concept of mass flow as the mechanism responsible for rapid, long-distance transport of foods in the plant.

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