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Transport Gradient of Indoleacetic Acid in Pine Seedlings
Author(s) -
Zaerr J. B.
Publication year - 1968
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1968.tb07357.x
Subject(s) - apex (geometry) , concentration gradient , shoot , botany , regulator , auxin , growth regulator , pinus <genus> , biology , chemistry , horticulture , biochemistry , chromatography , gene
Movement of indoleacetic acid (IAA‐1‐ 14 C) through 5‐min segments from stems and roots of Pinus taeda L., P. jeffreyi Gtrev. and Balf., and P. ponderosa Laws, seedlings was measured. All three species showed the same general pattern of IAA‐1‐ 14 C transport. Predominantly downward movement occurred at all points along the stem and root; least IAA‐1‐ 14 C transport occurred in segments obtained near the shoot apex; and most occurred in segments obtained near or just below the cotyledons. This pattern of transport gradient is different from that reported in other plants. These results could be interpreted in either of two ways: (1) that transport limitations may control movement of the growth‐regulator, or (2) that the transport gradient may be an indication of endogenous growth‐regulator levels.