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Comparative Enzyme Differentiation in Grass Roots. I. Acid Phosphatase
Charlotte J. Avers and Robert B. Grimm
American Journal of Botany
Vol. 46, No. 3 (Mar., 1959), pp. 190-193
Published by: Botanical Society of America, Inc.
Stable URL: http://www.jstor.org/stable/2439276
Page Count: 4
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There is a correlation between the pattern of acid phosphatase activity and the particular morphogenetic pattern in the root epidermis of festucoid and panicoid grasses. Four festucoid species all showed intensified enzyme activity in trichoblasts and loss of activity in hairless cell initials prior to the maturation of these cells. The 3 panicoid grasses showed no phosphatase-inactive cells during epidermal development. The festucoid epidermis contains alternating long and short cells which differentiate into hairless and hair cells respectively. The panicoid type shows no such cellular pattern and any epidermal cell seems capable of producing a root hair. Treatment of Phleum roots with 10-4 M coumarin caused a foreshortening of the growth zones and a concurrent apical shift in differential acid phosphatase activity. This response was interpreted as further evidence of a direct correlation between the morphogenetic and enzymatic differentiations in the root epidermis.
American Journal of Botany © 1959 Botanical Society of America, Inc.