Root Development in Aluminous Hawaiian Soils
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1963-10
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University of Hawai'i Press
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Abstract
Roots of Rhodomyrtus tomentosa and Melastoma malabathricum
were excavated in three soil series from the bauxitic area of Kauai . Root systems
of R. tomentosa and M. malabathricum in Kapaa and Halii soils were very shallow,
with tap roots turning laterally at shallow depth and with long lateral roots
very close to the soil surface. Deeper tap-root penetration of R. tomentosa and
M. malabathricum was observed in the Koolau soil.
Lime and phosphorus treatments were added to bauxitic subsoils of the Kapaa
and Halii series in pots and Leucaena glauca (1.) was planted in the pots. Tap roots
of L. glauca were stimulated by phosphorus treatment, but were restricted in
untreated subsoils. Increased root development with phosphorus treatment seemed
to be more related to phosphorus supply than to decreased aluminum effects. No
evidence of root damage due to aluminum was found.
L. glauca: roots were sectioned with a freezing microtome and stained, using
hematoxylin without a mordant. Although all staining obtained could not be attributed
to aluminum, since other metals can act as mordants for hematoxylin,
intensity of staining was assumed to be related to aluminum concentration in the
tissues. Cell walls, nuclei, and cytoplasm stained in all tissues, and outer walls of
epidermal cells stained very heavily. Staining was more intense in roots from check
and P-treated plants than in roots from lime-treated plants.
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Plucknett DL, Moomaw JC, Lamoureux CH. 1963. Root development in aluminous Hawaiian soils. Pac Sci 17(4): 398-406.
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