Inhibition of white light of sup 86 Rb sup + absorption in the root apex of corn. [Zea mays]

Journal Article · Fri Jun 01 04:00:00 EDT 1990 · Plant Physiology; (USA)

DOI:https://doi.org/10.1104/pp.93.2.767· OSTI ID:5941386

McKendree, W L; Smith, R C ^[1]

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1. Univ. of Florida, Gainesville (USA)

Measurements of cell lengths made at 0.5 millimeter intervals in median longitudinal sections of the primary roots of corn (Zea mays) were used to construct a growth curve. The region 1.5 to 4.0 millimeters from the apex contained the largest number of elongating cells. Absorption of {sup 86}Rb{sup +} was measured using intact, dark-grown corn seedlings. Following uptake and exchange, the terminal 8.0 millimeters of each root was cut into four 2.0 millimeter segments. Maximum {sup 86}Rb{sup +} uptake occurred in the region from 0.0 to 4.0 millimeter from the root tip. Washing the intact primary root in fresh 2.0 millimolar CaSO{sub 4} for 2 hours prior to uptake augmented the rate of {sup 86}Rb{sup +} uptake in all regions. Illumination with white light during washing caused a reduction of {sup 86}Rb{sup +} uptake as compared with controls washing in darkness, and the region of greatest light response was the region of elongation. Removal of the coleoptile prior to washing did not prevent the light inhibition of subsequent {sup 86}Rb{sup +} uptake. Removal of the root cap prior to washing in light partially reversed the light-induced inhibition of the washing response.

• OSTI ID: 5941386
• Journal Information: Plant Physiology; (USA), Journal Name: Plant Physiology; (USA) Vol. 93:2; ISSN 0032-0889; ISSN PLPHA
• Country of Publication: United States
• Language: English

Related Subjects

551001* -- Physiological Systems-- Tracer Techniques
59 BASIC BIOLOGICAL SCIENCES
ABSORPTION
ALKALI METAL ISOTOPES
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BIOLOGICAL EFFECTS
CEREALS
DAYS LIVING RADIOISOTOPES
ELECTROMAGNETIC RADIATION
GRASS
GROWTH
INTERMEDIATE MASS NUCLEI
ISOMERIC TRANSITION ISOTOPES
ISOTOPE APPLICATIONS
ISOTOPES
LILIOPSIDA
MAGNOLIOPHYTA
MAIZE
MINUTES LIVING RADIOISOTOPES
NUCLEI
ODD-ODD NUCLEI
PLANT GROWTH
PLANTS
RADIATIONS
RADIOISOTOPES
ROOT ABSORPTION
ROOTS
RUBIDIUM 86
RUBIDIUM ISOTOPES
SEEDLINGS
TRACER TECHNIQUES
UPTAKE
VISIBLE RADIATION