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LIGHT‐INDUCED CHANGES IN THE VESICULAR APPARATUS OF Phycomyces SPORANGIOPHORES DURING THE PHOTOTROPIC RESPONSE
Author(s) -
Morales M.,
RuizHerrera J.
Publication year - 1990
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1990.tb01778.x
Subject(s) - phycomyces , phycomyces blakesleeanus , phototropism , vesicle , biophysics , biology , organelle , ultrastructure , botany , microbiology and biotechnology , physics , optics , blue light , membrane , biochemistry , mutant , gene
— We studied the ultrastructure of laterally illuminated stage I sporangiophores of Phycomyces blakesleeanus to determine whether the phototropic response had any structural correlate. Stimulated sporangiophores conserved the distinctive division into the four longitudinal zones described for state I, and showed no significant differences in the distribution of major organelles in the sides proximal and distal to the light source. On the other hand, apical vesicles were asymmetrically distributed, being present in lower numbers in the faster growing (distal) side of the sporangiophore. We suggest that this asymmetrical distribution reflects the differential utilization of vesicles necessary to sustain the corresponding growth rate of each side. Illumination therefore, must affect the rate of vesicle migration and utilization, more than their rate of synthesis.