All rights reserved. The massive starch grains give the plastids a very lumpy appearance. The accumulation of starch suggests that under constant light conditions the cells are unable to effectively use photosynthate and, as a result, growth is severely impaired. This is a conditional mutation in that near normal growth and depletion of the abnormal starch accumulation occur when gametophytes are grown under day-night conditions.
Sporophytes grow well under normal greenhouse day-night conditions.
X-ray induced, recessive in sporophytes.