The vegetative cell cytoplasm is very dense, filled with numerous small vesicles, mitochondria, lipidic globules, amyloplasts
and ERr with extended cisternae.
are evident after staining with Lugol's.
While gravity causes the sedimentation of starch-laden amyloplasts
during perception, background vibration may be partially counteracting this stimulus.
In differentiated cells, plastids can be involved in anabolism (chloroplasts) or in storing reserves in amyloplasts
and elaioplasts (Wheatley, 1977).
In higher plants, much evidence suggests that amyloplasts
function as statoliths (Kiss et al.
In addition to working as photoassimilate repositories, soybean cotyledons become green and expand, suggesting that their amyloplasts
are transformed into chloroplasts.
In addition, at 4[degrees]C amyloplasts
sedimented normally in the gps mutants, indicating that the GPS loci affect an aspect of the gravity signal perception/transduction pathway that occurs after amyloplast
Starch granule number is a function of the number of amyloplasts
In plants, sedimentable amyloplasts
have been conceived of, since the turn of the century, as potential statoliths (Haberlandt, 1900; Nemec, 1900).
These VSPs are localized primarily in vacuoles, with smaller amounts associated with amyloplasts
(Avice et al.
The absence of amyloplasts
was similar to what was observed by Elmore and Bayer (1992) for perennial ryegrass seedlings treated with nitralin (4-methylsulphonyl-2,6dinitro-N, N-dipropy-laniline) and butralin [4-(1,1dimethylethyl)-N-(1-methylpropyl) -2,6-dinitrobenzenaminel.