Growth and development of embryo parts during the germination of caryopses of the wild oat (Avena fatua L.) |
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Authors: | Manjarabad V S Raju Alina Walther William A Quick |
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Institution: | (1) Department of Biology, University of Regina, S4S OA2 Regina, Saskatchewan, Canada |
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Abstract: | Wild oat (Avena fatua L.) caryopses were germinated on moist filter paper and under water in the presence and absence of hydrogen peroxide (H2O2). The sequential growth and development of embryo parts were studied. Germination, as indicated by radicle emergence, was
least and slowest in caryopses submerged in deoxygenated water. The coleorhiza in such caryopses elongated much earlier than
the root, in contrast to the other treatments where the coleorhiza and the root emerged at about the same time. In caryopses
incubated on moist filter paper all embryo parts showed considerable growth. In H2O2 treated caryopses only the epicotyl showed substantial growth over the experimental period. In all treatments the first mitotic
peaks were noticed at the same period. The occurrence of these early nuclear divisions may be due to release of 4 C nuclei
from inhibition by the uptake of water during caryopsis imbibition. The mitosis continued in the radicle of the embryo in
those caryopses germinating on moist filter paper, indicating occurrence of DNA synthesis. In the other two treatments, however,
few divisions were detected. Here the early growth of the root, causing caryopsis germination, was due to cell elongation,
especially in the proximal part of the root. |
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Keywords: | Avena fatua (wild oat) Coleorhiza Germination Root |
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