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ULTRASTRUCTURAL CHANGES IN RADICLES OF BARNYARDGRASS (ECHINOCHLOA CRUS-GALLI [L.] BEAUV.) SEEDS DURING TRANSITION FROM DORMANCY TO GERMINATION

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In barnyardgrass seeds (Echinochloa crus-galli [L.] Beauv.), solutions of n-propanol relieve dormancy, while isopropanol is not active. Fully imbibed seeds require about a 24-h treatment with 0.3 M n-propanol at 35°C for subsequent germination stimulation at an alternating temperature of 20/30°C. The ultrastructure of the radicle apex from barnyardgrass seeds was analyzed by electron microscopy as affected by treatment with alcohols before germination starts and during germination. Germination is characterized by digestion of storage organelles and by a progressive vacuolization of the cells. Also, mitochondria elongate, Golgi bodies become well developed, and the endoplasmic reticulum (ER) develops in a multiple filament structure. Before germination starts, in axes from seeds treated either with water or with alcohols, the subcellular organelles are organized: short filaments of ER are visible, lipid bodies and amyloplasts are present, and protein bodies are partially digested. Some differences between the treatments are, however, evident. In the cells of radicles from seeds treated with n-propanol, mitochondria elongate, protein bodies fuse together, and lipid bodies are absent from many areas around the plasma membrane. The presence of more lipid bodies around the plasmalemma and the lack of fusion of protein bodies in the cells of radicles of dormant seeds suggest that both incorporation of lipid bodies into the plasma membrane and vacuolization of the cell could be inhibited in absence of the stimulus causing dormancy breakage. These results are consistent with our idea that the action of anesthetics relieving dormancy could be related to an effect on the synthesis of new membrane components and restoration of existing membrane systems in the radicles of the seeds.

Affiliations: 1: Center for Biologics Evaluation and Research, Food and Drug Administration ; 2: Plant Physiologists, USDA-ARS, Weed Science Laboratory

10.1080/0021213X.1990.10677155
/content/journals/10.1080/0021213x.1990.10677155
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/content/journals/10.1080/0021213x.1990.10677155
1990-05-13
2018-09-21

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