Plastid development in seedlings of Echinochloa crus-galli var. oryzicola under anoxic germination conditions |
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Authors: | Delmar VanderZee Robert A. Kennedy |
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Affiliation: | (1) Department of Horticulture and Landscape Architecture, Washington State University, 99164 Pullman, WA, USA;(2) Present address: Biology Department, Dordt College, Sioux Center, 51250, IA, USA |
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Abstract: | Plastid development in the primary leaf of Echinochloa crus-galli (L.) Beauv. var. oryzicola (Vasing.) Ohwi was followed during 5 d of anoxic germination and growth. Plastids develop slowly from simple spheroidal proplastids into larger pleomorphic plastids with several stromal membranes and many peripheral membrane vesicles. A small prolamellar body is present at 96 h with perforated (pro)thylakoids extending into the stroma. Changes in starch grains and plastoglobuli are evidence of carbohydrate and lipid metabolism. Plastid division is indicated by dumbbell plastid profiles after 4 d of anoxia. These results demonstrate that plastids not only maintain their integrity during anaerobic germination but also show developmental changes involving an increase in internal membrane complexity, although to a lesser extent than in etiolated shoots.Abbreviation PLB prolamellar bodyScientific paper No. 6167. College of Agriculture, Washington State University, Pullman |
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Keywords: | Anaerobiosis Echinochloa Germination (seeds) Oxygen (deficiency) Plastid development |
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