Environmental Anoxia is Unnecessary for Inhibiting Chloroplast Photomorphogenesis in Rice Coleoptiles (Oryza sativaL.)

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Abstract
High population densities of germinating rice seedlings in initially air-saturated sealed aquatic environments exhibited d− seedling growth consisting solely of coleoptile emergence in light and dark environments. Residual oxygen tensions of 17–23% of the initially air-saturated water containing the d− seedlings were evident after 15 d in both the light and dark. Coleoptiles of all d− seedlings were stark white in appearance, lacked protochlorophyllide, and contained proplastids and amyloplasts, there being no evidence of normal etioplast development in the light or dark and no chloroplast development in the light. Thus, complete environmental anoxia was observed to be unnecessary for inhibiting normal chloroplast photomorphogenesis in coleoptiles of light-germinated rice seedlings. Increasing the oxygen tensions of the 15-d-old aquatic environments of light- and dark-germinated d− seedlings placed in the light resulted in normal chloroplast photomorphogenesis in coleoptiles, shoots, and roots.

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