Studies on a Maize Mutant Sensitive to Low Temperature II. Chloroplast Structure, Development, and Physiology |
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Authors: | Millerd A Goodchild D J Spencer D |
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Institution: | Division of Plant Industry, CSIRO, Canberra, A.C.T., Australia. |
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Abstract: | In the Zea mays L. mutant M11 grown in the dark at 15°, the ultrastructure of the etioplast is abnormal. The pigment content of the etioplasts is reduced but the in vivo absorption characteristics suggest that the normal protochlorophyll (ide)-holochrome is present. The lowered synthetic ability of the etioplasts is not primarily due to a reduced complement of plastid ribosomes. The plastids of mutant M11 grown in the light at 15° contain little pigment, are markedly deficient in ribosomes and their ultrastructure is abnormal. In mutant M11 grown at 15°, an extreme sensitivity of the plastid membranes to light was observed. |
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