Summary
The ultrastructure of chloroplasts from radish seedlings (Raphanus sativus L.) grown at high (24 klux; 250 W · m−2) and at low-light quanta fluence rates (1 klux; 15W · m−2) exhibits differences in many structural parameters.
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1.
The low-light (shade-type) chloroplasts are characterized not only by higher grana stacks and a higher stacking degree of thylakoids, but also by broader grana than the high-light (sun-type) chloroplasts. The latter are larger (length and width), possess large starch grains and contain more and larger plastoglobuli than the shade-type chloroplasts of the low-light plants, which are lacking starch.
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2.
The photosynthesis herbicide bentazon (10−4M) induces a shade-type adaptation (broader and higher grana stacks, higher stacking degree) particularly at high and to some extent also at low-light quanta fluence rates. The starch content and the number of plastoglobuli in the high-light bentazon chloroplasts is reduced as compared to the high-light controls.
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Abbreviations
- HL chloroplast:
-
chloroplast from the leaf of a high-light plant
- LL chloroplast:
-
chloroplast from the leaf of a low-light plant
- HL plant:
-
high-light plant grown at high-light quanta fluence rates
- LL plant:
-
low-light plant grown at low-light quanta fluence rates
- klux:
-
kilolux
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Meier, D., Lichtenthaler, H.K. Ultrastructural development of chloroplasts in radish seedlings grown at high- and low-light conditions and in the presence of the herbicide bentazon. Protoplasma 107, 195–207 (1981). https://doi.org/10.1007/BF01275618
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DOI: https://doi.org/10.1007/BF01275618