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Quinone Distribution in Horse-Chestnut Chloroplasts, Globules and Lamellae

Rita Barr, Lynette Magree and F. L. Crane
American Journal of Botany
Vol. 54, No. 3 (Mar., 1967), pp. 365-374
Stable URL: http://www.jstor.org/stable/2440765
Page Count: 10
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Quinone Distribution in Horse-Chestnut Chloroplasts, Globules and Lamellae
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Abstract

The quinone content of whole and sonicated horse-chestnut chloroplasts was studied over a period of 6 months. Whole chloroplasts show a steady increase of plastoquinone A and C concentrations from May to September. By September 1 about 0.5 μ moles PQ A and about 0.3 μ moles PQ C plus D per mg chlorophyll are found in whole chloroplasts. The osmiophilic globule fraction of sonicated chloroplasts contains traces of PQ A but no PQ C in May By October 5 equal amounts of PQ A and PQ C plus D (0.15 μ moles per mg chlorophyll) are found in horse-chestnut globules. By Oct. 15 the PQ A content increases at least 20-fold, the PQ C content at least 7-fold. The lamellae fraction of sonicated horse-chestnut chloroplasts contains 0.05 μ moles PQ A and 0.03 μ moles PQ C plus PQ D in May By October 15 about 0.3 μ moles PQ A and 0 1 μ moles PQ C per mg chlorophyll can be found in lamellae. The total amount of plastoquinones accumulated in the globules accounts for up to 20% of the total accumulation in the chloroplast during the season.

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