褐藻ヒジキのクロロフィルタンパク質複合体の色素組成と色素の季節的変動〔英文〕

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The pigment composition of chlorophyll-protein complexes (CPC, zones I-IV) separated by SDS-PAGE from the brown macroalgae Hizikia fusiformis was determined by using HPLC. The HPLC pigment profiles of chloroplasts showed the presence of chlorophyll a (Chl a), chlorophyllc (Chl c), fucoxanthin, β-carotene, and three minor xanthophylls. While Chl c was not found in zone I, in CPC, and β-carotene was present in both zone I and zone II, and fucoxanthin, neofucoxanthin, diadinoxanthin and diatoxanthin were found in all of zones I-IV In the brown orange zone IV, the molar ratio of Chl a/fucoxanthin was the lowest value of all zones, and Chl a, Chl c and fucoxanthin were present in a molar ratio of 3.3:1:2.7. The yield of chloroplasts reached the maximum value in August, and since then, showed a tndency to decrease according to the growth of H. fusiformis. In fronds and chloroplasts, the molar ratio of accessory pigments per Chl a became maximum in March. We demonstrated that zone IV contained over three times as much accessory pigments as other CPC, and that it was a main light-harvesting complex in H. fusiformis. Furthermore, wo found that molar ratios of xanthophylls and Chl c per Chl a were vaziable throughout the period of growth of H. fusiformis.
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