The pigment content and rates of primary photosynthetic reactions were determined in chloroplasts of 14-day-old pine (Pinus silvestris L.) seedlings grown in light and darkness. In addition, the functional activities were investigated in chloroplasts from dark-grown seedlings exposed to white, red (λ = 670 nm), and red + far-red (λ = 748 nm) light. Dark-grown seedlings were capable of performing the Hill reaction, noncyclic photophosphorylation, and phenazine methosulfate–supported photophosphorylation, although the reaction rates in chloroplasts from dark-grown plants were considerably lower than in preparations from light-grown plants. Light treatment of dark-grown seedlings rapidly activated the photoreduction of ferricyanide and photophosphorylation, while the additional accumulation of green pigments started only after a lag period of two hours. Preirradiation of dark-grown seedlings with red light stimulated the formation of pigments, especially chlorophyll b, as well as the functional activity of chloroplasts. When far-red light was applied after red-light exposure, the processes examined were inhibited. It is concluded that accumulation of the light-harvesting complex and functional activities of chloroplasts at the photosystem II level in pine seedlings are controlled by the phytochrome.
Russian Journal of Plant Physiology – Springer Journals
Published: Oct 8, 2004
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