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Etiolated barley (Hordeum vulgare L.) seedlings were treated with heat shock (HS). The heat treatment was conducted daily for 1 h at 40°C over 6 days and led to shortening of leaves and coleoptiles, an increase in the etioplast volume and prothylakoid length, and to a decrease in the size of paracrystalline prolamellar bodies (PLB). As a result of HS treatment, stimulation of carotenoid and protochlorophyllide...