DEVELOPMENT OF THE CHLOROPHYLL AND CAROTENOID PIGMENTS IN BARLEY SEEDLINGS

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Abstract
Fluctuations are reported in the chlorophyll and carotenoid contents of barley seedlings grown for short periods in culture solutions modified with respect to Fe and K. The constancy of the chlorophyll/carotene ratio, noted by Euler and Hellstrom for etiolated seedlings, is extended to cover chlorotic seedlings, and also to those recovering from chlorosis induced by lack of Fe. Chlorophyll and carotenoids fluctuate together in general, though the carotene/ xanthophyll ratio is lower in chlorotic leaves. K under certain conditions increases the pigment content of the leaves. Limitations of analytical methods, and the necessity of preliminary adsorption studies on the pigment leaf complex are discussed.

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