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PLANT PHYSIOLOGY , Vol 107, Issue 2 407-411, Copyright © 1995 by American Society of Plant Biologists

DEVELOPMENT AND GROWTH REGULATION

Root-Shoot Interaction in the Greening of Wheat Seedlings Grown under Red Light

B. C. Tripathy and C. S. Brown
National Aeronautics and Space Administration, Mail Code: MD-RES (B.C.T.), Kennedy Space Center, Florida 32899

Wheat seedlings grown with roots exposed to constant red light (300-500 [mu]mol m-2 s-1) did not accumulate chlorophyll in the leaves. In contrast, seedlings grown with their roots shielded from light accumulated chlorophylls. Chlorophyll biosynthesis could be induced in red-light-grown chlorophyll-deficient yellow plants by either reducing the red-light intensity at the root surface to 100 [mu]mol m-2 s-1 or supplementing with 6% blue light. The inhibition of chlorophyll biosynthesis was due to impairment of the Mg-chelatase enzyme working at the origin of the Mg-tetrapyrrole pathway. The root-perceived photomorphogenic inhibition of shoot greening demonstrates root-shoot interaction in the greening process.




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Copyright © 1995 by the American Society of Plant Biologists