[Variability of RNA in morphogenesis of sugar beet and sunflower leaves].

We investigated the developmental gene expression patterns of Beta vulgaris L. using DNA: RNA hybridization reactions. We found that 2,100 and 900 diversive poly(A)+mRNA were synthesized while 430 and 4,000 diversive poly(A)+mRNA were disappeared during greening in cells of cotyledons and during senescence in cells of yellowing leaves respectively.