Lemma primordia

Fig. 7. Diagram showing the changes in frequency of cells incorporating thymidine- H in lemma primordia of awned and hooded barley before and during the stages of cushion differentiation in the hooded genotype.

Fig. 8. Median longitudinal sections of lemma primordia from apices excised and treated for 6 hours with th)unidine- H at a concentration of 5 / C/mI in 2% sugar solution. (A) Awned. (B) Hooded immediately before cushion formation. (C) Hooded at the cushion stage. X150. From Yagfl (1965).

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