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Fig. 5. RGA and RGL2 are key GA-response regulators of floral development. (A,B)
Comparison of growth of ga1-3 plants lacking single (A) or pairs of
(B) DELLA proteins at 48 days. Presence of wild-type gene (and functional
protein) is indicated by +, presence of loss-of-function mutation (and lack of
functional protein) is indicated by -. (C) ga1-3 plants lacking RGA
and RGL2 initially produced sterile non-opening flowers (bottom right; SEM far
right), then began to produce fertile open flowers (top right; SEM far right)
when they were 
50 days old. By contrast, ga1-3 plants lacking
RGA alone (middle) never produced any fertile flowers.
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