Figure 4.

Phenotypic effects of loss-of-function rga and rgl mutations in a GA-deficient background. A, ga1-3 and rgl mutant combinations without rga-28. B, ga1-3, rgl, and rga-28 mutant combinations and a wild-type control. C, Primary inflorescence stems of mutants and wild type, as labeled. D, Flowers of mutant plants and wild type, as labeled. The front-most floral organs (sepal, petal, and in some cases stamen) were removed to expose the interior of the flower. Wild-type and homozygous mutant plants were grown on soil under long-day conditions. The plants shown in panels (A) and (B) are 73 d old, except for wild type, which is 44 d old.