Figure 6.

Genetic analysis allows distinction of the GX synthesis genes into a major and minor function sets. A to L, The double, triple, and quadruple mutant combinations between irx9-L, irx10-L, irx14-L, and f8h do not exhibit a visible phenotype. A, Wild type (wt). B, irx10-L. C, f8h. D, irx9-L. E, irx14-L. F, irx10-L f8h. G, irx9-L irx10-L. H, irx10-L irx14-L. I, irx9-L irx14-L. J, irx9-L irx10-L f8h. K, irx9-L irx10-L irx14-L. L, irx9-L irx10-L irx14-L f8h. M, Double-mutant combinations between irx9, irx10, irx14, and fra8 show an enhanced phenotype and are infertile. From left to right are: irx10, fra8, irx9, irx14, irx10 fra8, irx9 irx10, irx10 irx14, irx9 fra8, fra8 irx14, irx9 irx14, and irx9 irx9-L. [See online article for color version of this figure.]