Fig. 4.

Classes of down-regulated genes in the sporocyteless ovule as compared with the wild-type. Each class is represented by a specific example. (A) Genes specifically expressed in the female gametophyte. (B) Genes that are preferentially expressed in the female gametophyte as compared with sporophytic cells of the ovule. (C) Genes that require the presence of the female gametophyte to be expressed in sporophytic cells of the ovule, or genes for which sporophytic expression is dependent on the function of SPL.