Fig. 5. Development of flower organs in enp and pid combinations. Sepals (S), petals (P) and stamens (St) were scored. Mean values and standard deviations are given. Shaded regions indicate the occurrence of organ fusion (in % of all flowers examined; e.g. 98% fusion of sepals in pid-15 enp/+ enp). The pid homozygous plants developed variably reproductive gynoecia, whereas pid enp/pid enp double mutants led to collapsed gynoecia or completely lacked flowers. Wild-type, + +/+ enp, + enp/+ enp and pid-x +/+ enp plants did not display conspicuous infertility. The pid enp/+ enp plants exhibited partial fertility, while pid-x enp/pid-x enp plants were always sterile. ^*A second set of plants/flowers analysed. ^**Two stems carried terminal flowers.