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Fig. 3. Mutations in Arabidopsis HEC genes result in reduced
fertility. (A) Wild-type Col-0 fruit; arrowhead points to shadow
cast by developing seed. (B) hec1 fruit show no obvious
abnormal phenotype. (C) hec3 fruit are shorter and exhibit
reduced fertility; arrowhead points to empty space that should be occupied by
seed. (D) hec1 hec3 fruit are variable in size but generally
short, with significantly reduced fertility. (E) HEC3p:HEC3
rescues hec1 hec3. (F) HEC2-RNAi hec1 hec3 fruit are
completely sterile. (G-J) Pollen tubes stained with Aniline Blue 24
hours post-pollination. In the wild type (G) and hec1 (H), the bulk
of the pollen tubes have nearly reached the base of the ovary (arrowhead). In
hec3 (I), pollen tubes are fewer in number and have not penetrated as
far as in the wild type or hec1 (arrowhead). In hec1 hec3
(J) there is a significant reduction in pollen tubes entering the ovary, and
penetration along the apical-basal axis is greatly diminished (arrowhead).
Scale bars: 1 mm in A-F; 0.1 mm in G-J.
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