Study: Inter-specific pollination of Arabidopsis thaliana and Malcolmia littorea
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Degree of Malcolmia littorea (Brassicaceae) pollen tube entrance into pistils of Arabidopsis thaliana strains. Pollen tubes were stained with aniline blue. Values indicate arbitrary compatibility scores based on the numbers of pollen tubes in the styles: 1: No tubes observed; 2: 1–19 tubes; 3: 20–39 tubes; 4: 40–59 tubes; 5: ≥60 tubes.