Figure 1.

Seed Weight and Viability after Intraspecific and Interspecific Crosses between A. thaliana and A. arenosa.

(A) to (E) Mature seeds: [2xAt × 2xAt] (A), [4xAt × 4xAt] (B), [4xAa × 4xAa] (C), [2xAt × 4xAa] (D), and [4xAt × 4xAa] (E). Bar = 1 mm.

(F) Mean weight of desiccated mature seeds from (A) to (E). Seeds from the [4xAt × 4xAa] cross (E) were separated into two classes, plump and shriveled, which were weighed separately. Each bar represents the grand mean of several means each obtained by weighing seeds in groups of 10 and dividing by 10 (n = number of groups weighed). From left to right: 25.1 ± 2.8 μg (n = 5), 38.3 ± 4.4 (n = 4), 65.4 ± 8.1 (n = 7), 6.9 ± 0.6 (n = 9), 44.1 ± 10.1 (n = 7), and 11.3 ± 1.2 (n = 5).

(G) Germination frequencies of seeds from (A) to (E). From left to right: 100% (n = 22), 100% (n = 22), 66% (n = 25), 0% (n = 109), 52% (n = 138), and 0% (n = 45).