Fig. 4. Scanning electron microscopic images of pollen grains from pollen of three soybean genotypes, sensitive (Stalwart III, A and B), intermediate (PI 471938, C and D), and tolerant (DG 5630RR, E and F) at optimal temperature of 30/22°C (A, C, and E) and supraoptimal temperature of 38/30°C (B, D, and F). The white line in each picture is 20.00 µm in length.