Figure 2

Phenotype of MRDD. A. Plants with MRDD scores of 1–9. Disease scores were primarily based on plant height. Here 1 = no symptom; 3 = slightly shorten superior internodes, about 4/5 plant height of healthy plant; 5 = dark-green leaves, waxy enations on abaxial surfaces of leaves and sheaths, obviously shorten superior internodes, about 2/3 plant height of healthy plant; 7 = severe shorten internodes, malformed tassels, about 1/2 plant height of healthy plant; 9 = severe stunning; suppressed flowering, and a lack of ears; plant height <1/3 of healthy plant. B. DSI distributions within segregating populations. Vertical arrows represent the DSI of parental lines.