Fig. 2

Formation, expansion and spread of lmpa of lmpa1 mutant at different growth stages after heading in 2019. Note: a: lmpa1 single plants have not been found lls on 23th April; b:lmpa1 leaves have a small amount of brown spots on 24th April; c: lmpa1 leaves have a significant increase in brown spots on 26th April; d: A large number of brown-yellow spots spread on the stem of lmpa1 on 30th April; e: lls on the leaf spread to the leaf sheath, and a few brown-yellow spots appeared on the stem of lmpa1 on 4th May; f:The brown and yellow spots on the stems continued to increase, and a few brown and yellow spots appeared on the spikes of lmpa1 on 16th May; g: lmpa1 leaves began to dry, and the brown and yellow spots on the spikes continued to increase on 20th May; h: lmpa1 leaves and stems were withered, part spikes were drying up on 24th May