Fig. 1.

Gall index distribution of the populations derived from IL10-1 × CC3 in the different greenhouse at different seasons. a, b show gall index distribution of F2:3 in the Pailou greenhouse in 2011 spring and in the Jiangpu field in 2012 spring, respectively. c and d show gall index distribution of the F2:6 population in the Jiangpu greenhouse in 2014 Autumn and in the Baima greenhouse in 2015 spring, respectively. The gall index of each code was obtained by averaging the gall index of 5 plants from each family in RIL, which ranging from 0 to 5. Gall index = 0, represents immune, 0 < gall index < 3 represents resistant, gall index = 3 represents medium resistant, and 3 < gall index < 5 represents susceptible, gall index = 5 represents highly resistant. The arrows point to 2.3 and 4.3 represent the gall index of IL10-1 and CC3, respectively