Table 1 The origin of the Xcc strains used in this study

Lab strain: 8004

Cauliflower (Brassica oleracea var. botrytis)

Sussex, UK (1958)

(0E,51.0000N)

Type strain: ATCC33913

Brussels sprout (B. oleracea var. gemmifera)

UK (1957)

(0E,52.0000N)

Chinese strains

   CN01

Chinese cabbage (B. rapa subsp. pekinensis)

Haerbin, China (2002)

126.5192E,45.6534N

   CN02

Chinese cabbage (B. rapa subsp. pekinensis)

Changchun, China (2002)

125.4247E,43.7408N

   CN03

Chinese cabbage (B. rapa subsp. pekinensis)

Dalian, China (2002)

121.4837E,38.9351N

   CN04

Oilseed rape (B. napus ssp. oleifera)

Huhehaote, China (2002)

111.7378E,40.8792N

   CN05

Chinese cabbage (B. rapa subsp. pekinensis)

Daxing, China (2002)

116.3345E,39.7243N

   CN06

Chinese cabbage (B. rapa subsp. pekinensis)

Shunyi, China (2002)

116.6559E,40.1351N

   CN07

Chinese cabbage (B. rapa subsp. pekinensis)

Tianjin, China (2002)

112.6522E,37.8955N

   CN08

Radish (Raphanus sativus var. longipinnatus)

Taiyuan, China (2002)

117.0037E,39.2864N

   CN09

Chinese cabbage (B. rapa subsp. pekinensis)

Xi'an, China (2002)

108.9551E,34.5450N

   CN10

Chinese cabbage (B. rapa subsp. pekinensis)

Duqu, China (2002)

108.1164E,33.9359N

   CN11

Cabbage (B. oleracea var. capitata)

Nanyang, China (2002)

112.9521E,33.0564N

   CN12

Oilseed rape (B. napus subsp. oleifera)

Wuhan, China (2002)

114.4438E,30.4801N

   CN14

Leaf mustard (B. juncea var. foliosa)

Guilin, China (2003)

110.3181E,25.2582N

   CN15

Chinese cabbage (B. rapa subsp. chinensis)

Guilin, China (2003)

110.3207E,25.3817N

   CN16

Chinese cabbage (B. rapa subsp. pekinensis)

Guilin, China (2003)

110.0797E,25.2467N

   CN17

Chinese cabbage (B. rapa subsp. chinensis)

Nanning, China (2003)

108.3876E,22.8374N

   CN18

Leaf mustard (B. juncea var. foliosa)

Nanning, China (2003)

108.2181E,22.8018N

   CN20

Chinese kale (B. oleracea var. alboglabra)

Nanning, China (2003)

108.2865E,22.8874N