Detection and transmission of seed-borne Colletotrichum gloeosporioides in redpepper, Capsicum annuum
1995
Lee, T.-H. | Chung, H.S. (Seoul National Univ., Suwon (Korea Republic). College of Agriculture and Life Sciences, Department of Agricultural Biology)
Seed samples of redpepper (Capsicum annuum) severely infected with Colletotrichum gloeosporioides were analysed to locate the infection sites within the seed. More than 500 seeds were dissected into seed coats, endosperms, and embryos before incubation. C. gloeosporioides was found to colonise 41 % of the seed coats and 36 % of the endosperm layers. The fungus was isolated from 2 % of the embryos among the samples examined. C. gloeosporioides resulted in 36 % seed rot, 13 % damping-off and/or seedling blight and 18 % brown discoloration of hypocotyl and cotyledons; 33 % of the seedlings had no apparent symptoms. In sections of infected seeds, inter- and intracellular mycelia were present in the seed coats and endosperms. Abundant sporulation was observed on the remnant of the funiculus from which mycelia extended over the surface of seed. The fungus in the remnant of the funiculus and adjacent endosperm tissue developed before the radicle emerged from which it was transmitted to the seedlings. Histopathological observations of the seedlings confirmed that C. gloeosporioides was transmitted from the endosperm tissue to the hypocotyls and radicles
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