Pseudomonas fuscovaginae affects the germination and early growth of rice and other cereals grown in Australia

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Pseudomonas fuscovaginae, the cause of sheath brown rot of rice, was first reported from Japan in 1976 and subsequently recorded in the rice growing region of Australia in 2005.
The pathogen causes lesions on the flag leaf sheath, grain discolouration, poor spike emergence and panicle sterility of rice and can damage the plant at all stages of growth.
Pseudomonas fuscovaginae is globally distributed and it has been reported to cause significant yield loss. The bacterium has also been reported as a pathogen on cereal crops such as wheat, maize, and sorghum, as well as the broadleaf Quinoa, however, the host range of strains isolated from Australia is not known. This study was conducted to assess the effect
of strains of P. fuscovaginae isolated from Australian rice on the germination and early growth of several cereal crops which are economically important to Australia. The early
detection of disease resistance by seed soaking with a 107 cfu /mL inoculum concentration and measuring the reduction in seedling height after 10 days has been used to evaluate
resistance in rice genotypes. Strains of P. fuscovaginae from Japan, Madagascar and Australia were used to inoculate seeds of rice, wheat, durum, barley, triticale, canola and millet.
Seeds were surface sterilised, before soaking in 107 cfu/mL of P. fuscovaginae. Controls consisted of seeds soaked in sterile distilled water. Petri dishes containing 20 seeds each
on moistened filter paper were maintained at 250C for 10 days, in a completely randomised trial consisting of four replicates. From each replicate, the percentage of germinated seeds were calculated, while the length of shoot, and both number and length of roots were assessed from 10 seedlings. Inoculation of seeds with P. fuscovaginae was found to significantly reduce the germination rate, root number, root length and shoot length
of ten bread wheat varieties. A similar result was observed for the two durum, two triticale and two barley varieties. For rice, a significant reduction in shoot length, root number and root length was observed for one variety and two breeding lines tested. One rice breeding line showed significant tolerance (to a strain of the pathogen from Japan), in terms of unaffected
germination, shoot length, number of roots and root length.
Original languageEnglish
Publication statusPublished - 25 Nov 2013
Event 19th Australasian Plant Pathology Conference -
Duration: 25 Nov 201328 Nov 2013 (Conference Handbook)


Conference 19th Australasian Plant Pathology Conference
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