Abstract
Sesame is an important vegetable crop for the production of oil in Korea. The main obstacle of sesame cultivation is the occurrence of
damping-oV diseases and wilt caused by a complex of soil-borne pathogens in Welds cultivated for two or more successive years. To protect
sesame seedlings against these diseases, Paenibacillus polymyxa E681, a plant growth-promoting rhizobacterium (PGPR) previously
shown to suppress disease incidence and promote growth on cucumber and pepper in the greenhouse and Weld experiments, was evaluated
for its capacity for biological control and growth promotion in vitro and in situ. Seed treatment with strain E681 alone did not show consistent
protection. Therefore, seed pelleting with strain E681 was attempted to increase the seed size and improve the stability and eVectiveness
of biocontrol capacity by strain E681. Through screening of pelleting materials, a combination of clay and vermiculite was
selected for further experiments to enhance seed germination and root colonization of strain E681 on sesame. In greenhouse trials, formulations
of strain E681 reduced disease incidence in disease-conducive soil. In the Weld, pelleting of sesame seeds with strain E681 signiWcantly
reduced pre- and post-emergence damping-oV compared to the non-treated or pelleting alone controls; pelleting also promoted the
plant growth and the grain yield. Furthermore, the eYcacy of strain E681 for biological control and plant growth promotion was
improved by sesame seed pelleting compared to the treatment with strain E681 alone. Hence, the application of strain E681 via seed pelleting
oVers potential to overcome some of the problems associated with successive years of sesame cultivation.
Abstract
Sesame is an important vegetable crop for the production of oil in Korea. The main obstacle of sesame cultivation is the occurrence of
damping-oV diseases and wilt caused by a complex of soil-borne pathogens in Welds cultivated for two or more successive years. To protect
sesame seedlings against these diseases, Paenibacillus polymyxa E681, a plant growth-promoting rhizobacterium (PGPR) previously
shown to suppress disease incidence and promote growth on cucumber and pepper in the greenhouse and Weld experiments, was evaluated
for its capacity for biological control and growth promotion in vitro and in situ. Seed treatment with strain E681 alone did not show consistent
protection. Therefore, seed pelleting with strain E681 was attempted to increase the seed size and improve the stability and eVectiveness
of biocontrol capacity by strain E681. Through screening of pelleting materials, a combination of clay and vermiculite was
selected for further experiments to enhance seed germination and root colonization of strain E681 on sesame. In greenhouse trials, formulations
of strain E681 reduced disease incidence in disease-conducive soil. In the Weld, pelleting of sesame seeds with strain E681 signiWcantly
reduced pre- and post-emergence damping-oV compared to the non-treated or pelleting alone controls; pelleting also promoted the
plant growth and the grain yield. Furthermore, the eYcacy of strain E681 for biological control and plant growth promotion was
improved by sesame seed pelleting compared to the treatment with strain E681 alone. Hence, the application of strain E681 via seed pelleting
oVers potential to overcome some of the problems associated with successive years of sesame cultivation.
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