Distribution and its factors on Smut Disease of Sugarcane Caused by &lt;i&gt;Sporisorium scitamineum&lt;/i&gt; in Miyakojima city, Okinawa Prefecture.

Teramura, Kohei; Shimatani, Masayuki; Haraguchi, Dai; Nikawadori, Yuki; Nakasone, Hiroaki; Shimoji, Yoshiro; Sunakawa, Yoshinobu; Majikina, Motoji; Ishimine, Hirokatsu; Iyama, Kazuhiko; Yoza, Kazufumi; Tedokon, Tadashi

doi:10.4241/kyubyochu.64.18

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“…From the 1930s to 1970s, smut disease was not observed as a result of the spread of resistant varieties, 'POJ2725' and 'POJ2878'. However, smut disease recurred in 'NCo310' at Ishigaki Island in 1972 (Yamauchi 1973) and was found throughout Okinawa Prefecture in 2001 because of the spread of the susceptible variety 'Ni9' (Teramura et al 2018). 'NCo310' and 'Ni9' show high yields in ratoon crop.…”

Section: Introductionmentioning

confidence: 99%

Detection of a major QTL related to smut disease resistance inherited from a Japanese wild sugarcane using GRAS-Di technology

et al. 2021

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Smut disease of sugarcane causes considerable yield losses and the use of resistant varieties is the best control practice. Our group identified a Japanese wild sugarcane with highly smut disease resistance named 'Iriomote8'. In this study, we conducted QTL analysis for smut disease resistance using a mapping population derived from a resistant variety 'Yaenoushie', in which resistance is inherited from 'Iriomote8'. We identified 4813 non-redundant markers using GRAS-Di technology and developed a linkage map of mapping parents. We evaluated smut disease resistance of the mapping population by the inoculation test. Consequently, a large number of clones did not show the disease symptoms and the distribution of smut disease incidence tended to be "L shaped". Composite interval mapping detected an identical QTL for indices of smut disease incidence with a markedly high LOD score (26.6~45.6) at the end of linkage group 8 of 'Yaenoushie'. This QTL explained approximately 50% of the cases of smut disease incidence. In the mapping population, there were no correlations between the indices of smut disease incidence and other agronomic traits. In conclusion, this QTL could be used for marker-assisted selection to significantly improve smut disease resistance without negative effects on other agronomic traits.

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Section: Introductionmentioning

confidence: 99%