Male sterile line in onion is essential to the development of hybrid varieties. Onion male sterile line 'Wonye30005' was developed by Bioenergy Crop Research Center, NICS, RDA in South Korea in 2010. Lodging date of 'Wonye30005' is May 15^th and it belongs to the early maturing type in Korea. We found the male sterile plants in ‘Hamasodachi’, early maturing open-pollinated variety, and the male-sterile plants were cross-pollinated with male fertile line, ‘M330’, the population of F₁ showed 100% male sterility and the F1 plants were subsequently backcrossed for five generations. 'Wonye30005' was numbered as ‘MMS77’ in 2009 and the corresponding male parent is called MMSB77. 'Wonye30005' has round bulb shape (Bulb index, 97), cold resistance, and excellent storage quality and average bulb weight is 253g. Flowering date is May 25^th and flower bud size is 84 mm in full bloom. The number and length of flower stalks per bulb are 4 and 134 cm, respectively. 'Wonye30005' has been filed in Korea Seed and Variety Service in 2010. Overall, 'Wonye30005' is promising male sterile line for early maturing type hybrid seed production and breeding program. (no 4673)

‘Dahomi’, a new sweetpotato variety, was developed for table use by the sweetpotato breeding team of Bioenergy Crop Research Institute, National Institute of Crop Science (NICS), RDA in 2012. This variety was derived from the cross between ‘Muan4’ and ‘Jinhongmi’ in 2005. The seedling and line selections were performed from 2007 to 2008, preliminary and advanced yield trials were carried out from 2009 to 2010, and the regional yield trials was conducted at five locations from 2011 to 2012 and it was named as ‘Dahomi’. This variety has three or five lobes leaf, green leaf, stem, and petiole. Storage root of ‘Dahomi’ was elliptic, red skin, light orange flesh. This variety is resistant to fusarium wilt, but susceptible to root-knot nematode. Texture of steamed storage root was intermediate, and degree Brix of steamed storage root was 24.8 °Brix. The total sugar content of raw and steamed storage root was 9.7, 32.0/100 dry weight (g), respectively, which was higher than that of ‘Yulmi. Storage root yield of ‘Dahomi’ was 26.3 MT/ha under the early seasonal cultivation, which was 52% higher than that of ‘Yulmi’. Storage root yield of ‘Dahomi’ was 21.9 MT/ha under the optimum and late seasonal cultivation, which was 35% higher than that of ‘Yulmi’. The number of storage roots over 50 g per plant was 2.8 and the average weight of storage root was 138 g under the optimum and late seasonal cultivation.

The production of hybrid onion (A. cepa L.) seed is economically feasible using systems of cytoplasmic male sterility (CMS). Therefore, male sterile (A-line) and maintainer (B-line) is essential to development of F1 hybrids. Male sterile line Wonye30006’ was developed by Bioenergy Crop Research Center, National Institute of Crop Science, RDA in South Korea in 2010. The first cross for introduction of CMS was conducted in 2000. Male-sterile parents which were selected from ‘F2-6’ breeding lines were pollinated with male fertile line ‘HMB’ (inbred line). The fertility test was conducted in 2002 and maintainer line ‘Mo2005’ was selected. The proportion of male-sterility plants of F1 population was 100% for subsequent four backcross generations. ‘Wonye30006’ was named ‘MMS66’ in 2009 and the corresponding male parent was called ‘MMSB66’. As an mid-late maturing type, lodging date is around May 25^th. ‘Wonye30006’ has round bulb and the average bulb weight is 184 g. Plant height and stem diameter are 56 cm and 12.4 mm, respectively. Number and the length of flower stalks per mother bulb are 122 cm and 6, respectively. Flowering date is June 4th and flower bud size is 81.2 mm. Wonye30006 will be used for development of F1 hybrids in breeding program. (no. 4674)