‘Gwangan’ is a new six-rowed covered barley cultivar developed by the National Institute of Crop Science (NICS), R.D.A in 2004. This cultivar is developed from a cross between “Mirak” and ‘Milyang59’ in 1995. An F6 selection was made at Milyang in 2001 an

Male and female strobilus production was assessed annually over a five-year period for a clonal seed orchard of sugi (Cryptomeria japonica D. Don) in Korea. Clonal fertility and fertility variation, expressed by both sibling coefficient and coefficient of variation in strobilus production among 40 orchard clones, were reported. Fertility varied among clones and among years, producing five-year averages per ramet of 464.3 and 971.1 for female and male strobili, respectively. The correlation between female and male strobilus production was positive in each of the five years studied and statistically significant with the exception of one poor flowering year. The clonal status number (Ns), a measure of genetic diversity, was calculated based on the observed clonal fertility variation, varying from 27.6 (N = 40) in the poorest flowering year (2002) to 35.8 in the best year (2005). On average (pooled), the relative status number was 95% of the census number (N). Variation of female fertility was higher than that of male fertility for the five consecutive years, and the status numbers of female and male parents reflected this variation. The pooled Ns estimation from all five years was higher than any single year, implying that genetic diversity would increase when seeds collected from different years are pooled. Sexual asymmetry calculations showed that clonal contributions would be balanced between genders

Wild rices are an important source of useful genes for resistance to diseases, insect pests, tolerance to abiotic stresses and yield increase. Interspecific hybrids were successfully produced between ten accessions of O. minuta (2n=48, BBCC) and O. sativa

This study was conducted to find out a desirable screening condition for the salinity tolerance in germination of rice. Seeds of 33 rice varieties were tested in NaCl solutions with various concentration levels. The germination percentage had a decreasing tendency with increasing NaCl concentration and inhibition concentration of 50% germination was 320mM. Standard deviation of germination percentage was highest (28.6) under 300mM NaCl. There was a highly significant correlation between the 50% germination concentration and the germination percentage at 20th day after seeding in 300mM NaCl. Also in 300mM NaCl, the germination percentage at 20th day after seeding was significantly correlated with the germination percentage at the 6th day after seeding. The salinity tolerance on the basis of germination percentage at 6th day after seeding in 300mM NaCl, was strong in 'Hyangnambyeo', 'Ilmibyeo', 'Kancheogbyeo', and 'Namwonbyeo', while weak in 'Ansanbyeo', 'Odaebyeo', 'Nonganbyeo', 'Dasanbyeo', and 'Namcheonbyeo'.

벼 약배양에 있어서 배양약의 viability의 변화를 관찰하고자 밀양 2003, 대청벼, 치악벼를 재료로 품종 및 저온전처리, 약의 갈변에 따른 호흡율의 변화를 2~3일 간격으로 조사하였다. 화분의 발육시기에 따른 배양전 약의 호흡활성은 개화직전에 가장 높았으며, 배양적기인 stage 3~4에서의 호흡율은 12.46 O2 n mode/ml/h/another이었다. 배양약의 호흡활성의 변화는 3~9일경에 1차 정점을, 9~11일경에 2차 정점을 나타냈으며, Callus 형성능이 높은 대청벼에서 가장 높게 나타났다. 저온전처리는 배양 초기의 호흡활성을 저하시켰으나 15일경부터는 무처리구 보다 높은 경향이었다. 또한 저온전처리는 약의 갈변을 촉진하였으며, 갈변약에서 호흡활성이 높았다.