The purposes of this study were to analyze the weediness potential associated with 'Vitamin A enforced rice' and to evaluate the relationships between growth characteristics and environmental adaption related to survival ability in the natural environment. 'Vitamin A enforced rice', 'Nagdong', donor variety of 'Vitamin A enforced rice' and three other varieties were used for this study. The 'Vitamin A enforced rice' was experimented according to ratio of ripened grain, shattering of grain, germination traits, germination ratio of low temperature, emergence ratio after wintering, ratio of viviparity, and growth ratio after ratooning ability. 'Vitamin A enforced rice' was not significant between 'Nagdong' and other varieties in seven characters. Germination ratio was similar of Vitamin A enforced rice' and 'Nagdong', but average germination ability of was different at low temperature. Also, shattering of grain and germination ratio of alternating temperature were significant between 'Nagdong' and other varieties. These results suggested that the relationships between growth characteristics and environmental adaption in 'Vitamin A enforced rice' could be applied to the stability of weediness potential and biosafety guide in GM rice.
This study was carried out to investigate the agronomic traits, comparison of weed characteristics and possibility of gene flow in 'vitamin A enforced GM rice' and the donor plant, 'Nagdong'. The GM rice was not significantly different agronomic traits compared to the donor plant, Nagdong. Weed population changes were investigated in the cultivation of the GM rice and the donor plant, Nagdong. Dominant weed species and their dry matter did not show the difference between GM rice and the donor plant, Nagdong in macro-GM crop field. Dominant weed species with the GM rice and the donor plant, Nagdong were Monochoria vaginalis, followed by Eleocharis kuroguwai, Echinochloa crus-galli and Lindernia procumbens. The detection of gene from the GM rice was done using PCR, gene flow can't be detected by weed species. Results of this study on the agronomic traits, weed characteristics and possibility of gene flow has elucidated that GM rice might not be different from the donor plant, Nagdong.
Bacterial blight (BB) disease is one of the most serious rice diseases in Korea. xa5 showing a wider spectrum resistance to Korean BB isolates is one of the most important bacterial blight resistance genes in rice breeding in Korea. A new rice cultivar 'Shinbaek' carrying xa5 gene was developed at the rice breeding team of the Department of Functional Crop, NICS, RDA in 2010. 'Shinbaek' was derived from the cross between 'Iksan469 and 'HR23966-22-1-2' carrying xa5 gene which was originated from indica rice 'IRBB5'. 'Shinbaek' is resistance to a major Korean BB isolate such as K1, K2, K3 and K3a, and it is also resistance tor ice stripe virus disease (RSV). Heading date of 'Shinbaek' is August 11 as mid maturing ecotype. The major agronomic characteristics of 'Shinbaek' is good plant type with short culm length, longer panicle length, higher number of spikelet per panicle as compared to those of 'Nampyeongbyeo', However, the number of tiller and grain filling ratio were lower compared to that of 'Nampyeongbyeo'. The grain appearance, amylose content, and protein content were similar with those of 'Nampyeongbyeo'. However the palatability of cooked rice and milling recovery were still lower than those of 'Nampyeongbyeo'. The milled rice yield of 'Shinbaek' is 5.75 MT per ha, 5.49 MT per ha and 4.68 MT per ha at the ordinary transplanting, double-crop system, and late transplanting of the local adaptability test, respectively. Thus, 'Shinbaek' would be a suitable cultivar to the mid and southern plain area, especially in BB disease prone area and it is a useful source to enhance the BB resistant breeding program.
Bacterial blight (BB) disease is one of the most serious rice diseases in Korea. xa5 showing a wider spectrum resistance to Korean BB isolates is one of the most important bacterial blight resistance genes in rice breeding in Korea. A new rice cultivar 'Shinbaek' carrying xa5 gene was developed at the rice breeding team of the Department of Functional Crop, NICS, RDA in 2010. 'Shinbaek' was derived from the cross between 'Iksan469 and 'HR23966-22-1-2' carrying xa5 gene which was originated from indica rice 'IRBB5'. 'Shinbaek' is resistance to a major Korean BB isolate such as K1, K2, K3 and K3a, and it is also resistance tor ice stripe virus disease (RSV). Heading date of 'Shinbaek' is August 11 as mid maturing ecotype. The major agronomic characteristics of 'Shinbaek' is good plant type with short culm length, longer panicle length, higher number of spikelet per panicle as compared to those of 'Nampyeongbyeo', However, the number of tiller and grain filling ratio were lower compared to that of 'Nampyeongbyeo'. The grain appearance, amylose content, and protein content were similar with those of 'Nampyeongbyeo'. However the palatability of cooked rice and milling recovery were still lower than those of 'Nampyeongbyeo'. The milled rice yield of 'Shinbaek' is 5.75 MT per ha, 5.49 MT per ha and 4.68 MT per ha at the ordinary transplanting, double-crop system, and late transplanting of the local adaptability test, respectively. Thus, 'Shinbaek' would be a suitable cultivar to the mid and southern plain area, especially in BB disease prone area and it is a useful source to enhance the BB resistant breeding program.
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