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Development and Evaluation of QTL-NIL for Grain Weight from an Interspecific Cross in Rice
Yeo Tae Yun,Dong Min Kim,In Kyu Park,Chong Tae Chung,Yeaul Kyu Seong,Sang Nag Ahn 한국육종학회 2010 한국육종학회지 Vol.42 No.4
In a previous study, we mapped 12 QTLs for 1,000 grain weight (TGW) in the 172 BC2F2 lines derived from a cross between Oryza sativa ssp. Japonica cv. Hwaseongbyeo and O. rufipogon. These QTLs explained 5.4 - 11.4% of the phenotypic variance for TGW. Marker-aided selection combined with backcrosses was employed to develop QTL-NILs for each QTL. BC2F2 lines with each target QTL were backcrossed to Hwaseongbyeo twice and then allowed to self to produce BC4F5 populations. SSR markers linked to TGW were employed to select QTL-NILs with the respective target QTL. Six QTL-NILs with the recurrent parent, Hwaseongbyeo were evaluated for nine traits for three years from 2007 and 2009. Differences were observed between each of the 6 QTL-NILs and Hwaseongbyeo in TGW. In addition to TGW, these QTL-NILs displayed differences in other agronomic traits possibly indicating a tight linkage of genes controlling these traits. The direction of the QTL for TGW in 6 QTL-NILs was consistent as in the BC2F2 lines from the same cross. Difference in TGW between each of the QTL-NILs and Hwaseongbyeo was associated with the difference in one or two grain shape traits; grain length, grain width, and grain thickness. SSR markers linked to the QTL for TGW will facilitate selection of the grain shape character in a breeding program to diversify grain shape and provide the foundation for map-based gene isolation. Also, the QTL-NILs developed in this report and the progenies from crosses between the QTL-NILs will be useful in clarifying epistatic interactions among QTLs for TGW.
Optimization of Temperature Regime to Screen Cold Tolerant Rice Seedlings
( Ung Jo Hyun ),( Sang Min Yeo ),( Sang Bok Lee ),( Jeong Heui Lee ),( Jong Min Jeong ),( Yeaul Kyu Seong ),( Dae Ha Seo ),( Yong Jae Won ),( Eok Keun Ahn ),( Jeom Ho Lee ),( Jun Cheol Mun ),( Cheol S 한국육종학회 2016 Plant Breeding and Biotechnology Vol.4 No.2
Low temperature stress at the seedling stage of rice is an important factor causing the leaf discoloration, wilting and consequently leads to non-uniform crop maturation. In order to screen the cold tolerance elite lines efficiently, the five cold treatment conditions with different water and air temperature were designed and treated at seedling stage. For the evaluation of seedling tolerance, the injury was scored by visual rate and measured by Soil and Plant Analyzer Development (SPAD) meter. In the reactions of varieties for each treatment, the treatment ``B`` condition, 12℃ mean water with 24℃ mean air, shows clear discoloration, so it`s correlation coefficient was highest (r=-0.9, P<0.0001) among the treatments. In the treatment condition for screening the cold-tolerance elite line, the cultivar, treatment and their interaction significantly affect the SPAD value. The ``A`` treatment, 12℃ mean water with 34℃ mean air, was the best way to observe the variation between the elite lines. On the basis of the Duncan`s test for SPAD value of cultivars, Keumo (moderate tolerant), Saetbyeol (sensitive) and Seolak (tolerant) were selected as check varieties. To study its impacts at the paddy field, the changes of crop characteristics such as height, panicle length, number of tiller and heading were investigated. In later growth period, the seedling treatment impact at the paddy field leads to heading delay. Due to the low temperature stress at the seedling stage induced by 12℃ mean cold water, Japonica and Tongil group shows the heading delay 4 to 7 and 8 to 11 days respectively.