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( Mekapogu Manjulatha ),( Hwang Bae Sohn ),( Yul Ho Kim ),( Su Jeong Kim ),( Kwang Soo Cho ),( Oh Keun Kwon ),( Yong Ik Jin ),( Su Young Hong ),( Jeong Hwan Nam ),( Jong Taek Suh ),( Ji Kyoung Choi ) 한국육종학회 2014 Plant Breeding and Biotechnology Vol.2 No.3
Quantification of potato glycoalkaloids (PGA) exerting toxicity to humans has some limits if applied to potato breeding populations on a large scale due to its high cost and time consumption. The aim of this study was to investigate key genes involved in PGA biosynthesis and their tuber expression patterns in two potato cultivars, Atlantic with low PGA content (18.6 mg/100g FW) and Haryoung with high PGA content (40.1 mg/100g FW), and to test the utility of these PGA gene transcript levels as selectable markers in potato breeding program. Pot grown potato plants of both ‘Atlantic’ and ‘Haryoung’ were exposed to drought stress where the transcript accumulation of 3-hydroxy-3-methylglutaryl coenzyme A reductase 1 (Hmg1) and squalene synthase 1 (Pss1) gene was doubled in the tubers of ‘Haryoung’ at 5days after stress (DAS). The abundance of Hmg1, Pss1, solanidine galactosyl transferase, solanidine glucosyl transferase and rhamnosyl transferase gene transcripts increased at 10 DAS. Especially, the ratio of Hmg1 and Pss1 transcripts in tubers of ‘Haryoung’ to those in tubers of ‘Atlantic’ was higher at 5 DAS compared to that at 10 DAS. The results suggest that drought treatment for 5 days can make a distinct difference in the transcript levels of Hmg1 and Pss1 correlated to PGA levels in tubers of ‘Atlantic’ and ‘Haryoung’, and the mRNA level of Hmg1 and Pss1 can be used as selection markers for breeding potato cultivars with low PGA levels.
Manjulatha Mekapogu,권오근,Do Yoon Hyun,Kyung Jun Lee,Myung Suk Ahn,Jong Taek Park,Jae A Jung 한국원예학회 2020 Horticulture, Environment, and Biotechnology Vol.61 No.1
Chrysanthemum has several hundreds of commercialized cultivars with similar morphological characters including flower color and type. Correct labelling of the cultivars and protecting the intellectual property rights of the breeder requires an accurate and reliable method to discriminate the cultivars. Simple sequence repeat (SSR) markers were used to identify and discriminate the standard type cultivars in chrysanthemum. 23 SSR markers from the chrysanthemum SSR database were used to identify eleven standard type chrysanthemum cultivars. Of the 23 SSRs, 7 markers showed polymorphic fragments. A total of 187 alleles were obtained using 7 SSR markers in 11 cultivars. The number of alleles per locus ranged from two to four with an average of 2.7 per locus. The polymorphism information content (PIC) of 7 SSRs ranged from 0.25 to 0.60 with an average of 0.41. Genetic relationship by cluster analysis based on unweighted pair group method with arithmetic mean (UPGMA) method revealed a genetic distance of 0.25–1.00 among the 11 cultivars. The 11 standard type cultivars were discriminated by the ChSSR_16 marker alone. However, two cultivars (Sei_no_issei and Makoto) showed complete genetic similarity and could not be distinguished. Hence, the results showed that these SSR markers may prove useful in identifying additional chrysanthemum cultivar types and to assess genetic relationships among cultivars.
정진철,김수정,홍수영,남정환,손황배,김율호,Manjulatha Mekapogu 한국작물학회 2015 한국작물학회지 Vol.60 No.2
This study was carried out to determine environmental factors affecting the anthocyanin content of colorfleshed potato (Solanum tuberosum L.) tubers. After planting of two color-fleshed potato cultivars of ‘Hongyoung’ and ‘Jayoung’ in different 14 locations, their soil chemical properties and meteorological data were evaluated, and anthocyanin contents of tubers were analyzed after harvest, additionally their relationship among them was analyzed through correlation analysis. In comparison with two cultivars, purple-fleshed ‘Jayoung’ potatoes showed higher anthocyanin content than red-fleshed ‘Hongyoung’ in almost locations. When locations were divided to three categories (highland, sub-highland and lowland) according to altitude, in general, highland-grown tubers had the higher content of anthocyanin compared to those grown in lowland. An analysis of the results of chemical components of soil showed that anthocyanin content of color-fleshed potato tubers was negatively correlated with the pH of soil. In addition, mean temperature and minimum temperature from 80 to 100 days after planting most significantly affected on the accumulation of anthocyanin in color-fleshed potato tubers, that is, higher content of anthocyanin was observed in tubers produced in locations with lower mean temperature and minimum temperature from 80 to 100 days after planting. This information can be useful to producers and industries in selection of proper fields for the production of color-fleshed potato tubers having high quality in Korea.