• Field reseach of geminiviruses infecting solanacous and cucurbit plants

• Breeding of geminivirus resistance pepper, tomato, eggplant, cucumber, and melon

• Biosynthesis of capsaicinoid in peppers

• Aroma and flavor of pepper fruits

• Temperature responses of plants

• Cultivation of solanaceous and cucurbit plants

• Field survey

• Molecular biology

• Tissue culture

• Microbial culture

1. Aqwin Polosoro, Kusumawaty Kusumanegara*, Wening Enggarini, Chotimatul Azmi, Muhamad Sabda, Deden Sukmadjaja, Toto Hadiarto, Sota Koeda, Sri Hendrastuti Hidayat. Genetic diversity of begomovirus PepYLCIV infecting chili peppers in the main producing area of West Java province, Indonesia. Journal of General Plant Pathology. In press. (2025)

2. Sota Koeda*, Mika Onouchi, Namiko Mori, Nadya Syafira Pohan, Hayato Shiragane. Pyramiding pepy-1 and Pepy-2 in pepper (Capsicum annuum) confers improved resistance against mixed infection with begomoviruses. Plant Disease. In press. (2025) (Click!!) (News Release)

3. Sota Koeda*, Isabel M. Fortes, Maria J. Rodríguez-López, Rafael Fernández-Muñoz, Enrique Moriones*. Resistance to the insect vector Bemisia tabaci enhances the robustness and durability of tomato yellow leaf curl virus resistance conferred by Ty-1. Plant Disease. In press. (2025) (Click!!)

4. Sota Yamamoto*, Sota Koeda, Ryutaro Nakano, Shota Sakaguchi, Atsushi J. Nagano, Yoshiyuki Tanaka, Fumiya Kondo, Kenichi Matsushima, Nobuhiko Komaki. Genetic diversity and phylogenetic relationships of Capsicum frutescens in the Asia-Pacific region: The Pacific dispersal route. International Journal of Historical Archaeology. 29: 72-85. (2024) (Click!!)

5. Sota Koeda*, Chihiro Yamamoto, Hiroto Yamamoto, Kohei Fujishiro, Ryoma Mori, Momoka Okamoto, Atsushi J. Nagano, Takaaki Mashiko. Cy-1, a major QTL for tomato leaf curl New Delhi virus resistance, harbors a gene encoding a DFDGD-Class RNA-dependent RNA polymerase in cucumber (Cucumis sativus). BMC Plant Biology. 24: 879. (2024) (Click!!)

6. Nadya Syafira Pohan, Kanae Okuno, Shoko Okabe, Elly Kesumawati, Sota Koeda*. Pepper yellow leaf curl Aceh virus: a recombinant replacing the parental begomovirus is highly virulent and breaks Ty-1-mediated resistance in tomato. Journal of General Plant Pathology. 90: 333-343. (2024) (Click!!)

7. Yoshiyuki Tanaka, Takahiro Maki, Sota Koeda, Kenichi Matsushima, Sota Yamamoto*. The complete plastid genome of Capsicum frutescens and its phylogenic relationships. Tropical Agriculture and Development. 68:45-48. (2024) (Click!!)

8. Sota Koeda*, Arata Kitawaki. Breakdown of Ty-1-based resistance to tomato yellow leaf curl virus in tomato plants at high temperatures. Phytopathology. 114: 294-303. (2024) (Click!!) 

9. Sota Koeda*, Tomona Noda, Shinkai Hachisu, Akiha Kubo, Yasuto Tanaka, Hiroto Yamamoto, Sayaka Ozaki, Machiko Kinoshita, Kouki Ohno, Yoshiyuki Tanaka, Kenichi Tomi, Yusuke Kamiyoshihara. Expression of alcohol acyltransferase is a potential determinant of fruit volatile ester variations in Capsicum. Plant Cell Reports. 42: 1745-1756. (2023) (Click!!) 

10. Kyohei Kikkawa, Minami Tanaka, Elly Kesumawati, Sota Koeda*. Identification of natural sources of resistance to bipartite begomovirus TYLCKaV in Solanum melongena. Euphytica. 219: 51. (2023) (Click!!)

11. Marina Taniguchi, Ken-Taro Sekine, Sota Koeda*. Lisianthus enation leaf curl virus, a begomovirus new to Japan, is more virulent than the prevalent tomato yellow leaf curl virus in Ty-gene-mediated resistant tomato cultivars. Journal of General Plant Pathology. 89: 35–46. (2023)  (Click!!) (News Release)

12. Nadya Syafira Pohan, Gian Alfan, Munawar Khalil, Putra Bahagia, Rayhan Hayati, Yusuf Haidar, Nurul Hadisah, Mika Onouchi, Ryosuke Shirono, Yoshinori Kohno, Ayane Hamada, Tae Maruishi, Shinkai Hachisu, Kanami Homma, Sabaruddin Zakaria, Elly Kesumawati, Sota Koeda*. Pepper (Capsicum annuum) plants harboring the begomovirus resistance gene pepy-1 show delayed symptom progress and high productivity under the natural field condition. The Horticulture Journal. 92: 36–46. (2023) (Click!!) 

13. Sota Koeda*, Namiko Mori, Ryo Horiuchi, Chiho Watanabe, Atsushi J. Nagano, Hayato Shiragane. PepYLCIV and PepYLCAV resistance gene Pepy-2 encodes DFDGD-Class RNA-dependent RNA polymerase in Capsicum. Theoretical and Applied Genetics. 135: 2437–2452. (2022) (Click!!)

14. Namiko Mori, Shota Hasegawa, Ryota Takimoto, Ryo Horiuchi, Chiho Watanabe, Daiki Onizaki, Hayato Shiragane, Atsushi J. Nagano, Elly Kesumawati, Sota Koeda*. Identification of QTLs conferring resistance to begomovirus isolate of PepYLCIV in Capsicum chinense. Euphytica. 218: 20. (2022) (Click!!) 

15. Sota Koeda*, Mika Onouchi, Namiko Mori, Nadya Syafira Pohan, Atsushi J. Nagano, Elly Kesumawati. A recessive gene pepy-1 encoding Pelota confers resistance to begomovirus isolates of PepYLCIV and PepYLCAV in Capsicum annuum. Theoretical and Applied Genetics. 134: 2947-2964. (2021) (Click!!) (News Release)

16. Hiroto Yamamoto, Yuya Wakita, Toshiya Kitaoka, Kohei Fujishiro, Elly Kesumawati, Sota Koeda*. Southeast Asian isolate of tomato leaf curl New Delhi virus shows higher pathogenicity against tomato and cucurbit crops compared to Mediterranean isolate. The Horticulture Journal. 90: 314-325. (2021) (Click!!)

17. Sota Koeda*, Kanami Homma, Mari Kamitani, Atsushi J. Nagano, Marina Taniguchi, Nadya Pohan, Elly Kesumawati. Pepper vein yellows virus 9: a novel polerovirus species isolated from chili pepper in Indonesia. Archives of Virology. 165: 3017–3021. (2020) (Click!!)

18. Sota Koeda*, Ikuya Fujiwara, Yuki Oka, Elly Kesumawati, Sabaruddin Zakaria, Shinya Kanzaki. Ty-2 and Ty-3a conferred resistance are insufficient against Tomato yellow leaf curl Kanchanaburi virus from Southeast Asia in single or mixed infections of tomato. Plant Disease. 104: 3221-3229. (2020) (Click!!)

19. Shinya Kanzaki*, Asuka Ichihi, Yuta Tanaka, Shiina Fujishige, Sota Koeda, Kosuke Shimizu. The R2R3-MYB transcription factor MiMYB1 regulates light dependent red coloration of ‘Irwin’ mango fruit skin.  Scientia Horticulturae. 272: 109567. (2020) (Click!!)

20. Sota Koeda*, Ryutaro Nakano, Takaya Sawaki, Kosuke Sato, Yoshiyuki Tanaka, Shinya Kanzaki. Multiple non-pungent Capsicum chinense accessions with loss of function CaKR1 allele originating from South America. The Horticulture Journal. 89: 460-465. (2020) (Click!!)

21. Elly Kesumawati*, Shoko Okabe, Munawar Khalil, Gian Alfan, Putra Bahagia, Nadya Pohan, Sabaruddin Zakaria, Sota Koeda. Molecular characterization of begomoviruses associated with yellow leaf curl disease in Solanaceae and Cucurbitaceae crops from Northern Sumatra, Indonesia. The Horticulture Journal. 89: 410-416. (2020) (Click!!)

22. Rihito Takisawa* Sota Koeda,  Tetsuya Nakazaki. Effects of the pat-2 gene and auxin biosynthesis inhibitor on seed production in parthenocarpic tomatoes (Solanum lycopersicum L.). The Horticulture Journal. 88: 481-487. (2019) (Click!!)

23. Shinya Kanzaki*, Shiori Kamikawa, Asuka Ichihi, Yuta Tanaka, Kosuke Shimizu, Sota Koeda, Naoki Utsunomiya. Isolation of UDP:flavonoid 3-O-glycosyltransferase (UFGT)-like genes and expression analysis of genes associated with anthocyanin accumulation in mango ‘Irwin’ skin. The Horticulture Journal. 88: 435-443. (2019) (Click!!)

24. Elly Kesumawati, Shoko Okabe, Kanami Homma, Ikuya Fujiwara, Sabaruddin Zakaria, Shinya Kanzaki, Sota Koeda*.  Pepper yellow leaf curl Aceh virus: a novel bipartite begomovirus isolated from chili pepper, tomato, and tobacco plants in Indonesia. Archives of Virology. 164: 2379-2383. (2019) (Click!!)

25. Sota Koeda*, Ikuya Fujiwara. A simple DNA extraction method for begomovirus detection and genotyping of host plant. Tropical Agriculture and Development. 63: 34-37. (2019) (Click!!)

26. Sota Koeda*, Kosuke Sato, Hiroki Saito, Atsushi J. Nagano, Masaki Yasugi, Hiroshi Kudoh, Yoshiyuki Tanaka. Mutation in the putative ketoacyl-ACP reductase CaKR1 induces loss of pungency in Capsicum. Theoretical and Applied Genetics. 132: 65-80. (2019) (Click!!)

27. Sota Koeda*, Shotaro Matsumoto, Yuki Matsumoto, Rihito Takisawa, Koji Nishikawa, Keiko Kataoka. Medium-term in vitro conservation of virus-free parthenocarpic tomato plants. In Vitro Cellular & Developmental Biology - Plant. 54: 392-398. (2018) (Click!!)

28. Sota Koeda*, Kanami Homma, Yuri Tanaka, Daiki Onizaki, Elly Kesumawati, Sabaruddin Zakaria, Shinya Kanzaki. Inoculation of capsicums with Pepper yellow leaf curl Indonesia virus by combining agroinoculation and grafting. The Horticulture Journal. 87: 364-371. (2018) (Click!!)

29. Yoshiyuki Tanaka*, Shiho Fukuta, Sota Koeda, Tanjuro Goto, Yuichi Yoshida, Ken-ichiro Yasuba. Identification of a novel mutant pAMT allele responsible for low-pungency and capsinoid production in chili pepper accession 'No.4034' (Capsicum chinense). The Horticulture Journal. 87: 222-228. (2018) (Click!!)

30. Rihito Takisawa*, Takayuki Maruyama, Tetsuya Nakazaki, Keiko Kataoka, Hiroki Saito, Sota Koeda, Tsukasa Nunome, Hiroyuki Fukuoka, Akira Kitajima. Parthenocarpy in the tomato (Solanum lycopersicum L.) cultivar ‘MPK-1’ is controlled by a novel parthenocarpic gene. The Horticulture Journal. 86: 487-492. (2017) (Click!!)

31. Sota Koeda*, Kanami Homma, Yuri Tanaka, Elly Kesumawati, Sabaruddin Zakaria, Shinya Kanzaki. Highly efficient agroinoculation method for tomato plants with Tomato yellow leaf curl Kanchanaburi virus. The Horticulture Journal. 86: 479-486. (2017) (Click!!)

32. Masaru Matsuda, Toshio Sakakibara, Keisuke Katsura, Sota Koeda*. Prediction of the number of cut flowers in Anthurium andraeanum L. using a simulation model. Horticultural research (Japan). 15: 425-431. (2016) (Click!!)

33. Xi Li, Akira Kitajima*, Keisuke Katsura, Hiroki Saito, Sota Koeda, Rihito Takisawa, Takashi Kawai, Tetsuya Nakazaki, Tokurou Shimizu. Cell wall related gene expression during secondary physiological fruit drop in ponkan (Citrus reticulata Blanco) and hyuganatsu (C. tamurana hort. ex Tanaka). Acta Horticulturae. 1135. (2016) (Click!!)

34. Li Liu, Jelli Venkatesh, Yeong Deuk Jo, Sota Koeda, Munetaka Hosokawa, Jin-Ho Kang, Sandra Goritschnig, Byoung-Cheorl Kang*. Fine mapping and identification of candidate genes for the sy-2 locus in a temperature-sensitive chili pepper (Capsicum chinense). Theoretical and Applied Genetics. 129: 1541-1556. (2016) (Click!!)

35. Iraklis Boubourakas, Hiroko Kanda, Tomoyuki Nabeshima, Mayu Onda, Nao Ota, Sota Koeda, Munetaka Hosokawa*. Digestion of chrysanthemum stunt viroid by leaf extracts of Capsicum chinense indicates strong RNA-digesting activity. Plant Cell Reports. 35: 1617-1628. (2016) (Click!!)

36. Sota Koeda*, Elly Kesumawati, Yuri Tanaka, Munetaka Hosokawa, Motoaki Doi, Akira Kitajima. Mixed infection of begomoviruses on pepper plants at northern Sumatra, Indonesia. Tropical Agriculture and Development. 60: 59-64. (2016) (Click!!)

37. Yoshiyuki Tanaka*, Tomomi Sonoyama, Yuji Muraga, Sota Koeda, Tanjuro Goto, Yuichi Yoshida, Kenichiro Yasuba. Multiple loss-of-function putative aminotransferase alleles contribute to low pungency and capsinoid biosynthesis in Capsicum chinense. Molecular Breeding. 35: 142. (2015) (Click!!)

38. Sota Koeda*, Kosuke Sato, Yuri Tanaka, Rihito Takisawa, Akira Kitajima. A Comt1 loss of function mutation is insufficient for loss of pungency in Capsicum. American Journal of Plant Sciences. 6: 1243-1255. (2015) (Click!!)

39. Sota Koeda*, Rihito Takisawa, Tomoyuki Nabeshima, Yuri Tanaka, Akira Kitajima. Production of Tomato yellow leaf curl virus-free parthenocarpic tomato plants by leaf primordia-free shoot apical meristem culture combined with in vitro grafting. The Horticulture Journal. 84: 327-333. (2015) (JSHS Excellent paper award) (Click!!)

40. Sota Koeda*, Kosuke Sato, Rihito Takisawa, Akira Kitajima. Inheritance of the non-pungency in ‘No.3341’ (Capsicum chinense). The Horticulture Journal. 84: 323-326. (2015) (Click!!)

41. Sota Koeda*, Kosuke Sato, Kenichi Tomi, Yoshiyuki Tanaka, Rihito Takisawa, Munetaka Hosokawa, Motoaki Doi, Tetsuya Nakazaki, Akira Kitajima. Analysis of non-pungency, aroma, and origin of a Capsicum chinense cultivar from a Caribbean island. Journal of the Japanese Society for Horticultural Science. 83: 244-251. (2014) (JSHS Excellent paper award) (Click!!)

42. Sota Koeda*, Munetaka Hosokawa, Hiroki Saito, Motoaki Doi. Temperature-sensitive phenotype caused by natural mutation in Capsicum latescent in two tropical regions. Journal of Plant Research. 126: 675-684. (2013) (Click!!)

43. Munetaka Hosokawa*, Takayoshi Yamauchi, Masayoshi Takahama, Mariko Goto, Sachiko Mikano, Yuki Yamaguchi, Yoshiyuki Tanaka, Sho Ohno, Sota Koeda, Motoaki Doi, Susumu Yazawa. Phosphorus starvation induces post-transcriptional CHS gene silencing in Petunia corolla. Plant Cell Reports. 32: 601-609. (2013) (Click!!)

44. Sota Koeda, Munetaka Hosokawa*, Byoung-Cheorl Kang, Chihiro Tanaka, Doil Choi, Satoshi Sano, Takashi Shiina, Motoaki Doi, Susumu Yazawa. Defense response of a pepper cultivar cv. Sy-2 is induced at temperatures below 24°C. Journal of Plant Research. 125: 137-145. (2012) (Click!!)

45. Song-Ji An, Devendra Pandeya, Soung-Woo Park, Jinjie Li, Jin-Kyung Kwon, Sota Koeda, Munetaka Hosokawa, Nam-Chon Paek, Doil Choi, Byoung-Cheorl Kang*. Characterization and genetic analysis of a low-temperature-sensitive mutant, sy-2, in Capsicum chinense. Theoretical and Applied Genetics. 122: 459-470. (2011) (Click!!)

46. Sota Koeda, Akane Takezaki, Yuki Isomura, Susumu Yazawa*. Developmental abnormality of a local pepper cultivar (Capsicum chinense) from the Seychelles below 24ºC. Bulletin of Experimental Farm Kyoto University. 19:15-20. (2010) (Click!!)

47. Sota Koeda, Munetaka Hosokawa*, Byoung-Cheorl Kang, Susumu Yazawa. Dramatic changes in leaf development of the native Capsicum chinense from the Seychelles at temperatures below 24ºC. Journal of Plant Research. 122: 623-631. (2009) (Click!!)

         *:Corresponding author

• Grants-in-Aid for Scientific Research (JSPS), Scientific Research (B) (2022-2025Principal Researcher: Sota Yamamoto)

• Grants-in-Aid for Scientific Research (JSPS), Fostering Joint International Research (B)  (2021-2025 Principal Researcher: Sota Koeda)

• Sponsored Research, Takii Seeds (2021, Principal Researcher: Sota Koeda)

• Sponsored Research, Takii Seeds (2020, Principal Researcher: Sota Koeda)

• Sponsored Research, Takii Seeds (2019, Principal Researcher: Sota Koeda)

• Grants-in-Aid for Scientific Research (JSPS), Scientific Research (B) (2019-2022 Principal Researcher: Sota Koeda)

• Sponsored Research, Takii Seeds (2018, Principal Researcher: Sota Koeda)

• Grants-in-Aid for Scientific Research (JSPS), Scientific Research (B) (2018-2021Principal Researcher: Sota Yamamoto)

• Agriculture, Forestry and Fisheries Research Council, grant,  (2018, Principal Researcher: Junichi Sakagami)

• Grants-in-Aid for Scientific Research (Faculty of Agriculture, Kindai University) (2017, Principal Researcher: Sota Koeda)

• Sponsored Research, Takii Seeds (2016-2017, Principal Researcher: Sota Koeda)

• Agriculture, Forestry and Fisheries Research Council, grant,  (2016, Principal Researcher: Junichi Sakagami)

• Grants-in-Aid for Scientific Research (JSPS), Scientific Research (C) (2016-2018, Principal Researcher: Sota Koeda)

• JSPS(Japan) - DG-RSTHE(Indonesia) Joint Research Program (2016-2018, Principal Researcher: Sota Koeda)

• Kyoto University Research Grant (Ishizue) (2014, Principal Researcher: Sota Koeda)

• Grants-in-Aid for Scientific Research (JSPS), Scientific Research (B) (2013-2014Principal Researcher: Akira Kitajima)

• Grants-in-Aid for Scientific Research (JSPS), Grant-in-Aid for Young Scientists (B) (2013-2015, Principal Researcher: Sota Koeda)

• Kyoto University Research Grant (Start-up) (2012, Principal Researcher: Sota Koeda)

• Grants-in-Aid for Scientific Research (JSPS), Scientific Research (B) (2012, Principal Researcher: Munetaka Hosokawa)

• Grants-in-Aid for Scientific Research (JSPS), Grant-in-Aid for JSPS Fellows (2009-2010, Principal Researcher: Sota Koeda)

Kindai University, Laboratory of Horticultural Science

3327-204 Nakamachi, Nara City, Nara 631-8505, Japan

TEL: +81-742-43-3703

E-mail: 818sota"@"nara.kindai.ac.jp  ("@"→@)