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Hasegawa S, Tsutsumi T, Fukushima S, Okabe Y, Saito J, Katayama M, Shindo M, Yamada Y, Shimomura K, Yoneyama K, Akiyama K, Aoki K, Ariizumi T, Ezura H, Yamaguchi S, Umehara M. Low Infection of Phelipanche aegyptiaca in Micro-Tom Mutants Deficient in CAROTENOIDCLEAVAGE DIOXYGENASE 8. Int J Mol Sci 2018; 19:E2645. [PMID: 30200620 PMCID: PMC6163878 DOI: 10.3390/ijms19092645] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2018] [Revised: 09/01/2018] [Accepted: 09/04/2018] [Indexed: 12/02/2022] Open
Abstract
Strigolactones (SLs), a group of plant hormones, induce germination of root-parasitic plants and inhibit shoot branching in many plants. Shoot branching is an important trait that affects the number and quality of flowers and fruits. Root-parasitic plants, such as Phelipanche spp., infect tomato roots and cause economic damage in Europe and North Africa-hence why resistant tomato cultivars are needed. In this study, we found carotenoid cleavage dioxygenase 8-defective mutants of Micro-Tom tomato (slccd8) by the "targeting induced local lesions in genomes" (TILLING) method. The mutants showed excess branching, which was suppressed by exogenously applied SL. Grafting shoot scions of the slccd8 mutants onto wild-type (WT) rootstocks restored normal branching in the scions. The levels of endogenous orobanchol and solanacol in WT were enough detectable, whereas that in the slccd8 mutants were below the detection limit of quantification analysis. Accordingly, root exudates of the slccd8 mutants hardly stimulated seed germination of root parasitic plants. In addition, SL deficiency did not critically affect the fruit traits of Micro-Tom. Using a rhizotron system, we also found that Phelipanche aegyptiaca infection was lower in the slccd8 mutants than in wild-type Micro-Tom because of the low germination. We propose that the slccd8 mutants might be useful as new tomato lines resistant to P. aegyptiaca.
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Affiliation(s)
- Shoko Hasegawa
- Graduate School of Life Sciences, Toyo University, Itakura-machi, Ora-gun, Gunma 374-0193, Japan.
| | - Takuya Tsutsumi
- Department of Applied Biosciences, Toyo University, Itakura-machi, Ora-gun, Gunma 374-0193, Japan.
| | - Shunsuke Fukushima
- Department of Applied Biosciences, Toyo University, Itakura-machi, Ora-gun, Gunma 374-0193, Japan.
| | - Yoshihiro Okabe
- Faculty of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8572, Japan.
- Tsukuba Plant Innovation Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8572, Japan.
| | - Junna Saito
- Graduate School of Life and Environmental Sciences, Osaka Prefecture University, Naka-ku, Sakai, Osaka 599-8531, Japan.
| | - Mina Katayama
- College of Life, Environment, and Advanced Sciences, Osaka Prefecture University, Naka-ku, Sakai, Osaka 599-8531, Japan.
| | - Masato Shindo
- Graduate School of Life Sciences, Toyo University, Itakura-machi, Ora-gun, Gunma 374-0193, Japan.
| | - Yusuke Yamada
- Graduate School of Life Sciences, Toyo University, Itakura-machi, Ora-gun, Gunma 374-0193, Japan.
| | - Koichiro Shimomura
- Graduate School of Life Sciences, Toyo University, Itakura-machi, Ora-gun, Gunma 374-0193, Japan.
| | - Kaori Yoneyama
- Graduate School of Agriculture, Ehime University, Matsuyama, Ehime 790-8566, Japan.
- Precursory Research for Embryonic Science and Technology (PRESTO), Japan Science and Technology Agency, Kawaguchi, Saitama 332-0012, Japan.
| | - Kohki Akiyama
- Graduate School of Life and Environmental Sciences, Osaka Prefecture University, Naka-ku, Sakai, Osaka 599-8531, Japan.
| | - Koh Aoki
- Graduate School of Life and Environmental Sciences, Osaka Prefecture University, Naka-ku, Sakai, Osaka 599-8531, Japan.
| | - Tohru Ariizumi
- Faculty of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8572, Japan.
- Tsukuba Plant Innovation Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8572, Japan.
| | - Hiroshi Ezura
- Faculty of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8572, Japan.
- Tsukuba Plant Innovation Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8572, Japan.
| | - Shinjiro Yamaguchi
- Graduate School of Life Sciences, Tohoku University, Katahira, Aoba-ku, Sendai 980-8577, Japan.
| | - Mikihisa Umehara
- Graduate School of Life Sciences, Toyo University, Itakura-machi, Ora-gun, Gunma 374-0193, Japan.
- Department of Applied Biosciences, Toyo University, Itakura-machi, Ora-gun, Gunma 374-0193, Japan.
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