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The inhibition of SlIAA9 mimics an increase in endogenous auxin and mediates changes in auxin and gibberellin signalling during parthenocarpic fruit development in tomato.
J Plant Physiol. 2020 Sep; 252:153238.JP

Abstract

Parthenocarpic fruit formation can be achieved through the inhibition of SlIAA9, a negative regulator of auxin signalling in tomato plant. During early fruit development under SlIAA9 inhibition, cell division and cell expansion were observed. Bioactive gibberellin (GA) accumulated, but indole-3-acetic acid (IAA) and trans-zeatin did not accumulate substantially. Furthermore, under SlIAA9 inhibition, auxin-responsive genes such as SlIAA2, -3, and -14 were upregulated, and SlARF7 was downregulated. These results indicate that SlIAA9 inhibition mimics an increase in auxin. The auxin biosynthesis genes SlTAR1, ToFZY, and ToFZY5 were stimulated by an increase in auxin and by auxin mimicking under SlIAA9 inhibition. However, SlTAR2 and ToFZY2 were upregulated only by pollination followed by high IAA accumulation. These results suggest that SlTAR2 and ToFZY2 play an important role in IAA synthesis in growing ovaries. GA synthesis was also activated by SlIAA9 inhibition through both the early-13-hydroxylation (for GA1 synthesis) and non-13-hydroxylation (GA4) pathways, indicating that fruit set caused by SlIAA9 inhibition was partially mediated by the GA pathway. SlIAA9 inhibition induced the expression of GA inactivation genes as well as GA biosynthesis genes except SlCPS during early parthenocarpic fruit development in tomato. This result suggests that inactivation genes play a role in fine-tuning the regulation of bioactive GA accumulation.

Authors+Show Affiliations

Faculty of Life and Environmental Sciences, University of Tsukuba, Tennodai 1-1-1 Tsukuba, Ibaraki 305-8572, Japan; Department of Environmental Horticulture, The University of Seoul, Seoulsiripdae‑ro 163, Dongdaemun‑gu, Seoul 130‑743, South Korea.Faculty of Life and Environmental Sciences, University of Tsukuba, Tennodai 1-1-1 Tsukuba, Ibaraki 305-8572, Japan.Faculty of Life and Environmental Sciences, University of Tsukuba, Tennodai 1-1-1 Tsukuba, Ibaraki 305-8572, Japan; Department of Environmental Horticulture, The University of Seoul, Seoulsiripdae‑ro 163, Dongdaemun‑gu, Seoul 130‑743, South Korea.RIKEN Center for Sustainable Resource Science, 1-7-22, Suehiro, Tsurumi, Yokohama 230-0045, Japan.RIKEN Center for Sustainable Resource Science, 1-7-22, Suehiro, Tsurumi, Yokohama 230-0045, Japan.RIKEN Center for Sustainable Resource Science, 1-7-22, Suehiro, Tsurumi, Yokohama 230-0045, Japan; Graduate School of Bioagricultural Sciences, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan.Faculty of Life and Environmental Sciences, University of Tsukuba, Tennodai 1-1-1 Tsukuba, Ibaraki 305-8572, Japan; Tsukuba Plant Innovation Research Center, University of Tsukuba, Tennodai 1-1-1, Tsukuba, Ibaraki, 305-8572, Japan.Faculty of Life and Environmental Sciences, University of Tsukuba, Tennodai 1-1-1 Tsukuba, Ibaraki 305-8572, Japan; Tsukuba Plant Innovation Research Center, University of Tsukuba, Tennodai 1-1-1, Tsukuba, Ibaraki, 305-8572, Japan. Electronic address: ezura.hiroshi.fa@u.tsukuba.ac.jp.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

32707453

Citation

Kim, Ji-Seong, et al. "The Inhibition of SlIAA9 Mimics an Increase in Endogenous Auxin and Mediates Changes in Auxin and Gibberellin Signalling During Parthenocarpic Fruit Development in Tomato." Journal of Plant Physiology, vol. 252, 2020, p. 153238.
Kim JS, Ezura K, Lee J, et al. The inhibition of SlIAA9 mimics an increase in endogenous auxin and mediates changes in auxin and gibberellin signalling during parthenocarpic fruit development in tomato. J Plant Physiol. 2020;252:153238.
Kim, J. S., Ezura, K., Lee, J., Kojima, M., Takebayashi, Y., Sakakibara, H., Ariizumi, T., & Ezura, H. (2020). The inhibition of SlIAA9 mimics an increase in endogenous auxin and mediates changes in auxin and gibberellin signalling during parthenocarpic fruit development in tomato. Journal of Plant Physiology, 252, 153238. https://doi.org/10.1016/j.jplph.2020.153238
Kim JS, et al. The Inhibition of SlIAA9 Mimics an Increase in Endogenous Auxin and Mediates Changes in Auxin and Gibberellin Signalling During Parthenocarpic Fruit Development in Tomato. J Plant Physiol. 2020;252:153238. PubMed PMID: 32707453.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - The inhibition of SlIAA9 mimics an increase in endogenous auxin and mediates changes in auxin and gibberellin signalling during parthenocarpic fruit development in tomato. AU - Kim,Ji-Seong, AU - Ezura,Kentaro, AU - Lee,Jeongeun, AU - Kojima,Mikkiko, AU - Takebayashi,Yumiko, AU - Sakakibara,Hitoshi, AU - Ariizumi,Tohru, AU - Ezura,Hiroshi, Y1 - 2020/07/16/ PY - 2020/04/16/received PY - 2020/06/16/revised PY - 2020/07/09/accepted PY - 2020/7/25/pubmed PY - 2021/3/2/medline PY - 2020/7/25/entrez KW - Auxin KW - Gibberellin KW - Parthenocarpy KW - SlIAA9 KW - Solanum lycopersicum L. SP - 153238 EP - 153238 JF - Journal of plant physiology JO - J Plant Physiol VL - 252 N2 - Parthenocarpic fruit formation can be achieved through the inhibition of SlIAA9, a negative regulator of auxin signalling in tomato plant. During early fruit development under SlIAA9 inhibition, cell division and cell expansion were observed. Bioactive gibberellin (GA) accumulated, but indole-3-acetic acid (IAA) and trans-zeatin did not accumulate substantially. Furthermore, under SlIAA9 inhibition, auxin-responsive genes such as SlIAA2, -3, and -14 were upregulated, and SlARF7 was downregulated. These results indicate that SlIAA9 inhibition mimics an increase in auxin. The auxin biosynthesis genes SlTAR1, ToFZY, and ToFZY5 were stimulated by an increase in auxin and by auxin mimicking under SlIAA9 inhibition. However, SlTAR2 and ToFZY2 were upregulated only by pollination followed by high IAA accumulation. These results suggest that SlTAR2 and ToFZY2 play an important role in IAA synthesis in growing ovaries. GA synthesis was also activated by SlIAA9 inhibition through both the early-13-hydroxylation (for GA1 synthesis) and non-13-hydroxylation (GA4) pathways, indicating that fruit set caused by SlIAA9 inhibition was partially mediated by the GA pathway. SlIAA9 inhibition induced the expression of GA inactivation genes as well as GA biosynthesis genes except SlCPS during early parthenocarpic fruit development in tomato. This result suggests that inactivation genes play a role in fine-tuning the regulation of bioactive GA accumulation. SN - 1618-1328 UR - https://www.unboundmedicine.com/medline/citation/32707453/The_inhibition_of_SlIAA9_mimics_an_increase_in_endogenous_auxin_and_mediates_changes_in_auxin_and_gibberellin_signalling_during_parthenocarpic_fruit_development_in_tomato_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0176-1617(20)30128-0 DB - PRIME DP - Unbound Medicine ER -