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The Ohio State University

1. Wu, Shan. <i>SUN</i> REGULATES FRUIT SHAPE AND VEGETATIVE GROWTH IN TOMATO.

Degree: MS, Horticulture and Crop Science, 2009, The Ohio State University

The <i>SUN</i> gene, located on tomato (<i>Solanum lycopersicum</i>) chromosome 7, controls elongated fruit shape. Cell measurement on 7-day-post-anthesis fruits of Near Isogenic lines (NILs) that differ at <i>sun</i> locus in LA1589 background shows that <i>SUN</i> promotes the elongated shape through redistributing the mass. To further study the role of <i>SUN</i> in regulating fruit shape, we investigated the localization of <i>SUN</i> in young developing ovaries and fruits of <i>sun</i> NILs by <i>in situ</i> hybridization. Consistent with the result of previous expression analysis, <i>SUN</i> transcript is present in the elongated ovaries and fruits but not in the round ones. The extremely elongated fruit shape and lack of seeds when <i>SUN</i> is overexpressed resemble the parthenocarpic fruits caused by auxin overproduction. To better understand its role in regulating plant growth, we studied the effects of <i>SUN</i> on vegetative plant parts using <i>sun</i> NILs and <i>SUN</i> overexpressing lines in both wild tomato <i>S. pimpinellifolium</i> accession LA1589 and cultivated tomato Sun1642. Our results show that, in addition to fruit shape, <i>SUN</i> also underlies morphological variations of cotyledons, leaves and vascular structure as well as non-fixed directional twisting of stem and leaf rachis. Moreover, overexpression of <i>SUN</i> leads to a magnified effect of this gene on plant morphology. <i>SUN</i> overexpressors also display reduced rhizogenesis in response to exogenous auxin. The observed phenotypes suggest that <i>SUN</i> may play roles in auxin response and/or transport. However, the expression analysis of several auxin-related genes using Northern blot did not show a clear difference in the temporal expression patterns between the NILs. <i>In situ</i> hybridization of two auxin response factor genes, <i>ARF6</i> and <i>ARF8</i> and a gene encoding PIN3-like auxin transport protein indicates that they are co-expressed with <i>SUN</i> in the seed and vascular tissue, but there is no distinct difference between the elongated and the round fruit, which suggests that <i>SUN</i> does not regulate the expression of these genes. This suggestion is supported by the subcellular localization study on SUN which shows that SUN is not localized in the cell nucleus. Advisors/Committee Members: van der Knaap, Esther (Advisor).

Subjects/Keywords: Tomato (<; i>; Solanum lycopersicum<; /i>; ); <; i>; SUN<; /i>;

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APA (6th Edition):

Wu, S. (2009). <i>SUN</i> REGULATES FRUIT SHAPE AND VEGETATIVE GROWTH IN TOMATO. (Masters Thesis). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1250473979

Chicago Manual of Style (16th Edition):

Wu, Shan. “<i>SUN</i> REGULATES FRUIT SHAPE AND VEGETATIVE GROWTH IN TOMATO.” 2009. Masters Thesis, The Ohio State University. Accessed September 19, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1250473979.

MLA Handbook (7th Edition):

Wu, Shan. “<i>SUN</i> REGULATES FRUIT SHAPE AND VEGETATIVE GROWTH IN TOMATO.” 2009. Web. 19 Sep 2019.

Vancouver:

Wu S. <i>SUN</i> REGULATES FRUIT SHAPE AND VEGETATIVE GROWTH IN TOMATO. [Internet] [Masters thesis]. The Ohio State University; 2009. [cited 2019 Sep 19]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1250473979.

Council of Science Editors:

Wu S. <i>SUN</i> REGULATES FRUIT SHAPE AND VEGETATIVE GROWTH IN TOMATO. [Masters Thesis]. The Ohio State University; 2009. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1250473979

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