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Title of Journal: Plant Mol Biol

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Abbravation: Plant Molecular Biology

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Kluwer Academic Publishers

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DOI

10.1016/0006-8993(90)90983-i

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ISSN

1573-5028

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Transgenic cotton overproducing spinach sucrose p

Authors: Candace H Haigler Bir Singh Deshui Zhang Sangjoon Hwang Chunfa Wu Wendy X Cai Mohamed Hozain Wonhee Kang Brett Kiedaisch Richard E Strauss Eric F Hequet Bobby G Wyatt Gay M Jividen A Scott Holaday
Publish Date: 2007/02/08
Volume: 63, Issue: 6, Pages: 815-832
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Abstract

Prior data indicated that enhanced availability of sucrose a major product of photosynthesis in source leaves and the carbon source for secondary wall cellulose synthesis in fiber sinks might improve fiber quality under abiotic stress conditions To test this hypothesis a family of transgenic cotton plants Gossypium hirsutum cv Coker 312 elite was produced that overexpressed spinach sucrosephosphate synthase SPS because of its role in regulation of sucrose synthesis in photosynthetic and heterotrophic tissues A family of 12 independent transgenic lines was characterized in terms of foreign gene insertion expression of spinach SPS production of spinach SPS protein and development of enhanced extractable V max SPS activity in leaf and fiber Lines with the highest V max SPS activity were further characterized in terms of carbon partitioning and fiber quality compared to wildtype and transgenic null controls Leaves of transgenic SPS overexpressing lines showed higher sucrosestarch ratio and partitioning of 14C to sucrose in preference to starch In two growth chamber experiments with cool nights ambient CO2 concentration and limited light below the canopy the transgenic line with the highest SPS activity in leaf and fiber had higher fiber micronaire and maturity ratio associated with greater thickness of the cellulosic secondary wall

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