Plant Molecular Biology

, Volume 63, Issue 6, pp 815–832

Transgenic cotton over-producing spinach sucrose phosphate synthase showed enhanced leaf sucrose synthesis and improved fiber quality under controlled environmental conditions

  • 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
Original Paper

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 (Gossypiumhirsutum cv. Coker 312 elite) was produced that over-expressed spinach sucrose-phosphate 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 Vmax SPS activity in leaf and fiber. Lines with the highest Vmax SPS activity were further characterized in terms of carbon partitioning and fiber quality compared to wild-type and transgenic null controls. Leaves of transgenic SPS over-expressing lines showed higher sucrose:starch 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.

Keywords

Carbon partitioning Cotton fiber quality Environmental stress Sucrose, starch, and cellulose metabolism Transgenic cotton 

Abbreviations

AFIS

Advanced Fiber Information System

DPA

Days post anthesis

ELISA

Enzyme-linked immunosorbent assay

HVI

High-Volume Instrumentation

IFC %

Immature fiber content expressed as a percent

KS

Kanamycin sensitive transgenic null line

npt II

Gene for neomycin phosphotransferase conferring kanamycin resistance

PFD

Photon flux density

SFC %

Short fiber content expressed as a percent

SPS

Sucrose phosphate synthase

SPS+

Transgenic cotton lines over-expressing spinach sucrose phosphate synthase

T0-4

Generations of transgenic plants, with T0 being primary transformants and numbers representing further seed-propagated generations

WT

Wild-type

Copyright information

© Springer Science+Business Media B.V. 2007

Authors and Affiliations

  • Candace H. Haigler
    • 1
  • Bir Singh
    • 1
  • Deshui Zhang
    • 2
  • Sangjoon Hwang
    • 3
  • Chunfa Wu
    • 4
  • Wendy X. Cai
    • 5
  • Mohamed Hozain
    • 5
  • Wonhee Kang
    • 6
  • Brett Kiedaisch
    • 7
  • Richard E. Strauss
    • 5
  • Eric F. Hequet
    • 8
  • Bobby G. Wyatt
    • 8
  • Gay M. Jividen
    • 9
  • A. Scott Holaday
    • 5
  1. 1.Department of Crop Science and Department of Plant BiologyNorth Carolina State UniversityRaleighUSA
  2. 2.Ventria BioscienceSacramentoUSA
  3. 3.R&D DepartmentDigital Genomics (Inc.)SeoulKorea
  4. 4.Livestock Issue Research UnitUSDA-ARSLubbockUSA
  5. 5.Department of Biological SciencesTexas Tech UniversityLubbockUSA
  6. 6.Department of HorticultureKangwon National UniversityChunchonKorea
  7. 7.HealthPoint, Ltd.Fort WorthUSA
  8. 8.International Textile CenterTexas Tech UniversityLubbockUSA
  9. 9.Cotton IncorporatedCaryUSA

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