Constitutive expression of mustard annexin, AnnBj1 enhances abiotic stress tolerance and fiber quality in cotton under stress.
Annexins belong to a multigene family of Ca(2+) dependent, phospholipid and cytoskeleton binding proteins. They have been shown to be upregulated under various stress conditions. We generated transgenic cotton plants expressing mustard annexin (AnnBj1), which showed enhanced tolerance towards different abiotic stress treatments like sodium chloride, mannitol, polyethylene glycol and hydrogen peroxide. The tolerance to these treatments was associated with decreased hydrogen peroxide levels and enhanced total peroxidase activity, enhanced content of osmoprotectants- proline and sucrose in transgenic plants. They showed higher retention of total chlorophyll and reduced TBARS in leaf disc assays with stress treatments, and decreased hydrogen peroxide accumulation in the stomatal guard cells when compared to their wild type counterparts. They also showed significantly enhanced fresh weight, relative water content, dry weight under stress. Treatment with sodium chloride resulted in enhanced expression of genes for Delta-pyrroline-5-carboxylase synthetase in leaves, and sucrose phosphate synthase, sucrose synthase and cellulose synthase A in the leaves and fibers of transgenic plants. The transgenic plants maintained normal seed development, fiber quality and cellulose content under stress.
Department of Plant Sciences, University of Hyderabad, Hyderabad, India.
Kesanakurti
K
Divya
S K
SK
Jami
P B
PB
Kirti
D000222:Adaptation, Physiological / Q000187:drug effects / Q000235:genetics / Q000502:physiology; D000595:Amino Acid Sequence; D017302:Annexins / Q000145:classification / Q000235:genetics*; D002734:Chlorophyll / Q000378:metabolism; D032561:Cotton Fiber / Q000592:standards*; D018506:Gene Expression Regulation, Plant; D005964:Glucosyltransferases / Q000235:genetics; D003368:Gossypium / Q000235:genetics* / Q000378:metabolism / Q000502:physiology; D006861:Hydrogen Peroxide / Q000378:metabolism; D008353:Mannitol / Q000494:pharmacology; D008969:Molecular Sequence Data; D009149:Mustard Plant / Q000235:genetics*; D009195:Peroxidase / Q000378:metabolism; D010802:Phylogeny; D018515:Plant Leaves / Q000235:genetics / Q000378:metabolism / Q000502:physiology; D010940:Plant Proteins / Q000145:classification / Q000235:genetics*; D030821:Plants, Genetically Modified; D020133:Reverse Transcriptase Polymerase Chain Reaction; D017386:Sequence Homology, Amino Acid; D012965:Sodium Chloride / Q000494:pharmacology; D017392:Thiobarbituric Acid Reactive Substances / Q000378:metabolism
D017302:Annexins; D010940:Plant Proteins; D017392:Thiobarbituric Acid Reactive Substances; D002734:Chlorophyll; D008353:Mannitol; D012965:Sodium Chloride; D006861:Hydrogen Peroxide; D009195:Peroxidase; D005964:Glucosyltransferases; C478648:cellulose synthase; C022699:sucrose synthase