alexa Expression of alpha-expansin and expansin-like genes in deepwater rice.


Journal of Plant Biochemistry & Physiology

Author(s): Lee Y, Kende H

Abstract Share this page

Abstract Previously, we have studied the expression and regulation of four alpha- and 14 beta-expansin genes in deepwater rice (Oryza sativa). We now report on the structure, expression, and regulation of 22 additional alpha-expansin (Os-EXP) genes, four expansin-like (Os-EXPL) genes, and one expansin-related (Os-EXPR) gene, which have recently been identified in the expressed sequence tag and genomic databases of rice. Alpha-expansins are characterized by a series of conserved Cys residues in the N-terminal half of the protein, a histidine-phenylalanine-aspartate (HFD) motif in the central region, and a series of tryptophan residues near the carboxyl terminus. Of the 22 additional alpha-expansin genes, five are expressed in internodes and leaves, three in coleoptiles, and nine in roots, with high transcript levels in the growing regions of these organs. Transcripts of five alpha-expansin genes were found in roots only. Expression of five alpha-expansin genes was induced in the internode by treatment with gibberellin (GA) and by wounding. The wound response resulted from excising stem sections or from piercing pinholes into the stem of intact plants. EXPL proteins lack the HFD motif and have two additional Cys residues in their C- and N-terminal regions. The positions of conserved tryptophan residues at the C-terminal region are different from those of alpha- and beta-expansins. Expression of the Os-EXPL3 gene is correlated with elongation and slightly induced by applied GA. However, the expression of the Os-EXPL1 and Os-EXPL2 genes showed limited correlation with cell elongation and was not induced by GA. We found no expression of the Os-EXPR1 gene in the organs examined.
This article was published in Plant Physiol and referenced in Journal of Plant Biochemistry & Physiology

Relevant Expert PPTs

Relevant Speaker PPTs

Recommended Conferences

  • 3rd Global Summit on Plant Science
    August 07-09, 2017 Rome, Italy
  • 2nd International Conference on Biochemistry
    Sep 21-22, 2017 Macau, Hong Kong

Relevant Topics

Peer Reviewed Journals
Make the best use of Scientific Research and information from our 700 + peer reviewed, Open Access Journals
International Conferences 2017-18
Meet Inspiring Speakers and Experts at our 3000+ Global Annual Meetings

Contact Us

© 2008-2017 OMICS International - Open Access Publisher. Best viewed in Mozilla Firefox | Google Chrome | Above IE 7.0 version