PJB-2010-185
EXPRESSION OF A SESAME GERANYLGERANYL REDUCTASE cDNA IS INDUCED BY LIGHT BUT REPRESSED BY ABSCISIC ACID AND ETHYLENE
MYOUNG RYOUL PARK1, EUN AE CHO2, SHAFIQ REHMAN3 AND SONG JOONG YUN1,2*
Abstract
Geranylgeranyl reductase (CHL P) is localized in plastids and catalyzes the reduction of geranylgeranyl diphosphate to phytyl diphosphate, a molecule required for both tocopherol and chlorophyll biosyntheses. To understand the regulation of Chl P expression in sesame, a Chl P cDNA (SiChlP) was isolated and the effects of light and phytohormones on SiChl P expression was investigated. The putative SiChl P cDNA was 1,633 bp and included a 1,394 bp open reading frame encoding a polypeptide of 465 amino acid residues. SiChl P mRNA was expressed most abundantly in leaves and cotyledons, moderately in developing capsules and seeds, but little in flowers, hypocotyls and roots of healthy seedlings and plants. Expression of SiChl P in a cotyledon was induced by light, but the level of induction was higher in red light than in far-red or blue light. However, SiChl P expression was diminished by dark, ethylene and abscisic acid.
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