Abstract
The phytohormone abscisic acid (ABA) plays an important role in the adaptive response of plants to abiotic stresses. ABA also regulates many important processes, including seed dormancy, germination, inhibition of cell division, and stomatal closure. OsABF2 (Oryza sativa ABRE binding factor2) is one of the bZIP type transcription factors, which are involved in abiotic stress response and ABA signaling in rice. Expression of OsABF2 is induced by ABA and various stress treatments. Findings show that survival rates of OsABF2 over-expressing Arabidopsis lines were increased under drought, salt, and heat stress conditions. The germination ratio of OsABF2 over-expressing Arabidopsis lines was decreased in the presence of ABA. Results indicate that OsABF2 over-expressing Arabidopsis lines have enhanced abiotic stress tolerance and have increased ABA sensitivity.
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