Journal
PLANT PHYSIOLOGY
Volume 164, Issue 4, Pages 1587-1592Publisher
AMER SOC PLANT BIOLOGISTS
DOI: 10.1104/pp.114.235556
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Funding
- Ministry of Education, Culture, Sports, Science, and Technology Japan [24570063]
- Programme for Promotion of Basic and Applied Researches for Innovations in Bio-oriented Industry
- Grants-in-Aid for Scientific Research [24570063] Funding Source: KAKEN
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Abscisic acid (ABA) is a phytohormone that responds to environmental stresses, such as water deficiency. Recent studies have shown that ABA biosynthetic enzymes are expressed in the vascular area under both nonstressed and water-stressed growth conditions. However, specific cells in the vasculature involved in ABA biosynthesis have not been identified. Here, we detected the expression of two genes encoding ABA biosynthetic enzymes, ABSCISIC ACID DEFICIENT2 and ABSCISIC ALDEHYDE OXIDASE3, in phloem companion cells in vascular tissues. Furthermore, we identified an ATP-binding cassette transporter, Arabidopsis thaliana ABCG25 (AtABCG25), expressed in the same cells. Additionally, AtABCG25-expressing Spodoptera frugiperda9 culture cells showed an ABA efflux function. Finally, we observed that enhancement of ABA biosynthesis in phloem companion cells induced guard cell responses, even under normal growth conditions. These results show that ABA is synthesized in specific cells and can be transported to target cells in different tissues.
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