Journal
PROCEEDINGS OF THE JAPAN ACADEMY SERIES A-MATHEMATICAL SCIENCES
Volume 85, Issue 6, Pages 187-197Publisher
JAPAN ACAD
DOI: 10.2183/pjab.85.187
Keywords
ItNHX1; Ipomoea tricolor cv. Heavenly Blue; vacuolar pH increase; K+/H+ exchange; cell expansion growth; flower opening
Categories
Funding
- Ministry of Education, Culture, Sports, Science and Technology, Japan [16370021]
- Creative Scientific Research [16GS0206]
- Global COE in Chemistry
- Nagoya University and Research oil Priority Area [18032037, 19039012]
- NIBB Cooperative Research Program
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Petal color change in morning glory Ipomoea tricolor cv. Heavenly Blue, from red to blue, during the flower-opening period is due to an unusual increase in vacuolar pH (pHv) from 6.6 to 7.7 in colored epidermal cells. We clarified that this pHv increase is involved in tonoplast-localized Na+/H+ exchanger (NHX). However, the mechanism of pHv increase and the physiological role of NHX1 in petal cells have remained obscure. In this study, synchrony of petal-color change from red to blue, pHv increase, K+ accumulation, and cell expansion growth during flower-opening period were examined with special reference to ItNHX1. We concluded that ItNHX1 exchanges K+, but not Na+, with H+ to accumulate an ionic osmoticum in the vacuole, which is then followed by cell expansion growth. This function may lead to full opening of petals with a characteristic blue color.
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