Synchrony between flower opening and petal-color change from red to blue in morning glory, Ipomoea tricolor cv. Heavenly Blue

Kumi Yoshida, Naoko Miki, Kazumi Momonoi, Miki Kawachi, Kiyoshi Katou, Yoshiji Okazaki, Nobuyuki Uozumi, Masayoshi Maeshima, Tadao Kondo

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

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 flow-eropening 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.

Original languageEnglish
Pages (from-to)187-197
Number of pages11
JournalProceedings of the Japan Academy Series B: Physical and Biological Sciences
Volume85
Issue number6
DOIs
Publication statusPublished - 2009 Sep 3

Keywords

  • Cell expansion growth
  • Flower opening
  • Heavenly blue
  • Ipomoea tricolor cv
  • ItNHX1
  • K/H exchange
  • vacuolar pH increase

ASJC Scopus subject areas

  • Agricultural and Biological Sciences(all)
  • Physics and Astronomy(all)

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