Synchrony between flower opening and petal-color change from red to blue in morning glory, Ipomoea tricolor cv. Heavenly Blue.
Synchrony between flower opening and petal-color change from red to blue in morning glory, Ipomoea tricolor cv. Heavenly Blue.
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DOI：
10.2183/pjab.85.187
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
Kondo T
中科院分区：
文献类型：
--
作者：
Yoshida K;Miki N;Momonoi K;Kawachi M;Katou K;Okazaki Y;Uozumi N;Maeshima M;Kondo T
三色牵牛花瓣颜色的变化。在开花期间，从红色到蓝色的天蓝色是由于有色表皮细胞中液泡pH值（pHv）从6.6到7.7的不寻常增加。我们澄清，这种pH值的增加涉及液泡膜定位的Na+/H+交换器（NHX）。然而，pH值增加的机制和NHX 1在花瓣细胞中的生理作用仍然不清楚。在这项研究中，同步花瓣颜色从红色到蓝色的变化，pH值的增加，K+积累，和细胞扩展生长在开花期间进行了检查，特别是参考ItNHX 1。我们的结论是，ItNHX 1交换K+，而不是Na+，与H+积累的离子在液泡中，这是随后的细胞扩张生长。这种功能可能会导致花瓣完全开放，并呈现出特有的蓝色。
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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