ISHS Acta Horticulturae 755: International Conference on Quality Management in Supply Chains of Ornamentals
ANALYSIS OF THE CELL WALL LOOSENING PROTEINS DURING ROSE FLOWER OPENING |
| Authors: | R. Takahashi, C. Fujitani, S. Yamaki, K. Yamada |
| Keywords: | expansin, cut flower quality, petal growth, Rosa hybrida, xyloglucan endotransglycosylase/hydrolase |
| DOI: | 10.17660/ActaHortic.2007.755.66 |
| Abstract:
Rose is a popular cut flower all over the world. However, it is known that cut rose doesn’t have a long vase life. If we can prolong its vase life, higher quality would be expected. Especially in roses, we enjoy flower opening, which is the petal growth from bud to full bloom. If we can control the speed of petal growth, we can enjoy cut rose longer. Flower opening is generally caused by expansion growth of petal cells. It has been suggested water influx into petal cells is a key mechanism for cell enlargement and flower opening. However, it has been proposed that when the cell wall of the petal remains rigid, water influx and cell expansion do not occur. Therefore, we believe cell wall loosing is one of the important factors for flower opening. Xyloglucan endotransglycosylase/hydrolase (XTH) and expansin are known as representative proteins that loosen plant cell walls. In our study, we are trying to clarify how these proteins are involved in flower opening of rose and contribute to improvement of rose vase life. We have isolated four XTH cDNAs and three expansin cDNAs from rose petal and analyzed their mRNA expression independently during petal development. The mRNA transcript level of some clones was exclusively correlated to rose flower opening. | |
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