Common reed produces starch granules at the shoot base in response to salt stress
Article first published online: 2 AUG 2007
Volume 176, Issue 3, pages 572–580, November 2007
How to Cite
Kanai, M., Higuchi, K., Hagihara, T., Konishi, T., Ishii, T., Fujita, N., Nakamura, Y., Maeda, Y., Yoshiba, M. and Tadano, T. (2007), Common reed produces starch granules at the shoot base in response to salt stress. New Phytologist, 176: 572–580. doi: 10.1111/j.1469-8137.2007.02188.x
- Issue published online: 23 AUG 2007
- Article first published online: 2 AUG 2007
- Received: 29 April 2007; Accepted: 14 June 2007
- common reed (Phragmites australis);
- CoroNa Green AM;
- salt stress;
- shoot base;
- starch granules.
- • Common reed (Phragmites australis) is a well known salt-tolerant plant and it is suggested that reeds recover Na+ in the xylem sap of the shoot base (basal part of the shoot), store it temporarily in the shoot base, release it into the phloem sap, and then retranslocate it to the roots.
- • To investigate whether Na+ is retained in the shoot base of reeds, confocal laser scanning microscope (CLSM) observations were conducted using an intracellular Na+-specific fluorescent probe. The CLSM observations revealed that reeds produced a large number of the starch granules at the shoot base when salt-stressed, and that the fluorescence indicating the location of intracellular free Na+ was observed in the same position as the starch granules.
- • The Na content of starch granules was considerably greater than that of the shoot base, whereas the potassium (K) contents of the granules was only slightly greater than that of the shoot base.
- • Reeds produced Na+-binding starch granules in the parenchyma cells of the shoot base when salt-stressed; these starch granules may decrease intracellular free Na+. It is proposed that the site-specific production of Na+-binding starch granules constitutes a novel salt tolerance mechanism.