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JXB Advance Access published online on March 10, 2006
Journal of Experimental Botany, doi:10.1093/jxb/erj106
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© The Author [2006]. Published by Oxford University Press [on behalf of the Society for Experimental Biology]. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org
Received May 31, 2005
Accepted December 22, 2005

RESEARCH PAPER

Developmental regulation of K accumulation in pollen, anthers, and papillae: are anther dehiscence, papillae hydration, and pollen swelling leading to pollination and fertilization in barley (Hordeum vulgare L.) regulated by changes in K concentration?

S. Rehman 1 and S. J. Yun 1 *

1 Division of Biological Resources Science, College of Agriculture and Life Science, Chonbuk National University, Jeonju 561-756, Republic of Korea

* To whom correspondence should be addressed.
S. J. Yun, E-mail: sjyun{at}chonbuk.ac.kr


  Abstract

The presence of potassium (K) in pollen, anthers and papillae from barley (Hordeum vulgare L.) flowers with different levels of developmental stages starting from boot stage to fully mature flower, was studied by using the K-sensitive fluorescent dye PBFI (potassium-binding benzofuran isophthalate) and confocal laser scanning microscopy. The presence of heavy K fluorescence was detected only at the aperture area of the mature pollen. Similarly, the presence of K increased with the progression from immature to mature anther and papillae. In addition, a higher concentration of K was observed only at the stomium area (the place of anther dehiscence) of mature anthers. Keeping in view the role of K as an active osmoticum and the consistent and synchronized appearance of K in mature pollen, anthers, and papillae, it was concluded that K may regulate anther dehiscence, pollen imbibition, and papillae hydration leading to pollination and fertilization.

Keywords: Anther; confocal microscopy; papillae; PBFI; pollen; potassium.
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