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Publication Type J
Authors Yamamoto, A., M. Hashiguchi, R. Akune, T. Masumoto, M. Muguerza, Y. Saeki and R. Akashi
Title The relationship between salt gland density and sodium accumulation/secretion in a wide selection from three Zoysia species
Source Australian Journal of Botany
Author Keywords leaf blade Na+ accumulation Na+ secretion salinity salt glands Zoysia spp. salinity tolerance mechanisms electron-microscopy halophytes stress plants evolution transport gene chloridoideae registration
Abstract Several zoysiagrasses (Zoysia spp.) have been reported to have leaf-epidermal salt glands, and it has been suggested that salt gland density, salt secretion and salt tolerance are positively correlated. The economically most important Zoysia species are Zoysia japonica Steud., Zoysia matrella Merr., and Zoysia pacifica (Goudswaard) M. Hotta&Kuroki, and among these, Z. matrella is considered to be the most salt-tolerant. In this study, we investigated the salt gland density, and characterised the secretion and accumulation of Na+ of 48 accessions of the three Zoysia species. We did not find any morphological differences in salt glands of Z. japonica and Z. pacifica, but large bicellular salt glands were found only on the adaxial side of Z. matrella. In addition, salt gland density differed significantly within and between the species. Under salt stress, all accessions accumulated and secreted Na+ at different rates. Z. japonica was a salt-accumulating type, whereas Z. matrella and Z. pacifica secreted most of the absorbed salt. However, the correlation between salt gland density and salt accumulation/secretion were not observed. Furthermore, Z. pacifica had the lowest gland density but showed the highest Na+ uptake and a secretion rate similar to most salt-tolerant Z. matrella. These results suggest that response to salt stress, namely, salt accumulation/secretion, is different between species, and that salt gland density and salt secretion are not always positively correlated.
Author Address [Yamamoto, Akihiro; Hashiguchi, Masatsugu; Akune, Ryo; Masumoto, Takahito; Muguerza, Melody; Saeki, Yuichi; Akashi, Ryo] Miyazaki Univ, Fac Agr, 1-1 Gakuen Kibanadai Nishi, Miyazaki, Miyazaki 8892192, Japan. Akashi, R (reprint author), Miyazaki Univ, Fac Agr, 1-1 Gakuen Kibanadai Nishi, Miyazaki, Miyazaki 8892192, Japan. rakashi@cc.miyazaki-u.ac.jp
ISSN 0067-1924
ISBN 0067-1924
29-Character Source Abbreviation Aust. J. Bot.
Year Published 2016
Volume 64
Issue 4
Beginning Page 277-284
Digital Object Identifier (DOI) 10.1071/bt15261
Unique Article Identifier WOS:000379974100001
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