Ultraviolet light-induced coiling and curvature of broom sorghum first internodes

Hashimoto, H and et al, . (1984) Ultraviolet light-induced coiling and curvature of broom sorghum first internodes. Physiologia Plantarum, 61 (1). pp. 1-7.

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Unilateral pulse ultraviolet irradiation caused positively phototropic coiling (> 180°) and curvature (≤ 180°) in the growth zone of dark-grown broom sorghum (Sorghum bicolor Moench, cv. Acme Broomcorn and Sekishokuzairai Fukuyama) first internodes. Coiling was induced by irradiation at 257 to 302 nm, and proceeded to develop almost linearly during 72 h or more involving new tissue produced after irradiation. Curvature, caused at 308 to 413 nm and by red light, developed rapidly during the first several hours then slowly to cease by about 24 h, and did not surpass 120° even at the optimum photon fluences. Action spectra were higher towards shorter wavelengths, having a shoulder at about 287 nm, and could not separate the two photoresponses. The curvature was partially but markedly suppressed by far-red following the ultraviolet irradiation, whereas the coiling was not affected. Possible involvement of a specific UV-B photoreceptor and phytochrome in curvature and of a UV-C photoreceptor in coiling is discussed.

Item Type: Article
Author Affiliation: Institute for Physical and Chemical Research, Wakoshi, Saitama, 351, Japan
Subjects: Agricultural Engineering > Mechanization
Crop Improvement
Divisions: Sorghum
Depositing User: Mr. SanatKumar Behera
Date Deposited: 01 Mar 2012 06:47
Last Modified: 01 Mar 2012 06:47
Official URL: http://dx.doi.org/Physiologia Plantarum
URI: http://eprints.icrisat.ac.in/id/eprint/3365

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