TY - JOUR
T1 - Effects of supplemental UV-B radiation on the growth and yield of two cultivars of Japanese lowland rice (Oryza sativa L.) under the field in a cool rice-growing region of Japan
AU - Kumagai, Tadashi
AU - Hidema, Jun
AU - Kang, Hye Sook
AU - Sato, Tadashi
N1 - Funding Information:
The authors thank Mr. Shouichi Musashi and Mr. Gichi Kumagai for maintenance of the UV-B radiation system and Mr. Kunio Ichijyo for assisting in this research. The suggestions for improving the paper, provided by the anonymous reviewers, were much appreciated. This work was supported by Grants-in-Aid (nos. 10044195, 1076183 and 09NP0901) for Scientific Research from the Ministry of Education, Science and Culture, Japan, and the Second Toyota High-Tech Research Grant Program.
PY - 2001
Y1 - 2001
N2 - An investigation was made of the variations in growth and grain yield in response to increased exposure to UV-B radiation of Japanese lowland rice (Oryza sativa L.) in a cool rice-growing region. Two cultivars, UV-resistant cv. 'Sasanishiki' and UV-sensitive cv. 'Norin 1', were examined in a lowland field at Kashimadai (37° 28′E, 141°06′E) in Miyagi Prefecture, Japan, for four cropping seasons from 1994 to 1997. The two cultivars were grown in a lowland field with or without supplemental UV-B radiation, which was provided by UV-B-emitting fluorescent lamps, with a 0.1-mm-thick cellulose diacetate film as a filter. In both cultivars, significant decreases in tiller number as the result of supplemental UV-B radiation were observed during the tillering stage in 1994, 1995 and 1997. Furthermore, decreases in grain size from supplemental UV-B radiation were recorded in all seasons. The trend towards small grain size was pronounced in 1996. In that year, the mean daily middle temperatures were lower throughout most of the cropping season and the mean daily hours of sunshine during the tillering stage and between the end of the panicle differentiation stage and the beginning of the ripening stage were shorter. In 1993 when the temperature and the amount of sunshine were both lower, the tiller number, the dry mass of aboveground parts and the panicle number were significantly reduced by supplemental unfiltered UV-B radiation. There was a cultivar difference in the inhibitory effects of supplemental UV-B radiation on growth between the sensitive cultivar Norin 1 and the resistant cultivar Sasanishiki. These results indicate that supplemental UV-B radiation has a positive effect on the growth and grain development of rice, which may be enhanced by unusual climatic conditions such as lower temperature and less sunshine, in cool rice-growing regions.
AB - An investigation was made of the variations in growth and grain yield in response to increased exposure to UV-B radiation of Japanese lowland rice (Oryza sativa L.) in a cool rice-growing region. Two cultivars, UV-resistant cv. 'Sasanishiki' and UV-sensitive cv. 'Norin 1', were examined in a lowland field at Kashimadai (37° 28′E, 141°06′E) in Miyagi Prefecture, Japan, for four cropping seasons from 1994 to 1997. The two cultivars were grown in a lowland field with or without supplemental UV-B radiation, which was provided by UV-B-emitting fluorescent lamps, with a 0.1-mm-thick cellulose diacetate film as a filter. In both cultivars, significant decreases in tiller number as the result of supplemental UV-B radiation were observed during the tillering stage in 1994, 1995 and 1997. Furthermore, decreases in grain size from supplemental UV-B radiation were recorded in all seasons. The trend towards small grain size was pronounced in 1996. In that year, the mean daily middle temperatures were lower throughout most of the cropping season and the mean daily hours of sunshine during the tillering stage and between the end of the panicle differentiation stage and the beginning of the ripening stage were shorter. In 1993 when the temperature and the amount of sunshine were both lower, the tiller number, the dry mass of aboveground parts and the panicle number were significantly reduced by supplemental unfiltered UV-B radiation. There was a cultivar difference in the inhibitory effects of supplemental UV-B radiation on growth between the sensitive cultivar Norin 1 and the resistant cultivar Sasanishiki. These results indicate that supplemental UV-B radiation has a positive effect on the growth and grain development of rice, which may be enhanced by unusual climatic conditions such as lower temperature and less sunshine, in cool rice-growing regions.
KW - Cool rice-growing region
KW - Field work
KW - Grain size
KW - Growth and yield
KW - Japan
KW - Rice
KW - Supplemental UV-B radiation
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U2 - 10.1016/S0167-8809(00)00180-8
DO - 10.1016/S0167-8809(00)00180-8
M3 - Article
AN - SCOPUS:0035133512
VL - 83
SP - 201
EP - 208
JO - Agro-Ecosystems
JF - Agro-Ecosystems
SN - 0167-8809
IS - 1-2
ER -