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Enhanced UV‐B radiation has little effect on growth, δ 13 C values and pigments of pot‐grown rice ( Oryza sativa ) in the field
Author(s) -
Kim Hak Yoon,
Kobayashi Kazuhiko,
Nouchi Isamu,
Yoneyama Tadakatsu
Publication year - 1996
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1996.tb00175.x
Subject(s) - oryza sativa , panicle , cultivar , chlorophyll , chlorophyll a , ultraviolet b radiation , chemistry , horticulture , ozone depletion , paddy field , chlorophyll b , chlorophyll fluorescence , pigment , oryza , yield (engineering) , agronomy , botany , ozone , biology , ultraviolet radiation , materials science , radiochemistry , biochemistry , organic chemistry , gene , metallurgy
Predicted increase in ultraviolet‐B (UV‐B: 280–320 mn) radiation may have adverse impacts on growth and yield of rice ( Oryza sativa L.), as has been found in studies hitherto. However, most of the studies were conducted in growth chambers or greenhouses where the plants are generally more sensitive to UV‐B than in the field, presumably because of the distorted balance between UV‐B and ultraviolet‐A as well as PAR. This study was conducted to address the effects of enhanced UV‐B on growth and yield of rice under a realistic spectral balance in the field. Three cultivars, “Koshihikari”,‘IR 45’and‘IR 74’were pot‐grown and irradiated with enhanced UV‐B for most of the growing season in the field at Tsukuba, Japan (36°01′N, 140°07′E). The UV‐B enhancement simulated ca 38% depletion of stratospheric ozone at Tsukuba. The results showed no UV‐B effects on plant height, numbers of tillers and panicles, dry weight of the plant parts or the grain yield for any of the 3 cultivars. Natural abundance of 13 C in the flag leaves was not altered by the UV‐B enhancement either. While UV‐absorbing compounds showed no response to the UV‐B enhancement, chlorophyll contents decreased with enhanced UV‐B. However, the decrease of chlorophyll was limited to an early growth stage with no effect later. We thus found no extraordinary impact of the nearly doubled UV‐B radiation on rice in the field, and it would appear that a reliable prediction of the effects of UV‐B will require experiments carried out over a number of years under various climatic and solar UV‐B regimes.