TY - JOUR
T1 - UVB-induced cyclobutyl pyrimidine dimer and photorepair with progress of growth and leaf age in rice
AU - Hidema, Jun
AU - Kumagai, Tadashi
N1 - Funding Information:
We thank Drs Betsy M. Sutherlandand C. Sutherland for critical reading of the manuscript, Dr TadashiS ato for his kind advice and Mr Shouichi Musashi for maintenanceo f the growth cabinet. This work was supportedb y a Grant-in-Aid (Nos. 07558202, 1044195 and 10760183) for Scientific Researchf rom the Ministry of Education, Culture and Science, Japan, and the 2nd Toyota High-tech ResearchG rant Program.
PY - 1998/5/15
Y1 - 1998/5/15
N2 - We have examined the susceptibility to cyclobutyl pyrimidine dimer (CPD) induction by UVB radiation, the ability to photorepair cyclobutyl pyrimidine dimers (CPDs), and the levels of ultraviolet (UV)-absorbing compounds in various developing stages of leaves in UVB-resistant (Sasanishiki) and -sensitive (Norin 1) rices (Oryza sativa L.). UVB produces more CPDs in the second, third and fourth fully expanded leaves than in the fifth and sixth fully expanded leaves. In leaves in which the levels of UV-absorbing compounds are lower, more CPDs are produced. The ability to photorepair CPDs in fully expanded leaves of different stages of each cultivar remains approximately constant, although the photorepair capacity in the fourth leaf rapidly increases from leaf emergence until full expansion. The photorepair capacity is lower in Norin 1 than that in Sasanishiki in all the leaf stages or different aged leaves. These results therefore suggest that lice plants could be more susceptible to CPD induction at the stage when the second, third or fourth leaves are developing, and UVB sensitivity correlates with low CPD photorepair.
AB - We have examined the susceptibility to cyclobutyl pyrimidine dimer (CPD) induction by UVB radiation, the ability to photorepair cyclobutyl pyrimidine dimers (CPDs), and the levels of ultraviolet (UV)-absorbing compounds in various developing stages of leaves in UVB-resistant (Sasanishiki) and -sensitive (Norin 1) rices (Oryza sativa L.). UVB produces more CPDs in the second, third and fourth fully expanded leaves than in the fifth and sixth fully expanded leaves. In leaves in which the levels of UV-absorbing compounds are lower, more CPDs are produced. The ability to photorepair CPDs in fully expanded leaves of different stages of each cultivar remains approximately constant, although the photorepair capacity in the fourth leaf rapidly increases from leaf emergence until full expansion. The photorepair capacity is lower in Norin 1 than that in Sasanishiki in all the leaf stages or different aged leaves. These results therefore suggest that lice plants could be more susceptible to CPD induction at the stage when the second, third or fourth leaves are developing, and UVB sensitivity correlates with low CPD photorepair.
KW - Cyclobutyl pyrimidine dimer(s)
KW - Leaf stage and age
KW - Photorepair
KW - Rice
KW - UV-absorbing compounds
KW - UVB radiation
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U2 - 10.1016/S1011-1344(98)00094-3
DO - 10.1016/S1011-1344(98)00094-3
M3 - Article
AN - SCOPUS:0032524358
VL - 43
SP - 121
EP - 127
JO - Journal of Photochemistry and Photobiology B: Biology
JF - Journal of Photochemistry and Photobiology B: Biology
SN - 1011-1344
IS - 2
ER -