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EFFECTS OF ULTRAVIOLET-B RADIATION ON GROWTH AND IAA LEVEL OF RICE (ORYZA SATIVA L.)(PDF)

Chinese Journal of Applied & Environmental Biology[ISSN:1006-687X/CN:51-1482/Q]

Issue:
1997 03
Page:
213-217
Research Field:
Publishing date:

Info

Title:
EFFECTS OF ULTRAVIOLET-B RADIATION ON GROWTH AND IAA LEVEL OF RICE (ORYZA SATIVA L.)
Author(s):
Huang Shaobai Dai Qiujie Liu Xiaozhong Peng Shaobing B. S. Vergara
1. Inst Agrobiol Genet Physiol, Jiangsu Acad Agricu Sci, Nanjing 210014;
2. Intern Rice Res Inst, P. O. Box 933, Manila 1099, Philippines
Keywords:
ultraviolet-Brice growthIAAIAA oxidase
CLC:
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PACS:
DOI:
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DocumentCode:

Abstract:
Two rice cultivars IR68 and Dular were grown under outdoor conditions and treated by 13.0 and 19.1kJ·m-2·d-1 (stimulating 20% and 40% ozone depletion) of biologically effective ultraviolet -B (UV-B) for two and four weeks to study the effect of supplemental UV-B radiation on the growth of rice. The results showed that plant height, leaf area, leaf dry weight except tiller number of both cultivars were reduced by enhanced UV-B radiation. IAA contents in the leaves of IR68 and Dular were decreased dramatically with the increase of UV-B treatment dose. After four weeks treatment, the reduction rate of IAA content in the leaves of IR68 and Dular subjected to 19.1kJ·m-2·d-1 UV-B radiation reached 48.7% and 46.2%,respectively. It was necessary to point out that IAA oxidase activities in both cultivars were promoted by UV-B treatment. It was discussed that the promotion of IAA oxidase activity in ice leaf induced by UV-B radiation resulted in the destroy of IAA and in turn to cause the inhibition the growth of rice.

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