Production and accumulation of UV-B absorbing compounds in UV-B irradiated leaves of rice, Oryza sativa L.: Effects of varying UV-B doses on leaf damage, phenolic content and HPLC peak I area

Issue Date

9-2005

Abstract

The effects of varying UV-B doses on leaf damage, phenolic content and HPLC peak I area were studied using 65-d-old plants of the UV-B tolerant rice cultivar, M202, and the UV-B susceptible rice cultivar, Dular. Results showed that the production and accumulation of UV-B-absorbing compounds in rice leaves were affected by leaf position and levels (dose) of UV-B and time or duration of UV-B irradiation or exposure. The youngest terminal leaves showed the least damage when exposed to medium and high UV-B doses. The production of these absorptive compounds as represented by relative phenolics and HPLC peak I were significantly higher in younger leaves and lower in older or senescing leaves. M202 showed significantly higher amounts of peak I area and relative phenolics compared to the UV-B susceptible rice cultivar, Dular. The results also confirmed the strong relationship of overall damage rating and area of HPLC peak I. The development of UV-B symptoms in the susceptible cultivar was hastened when a high UV-B treatment was applied. Peak I area did not accumulate in the UV-B susceptible Dular at any given UV-B dose.

Source or Periodical Title

Philippine Agricultural Scientist

ISSN

317454

Volume

88

Issue

3

Page

292-304

Document Type

Article

Language

English

Subject

Flavonoids, Oryza sativa, Phenolics, Susceptibility, Tolerance, Ultraviolet, UV-B, UV-B absorbing compounds

Digital Copy

none

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