HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) An erratum has been published Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Dai, Q. Articles by Quintos, A. T. Search for Related Content PubMed Articles by Dai, Q. Articles by Quintos, A. T. Agricola Articles by Dai, Q. Articles by Quintos, A. T.

Ultraviolet-B Radiation Effects on Growth and Physiology of Four Rice Cultivars

Jiangsu Academy of Agric. Sci., China
Agronomy, Plant Physiology, and Agroecology Division, IRRI, P.O. Box 933, 1099 Manila, Philippines
ManTech Environmental Technology, USEPA Environmental Res. Lab., 200 SW 35th St., Corvallis, OR, 97333, USA

^* Corresponding author.

Enhanced ultraviolet-B (UV-B, 280320 nm) radiation, such as could be caused by stratospheric O, depletion, has been demonstrated to profoundly affect plants. This study was conducted to determine the effects of UV-B on four high-yielding, lowland rice (Oryza sativa L.) cultivars (IR30, IR45, IR64, and IR74), and to evaluate morphological and physiological parameters for identifying sensitive and less-sensitive genotypes in future screenings. Ultraviolet-B radiation was supplied by UV-B-emitting fluorescent lamps in the phytotron. Plant height, leaf area, dry weight, net assimilation rate (NAR), and relative growth rate (RGR) were significantly influenced by 4-wk UV-B treatment in some cultivars. Based on the relative change in total biomass production between UV-B-irradiated and control plants, cultivar IR74 was the most sensitive and cultivar IR64 the least sensitive. Biomass production, however, did not proportionally decrease with plant height under UV-B treatment. Changes in plant height and leaf area induced by UV-B can alter the rice plant canopy structure. Differential varietal response was found in shoot dry weight, leaf area, specific leaf weight (SLW), NAR, and RGR. These parameters can be used as selection criteria for rice cultivars less sensitive to UV-B. Most physiological and biochemical parameters evaluated, including root-oxidizing activity, soluble protein, nucleic acid, ion leakage, stomatal aperture, and flavonoid and chlorophyll contents, were affected by 2 wk of UV-B treatment and gave differential cultivar responses. The distinct responses and relative ease in measurement of stomatal opening and ion leakage make these parameters suitable indices in selecting rice cultivars less sensitive to UV-B after 2 wk of UV-B treatment.

Received for publication April 29, 1991.

This article has been cited by other articles:

				M. Teranishi, K. Nakamura, H. Morioka, K. Yamamoto, and J. Hidema The Native Cyclobutane Pyrimidine Dimer Photolyase of Rice Is Phosphorylated Plant Physiology, April 1, 2008; 146(4): 1941 - 1951. [Abstract] [Full Text] [PDF]

				J. HIDEMA and T. KUMAGAI Sensitivity of Rice to Ultraviolet-B Radiation Ann. Bot., June 1, 2006; 97(6): 933 - 942. [Abstract] [Full Text] [PDF]

				M. Teranishi, Y. Iwamatsu, J. Hidema, and T. Kumagai Ultraviolet-B Sensitivities in Japanese Lowland Rice Cultivars: Cyclobutane Pyrimidine Dimer Photolyase Activity and Gene Mutation Plant Cell Physiol., December 15, 2004; 45(12): 1848 - 1856. [Abstract] [Full Text] [PDF]