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

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cg.contributor.affiliationInternational Rice Research Instituteen_US
cg.contributor.affiliationJiangsu Academy of Agricultural Sciencesen_US
cg.contributor.affiliationUnited States Environmental Protection Agencyen_US
cg.identifier.doihttps://doi.org/10.2135/cropsci1992.0011183x003200050041xen_US
cg.issn0011-183Xen_US
cg.issue5en_US
cg.journalCrop Scienceen_US
cg.volume32en_US
dc.contributor.authorDai, Qiujieen_US
dc.contributor.authorCoronel, Victoria P.en_US
dc.contributor.authorVergara, Benito S.en_US
dc.contributor.authorBarnes, Paul W.en_US
dc.contributor.authorQuintos, Arlene T.en_US
dc.date.accessioned2024-12-19T12:57:27Zen_US
dc.date.available2024-12-19T12:57:27Zen_US
dc.identifier.urihttps://hdl.handle.net/10568/167496en_US
dc.titleUltraviolet-B Radiation Effects on Growth and Physiology of Four Rice Cultivarsen_US
dcterms.abstractEnhanced ultraviolet‐B (UV‐B, 280–320 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.en_US
dcterms.available1992-09en_US
dcterms.bibliographicCitationDai, Qiujie; Coronel, Victoria P.; Vergara, Benito S.; Barnes, Paul W. and Quintos, Arlene T. 1992. Ultraviolet-B Radiation Effects on Growth and Physiology of Four Rice Cultivars. Crop Science, Volume 32 no. 5 p. 1269-1274en_US
dcterms.extentpp. 1269-1274en_US
dcterms.issued1992-09en_US
dcterms.languageenen_US
dcterms.licenseCopyrighted; all rights reserveden_US
dcterms.publisherWileyen_US
dcterms.subjectultraviolet radiationen_US
dcterms.subjectgrowthen_US
dcterms.subjectphysiologyen_US
dcterms.subjectcultivarsen_US
dcterms.typeJournal Articleen_US

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