Abstract
The impact of climatic change on crop production is a major concern currently. One of the climatic factors, ultraviolet-B (UV-B; 280–320nm) radiation, is increasing as a result of the depletion of the global stratospheric ozone layer, which alters crop productivity. Elevated UV-B radiation shows negative relationships with rice (Oryza sativa L.) physiology, grain yield, and biomass production. Several studies have reported that tolerance to elevated UV-B exists among diverse rice varieties. A crop management approach includes the use of specific plant growth regulators (PGRs) for the prevention and/or amelioration of various environmental stresses, including UV-B stress. This chapter focuses on the effects of elevated UV-B radiation on rice production and the beneficial effects of PGR (glycine betaine and salicylic acid) application against elevated UV-B on rice (O. sativa L.) production. In addition, it also provides information about UV-B tolerance among the southern US rice cultivars.
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