Abstract
In vitro regenerated rice (Oryza sativa cv. ADT 43) plantlets under ultraviolet-B selection showed altered growth and yield responses. Of the two sets of calli treated with low (10 min d-1) as well as high (30 min d-1) dose of ultraviolet-B (313 nm), shoots regenerated from low dose ultraviolet-B treatment evinced increased growth and yield. Panicle length and the number of grains were highest in ultraviolet-B (10 min) selected plantlets as compared to the control. Re-irradiation of treated plantlets showed increase in panicle length and grain numbers. Weight of the grains was also high in ultraviolet-B adapted plants. Key words: Calli, irradiation, grains, panicle, re-irradiation.
Highlights
Plants are constantly exposed to sun light and receive beneficial photosynthetically active radiation as well as harmful ultraviolet-B (UV-B) rays as a consequence of ozone depletion
Slight reduction in height was observed in the control after REIR (Figure 1D); whereas in 10 min UV-B selected plants, the growth was promoted by REIR treatment (Figure 1E)
The increment in growth was due to some UV adaptive mechanism induced in the UV-selection pressure given calli as reported earlier by Frohnmeyer et al (1999) and possibly by the biosynthesis of flavonoids (Frohnmeyer and Staiger 2003) which was shown to increase in UV-B adapted O. sativa cv
Summary
Plants are constantly exposed to sun light and receive beneficial photosynthetically active radiation as well as harmful ultraviolet-B (UV-B) rays as a consequence of ozone depletion. Panicle length and the number of grains were highest in ultraviolet-B (10 min) selected plantlets as compared to the control. Re-irradiation of treated plantlets showed increase in panicle length and grain numbers.
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