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Responses of tradescantia stamen hairs and pollen to uv b irradiation



Responses of tradescantia stamen hairs and pollen to uv b irradiation



Environmental and Experimental Botany 16(2-3): 195-199



Clones 02 and 4430 of Tradescantia were tested in field, greenhouse and controlled-environment chambers as monitors for the potentially hazardous UV-B irradiation increase that could result from stratospheric ozone decrease. In addition to about 16 h of solar emissions at about 2100 micro-einsteins.cntdot.m-2.cntdot.s-1 (400-700 nm) and 15 h at about 1800 micro-einsteins.cntdot.m-2.cntdot.s-1 in the field and greenhouse, respectively, plants were given 7 h of supplemental UV-B irradiation/day for 27 days. After the first 7 days of UV-B irradiation exposure, cumulative data were recorded for 20 days. Cuttings of Tradescantia plants in controlled-environment, exposed to 16 h of simulated solar emission of about 800 micro-einsteins.cntdot.m-2.cntdot.s-1 (400-700 nm), were also exposed to 10 h of supplemental UV-B irradiation/day for 1 or 2 days. All plants were checked for somatic aberrations (color changes in the flower petals and stamen hairs), number of hairs per stamen and cells per hair. Pollen germination and pollen tube growth were noted after a 90 min UV-B irradiation period. Somatic aberrations occurred infrequently in the petals and were judged unreliable criteria for use in monitoring enhanced UV-B irradiation environments. The number of aberrant events within stamen hairs was significantly increased by the UV-B irradiation treatments, while pollen germination and pollen tube growth were significantly reduced. Color changes in stamen hairs and pollen viability and useful criteria for monitoring UV-B irradiation changes.

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