Effects of UV-B radiation on germlings of the red macroalga Nemalion helminthoides (Rhodophyta)

Journal of Microscopy and Ultrastructure
Eliana M de OliveiraLuciane Cristina Ouriques

Abstract

Studies have clearly demonstrated the damaging effects of UV-B exposure on macroalgae, but few have reported the impact of UV-B on spore germination and development at juvenile stages. Therefore, this work aimed to analyze the effects of UV-B radiation on germlings of Nemalion helminthoides at the tetrasporophytic phase. To accomplish this, germlings of N. helminthoides were cultivated in the laboratory and separated into two groups. The control group was exposed onlyto photosynthetic radiation, while the treatment group was exposed to photosynthetic radiation + UV-B for 2 hours during a period of 12 days. Control germlings showed increasing cellular proliferation and accumulation of reserve substances, as well as intense ramification in the last observed stages between 9 days and 12 days of development. Moreover, the chloroplasts presented a typical globular pyrenoid, profusely traversed by thylakoid membranes. Treated germlings, by contrast, showed intracellular damage, such as cell wall thickness, loss of chloroplast organization, changes in mitochondrial cristae, and increasing atrophy of the Golgi bodies. Additionally, changes in developmental patterns were observed, including loss of polarity in the first divisions of car...Continue Reading

References

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Aug 8, 2009·Micron : the International Research and Review Journal for Microscopy·Andreas HolzingerCornelius Lütz
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Methods Mentioned

BETA
transmission electron microscopy
confocal microscopy

Software Mentioned

Leica
AF Lite
Statistica
LAS

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