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Regulation of growth and development in phytochrome mutants of Arabidopsis thaliana by solar UV

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Abstract

Phytochrome mutants (phyA, phyB and phyAB) of Arabidopsis thaliana were grown under ambient and UV-excluded sunlight to understand their influence on growth and development by mutual exclusion. Phytochrome A and B played a complementary role in the regulation of germination. Suppression of hypocotyl length was predominantly under the control of phytochrome B; UV photoreceptors were active in suppression of hypocotyl growth only in phyB and phyAB mutants. Exclusion of UV promoted the number and the area of rosette leaves only in presence of phytochrome A and B. Phytochrome mutation reduced petiole length, whereas UV exclusion led to an increase. Requirement of long-day period for flowering was removed in the mutants. Under short-day conditions, flowering was predominantly under the control of phytochrome B, since phyB mutants flowered earlier than phyA mutants. Solar UV regulates the number of boltings and number of siliques per plant. Overall biomass of the plants is enhanced by the exclusion of UV only in the wild type. The interaction of phytochromes with UV photoreceptors is discussed in the paper.

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Abbreviations

UV:

Ultraviolet

Phy:

Phytochrome

DAE:

Days after emergence

SD:

Short day

LD:

Long day

W:

White

R:

Red

WT:

Wild type

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Acknowledgments

We thankfully acknowledge review of the data by Dr. Vitaly Sineshchekov and Dr. Larissa Koppel of Biophysics Department, Moscow, Russia.

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Authors and Affiliations

  1. School of Life Sciences, Devi Ahilya University, Khandwa Road, Indore, 452017, MP, India

    Priya Mani & Kadur Narayan Guruprasad

  2. Pulikkal House, Cherai P.O, Ernakulam, 683514, Kerala, India

    Priya Mani

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  1. Priya Mani
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  2. Kadur Narayan Guruprasad
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Correspondence to Priya Mani.

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Communicated by Z. Miszalski.

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Mani, P., Guruprasad, K.N. Regulation of growth and development in phytochrome mutants of Arabidopsis thaliana by solar UV. Acta Physiol Plant 37, 111 (2015). https://doi.org/10.1007/s11738-015-1849-0

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  • DOI: https://doi.org/10.1007/s11738-015-1849-0

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