Alleviation of Al-toxicity in wheat by boron 1. Anatomical and ultrastructure effects of aluminium on root of aluminium-tolerant cultivar of Triticum aestivum

A. Tammam; S. Khallil; A. Elnagar

doi:10.1556/abot.54.2012.1-2.17

Acta Botanica Hungarica

Volume/Issue:: Volume 54: Issue 1-2

Alleviation of Al-toxicity in wheat by boron 1. Anatomical and ultrastructure effects of aluminium on root of aluminium-tolerant cultivar of Triticum aestivum

Authors:

A. Tammam

A. Tammam Alexandria University Department of Botany and Microbiology, Faculty of Science 21511 Alexandria Egypt

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S. Khallil

S. Khallil Alexandria University Department of Botany and Microbiology, Faculty of Science 21511 Alexandria Egypt

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A. Elnagar

A. Elnagar Alexandria University Department of Botany and Microbiology, Faculty of Science 21511 Alexandria Egypt

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Pages:: 189–210

Online Publication Date:: 24 Mar 2012

Publication Date:: 01 Mar 2012

Article Category:: Journal Article

DOI:: https://doi.org/10.1556/abot.54.2012.1-2.17

Keywords:: aluminium; boron; ultrastructure alterations; wheat

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The effect of aluminium was investigated on the seedlings pre-treated by two concentrations of boron 4 μM or 32 μM grown in water culture using a concentration of 500 μM Al for 3 days. Semithin and ultrathin sections of the apical region of the roots and transmission electron microscopy micrographs were analysed of fourteen-day-old Al-tolerant (‘Sakha 93’) cultivar of Triticum aestivum. Results showed that the amelioration effect of boron treatment was pronounced at 32 μM B level. Rigidity of cell wall and plasma membrane in the wheat root apex cells (Zone of root hairs) could result from the formation of bonds of ions of the toxicant with components within their structures and appears as dark precipitants in cross sections. Cross sections of the apical region of the control plant roots showed well-developed normal anatomical structure and cell ultrastructure typical for those of root regions. Slight alterations under the influence of aluminium or boron alone or both of them and the role exhibited by boron in ameliorating of aluminium toxicity were observed. In spite of these alterations, the seedlings keep grown in face of Al-stress. The obtained results proved the high resistance of the studied ‘Sakha 93’ cultivar to aluminium stress. Aluminium detoxification coincides with increased Ca²⁺ content in the root apex to cope with alleviation of Al-stress; boron may have a role in this concern. Possible Al-toxicity and -tolerance, as well as boron alleviation of toxicant stress in this tolerant cultivar was briefly discussed.

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Acta Botanica Hungarica

Print ISSN:: 0236-6495

Online ISSN:: 1588-2578

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László PEREGOVITS

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Botta-Dukát, Zoltán
E-mail: botta-dukat.zoltan@okologia.mta.hu

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Lőkös, László
E-mail: acta@bot.nhmus.hu
Institute: Botanical Department, Hungarian Natural History Museum
Address: Könyves K. krt. 40. H-1097 Budapest, Hungary

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