Aerenchyma formulation in roots of maize during sulphate starvation

A - Papers appearing in refereed journals

Bouranis, D. L., Chorianopoulou, S. N., Siyannis, V. F., Protonotarios, V. E. and Hawkesford, M. J. 2003. Aerenchyma formulation in roots of maize during sulphate starvation. Planta. 217 (3), pp. 382-391. https://doi.org/10.1007/s00425-003-1007-6

AuthorsBouranis, D. L., Chorianopoulou, S. N., Siyannis, V. F., Protonotarios, V. E. and Hawkesford, M. J.
Abstract

Young maize (Zea mays L., Poaceae) plants were grown in a complete, well-oxygenated nutrient solution and then deprived of their external source of sulphate. This treatment induced the formation of aerenchyma in roots. In addition to the effect of sulphate starvation on root anatomy, the presence and location of superoxide anions and hydrogen peroxide, and changes in calcium and pH were examined. By day 6 of sulphate deprivation, aerenchyma started to form in the roots of plants and the first aerenchymatous spaces were apparent in the middle of the cortex. S-starvation also induced thickening of the cell walls of the endodermis. Active oxygen species appeared in groups of intact mid-cortex cells. Formation of superoxide anion and hydrogen peroxide was found in degenerating cells of the mid-cortex. Very few nuclei in the cortex of S-starved roots fluoresced, being shrunken and near to the cell wall. By day 12 of S-deprivation, a fully developed aerenchyma was apparent and there were only a few 'chains' of cells bridging hypodermis to endodermis and stele of roots. Cell walls of endodermis of S-starved roots increased 68% in thickness. Intensive fluorescence in the cell walls of the endodermal, hypodermal and to a lesser extent of epidermal cells was observed due to the formation of active oxygen species, while there was no fluorescence in the cortical cells. There was a higher Ca concentration in the cells walls of the endodermis and epidermis, compared to the rest of the S-starved root tissues. A higher pH was observed, mainly in the cell walls of the hypodermis and to a lesser extent in the cell walls of the endodermis. Superoxide anion and hydrogen peroxide was found in degenerating cells of the root cortex. There was no fluorescence of nuclei in the cortex of S-starved roots. 

Year of Publication2003
JournalPlanta
Journal citation217 (3), pp. 382-391
Digital Object Identifier (DOI)https://doi.org/10.1007/s00425-003-1007-6
Open accessPublished as non-open access
Funder project or code442
522
Regulation of sulphate transporter gene expression and sulphur metabolism in cereals, source-sink interactions and sulphur supply to grain tissues
Project: 4392
PublisherSpringer Nature

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