HISTOCHEMICAL ASPECTS OF HELIANTHUS ANNUUS L. – OROBANCHE CUMANA WALLR. PATHOSYSTEM
Journal Title: Analele Stiintifice ale Universitatii Alexandru Ioan Cuza din Iasi, Serie noua, Sectiunea II a. Biologie vegetala - Year 2016, Vol 62, Issue 2
Abstract
Broomrape is a root holoparasitic angiosperm that causes severe losses in sunflower yield. During evolution, simultaneous with the emergence of new more virulent races of broomrape, Helianthus annuus has developed a broad spectrum of defensive mechanisms against the parasite. A general response to pathogen attack is represented by modifications of composition and properties of host's cell walls, especially accumulation of lignin and callose at the attachment zone, which prevent broomrape penetration and connection to the sunflower vascular system. Thus, the aim of the present work was to investigate the histological aspects of the resistance in host-parasite system Helianthus annuus L.- Orobanche cumana Wallr. An abundant accumulation of lignin and callose in the roots of resistant genotypes cultivated in soil infested with broomrape, compared to the control, has been established. These results indicated that the phenylpropanoid pathway was activated, synthesis of lignin was increases and cell wall was fortified.
Authors and Affiliations
Maria DUCA, Olesea TABARA
Keywords
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