Aspecte morfometrice ale meiocitelor şi grăuncioarelor de polen la plantele de floarea–soarelui cu androsterilitate indusă Morphometric aspects of meyocites and pollen grain in sunflower with induced androsterility

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Victoria NECHIFOR

Abstract

Morphometric characterization is an important element in the study of dynamic cellular behavior in
plant responses to biotic and abiotic stimuli. The aim of study was to determine the morphometric parameters of meiocytes and pollen grains in different phases of microsporogenesis in fertile and induced androsterility sunflower plants. Thus, the comparative morphometric analysis revealed the gametocidal effect of gibberellin that is manifested as abnormal changes in shape and volume of cells. These modifications lead to deficiencies in the integrity/rigidity and, respectively, in the functionality of the cell wall, as well as in the physical properties of the protoplasm. The low values of morphometric parameters were also correlated with the degree of sterility of pollen grains.
Key words: Helianthus annuus; Cell morphology; Pollen fertility; Induced androsterility.
Rezumat. Caracterizarea morfometrică este un element important în studiul proceselor celulare dinamice ca răspuns la stimulii biotici şi abiotici. Scopul studiului constă în determinarea parametrilor morfometrici ai meiocitelor şi grăuncioarelor de polen în diferite faze ale microsporogenezei la plantele de floarea-soarelui fertile şi cu androsterilitate indusă. Astfel, analiza morfometrică comparativă a relevat efectul gametocid al giberelinei exprimat prin schimbările anormale ale formei şi volumului celulelor. Aceste modificări induc deficienţe atât în integritatea/rigiditatea şi, respectiv, în funcţionalitatea peretelui celular, cât şi în proprietăţile fizice ale protoplasmei. De asemenea, valorile scăzute ale parametrilor morfometrici au fost corelate cu gradul de sterilitate al grăuncioarelor de polen.
Cuvinte-cheie: Helianthus annuus; Morfologie celulară; Fertilitatea polenului; Androsterilitate indusă.

Article Details

How to Cite
NECHIFOR, Victoria. Aspecte morfometrice ale meiocitelor şi grăuncioarelor de polen la plantele de floarea–soarelui cu androsterilitate indusă. Stiinta agricola, [S.l.], n. 2, p. 11-15, jan. 2018. ISSN 2587-3202. Available at: <http://sa.uasm.md/index.php/sa/article/view/558>. Date accessed: 22 feb. 2018.
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