RESEARCHES REGARDING THE HISTO-ANATOMY AND FLORAL MORPHOGENESIS IN SOME OROBANCHE L. SPECIES
Journal Title: Analele Stiintifice ale Universitatii Alexandru Ioan Cuza din Iasi, Serie noua, Sectiunea II a. Biologie vegetala - Year 2007, Vol 53, Issue 0
Abstract
The present paper shows the results of histo-anatomical research studies made on five species of parasitic plants in Romania, species within the Orobanche genus: Orobanche arenaria Borkh., O. cernua Loefl., O. major Boissen., O minor Sutton and O. purpurea Jacq. The authors investigate the structure of vegetative and reproductive organs (haustoria, stem, leaf, flower) of five species, presenting thus a series of common or different traits of the five holoparasitic species. The analysis of the haustorium in holoparasitic plants has allowed the identification of the presence, within the haustorium parenchyma, of woody tissue; there can be observed direct contact between the woody vessels of the haustorium and the ones of the host plant on the sections. These aspects prove the fact that holoparasites extract a large part of the water with mineral nutrients of the host plant, this observation completing the literature data, that states the idea that holoparasites use only the organic solutions from the host plant. The distribution pattern of the vascular tissues, as well as the formation manner of the haustoria and their exogenous origin, prove once more that the haustoria does not represent a root or a metamorphosed stalk, but a specialized organ, perfectly adapted to its absorption function. The Orobanche leaves, reduced to scales, have an extremely simple structure; their mesophyll is reduced, and that is strongly correlated with the loss of their photosynthetic capacity. The mechanical tissue is well developed in the Orobanche species we have investigated.
Authors and Affiliations
C. TOMA, ASPAZIA ANDRONACHE, IRINA GOSTIN
Keywords
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