Showing papers by "Agnieszka Bagniewska-Zadworna published in 2011"
TL;DR: The carinal canals in E. ramosissimum have a distinctive lining containing pectic homogalacturonan, cellulose, xyloglucan and extensin, which might function as water-conducting channels which would be especially important during the elongation of the internodes when protoxylem is disrupted and the metaxylesm is not yet differentiated.
29 citations
TL;DR: This is the first report of non-lignified pectin-rich secondary cell walls in ferns and the hypothesis of parallel evolution of helical cell wall thickenings in Aspleniaceae is rejected.
25 citations
TL;DR: Ulastructural study showed that infecting fungi grow intramurally and that they are immobilized by CWAs when attempting to penetrate intracellularly, concluding that these appositions are defense-related structures made of a non-lignified polysaccharide matrix on which phenolic compounds are deposited in order to create a barrier protecting the root against infections.
24 citations
TL;DR: This study showed the feasibility of overcoming pre- and post-fertilisation barriers to achieve intergeneric hybrids between species from two genera of Salicaceae, which could be of great importance for increasing biomass production.
Abstract: Embryos and plants from the crosses Salix viminalis L. as the female parent and Populus alba L., P. violascens Dode or P. tremula L. as the male parent were obtained by in vitro embryo rescue technique. F1 intergeneric progeny were obtained by overcoming post-zygotic barriers caused by the deficiency of endosperm as nutritive tissue during the first stage of embryo development. Ovules containing immature heart-stage embryos as well as early cotyledonary embryos were isolated and rescued in modified 1/2 MS medium supplemented with 3% sucrose to ensure maturity. Seedlings were cultured under in vitro conditions in 1/2 MS medium that contained 0.2 mg l–1 naphtaleneacetic acid and plantlets after rooting were transferred first into pots and subsequently to the experimental field in the Botanical Garden in Poznan, Poland. After 2 years, the putative hybrid nature of the plants was checked by analysing morphological characters and molecular markers. Scanning electron microscopy, flow cytometry and random amplification of polymorphic DNA screening of individuals confirmed the hybrid nature of the S. viminalis × P. alba and S. viminalis × P. violascens progeny and of 25% of the analysed plants from the cross S. viminalis × P. tremula. This study showed the feasibility of overcoming pre- and post-fertilisation barriers to achieve intergeneric hybrids between species from two genera of Salicaceae. The in vitro system to produce hybrids with characters of both parents could be of great importance for increasing biomass production. This study also opens new opportunities to improve other traits in trees, such as resistance to pathogens inherited from one parent.
13 citations