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Cytokinin overproducing ipt-161 Arabidopsis shows altered NO generation and insensitivity to selenite

100%

Kolbert Z., Lehotai N., Peto A., Feigl G., Tugyi N., Erdei L.

BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology

2013

tom 94

nr 2

Quantifiable differences between phytolith assemblages detected at species level: analysis of the leaves of nine Poa species (Poaceae)

100%

Lisztes-Szabo Z., Kovacs S., Balogh P., Daroczi L., Penksza K., Peto A.

Acta Societatis Botanicorum Poloniae

2015

tom 84

nr 3

The taxonomie value of phytolith assemblages and their degree of variability within different species of the same genus is still an undervalued issue in the botanical range of phytolith studies. However the understanding of grass phytolith variance and its implications to plant systematics is doubtless. In the present study phytoliths of the lateral shoots (leaves) of nine, globally distributed Poa species (Pooideae - Poaceae) are described. Phytoliths were recovered from Poa specimens by the dry ashing technique. Altogether 6223 disarticulated phytoliths were counted (approximately 500-700 phytoliths per species) in 54 plant samples, which cover six shoots of nine species. Not only the relative frequency of each morphotype was calculated, but measurements were conducted to determine the biogenic silica content of Poa lateral shoots. A phytolith reference collection for the nine selected species of a worldwide importance was also compiled. The description of the most significant phytolith morphotypes and their taxonomic relationships are given here. Results suggest that the biogenic silica content of the Poa lateral shoots was determined to be relatively high within all nine species. Phytolith assemblage data was subjected to multivariate statistical analyses (e.g., CA and PCA) in order to find differences and similarities among the nine Poa species. Results show that the two closely related Poa of the P. pratensis species group, namely the P. pratensis and P. angustifolia, only slightly differ from the other Poa species if we consider their rondel-trapeziform short cells (SC) phytolith frequencies.

In vivo and in situ visualization of early physiological events induced by heavy metals in pea root meristem

100%

Lehotai N., Peto A., Bajkan S., Erdei L., Tari I., Kolbert Z.

Acta Physiologiae Plantarum

2011

tom 33

nr 6

Heavy metals (HMs) are toxic pollutants, which can negatively affect the physiological processes of plants; moreover, HMs can be present in the food chain endangering people’s health. The aim of this study was to investigate the early physiological events during HM exposure in the root tips of the food plant Pisum sativum L. Ten-day-old pea plants were treated with 100 µM CdCl₂ or CuSO₄, in nutrient solution for 48 h. We studied the rapid formation of different reactive oxygen species (hydrogen peroxide H₂O₂ and superoxide radical O₂⁻) and reactive nitrogen species (nitric oxide NO and peroxynitrite ONOO⁻) together with membrane damage and cell death in the meristem cells of pea roots using in vivo and in situ microscopic methods. In our experimental system, copper and cadmium induced the formation of H₂O₂ and NO. Two hours of heavy metal treatments resulted in an increased O₂⁻ formation; however, later the level of this reactive molecule dramatically decreased. We found that high levels of NO were needed for ONOO⁻ production under HM exposure. A fast loss of membrane integrity and decreased cell viability were detected in root tips of copper-treated plants. The effects of cadmium seemed to be slower compared to copper, but this non-essential metal also caused cell death. We concluded that viability decreased when NO and H₂O₂ levels were simultaneously high in the same tissues. Using the NO scavenger it was also evidenced that NO generation is essential for cell death induction under copper or cadmium stress.

Ograniczanie wyników

1 Acta Physiologiae Plantarum

1 Acta Societatis Botanicorum Poloniae

1 BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology

3 Peto A.

2 Erdei L.

2 Kolbert Z.

2 Lehotai N.

1 Bajkan S.

1 Balogh P.

1 Daroczi L.

1 Feigl G.

1 Kovacs S.

1 Lisztes-Szabo Z.

1 Penksza K.

1 Tari I.

1 Tugyi N.

1 2015

1 2013

1 2011

Wyniki wyszukiwania

Cytokinin overproducing ipt-161 Arabidopsis shows altered NO generation and insensitivity to selenite

Quantifiable differences between phytolith assemblages detected at species level: analysis of the leaves of nine Poa species (Poaceae)

In vivo and in situ visualization of early physiological events induced by heavy metals in pea root meristem