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Ligule anatomy and morphology of five Poa species

100%

Szabo Z. K., Papp M., Daroczi L.

Acta Biologica Cracoviensia. Series Botanica

2006

tom 48

nr 2

The morphological and anatomical features of ligules of some Poa species (members of Poa pratensis group: P. pratensis, P. angustifolia, P. humilis; species outside the group: P. compressa, P. alpina) were studied by light and scanning electron microscopy. They are described in detail, emphasizing interspecific differences and habitat-dependent variation of shape, length and prickle hair density. All ligules studied are membranous, without veins and stomata-like structures, and may have only a few mesophyll-like cells. The P. pratensis ligule rarely contains short prickle hairs. Short leaflike prickle hairs occur densely on the ligule of P. angustifolia. The ligule of P. humilis is densely covered by long prickle hairs. The long prickle hairs of P. compressa end in elongated, curved apexes. There are no prickle hairs on the ligule of P. alpina. The density of hairs on the abaxial surface is habitat-dependent for all species studied. Ligule anatomy in the P. pratensis group is quite uniform, leading them to be grouped as closely related species, but the line differences identified are useful for their identification.

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

76%

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.

Ograniczanie wyników

1 Acta Biologica Cracoviensia. Series Botanica

1 Acta Societatis Botanicorum Poloniae

2 Daroczi L.

1 Balogh P.

1 Kovacs S.

1 Lisztes-Szabo Z.

1 Papp M.

1 Penksza K.

1 Peto A.

1 Szabo Z. K.

1 2015

1 2006

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Ligule anatomy and morphology of five Poa species

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