Topic
Panicum effusum
About: Panicum effusum is a research topic. Over the lifetime, 2 publications have been published within this topic receiving 40 citations.
Papers
TL;DR: Homopholis belsonii was well supported as the most basalmember of the ingroup, and the three species ofDigitaria formed a well-supported clade, and were the sister group toEntolasia marginata.
Abstract: The taxonomy ofHomopholis C.E.Hubb. is revised, and anew genus Whalleya K.E.Wills & J.J.Bruhl isdescribed. Relationships among the known species ofHomopholis (H. belsonii C.E.Hubb.,H. proluta F.Muell., and a putative species,H. sp. nov.), and the relationships betweenHomopholis and other genera within the Paniceae were investigated. Morphological and anatomical data forHomopholis and selected species ofDigitaria and Panicum were analysed phenetically and cladistically. The value and contribution ofcharacters to the findings were assessed. In the phenetic analyses, threedistinct clusters of species were formed. The first cluster includedDigitaria coenicola (F.Muell.) Hughes,D. divaricatissima (R.Br.) Hughes andD. papposa (R.Br.) P.Beauv.; the second,Panicum effusum R.Br.,P. queenslandicum Domin var.queenslandicum and P. simileDomin; and the third, H. sp. nov.,H. proluta, H. belsonii andP. subxerophilum Domin. Specimens ofH. belsonii noticeably separated from the other threespecies. For the cladistic analyses, species ofEntolasia and Thyridolepis were used as outgroup taxa. One most parsimonious tree was produced.Homopholis belsonii was well supported as the most basalmember of the ingroup. The three species ofDigitariaformed a well-supported clade.Panicum effusum, P. queenslandicumvar. queenslandicum and P. simileformed a well-supported clade, and were the sister group toEntolasia marginata (R.Br.) Hughes andE. stricta (R.Br.) Hughes.Panicum subxerophilum was in a clade (=Whalleya) with H. sp. nov. andH. proluta, with P. subxerophilumand H. proluta as sister species.
17 citations
TL;DR: Test the hypothesis that the developmental divergence of bundle sheath and mesophyll cells would occur earlier when these two tissues had different ontogenetic origins than when these tissues had the same origin, and measured the development of major veins in each species, it is indicated thatOntogenetic origin of PCR cells from procambium could determine the timing of at least some developmental events.
Abstract: The two C4 Panicum species examined differ in C4 acid decarboxylation type and in developmental origin of bundle sheaths in major veins of their leaf blades In Panicum effusum RBr (NAD-malic enzyme type) both mesophyll (PCA) and chlorenchymatous bundle sheath (PCR) cells are derived from ground meristem In contrast, in Panicum bulbosum HBK (NADPmalic enzyme type), bundle sheath cells are derived from procambium, while mesophyll develops from ground meristem To test the hypothesis that the developmental divergence of bundle sheath and mesophyll cells would occur earlier when these two tissues had different ontogenetic origins (in P bulbosum) than when these tissues had the same origin (in P effusum), the development of major veins in each species was investigated We measured cell length and cross sectional area, plastid and mitochondrial number, plastid area, vacuole area fraction, wall thickness and fraction adjacent to intercellular space using direct and digitizer measurements of transmission electron micrographs of leaf cross sections of successive developmental stages Many of the statistically significant changes in the structural parameters measured occurred late in development of both species The magnitude of developmental change in P effusum PCR cells was sometimes more dramatic, viz changes in cell and PCR plastid area, and in mitochondrion number per cell However, earlier divergence of PCR and PCA length and volume, and wall fraction adjacent to intercellular space in P bulbosum than in P effusum indicates that ontogenetic origin of PCR cells from procambium could determine the timing of at least some developmental events
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2000 | 1 |
| 1986 | 1 |