摘要:

Nuclear genome analysis using RFLPs and RAPDs has been assessed within different species of the genusBrachypodiumP. Beauv. and representatives of other grasses in order to determine the characteristics of theBrachypodiumgenome and to establish its evolutionary position in relation to other Pooideae. Distinctive features of theBrachypodiumgenome are its small size, the low amount of repetitive DNA, the lack of restriction fragment length polymorphisms within the genus for the assayed probe/enzyme combinations, and the genomic variability demonstrated at species level by random DNA amplification. These molecular studies confirmBrachypodiumas an isolated ancient genus best placed in its own tribe (Brachypodieae). Its relationships to other tribes Bromeae, Triticeae, Poeae are resolved, Brachypodieae being the earliest tribe to diverge from this core of pooids. Within the genus two major Old World clades are distinguishable: an annual clade, represented only byB.distachyon; and a perennial clade, represented by all the other species studied (exceptB. mexicanum). The perennial American speciesB. mexicanumappears equally attached to these two clades. RFLP data were found to be useful in obtaining phylogenies at generic and higher rank levels, whereas the highly variable RAPD data were more suitable for resolving interspecific and intraspecific evolutionary pathways.

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1995.tb02590.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY

摘要:

Thapsia garganicaL. andT. transtaganaBrot. are classified as synonymous inFlora Europaea.In the present investigation significant differences between the two taxa with regard to fruit anatomy and phytochemistry are demonstrated and they are considered as two separate species. Microscopic studies revealed a distinct difference in number and position of secretory spaces in the pericarp of fruits from the two species and in addition pronounced differences were found in the presence of thapsigargins, the bioactive constituents of the two species. Quantitative HPLC analyses of thapsigargins were carried out on different plant organs fromT. garganicaandT. transtaganacollected from various locations. Thapsigargin, thapsigargicin, nortrilobolid and thapsivillosin I and J were dominant compounds in all organs ofT. garganicawhereas none of these compounds could be detected in any organ ofT. transtagana.On the contrary, thapsitranstagin and trilobolid were main thapsigargins ofT. transtagana. T. garganicamay include two chemotypes, as trilobolid was detected in some specimens ofT. garganicaonly. As this is the first time trilobolid has been detected in these two species, it was isolated from both and identified by1H NMR‐spectroscop

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1995.tb02591.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY

摘要:

Species ofCoriariaare wind‐pollinated and self‐compatible. Discrepancies in the literature regarding sex expression in the genus may be attributed to inter‐ and intra‐floral dichogamy. The southern hemisphere species and the HimalayanC. terminalisare evergreen phanerophytes or high elevation hemicryptophytes, which flower on new wood. Their racemes are many‐flowered and are produced singly (terminal) or more usually in pairs in the axils at each node, and contain protogynous, hermaphrodite flowers. The northern hemisphere species are deciduous phanerophytes, which flower on old wood. Their racemes are few‐flowered but aggregated in axillary clusters of up to 12 per node; sex expression is andromonoecious or monoecious (depending on species), with inter‐floral protandry and intra‐floral protogyny. In this lineage of species the evolution of a deciduous habit, the presentation of an initial male phase (inter‐floral protandry), and the aggregation of many, few‐flowered racemes at each node are interpreted as responses to selection pressures in the seasonal climate of a northern, mixed w

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1995.tb02592.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY

摘要:

Archaeopteris notosaria sp. nov.based on one fertile and numerous sterile leafy branches is described from the Grahamstown By‐Pass locality, Witpoort Formation (Witteberg Group) Upper Devonian, and represents the first unequivocal record of the genus in southern Africa. This occurrence is used, in its palaeogeographical context, to support the suggestion that climatic gradients in Late Devonian times were less steep than they are at presen

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1995.tb02593.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY

摘要:

In a survey of the karyology ofNonea, which completes an examination of Spanish Boragineae, the chromosome number forN. echioides(L.) Roemer&Shultes is reported for the first time. Relationships between the genera that are included in the tribe Boragineae are discussed, considering chromosomal and morphological characters and the habit of the plants.

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1995.tb02594.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY

摘要:

The classification of the genusIlliciumL. (Illiciaceae) is revised within the Malesian phytogeographical region, using multivariate statistical analyses as required. Seven species are recognized,viz. I. kinabaluenseA.C. Sm. (Sabah),I. peninsulareA.C. Sm. (Malay Peninsula),I. philippinenseMerr. (Philippines),I. ridleyanumA.C. Sm. (Malay Peninsula),I. stapfiiMerr. (Sabah and Sarawak),I. sumatranumA.C. Sm. (Sumatra) andI. tenuifolium(Ridl.) A.C. Sm. (Malay Peninsula, and newly recorded in Sumatra, Sabah and Sarawak).I. cauliflorumMerr. is reduced to synonymy withI. stapfii, and the existing infraspecific classification ofI. tenuifoliumis shown to be invalid. The implications of the present research on the supraspecific classification of the genus are discussed. A key is provided for the identification of taxa, with new taxonomic descriptions.

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1995.tb02588.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY

ISSN:0024-4074    

DOI:10.1111/j.1095-8339.1995.tb02589.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY