Sidney H James's research while affiliated with University of Western Australia and other places
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Publications (7)
Complex hybridity is a rare diploid genetic system of plants, extensively characterized in Oenothera, in which heterozygosity for one or more reciprocal translocations is maintained by means of autogamy and a balanced lethal system. It is visible at metaphase I of meiosis as rings or chains of chromosomes held together by terminalized chiasmata. Ph...
Is genetic diversity a reliable indicator of evolutionary capability? A
comparative study of genetic systems in Australian native plants, particularly
from south-west Australia, suggests the primitive condition to be
recombinationally capable with low allelic diversity. Diversity has
accumulated in some nursery lineages in association with lethal e...
A population of Laxmannia R. Br. (Angiospermae, Anthericaceae) near Collie, Western Australia, combines the taxonomically significant sessile inflorescences of L. sessiliflora Dcne. (n = 4) and the derived breeding system of L. ramosa Lindl. (n = 4). It exhibits a polymorphism for seed-aborting lethal equivalents, significant levels of self-pollina...
Allozyme diversity was surveyed at 15 loci across 22 populations of the hydrophilous seagrass Posidonia australis (Hook. f). Substantial genetic variation was detected (HT = 0.311) with a high proportion of this variation partitioned between populations (GST = 0.623). The high value of GST is attributed to large geographical distances between many...
Outcrossing rates, seed yields and the incidence of seed abortion were estimated in different-sized populations of a rare clonal mallee, Eucalyptus argutifolia Grayling and Brooker. Multi-locus estimates of the outcrossing rate were high in most populations (tm = 0.79–0.96), and no relationship between population size and the outcrossing rate was e...
Western Australian Drosera L. species include one annual and many tuberous and pygmy perennials. In 20 species or subspecies, 17 taxa were self-incompatible (SI) and three were self-compatible (SC), as assessed by patterns of seed set and pollen tube growth. All SI species were clonal (tubers or gemmae), but two SC species were clonal (gemmae) and...
Few detailed studies have been published on genetic variation in seagrasses except those on the monoecious Zostera marina L. or the hermaphrodite Posidonia australis Hook. f. This paper presents allozyme, RFLP and reproductive biology data on Amphibolis antarctica (Labill.) Sonder&Aschers, one of the 75 per cent of all seagrass species which are di...
Citations
... Hopper (2009) argued that OCBIL flora will have some resistance to the deleterious effects of small population size (either a consequence of anthropogenic threats such as land clearance or natural processes) and the capacity to maintain genetic diversity because of genetic, cytogenetic, life-history or phenotypic adaptations. These adaptations include clonality, extreme longevity, self-incompatibility, flower traits facilitating pollination by mobile vertebrates, purged genetic load, dysploidy and genomic coalescence, and increased genome size (James, 1996(James, , 2000Hopper, 2009;. James (1996James ( , 2000 proposed that such adaptations would be characteristic of some and possibly many components of the SWAFR flora that have primarily self-pollinating, hermaphroditic genetic systems and are adapted to high levels of inbreeding in relatively small populations. ...
... Hardesty et al., 2005;Cibrián-Jaramillo et al., 2009;Riba-Hernández et al., 2014). However, other studies have also found limited diversity and significant inbreeding coefficients in dioecious species due to reduced effective population sizes caused by clonality (Waycott, 1996), biased sex ratios (Vandepitte et al., 2009) or variance in male or female reproductive success (Luna, Epperson & Oyama, 2005). Almost all dioecious plants show entomophilous pollination associated with small generalist insects (Bawa & Opler, 1975;Bawa, 1980). ...
![[object Object]](https://i1.rgstatic.net/ii/profile.image/953289977892864-1604293450019_Q64/Michelle-Waycott.jpg)
![[object Object]](https://i1.rgstatic.net/ii/profile.image/272454903922703-1441969719461_Q64/Diana-Walker-2.jpg)
... Given the geographic disjunction, strong genetic differentiation, and maintenance of heterozygosity, there is no necessity nor would it be appropriate to augment the population with seed material from distant conspecific Denmark populations. Further research could assess the genetic quality of seeds collected within the population via a mating system analysis of progeny, which would reveal the extent of inbreeding and hybridisation in progeny arrays and therefore the quality and purity of seed stock for ex situ conservation purposes (Kennington and James 1997a;Field et al. 2009;Bradbury et al. 2016). The absence of other E. virginea populations in the area is likely to result in high levels of self-fertilisation and/or biparental inbreeding in Meelup progeny, at least at fertilisation. ...
... [19][20][21]. In the following period of Miocene from 60 to 40 million years ago, on the dates of 27 and 28 December, an impressive geologic event of continental drift happened in the Tethys Sea [9], leading to the geographic separation between Australia and Antartide platforms [22,23]. Meantime, the Tethys basin began to dry up and break up to originate in its western region, the Mediterranean Sea, for the sliding of the ocean crust under the continental one. ...
... geitonogamous selfing). Although clonal plants can be predicted as rather SI, as suggested by a study on Australian Droseraceae (Chen et al. 1997), SI or SC association with clonality seems to be dependent also on a particular clonal strategy, as documented by comparative studies of the closely related species Eichhornia azurea and E. crassipes (Barrett 2015 and citations therein). Geitonogamy is often considered a consequence of traits related to higher plant attractiveness, e.g. ...
... & Belgrano (Marais & Reilly 1978, Guaglianone & Belgrano 2003, pertenece a la familia Asparagaceae, subfamilia Lomandroideae; esta última agrupa 14 géneros y 178 especies (Stevens 2001, APG III 2009, Chase et al. 2009). En esta subfamilia se ha descrito autoincompatibilidad genética para algunas especies del género Cordyline (Beever 1981, Beever 1983, Beever & Parkes 1996, Hinkle 2007) y autocompatibilidad en dos especies del género Laxmannia (James et al. 1999). Dado que T. plumosum es una hierba perenne, se espera que sea mayormente autocompatible, pues existe una tendencia significativa a nivel mundial, que indica que las especies herbáceas son principalmente autocompatibles (Raduski et al. 2012). ...
... Biogeography: Bussell et al. (2002) and Chen et al. (2016) placed Isotoma in Australia as its ancestral region. Knox and Li (2017) placed Hypsela and Lithotoma in Australasia as their ancestral region. ...
