Helen M. Stace's research while affiliated with University of Western Australia and other places
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Publications (11)
Evergreen or deciduous shrubs, rarely scandent, lianes, or trees, epiphytic or not, or herbs, rarely achlorophyllous and/or rhizomatous; hair roots present, with investing mycorrhizal fungal hyphae forming a loose covering over hair roots and penetrating only the outer cortical cells; indumentum unicellular and multicellular hairs, or unicellular h...
Cytological data for 188 species in 65 genera of Proteaceae were collated from
the literature. Excluding the occasional infrageneric polyploid, Proteaceae
have seven confirmed character states for chromosome number
(n = 14, 13, 12, 11, 10, 7, 5). Genera of
subfamily Persoonioideae are x = 7, and, on a
cytoevolutionary doctrine of ‘paleo-polyploidy’...
Chromosome numbers in Epacridaceae were collated from various authors and superimposed on to recent cladograms for the family. The results strongly indicate that reduction in chromosome number occurs with evolutionary advancement. Thus Epacridaceae, in common with ‘Ericaceaesens. strict.’ and ‘Vacciniaceaesens. strict.’, has evolved from a primitiv...
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...
The fruit galls on the Western Australian yellow tailflower, Anthocercis littorea (Solanaceae), reduce the reproductive potential of this plant, but their causative agent has, until now, been unknown. Our research has shown that a new gall midge species, Asphondylia anthocercidis, induces these galls. The larva, pupa, male and female of the new spe...
The Lobelioideae is a cosmopolitan group whose cytoevolution is discussed on a model of primitively high diploid chromosome numbers, in which x = 14 is relatively plesiomorphic and x = 21 may be even more plesiomorphic. This model is suggested from the high frequency of lobelioid genera with x = 14, the probably plesiomorphic condition of x = 17 in...
The Lobelioideae is a cosmopolitan group whose cytoevolution is discussed on a model of primitively high diploid chromosome numbers, in which x = 14 is relatively plesiomorphic and x = 21 may be even more plesiomorphic. This model is suggested from the high frequency of lobelioid genera with x = 14, the probably plesiomorphic condition of x = 17 in...
Chromosome numbers for 9 tribes and 73 genera ofRutaceae are examined for the probable chromosome base numbers in these taxa. There is abundant dysploidy and infrageneric polyploidy in the largeRutoideae/Toddalioideae complex. We found that x = 18 was typical for the tribesZanthoxyleae andToddalieae; probably ancestral in theBoronieae and perhaps i...
Chromosome counts for 30 taxa, representing five genera, are reported for Rutaceae subfamily Rutoideae, mostly in the Australasian tribe Boronieae. We found n = 10 for Boronia algida which is previously unreported in the genus, and a sterile triploid taxon in Zieria. Generic chromosome numbers of n = 18 in Zieria, n = 16 in Phebalium and n = 14 in...
Citations
... Cam-CYC1, in keeping with the general paucity of CYC1 gene duplications found in other groups, lacks the broad duplication pattern commonly seen in CYC2 and CYC3 genes correlating with a shift to bilateral symmetry [45,60,62]. However, there are duplications found in the Impares (F) clade as well as the giant lobelioids (U), likely due to independent ancient genome duplications [48,49,69]. ...
... Gray) Nied. son dos géneros monofiléticos y han sido considerados bien como uno único (WEBB, 1972;VILLAR, 1993;STEVENS & al., 2004) o como dos géneros distintos (DRUDE, 1889;EASTWOOD, 1934a;STEVENS, 1971;WELLS, 2000;CHRISTENHUSZ & al., 2017). ...
Reference: Flora Montiberica 78
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... Chromosome evolution of Boronia has been discussed by Smith-White (1954), Weston et al. (1984), Stace and Armstrong (1992), Stace and Patrick (1993), and Stace and Leach (1994). Smith-White (1954) concluded that the base number for Boronieae is n=9. ...
![[object Object]](https://i1.rgstatic.net/ii/profile.image/748192475910144-1555394395014_Q64/Greg-Leach.jpg)
... Asphondylia is a cosmopolitan genus currently comprising nearly 300 species. Fifteen species have been described from Australia previously, with 12 of them attributed to known host plants- (Kolesik, 1995(Kolesik, , 1997Kolesik et al., 1997Kolesik et al., , 2000Veenstra-Quah et al., 2007;. ...
![[object Object]](https://i1.rgstatic.net/ii/profile.image/474962176811009-1490251215809_Q64/Peter-Kolesik.jpg)
... A large variation in chromosome number exists across the clade, with every base number between 6 and 30 (and as high as 40) reported ( Lammers, 2007a ). A long-standing debate exists regarding polyploidy in the group, with little resolution about how to interpret chromosome counts in relation to genomic history ( Lammers, 1993 ; Stace and James, 1996 ). To date, the question of whether the high chromosome numbers found in Campanulaceae are the result of an ancestral polyploidy event, followed by descending disploidy or numerous, recent polyploidy events, has not been answered. ...
... They are often dominant in New Caledonian maquis on ultramafic rocks (Jaffré 2023) and are of particular interest because of their tendency to accumulate manganese, which confers to their metal-rich biomass some promising properties for organic chemistry (Losfeld et al. 2015). The only chromosome count available for this group is that of G. meisneri (n = 22, Carr and McPherson 1986), a much higher count than those typically observed in the family (from n = 10 to n = 14, Stace et al. 1998) and for Grevillea in particular (n = 10). With novel molecular phylogenetic data and new genome-size measurements, we sought to determine the number of times Grevillea colonised New Caledonia and obtain new lines of evidence for the origins of polyploidy in this group. ...
... Individu yang memiliki lebih dari dua set kromosom disebut dengan poliploid. Evodia 40 *Groppo et al., 2008;Desai, 1955;Stace & Armstrong, 1992;Marhold et al., 2019;Borgmann, 1964;Ghosh, 1960;Bajaj, 1994 Poliploid pada tumbuhan dapat terjadi secara alami ataupun dengan induksi artifisial. Poliploid pada genus Citrus dapat terjadi di alam karena kemampuan apomiksis, yaitu proses reproduksi aseksual membentuk biji tanpa terjadinya fusi gamet jantan dan betina. ...
... 94) confirma la existencia de poliploidía dentro del género. Wiltshire & Stace (1997) Grau (1987) indica para dos poblaciones de Proustia pungens Poepp. ex Less. ...
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... (2) winter bud scales absent; (3) corolla lobes densely and AEuniformly hairy; (4) corolla tube lacking fleshy scales inside (but hair tufts may be present); and (5) fruit a drupe, the endocarp not separating into pyrenes. In addition, the base chromosome number of 4 or 6 is a unique synapomorphy for the genus (Stace et al. 1997;Taaffe et al. 2001). ...
![[object Object]](https://i1.rgstatic.net/ii/profile.image/843455446147072-1578106857683_Q64/Alex-Chapman-6.jpg)
... Ruta pinnata (2n = 40, Stace et al., 1993) is a tetraploid hermaphrodite shrub with a conspicuous trunk, erect branches that can reach c. 2 m in height and up to 1.5-2.0 (4.0) m × 0.8-1.0 ...
