Testing for sex differences in biparental inbreeding and its consequences in a gynodioecious species [0.03%]
一种雌雄同体物种中亲代近交的性别差异检验及其影响研究
Lynda F Delph
Lynda F Delph
In many gynodioecious species cross-pollinated seeds from females outperform those from hermaphrodites. Using the gynodioecious alpine perennial Silene acaulis, I investigated whether this was the result of greater biparental inbreeding amo...
Reproductive strategy and population variability in the facultative apomict Hieracium pilosella (Asteraceae) [0.03%]
Hieracium pilosella（菊科半兼性无融合生殖植物）的无融合生殖策略及其居群变异研究
Gary J Houliston,Hazel M Chapman
Gary J Houliston
Molecular studies of apomictic plant species often detect more genotypic variation than predicted from their assumed reproductive mode. The two most commonly invoked mechanisms to explain these high levels of variation are recombination, vi...
Xiufu Zhang,Karen L Wilson,Jeremy J Bruhl
Xiufu Zhang
Spikelet morphology of 250 specimens of 47 species of Schoeneae was examined using light microscopy and scanning electron microscopy. We confirmed that spikelet structure in Schoeneae is cymose with a sympodial "rachilla." Monopodial spikel...
Tree fern growth strategy in the Late Devonian cladoxylopsid species Pietzschia levis from the study of its stem and root system [0.03%]
晚泥盆世cladoxylopsid植物Pietzschia levis的树状蕨生长策略：基于其茎干和根系的研究
Aude Soria,Brigitte Meyer-Berthaud
Aude Soria
Portions of stems from five new anatomically preserved specimens of Pietzschia levis from a new Late Devonian plant locality of eastern Tafilalt, Anti-Atlas (Morocco), were analyzed to complete the preliminary reconstruction previously done...
Age and sex-specific rates of leaf regeneration in the Mojave Desert moss Syntrichia caninervis [0.03%]
莫哈韦沙漠地钱苔Syntrichia caninervis各级群的再生速率和性别年龄差异研究
Lloyd R Stark,Lorenzo Nichols nd,D Nicholas McLetchie et al.
Lloyd R Stark et al.
The extremely skewed female-biased sex ratio in the desert moss Syntrichia caninervis was investigated by assessing the regeneration capacity of detached leaves. Juvenile, green, yellow-green, and brown leaves equating to approximately 0, 2...
New evidence from mitochondrial DNA of a progenitor-derivative species relationship between black spruce and red spruce (Pinaceae) [0.03%]
线粒体DNA提供的新证据表明红 SPRUCE 和黑 SPRUCE （松科）之间的祖先衍生物种关系
Juan P Jaramillo-Correa,Jean Bousquet
Juan P Jaramillo-Correa
Mitochondrial DNA (mtDNA) markers were used to assess the genetic diversity in allopatric populations of black spruce (Picea mariana [Mill.] BSP) and red spruce (P. rubens Sarg.). Patterns of mitochondrial haplotypes (mitotypes) were striki...
Chromosome studies of cheilanthoid ferns (Pteridaceae: Cheilanthoideae) from the western United States and Mexico [0.03%]
美国西部和墨西哥鳞毛蕨族凤尾蕨类(Cheilanthoideae)染色体研究
Michael D Windham,George Yatskievych
Michael D Windham
Although analyses of chromosome numbers represent a fundamental step in the study of any group of organisms, the xeric-adapted cheilanthoid ferns (Pteridaceae: subfamily Cheilanthoideae) have received little attention from cytogeneticists d...
Polarity of peatmoss (Sphagnum) evolution: who says bryophytes have no roots? [0.03%]
泥炭藓(Sphagnum)进化具有极性：谁说苔类植物没有根系？
A Jonathan Shaw,Cymon J Cox,Sandra B Boles
A Jonathan Shaw
The class Sphagnopsida (Bryophyta) includes two genera: Ambuchanania and Sphagnum. Ambuchanania contains just one rare species known from two Tasmanian localities, but Sphagnum comprises a speciose clade of mosses that dominates many wetlan...
Khidir W Hilu,Thomas Borsch,Kai Müller et al.
Khidir W Hilu et al.
Plastid matK gene sequences for 374 genera representing all angiosperm orders and 12 genera of gymnosperms were analyzed using parsimony (MP) and Bayesian inference (BI) approaches. Traditionally, slowly evolving genomic regions have been p...
Floral color change in Weigela middendorffiana (Caprifoliaceae): reduction of geitonogamous pollination by bumble bees [0.03%]
毛花翘枝红瑞木的花色变化及其对 Bombus 姑娘蜂传粉行为的影响
Takashi Y Ida,Gaku Kudo
Takashi Y Ida
We examined the significance of retaining color-changed flowers in pollination success of Weigela middendorffiana through a single visit of bumble bees. Inner parts of flowers changed color with age from yellow to red. In an investigation o...