Category: Uncategorized

DRIVERS OF DIOECY. "Dioecy is thought to have evolved independently many times. These transitions may have been favoured by the advantage of avoiding self-pollination and the associated inbreeding depression, by the advantage of sexual specialization or by a combination of both." https://lnkd.in/guzeMTD View in LinkedIn

TWO GENE SYSTEM. “Male and female organs are both initiated in developing garden asparagus flower buds, and differences in the timing of cessation of male pistil development and degeneration of female anthers are suggestive of a two-gene sex determination system.” https://lnkd.in/gKA5C8N View in LinkedIn

ANGIOSPERM PATHWAYS. "About 6 % of an estimated total of 240 000 species of angiosperms are dioecious. The main precursors of this sexual system are thought to be monoecy and gynodioecy. A previous angiosperm-wide study revealed that many dioecious species have evolved through the monoecy pathway; some case studies and a large body of theoretical research also provide evidence in support of the gynodioecy pathway." https://lnkd.in/guzeMTD View in LinkedIn

RECENT DIOECY. “In garden asparagus, X and Y chromosomes are cytologically homomorphic, and YY “supermale” genotypes are viable and produce fertile pollen, suggesting a recent origin of dioecy and sex chromosomes in the genus.” https://lnkd.in/gKA5C8N View in LinkedIn

OLD GENE, NEW FUNCTION. "One finding which may result from this work will be the way in which genomes have evolved to reassign genes (or duplicate copies of them) to new functions." https://lnkd.in/gb3zS32 View in LinkedIn

VIRAL REMAINS OR GENOME DUPLICATIONS. “Earlier work suggested that the increased genome size may have been due to increased rates of retrotransposon accumulation in diecious Asparagus genomes, but synteny analysis of the reference genome assembly revealed evidence for at least two ancient whole genome duplications.” https://lnkd.in/gKA5C8N View in LinkedIn

GENE DOSAGE. "Although the notion that dioecy may be controlled by simple mutations affecting male or female functions may hold true for some simple plant systems, the situation is clearly more complicated in the case of those dioecious plants which have developed sex chromosomes of the X to autosome dosage type, where dosage sensing mechanisms involving genes analogous to the numerator and denominator genes found in drosophila have developed." https://lnkd.in/gb3zS32 View in LinkedIn

GENE DOUBLING. “The haploid genome size of diecious Asparagus species has been characterized as being nearly double that of hermaphroditic species.” https://lnkd.in/gKA5C8N View in LinkedIn

EXAPTED GENES. "It is likely that sex determining genes may be present in the genomes of hermaphroditic plants, but may have quite different functions in some plants." https://lnkd.in/gb3zS32 View in LinkedIn

'Space nation' Asgardia takes off http://www.cnn.com/style/article/asgardia-satellite-launch/index.html View in LinkedIn