Month: September 2022

FAVORED GENE SETS. "How does our new view of the genesis of modern flowering plant genome organization impact our understanding of plant evolution, form, and function?" http://www.amjbot.org/content/early/2015/10/09/ajb.1500320 View in LinkedIn

SPIN CYCLE CENTRALITY. "I suggest that this perspective is central to much of plant biology, a proposal bolstered by the realization that the size and functional diversification of contemporary plant multi-gene family structures, gene expression patterns, and genic contexts all represent the culmination of this repeated “wash–rinse–repeat” cycle of polyploidization followed by nonrandom and incomplete diploidization." http://www.amjbot.org/content/early/2015/10/09/ajb.1500320 View in LinkedIn

DEVILS AND DETAILS. "Hybridization between diploids and tetraploids can lead to new allopolyploid species, often via a triploid intermediate. Viable triploids are often produced asymmetrically, with greater success observed for “maternal-excess” crosses where the mother has a higher ploidy than the father." https://lnkd.in/es_dhAz View in LinkedIn

MECHANISMS OF PLOIDY. "Polyploids (individuals carrying more than two sets of chromosomes) can originate through a variety of pathways. These include the somatic doubling of chromosomes in meristematic tissue during mitosis and, perhaps more commonly, unreduced gametes." https://lnkd.in/es_dhAz View in LinkedIn

ODD-PLOIDY TRANSIENTS. "When the formation of polyploids involves fusion of gametes with different ploidy levels (e.g., reduced and unreduced gametes, or between a diploid and a tetraploid), an individual with an unbalanced ploidy level (e.g., a triploid) will be formed. In most cases, these odd-ploidy individuals are a transient phase in polyploid formation, leading to the eventual production of higher ploidy, stable lineages such as tetraploids and hexaploids." https://lnkd.in/es_dhAz View in LinkedIn

SPECIES BARRIERS. "Odd-ploidy levels represent a significant challenge to overcome in the formation of polyploids because interploidy crosses often have strong postzygotic reproductive barriers, severely reducing hybrid viability and fertility. However, evidence from both natural and experimental systems has shown that interploidy crosses can sometimes produce odd-ploidy offspring that are viable." https://lnkd.in/es_dhAz View in LinkedIn

TABOO LINE. "The term “triploid block” has been coined to describe the regular observation that interploidy crosses, specifically between diploids and tetraploids, often result in early hybrid inviability and sterility." https://lnkd.in/es_dhAz View in LinkedIn

BREAKING SPECIES BARRIERS. "The ability to overcome the triploid block can be asymmetric, with offspring viability dependent on whether the maternal or paternal parent had the higher ploidy level." https://lnkd.in/es_dhAz View in LinkedIn

"ASYMMETRIC HYBRIDIZATION has considerable potential for influencing population genetic processes. It generates a predictable bias in cytoplasmic inheritance and, in some cases, can promote unidirectional introgression." https://lnkd.in/es_dhAz View in LinkedIn

OVERCOMING INCOMPATIBILITY. "Repeated backcrossing between an asymmetrically produced hybrid and its paternal pollen source may lead to “cytoplasmic capture,” in which the mitochondria and chloroplasts of the maternal progenitor are combined with the nuclear genome of the paternal progenitor." https://lnkd.in/es_dhAz View in LinkedIn