Polyploidy and ecological transfiguration in Achillea

Polyploidy and ecological transfiguration in Achillea.

P olyploidy is a prominent chromosomal/genetical feature in most flowering plant groups (1, 2). Change in the number of chromosome sets (and thus gene dosage) is an important factor in the genesis of new species, in part because plants with higher ploidal levels often have ecological tolerances that differ from those of their progenitors. Plant evolutionists have been very interested in the ori...

Polyploidy and ecological adaptation in wild yarrow.

Chromosome evolution in flowering plants is often punctuated by polyploidy, genome duplication events that fundamentally alter DNA content, chromosome number, and gene dosage. Polyploidy confers postzygotic reproductive isolation and is thought to drive ecological divergence and range expansion. The adaptive value of polyploidy, however, remains uncertain; ecologists have traditionally relied o...

‘Transfiguration’

Ecological Requirements, Antioxidant Activity and New Chemotype Essential Oil from Achillea millefolium L. and Achillea micrantha Wild. in North of Iran (Golestan Province)

In many field observation, ecological equipment, phenology and ethnopharmacological data of Achillea millefolium L. and A. micrantha Wild. were studied. The inflorescences of plants were collected in different locations of Golestan province: Chaharbagh (2000 m) and Dozan (2200 m) respectively. Essential oils were obtained by steam distillation (Clevenger) and analyzed by gas chromatography-mass...

Death and transfiguration of a problem.

rt 38.5 C ....................................................... ........... 392 DEGRADATION OF VIRAL RNA DOES NOT REQUIRE PROTEIN SYNTHESIS. 393 REPLICASE ACTIVITY AT OPTIMAL AND SUPRAOPTIMAL TEMPERATURES................................................................... 394 SOMETHING IS DESTROYED AT SUPRAOPTIMAL TEMPERATURES........ 394 WIHERE DOES THE RIBONUCLEASE COME FROM? ...... ...........