(ii) Since genes of several secondary metabolic pathways in fungi are arranged in gene clusters, such as penicillin (), sterigmatocystins (), gibberellins (), and ergot alkaloids (), there is a high probability of identifying other genes encoding enzymes of the ABA pathway by a chromosome-walking approach. Indeed, preliminary analyses identified at least two genes downstream of bcaba1 that are candidates for further ABA biosynthetic genes (V. Siewers and P. Tudzynski, unpublished data).
Inrecent decades, with the advances of new technologies, many genomes of economiccrop plants (several tens of them) have been sequenced and assembled. Theavailability of these sequenced genomes allows us to conduct more explicit andcutting-edge investigations that enable scientists to effectively deciphermolecular mechanisms related to the domestication and improvement of these cropplants. For example, upon assembly and analysis in allotetraploid genome ofextensively grown Upland cotton () with componentdiploid genomes of its probable progenitors, cultivated cotton ()and wild cotton (), differential regulation of plant hormoneethylene and cellulose biosynthesis were observed on the cell wall expansion ofsingle-celled natural fibers. Furthermore, comparative analysis of the cacao () genome with cotton and other genomes revealed close evolutionaryrelationships with the common ancestral paleopolyploid origin among many plantspecies. Likewise, the coffee genome provided insight into the convergentevolution of caffeine biosynthesis, the grapevine genome revealed ancestralhexaploidization while the oilseed genome was used forstudying early allopolyploid evolution. In addition, the peach () genome helped identify unique patterns of genetic diversity,domestication and evolution. The two whole genome duplication events in thepalaeopolyploid soybean () were found to be related withsignificant gene diversification, gene loss as well as chromosomerearrangements. Assembly of the cucumber () genomeresulted in unraveling a new biochemical pathway leading towards bitness, aunique taste from cucumber. Besides these and many more published draft genomesof economic crop plants, we welcome reports of any other unfinished butemerging genomes of economic importance.
McFarland KN, Liu J, Landrian I, Godiska R, Shanker S, Yu F, et al