Studies in Oat Evolution: A Man's Life with Avena by Gideon Ladizinsky (auth.)

By Gideon Ladizinsky (auth.)

The ebook is predicated at the author's existence time event in exploring and studying the genus Avena. It describes a few nice occasions in oat learn and minor tales alongside the best way. it will likely be of curiosity and cost to all these operating with oats and to scholars and scientists of crop evolution, together with these facing gathering and holding wild genetic resources.

A first half bargains with the morphology and taxonomy of the genus and a class in accordance with the organic species suggestion is gifted. a different half is dedicated to the author’s learn accomplishments during this genus. It describes morphological characters distinguishing among diploids and tetraploids of sequence Eubarbatae, the genetic relationships among them, and the mode of starting place of the tetraploid shape. The part Denticulatae, to which the typical oat belongs, is commonly handled. extra, oat domestication and the newly domesticated protein wealthy A. magna are defined. a 3rd half bargains with wild genetic assets of oat.

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2 Series Eubarbatae 35 Fig. 6 Hybrid combinations between A. strigosa (S), A. prostrara (P), A. longiglumis (L) and their artificially produced amphidiploids Fig. 7 A univalent, bivalent, two trivalents, and pentavalent in A. strigosa x A. longiglumis hybrid evolved. Was it formed after the doubling of the chromosome number of the diploid or has it pre-existed in the diploid forms of series Eubarbatae. To examine the possibility of the pre-existence of such a gene at the diploid level I artificially created interspecific diploid hybrids in which a given genome was presented in a single dose with the presence of another genome.

The atlantica type was restricted mainly to sandy soil but some populations were found on brown soil. How the spikelet disarticulation pattern was established in a member of series Eubarbatae is an interesting and intriguing question. Another question; what is the adaptive value of such a disarticulation pattern in the dry habitat where the atlantica type is a native? A possible reason for that could be survival improvement by prolonging germination ability. In oat species in which the dispersal unit is the whole spikelet, the seed of the lower floret germinates in the following winter while the seed of the upper florets stay dormant and might germinate in the second, third, or fourth year.

Strigosa ssp. hirtula (2n = 14) and b A. 1 Variation in bristle length in mixed stand of A. barbata (2n = 28) and A. strigosa ssp. hirtula (2n = 14) Bristle length in mm Total 2 ssp. hirtula A. barbata 2 3 6 4 8 5 6 7 8 9 10 11 7 1 8 7 3 2 6 3 4 30 27 were determined as A. barbata. On the basis of that survey I visited populations of ssp. hirtula in Turkey, Cyprus, Crete, and the Iberian Peninsula where I could corroborate the ecological requirements of this diploid oat and its spatial contact with the tetraploid A.

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