000			01947nam a2200217Ia 4500
003			MX-MdCICY
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040			_cCICY
090			_aB-17740
245	1	0	_aEvolution and improvement of cultivated amaranths with reference to genome relationship among A. cruentus, A. powellii and A. retroflexus
490	0		_vGenetic Resources and Crop Evolution, 46(3), p. 219-224, 1999
520	3		_aMeiotic studies were carried out in four accessions of three grain species, viz. Amaranthus cruentus, A. powellii and A. retroflexus and their F1 hybrids to elucidate the genome relationships between the cultivated and wild types and the cytogenetical mechanisms involved in speciation. All the three species were morphologically distinct and cytologically uniform with 17 bivalents at metaphase I. Morphologically the interspecific hybrids were either intermediate or had an overall dominance of wild parents. Chromosome analysis at meiotic metaphase I in the F1 interspecific hybrids of A. powellii with the Indian and Mexican accessions of A. cruentus showed an average of chromosome association of 1.0 IV + 0.10 III + 14.78 II + 0.14 I and 1.0 IV + 0.45 III + 14.20 II + 0.25 I and 5.81percent in the former and 8.44percent in the later pollen grain fertility, respectively and that of A. retroflexus with A. cruentus (Indian and Mexican)showed almost similar chromosomal associations. These studies show close genomic homology amongst all these three species involving certain chromosomal aberrations resulting in their evolution.
650	1	4	_aAMARANTHUS
650	1	4	_aEVOLUTION GENOME
650	1	4	_aRELATIONSHIP STRUCTURAL
650	1	4	_aCHROMOSOME CHANGES
700	1	2	_aPandey, R. M
856	4	0	_uhttps://drive.google.com/file/d/16odRjnIf0gVrZ0Wg5-VaHYurCELB3P5M/view?usp=drivesdk _zPara ver el documento ingresa a Google con tu cuenta: @cicy.edu.mx
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