000			02735nab a22004217a 4500
001			G78858
003			MX-TxCIM
005			20230928163524.0
008			210616s2003 xxu|||p|op||| 00| 0 eng d
022			_a0016-6731
022			_a1943-2631 (Online)
024		8	_ahttps://doi.org/10.1093/genetics/165.3.1521
040			_aMX-TxCIM
041			_aeng
072		0	_aA50
072		0	_aF63
090			_aCIS-3906
100	1		_aGrimanelli, D. _920329
245	1	0	_aHeterochronic expression of sexual reproductive programs during apomictic development in Tripsacum
260			_aBaltimore (USA) : _bGenetics Society of America, _c2003.
340			_aComputer File
500			_aPeer review
500			_aPeer-review: Yes - Open Access: Yes|http://science.thomsonreuters.com/cgi-bin/jrnlst/jlresults.cgi?PC=MASTER&ISSN=1943-2631
520			_aSome angiosperms reproduce by apomixis, a natural way of cloning through seeds. Apomictic plants bypass both meiosis and egg cell fertilization, producing progeny that are genetic replicas of the mother plant. In this report, we analyze reproductive development in Tripsacum dactyloides, an apomictic relative of maize, and in experimental apomictic hybrids between maize and Tripsacum. We show that apomictic reproduction is characterized by an alteration of developmental timing of both sporogenesis and early embryo development. The absence of female meiosis in apomictic Tripsacum results from an early termination of female meiosis. Similarily, parthenogenetic development of a maternal embryo in apomicts results from precocious induction of early embryogenesis events. We also show that male meiosis in apomicts is characterized by comparable asynchronous expression of developmental stages. Apomixis thus results in an array of possible phenotypes, including wild-type sexual development. Overall, our observations suggest that apomixis in Tripsacum is a heterochronic phenotype; i.e., it relies on a deregulation of the timing of reproductive events, rather than on the alteration of a specific component of the reproductive pathway.
546			_aText in English
591			_a0401|AL-ABC Program
650		7	_aApomixis _2AGROVOC _910507
650		7	_aTripsacum dactyloides _2AGROVOC _912043
650		7	_aSexual reproduction _2AGROVOC _910509
650		7	_aDevelopment _2AGROVOC _91549
700	1		_aGarcía, M. _920333
700	1		_aKaszas, E. _920330
700	1		_aPerotti, E. _920331
700	1		_aLeblanc, O. _920332
773	0		_tGenetics _n632652 _gv. 165, no. 3, p. 1521-1531 _dBaltimore (USA) : Genetics Society of America, 2003. _wG444332 _x0016-6731
856	4		_yAccess only for CIMMYT Staff _uhttps://hdl.handle.net/20.500.12665/555
942			_cJA _2ddc _n0
999			_c24522 _d24522