000			02436nab a22003257a 4500
001			67932
003			MX-TxCIM
005			20250620162550.0
008			240923s1967 -us|||p|op||| 00| 0 eng d
022			_a0011-183X
022			_a1435-0653 (Online)
024	8		_ahttps://doi.org/10.2135/cropsci1967.0011183X000700060030x
040			_aMX-TxCIM
041			_aeng
100	1		_aHelm, J.L. _936840
245	1	0	_aDevelopment of high-amylose corn (Zea mays L.) by the backcross method
260			_aUnited States of America : _bJohn Wiley & Sons, _c1967.
500			_aPeer review
520			_aAlternate backcrossing and selling has been employed to convert 5 corn belt inbreds to high-amylose inbreds, with selection in each generation for maximum amylose content. Genetically, the ultimate amylose content is determined by the ae gene in combination with a modifier complex. After three generations of backcrossing, all possible single crosses were made among the inbred lines from each backcross generation and among the recurrent parents. These single crosses were grown under three environments to determine the rate of convergence to the recurrent parent. Significant deviations from expected indicated that selection for maximum amylose content slowed the theoretical rate of convergence to the recurrent parent for such traits as whole kernel oil and protein content, test weight, shelling percentage, ear height, and grain yield. During successive generations of backcrossing the amylose level was maintained, indicating that selection for modifier genes was effective. Selection for positive modifiers in each backcross generation may have carried along linked genes, inhibiting the convergence to the recurrent parent for some traits. These results indicate that when selection pressure is applied for maximum amylose content, more than the expected number of backcrosses will be necessary to convert corn belt inbreds to equally desirable high-amylose inbreds.
546			_aText in English
650		7	_aAmylose _2AGROVOC _912673
650		7	_aZea mays _2AGROVOC _91314
650		7	_aCorn starch _2AGROVOC _926110
650		7	_aGenes _2AGROVOC _93563
650		7	_aCross-breeding _2AGROVOC _926603
700	1		_aFergason, V.L. _936841
700	1		_aZuber, M.S _95432
773	0		_dUnited States of America : John Wiley & Sons, 1967. _gv. 7, no. 6, p. 659-662 _tCrop Science _wG444244 _x0011-183X
942			_2ddc _cJA _n0
999			_c67932 _d67924