000			03304nab a22004937a 4500
001			G58324
003			MX-TxCIM
005			20240919020944.0
008			121211b |||p||p||||||| |z||| |
022			_a1573-5060 (Revista en electrónico)
040			_aMX-TxCIM
041	0		_aEn
043			_aNL
072		0	_aF30
090			_aCIS-2806
100	1		_aVasal, S.K.
245	0	0	_aImprovement in selfed and random-mated generations of four subtropical maize populations through S3 recurrent selection
260			_c1995
340			_aPrinted
500			_aPeer-review: Yes - Open Access: Yes|http://science.thomsonreuters.com/cgi-bin/jrnlst/jlresults.cgi?PC=MASTER&ISSN=0014-2336
520			_aIn maize (Zea mays) source germplasm having tolerance of inbreeding is needed for the derivation of productive inbred lines. Germplasm with non-temperate adaptation generally suffers greatly from inbreeding depression (ID). The objective of the present study was to improve four white subtropical populations for tolerance to ID through S3 recurrent selection. Two cycles of selection were conducted and the effect of selection was evaluated in the first selfed (S1) and random-mated (Syn-2) generations. To complete each cycle, 200 to 250 S3 progenies were evaluated and 15 to 20 superior ones selected for recombination in each population. Selection was practised for high grain yield, vigour and other agronomic traits. The S1 and Syn-2 generations of the original (C0) and improved (C1, C2) populations were evaluated in a split-split plot design, with populations in main plots, generations in subplots and cycles in sub-subplots. In all populations, S1 and Syn-2 generations of C2 were significantly higher yielding than the C0 and the linear gain per cycle varied from 16.3 to 28.8% in the S1 generation and 5.5 to 10.7% in the Syn-2 generation. Selection reduced the anthesis-silking interval but slightly increased plant height, grain moisture and days to silk. An increase in plant height was expected because of emphasis on vigour during selection. For grain yield, ID decreased from 48.4% in C0 populations to 37.9% in C2, indicating an improved tolerance of inbreeding. Furthermore, the selection accumulated favourable alleles; and Pop. 42 seemed to be the best source population for deriving high yielding inbred lines. It may be concluded that S3 recurrent selection was effective in improving grain yield and the improved populations would provide better germplasm sources for the derivation of productive inbred lines
536			_aGenetic Resources Program
546			_aEnglish
591			_aMP|Springer|R95ANALY|3
594			_aCCJL01
595			_aCSC
650	1	7	_aInbred lines _gAGROVOC _2 _91155
650	1	0	_aLowland
650	1	0	_aRandom mating
650	1	0	_aResearch projects _91237
650	1	0	_aSelection
650	1	0	_aSelfing
650	1	0	_aTropical zones
653	0		_aCIMMYT
650	1	0	_91314 _aZea mays _gAGROVOC
650	1	0	_91151 _aHybrids _gAGROVOC
700	1		_aDhillon, B.S., _ecoaut. _92240
700	1		_aMcLean, S.D., _ecoaut.
700	1		_aSrinivasan, G., _ecoaut.
700	1		_aZhang, S.H., _ecoaut.
700	1		_aCrossa, J. _gGenetic Resources Program _8CCJL01 _959
773	0		_tEuphytica _n649386 _gv. 83, no. 1, p. 1-8
942			_cJA
999			_c17264 _d17264