000			02763nam a22003977a 4500
001			G65024
003			MX-TxCIM
005			20240919021110.0
008			121211s ||||f| 0 p|p||0|| |
020			_a92-9146-025-7
040			_aMX-TxCIM
072		0	_aF30
072		0	_aH20
082	0	4	_a633.15 _bEAS No. 5
100	1		_aNhlane, W.G. _uMaize Productivity Gains through Research and Technology Dissemination. Proceedings of the Eastern and Southern Africa Regional Maize Conference, 5; Arusha (Tanzania); 3-7 Jun 1996
110	2		_aCentro Internacional de Mejoramiento de Maiz y Trigo (CIMMYT), Mexico DF (Mexico)
245	0	0	_aGenetic analysis of maize streak virus disease in maize
260			_aAddis Ababa (Ethiopia) _bCIMMYT : _c1997
340			_aPrinted
520			_aMaize streak virus (MSV) transmitted by Cicadulina leafhoppers, causes severe yield losses in Malawi and many other countries south of the Sahara. Although yield losses due to MSV can be controlled to some extent by agronomic practices such as early planting and seed treatment with systemic insecticides, a much more reliable and environmentally sound strategy would be to breed cultivars with a high level of tolerance to MSV. The purpose of this study was to determine the relative contribution of additive and non-additive variation in the genetic determination of resistance to maize streak virus and to estimate the general and specific combining ability effects of inbred lines using diallel analysis. A better understanding of the genetics of MSV disease resistance is needed to support plant breeding programs as this would aid selection of parents, breeding procedures and population size for managing segregating populations. The results from a 10 x 10 diallel experiment, between streak resistant and streak susceptible lines, carried out at CIMMYT (Zimbabwe), showed that additive gene action was important in the inheritance of maize streak virus disease. The results showed that MSV resistance is polygenic and that it is inherited quantitatively. Recurrent selection procedures that utilize additive effects would be the logical approach to developing resistant maize hybrids in Malawi.
546			_aEnglish
591			_a9801|AGRIS 9702
593			_aJose Juan Caballero
595			_aCPC
650	1	0	_aDiallel crossing
650	1	0	_aDisease control
650	1	0	_aMalawi
650	1	7	_aPlant diseases _gAGROVOC _2 _91206
653	0		_aCIMMYT
650	1	0	_91314 _aZea mays _gAGROVOC
650	1	0	_aMaize streak virus _gAGROVOC _91947
650	1	7	_aPlant breeding _gAGROVOC _2 _91203
700	1		_aCaligari, P.D.S., _ecoaut.
700	1		_aRansom, J.K.|Palmer, A.F.E.|Zambezi, B.T.|Mduruma, Z.O.|Waddington, S.R.|Pixley, K.V.|Jewell, D.C. _eeds.
942			_cPRO
999			_c9531 _d9531