000			03081nam a22004337a 4500
001			G65025
003			MX-TxCIM
005			20211006073347.0
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		_aSchechert, A. _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	_aGeneration means and combining ability analysis of resistance to Setosphaeria turcica in African maize
260			_aAddis Ababa (Ethiopia) _bCIMMYT : _c1997
340			_aPrinted
520			_aNorthern (syn. Turcicum) leaf blight (NLB) is a serious and widespread disease of maize (Zea mays L.) throughout the most productive maize growing regions of eastern Africa. The only economical way to control the pathogen (Setosphaeria turcica, anamorph Exserohilum turcicum) and thus the disease, is by genetic resistance. Based on a full diallel with seven inbred lines [five resistant from eastern and southern Africa, KARI and CIMMYT germplasm, respectively, and two susceptible from Europe and the USA] a generation means analysis was conducted. The considered material encompassed 164 entries from the diallel, including the seven parental lines, their F1, F2, BC1 and BC2 generations, plus checks. The trial was planted in the short rainy season 1994 in Kenya and Zimbabwe, and was artificially infected. Incubation period as well as disease severity on four successive dates were recorded on a single-plant basis. From the individual disease ratings, the area under the disease progress curve (AUDPC) was calculated. The study revealed that (i) the heritability of all resistance parameters was high or very high, (ii) reciprocal effects of resistance to NLB were not significant, (iii) general combining ability effects were of more importance than specific combining ability effects at early growth stages with increasing importance of specific combining ability effects towards maturity, and (iv) additive gene action was predominant concerning incubation period while both additive and dominance effects were determining the AUDPC. Some crosses showed substantial heterosis for resistance.
546			_aEnglish
591			_a9801|AGRIS 9702
593			_aJose Juan Caballero
595			_aCPC
650	1	0	_aAfrica
650	1	0	_aCombining ability _92367
650	1	0	_aDiallel crossing
650	1	0	_aDisease control
650	1	0	_aKenya _91167
650	1	7	_aPlant diseases _gAGROVOC _2 _91206
650	1	0	_aSetosphaeria turcica _92254
650	1	0	_aZimbabwe
653	0		_aCIMMYT
650	1	0	_91314 _aZea mays _gAGROVOC
700	1		_aGeiger, H.H., _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.
700	1		_aWelz, H.G., _ecoaut.
942			_cPRO
999			_c9532 _d9532