000			02908nam a22004577a 4500
001			G80339
003			MX-TxCIM
005			20240919021105.0
008			121211s ||||f| 0 p|p||0|| |
020			_a970-648-120-6
040			_aMX-TxCIM
072		0	_aF30
072		0	_aH20
082	0	4	_a338.16 _bFRI
100	1		_aVerma, B.N. _uIntegrated Approaches to Higher Maize Productivity in the New Millennium
110	0		_aCentro Internacional de Mejoramiento de Maiz y Trigo (CIMMYT) Kenya
111	2		_a7. Proceedings of the Eastern and Southern Africa Regional Maize Conference _cNairobi (Kenya) _d5-11 Feb 2002
245	0	0	_aGrey leaf spot disease of maize-loss assessment, genetic studies and breeding for resistance in Zambia
260			_aNairobi (Kenya) _bKARI|CIMMYT : _c2002
300			_ap. 60-65
340			_aPrinted
520			_aWith the introduction and spread of a previously unreported disease, Grey Leaf Spot (GLS) of maize in the country in the mid 1990s, all old bybrids succumbed to the disease. These bybrids were developed by Government research supported by various donors and availed to Zambia Seed Company Ltd. (Zamseed) who had exclusive rights to produce and market government-bred material. Phasing out of donor support at this critical stage created a vacuum in maize breeding. To fill the gap, the company was forced to start a research department to take control of its research Deeds. In response to the GLS problem, the research department adopted a dual pronged approach to firstly improve genetic resistance of old bybrids as a short-term measure and, secondly, initiated a long-term resistance breeding programme. Replacement of susceptible parents by resistant versions in old hybrids brought remarkable improvement in most hybrids. Yield losses due to GLS ranged from 28 to 54% with an average loss of 33.5%. In diallel studies both GCA and SCA variances were found highly significant for GLS indicating the importance of both additive and non-additive components although GCA was relatively more important. GCA effects of parents were good indicators of hybrid performance in general but failed to explain performance of all bybrids. Screening of germplasm revealed abundance of resistance in local material and prospects of breeding for resistance appear good.
546			_aEnglish
591			_a0409|AGRIS 0401|AL-Maize Program
593			_aJuan Carlos Mendieta
595			_aCPC
650	1	7	_aGermplasm _gAGROVOC _2 _91136
650	1	0	_aLeaf area
650	1	7	_aMaize _gAGROVOC _2 _91173
650	1	0	_aPlant developmental stages
650	1	7	_aPlant diseases _gAGROVOC _2 _91206
650	1	0	_aSpots
650	1	0	_aYield factors
650	1	0	_aZambia
653	0		_aCIMMYT
653	0		_aKARI
650	1	7	_aGenetic resources _gAGROVOC _2 _91127
650	1	7	_aPlant breeding _gAGROVOC _2 _91203
700	1		_aFriesen, D.K.|Palmer, A.F.E. _eeds.
942			_cBK
999			_c7352 _d7352