000			02390nam a22003377a 4500
001			G90337
003			MX-TxCIM
005			20170719154725.0
008			121211s ||||f| 0 p|p||0|| |
040			_aMX-TxCIM
090			_aCIS-5223
100	1		_aWelcker, C. _uGeneration Challenge Program, Annual Research Meeting; Benoni (South Africa); 12-16 Sep 2007
245	0	0	_aIs there a common genetic determinism between source and sink strengths in maize plants subjected to water deficit ?
260			_c2007
300			_ap. 35
340			_aPrinted
500			_aAbstract only
520			_aLeaf growth and Anthesis-Silking Interval (ASI) are the main determinants of source and sink strengths of maize via their relations with light interception and yield, respectively. They depend on the abilities of leaves and silks to expand under fluctuating environmental conditions, so we raise the possibility that they may have a partly common genetic determinism. Maximum leaf elongation rate and the slopes of the responses to evaporative demand and soil water status were measured on the Phenodyn platform, in a mapping population which segregates for ASI. ASI was measured in 3 and 5 fields under well-watered and water deficit, respectively. For each RIL, the maximum elongation rate per unit thermal time was reproducible over several experiments in the absence of water deficit. It was accounted for by 5 QTLs, among which three co-localised with QTLs of ASI in well-watered conditions. The alleles conferring high leaf elongation rate conferred a high silk elongation rate. The responses of leaf elongation rate to evaporative demand and to predawn leaf water potential had 3 QTLs in common with ASI of plants under water deficit. The alleles for leaf growth maintenance were those for maintained silk elongation rate. These results may have profound consequences for modelling the genotype x environment interaction and for designing drought tolerant ideotypes
536			_aGeneration Challenge Program
546			_aEnglish
593			_aLucia Segura
594			_aINT1991
595			_aCSC
700	1		_aBencivenni, C., _ecoaut.
700	1		_aBoussuge. B., _ecoaut.
700	1		_aFuad Hassan, A., _ecoaut.
700	1		_aTardieu, F., _ecoaut.
700	1		_aTurc, O., _ecoaut.
700	1		_9835 _aRibaut, J.M. _gIntegrated Breeding Platform _8INT1991 _ecoaut.
942			_cPRO
999			_c6152 _d6152