000			03370nam a22004937a 4500
001			G66674
003			MX-TxCIM
005			20211006082015.0
008			121211s ||||f| 0 p|p||0|| |
020			_a9974-7586-0-2
040			_aMX-TxCIM
072		0	_aF01
072		0	_aF62
082	0	4	_a633.1158 _bKOH
110	2		_aCentro Internacional de Mejoramiento de Maiz y Trigo (CIMMYT), Mexico DF (Mexico)
100	1		_aReynolds, M.P. _gGlobal Wheat Program _8INT1511 _9831
245	0	0	_aLa temperatura del follaje en el periodo posantesis y su relación con el rendimiento
260			_ala Estanzuela (Uruguay) _bINIA|CIMMYT : _c1998
340			_aPrinted
520			_aThe canopy temperature depression (CTD) refers to the cooling effect experience by the leaves when water evaporates from their surface. While the soil humidity has a major influence on CTD, genotypic effects also play a role under high yielding conditions caused by the heat and drought stress. CTD allows an indirect estimate of the stomatal conductance and is an integrative character being influenced by various important physiological processes including photosynthetic metabolism, vapor transpiration and the plant nutrition. The CTD measured on the sunny days, during the grain filling period, frequently demonstrated a strong relationship with the final yield. Under these conditions such a result is produced by the fact that the lines with a high number of grains (potential number of grains, sink) demonstrate their ability to fill the grain through superior photosynthetic metabolism (potential source). In other words, the differences found in the measurement of CTD under correct conditions allow a genetic resolution to visualize the potential yield, which is affected by the balance between potential growth and its partitioning. Quick and easy to measure, the CTD can be an attractive selection tool in the plant breeding. The experiments have been conducted by CIMMYT, in collaboration with the National Programs in India, Sudan, Bangladesh and Nigeria, to evaluate CTD as an early selection tool for tolerance to heat. CTD was measured on populations derived from the F2 bulks and recombinants of the selfed (inbred) lines (RILs) at various locations in Mexico. The results demonstrate that i. The measurement of CTD in bulks in Mexico was significantly correlated with their average performance at 11 other locations internationally ii. CTD was an excellent indicator of which of the bulks produced inbred lines tolerant to heat and iii. the CTD measured in RILs was significantly correlated with their performance.
536			_aGlobal Wheat Program
546			_aSpanish
591			_a9911|EE|R97-98PRESE|R99-00PROCE|AGRIS 0102
593			_aJose Juan Caballero
594			_aINT1511
595			_aCPC
650	1	0	_91800 _aCanopy _gAGROVOC
650	1	0	_aEnvironmental factors
650	1	0	_aFlowering
650	1	0	_aHeat _91143
650	1	0	_aInjurious factors
650	1	0	_aResearch projects _91237
650	1	0	_aYield factors
653	0		_aCIMMYT
653	0		_aINIA
650	1	7	_aWheat _gAGROVOC _2 _91310
650	1	0	_91313 _aYields _gAGROVOC
700	1		_aAgeeb, O.A.A., _ecoaut.
700	1		_aKholi, M.M.|Martino, D _eeds.
700	1		_aNagarajan, S., _ecoaut.
700	1		_aRazzaque, M.A., _ecoaut.
700	1		_9661 _aRajaram, S. _ecoaut.
942			_cBK
999			_c3961 _d3961