000 03689nab a22005177a 4500
001 G66673
003 MX-TxCIM
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022 _a1573-5060 (Revista en electrónico)
040 _aMX-TxCIM
090 _aLook
_bunder journal title
100 1 _aReynolds, M.P.
_gGlobal Wheat Program
_8INT1511
_9831
245 0 0 _aEvaluating physiological traits to complement empirical selection for wheat in warm environments
260 _c1998
340 _aPrinted
500 _aPeer-review: Yes - Open Access: Yes|http://science.thomsonreuters.com/cgi-bin/jrnlst/jlresults.cgi?PC=MASTER&ISSN=0014-2336
520 _aThe response of spring wheat to heat stress has been determined in several hot wheat growing environments worldwide on different types of germplasm. Physiological data has been collected to identify potential traits to assist in the empirical breeding for heat tolerance. Initial studies focused on 10 established varieties to determine genetic diversity for heat tolerance, identify association between heat tolerance and traits measured, and evaluate genotype by environment interaction (G x E). Yields from over 40 hot environments were analysed for G x E, and relative humidity (RH) was identified as the major factor determining relative genotype ranking. Further analysis focused on 16 environments: those with low RH and relatively high yields, i.e., over 2.5 t ha(-1). For these environments, mean yield of lines correlated with a number of physiological traits measured in Mexico, including canopy temperature depression (CTD), membrane thermostability, leaf conductance and photosynthetic rate at heading, chlorophyll content during grainfilling, leaf internal CO2 concentration, and dark respiration. Morphological traits were measured in all environments and the following showed associations with yield: above ground biomass at maturity, days from emergence to anthesis and to maturity, grain number m(-2), and ground cover estimated visually after heading. Subsequent studies focused on breeding material, namely recombinant inbred lines derived from crosses between parents of contrasting heat tolerance, and 60 advanced breeding lines selected for performance under heat stress. The genetic basis for association between heat tolerance and CTD was established by demonstrating a correlation between the two traits in RILs (recombinant inbred lines). Data from RILs, as well as from the 60 advanced lines grown at several international locations, indicated CTD to be a powerful and robust selection criterion for heat tolerance
536 _aGlobal Wheat Program
546 _aEnglish
591 _a9809|Springer|ABC|EE|R98-99ANALY|1
594 _aINT1511|INT0610
595 _aCSC
595 _aSC
650 1 7 _aAgronomic characters
_gAGROVOC
_2
_91008
650 1 0 _91133
_aGenotype environment interaction
_gAGROVOC
650 1 0 _aHeat
_91143
650 1 0 _aPlant physiology
_91210
650 1 0 _91213
_aPlant response
_gAGROVOC
650 1 0 _aResearch projects
_91237
650 1 0 _aSelection
650 1 0 _91265
_aSoft wheat
_gAGROVOC
650 1 0 _aTemperature resistance
653 0 _aGenetic diversity CIMMYT
650 1 7 _aTriticum
_gAGROVOC
_2
_91295
650 1 0 _91296
_aTriticum aestivum
_gAGROVOC
650 1 7 _aWheat
_gAGROVOC
_2
_91310
650 1 7 _aPlant breeding
_gAGROVOC
_2
_91203
700 1 _aAgeeb, O.A.A.,
_ecoaut.
700 1 _aIbrahim, A.A.,
_ecoaut.
700 1 _aLarque Saavedra, A.,
_ecoaut.
700 1 _aQuick, J.S.,
_ecoaut.
700 1 _aSingh, R.P.
_gGlobal Wheat Program
_8INT0610
_9825
773 0 _tEuphytica
_gv. 100, no. 1-3, p. 85-94
942 _cJA
999 _c19066
_d19066