000			02932nam a22003737a 4500
001			G70493
003			MX-TxCIM
005			20211006081058.0
008			121211s ||||f| 0 p|p||0|| |
020			_a92-9146-058-3
040			_aMX-TxCIM
072		0	_aF01
072		0	_aF30
090			_aLook under series title
100	1		_aHavazvidi, E.K. _uRegional Wheat Workshop for Eastern, Central and Southern Africa, 10; University of Stellenbosch, South Africa; 14-18 Sep 1998
110	2		_aCentro Internacional de Mejoramiento de Maiz y Trigo (CIMMYT), Addis Ababa (Ethiopia)
245	0	0	_aGenotype x environment interaction for alpha-amylase enzyme activity in wheat grain
260			_aAddis Ababa (Ethiopia) _bCIMMYT : _c1999
340			_aPrinted
520			_aThe alpha-amylase enzyme activity in the whole meals of six wheat genotypes that were grown in different altitude areas, over different planting dates in Zimbabwe in winter 1996, was measured to ascertain the genotypic differences and the effect of different cultural conditions on the expression of this phenomenon. The enzyme activity was tested using the conventional Perten Hagberg Falling Number method. High genotypic differences in the expression of alpha-amylase activity were observed. The cultivar Deka, which is a Veery x Musala cross, gave the lowest Falling Numbers. Scarlet, a red grained new release out of a CIMMYT cross, gave the highest and most stable Falling Numbers. The cultivar Scan and three other cultivars that are all Sengwa onto Veery type crosses, gave intermediate Falling Number values that lie within the ideal range of 250 seconds. A general decrease in Falling Numbers with increase in altitude was noted. Steeper decline in Falling Numbers occurred at altitudes above 1,200 m a.s.1., particularly in less stable genotypes like Deka. Earlier planting by about two weeks before the recommended time of early to mid-May, in Zimbabwe, decrease Falling Numbers by about 40 seconds. About 20 seconds in Falling Numbers were gained by allowing wheat to store for about a month after reaping. Low Falling number problems have been encountered in Zimbabwe due to the use of Veery types that are inherently unstable in the expression of alpha-amylase enzyme activity; and also due to pre-harvest sprouting caused by early rains. New varieties that are more stable with some showing high tolerance to sprouting in the field, have been released. The agronomic and baking features of these will be presented.
546			_aEnglish
591			_a0007|AGRIS 0101|AL-Wheat Program
593			_aJose Juan Caballero
595			_aCPC
650	1	0	_aAlpha amylase
650	1	7	_aCrop management _gAGROVOC _2 _91061
650	1	0	_aEnzymes
650	1	0	_91133 _aGenotype environment interaction _gAGROVOC
650	1	0	_aZimbabwe
653	0		_aCIMMYT
650	1	7	_aTriticum _gAGROVOC _2 _91295
650	1	0	_91134 _aGenotypes _gAGROVOC
942			_cPRO
999			_c4532 _d4532