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Morpho-physiological traits of wheat varieties under dryland cinditions

By: Mirzakhmedov, M | Centro Internacional de Mejoramiento de Maiz y Trigo (CIMMYT) | Tbilisi (Georgia) 14-17 Jun 2004.
Contributor(s): Bedoshvili, D [ed.].
Material type: materialTypeLabelBookAnalytics: Show analyticsPublisher: Tbilisi (Georgia) CIMMYT : 2004Description: p. 275-276.Subject(s): Biomass AGROVOC | Dry farming | Ecology | Environmental factors | Experimentation | Morphogenesis | Plant physiology | Varieties | Wheat | CIMMYTDDC classification: 633.1147 Summary: To realize yield potential, new wheat varieties should be properly placed by various agro-ecological zones. Observation of morphological and physio- logical traits of new varieties in various environments and under different management practices allows for evaluation of their resistance to various enviro- nmental factors. Material of the study included input-respo- nsive varieties such as Giymatli- 2/17, Gobustan, and Azametli-95, as well as check variety Bezostaya-l. Field experiments were conducted under dryland conditions at Gobustan Breeding Experimental Station ofRI of Agriculture of Azerbaijan. The study suggests that maximum values for the leave area of Gobustan were observed in the 2nd decade of May (45.6 thou m2/ha). While the highest values for the same trait for the other varie- ties under study (Giymatli-2/17 , Azametli-95 and Bezostaya-l) were recorded by the end of May: 49.6 thousand m2/ha, 46.5 thousand m2/ha and 47 thousand m2/ha, respectively. The similar trend of increase of the assimi- lation area ofthe stems was obsereved until the late May. In June soil moisture content decreased due to low rainfall and resulted in rapid reduction of the leaf assimilation area, while the stems remained functional a little longer. It is known that at the maturity stage, when leaves are practically non- functional, the spike plays a significant role in determination of yield. The data suggests that the area ofthe spikes of new varieties is bigger than that of check Bezostaya-l and they remain green for a longer period, which enables them to participate more actively in grain-filling. Final yield is known to depend on the total amount of dry biomass and its rational allocation between grain and the remaining parts of the wheat plant (harvest index). The highest amounts of dry biomass ofthe leaves for all varieties were recor- ded by the end of the 2nd decade of May, while the highest amounts of stem biomass were observed by the end of May. Giymatli-2/17 has form accomulated more dry leaf biomass than the other genotypes, while higher amounts of the dry stem biomass were recorded for Bezostaya-l. It should be noted that amount of dry biomass of spikes at heading and an thesis was about the same for all genotypes. After completion off1owering, spike dry biomass of the improved varieties increased faster than that of the check variety. Thus, the results of the study provided evi- dence that to obtain high yield under dryland con- ditions, it is necessary to promote early development of high assimilation area of the leaves and stems as well as active transportation and deposition ofthe photo-assimilates in grain prior the beginning of the reproductive stage.Collection: CIMMYT Publications Collection
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Conference proceedings CIMMYT Knowledge Center: John Woolston Library

Lic. Jose Juan Caballero Flores

 

CIMMYT Publications Collection 633.1147 BED (Browse shelf) 1 Available 1O630072
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Abstract only

To realize yield potential, new wheat varieties should be properly placed by various agro-ecological zones. Observation of morphological and physio- logical traits of new varieties in various environments and under different management practices allows for evaluation of their resistance to various enviro- nmental factors. Material of the study included input-respo- nsive varieties such as Giymatli- 2/17, Gobustan, and Azametli-95, as well as check variety Bezostaya-l. Field experiments were conducted under dryland conditions at Gobustan Breeding Experimental Station ofRI of Agriculture of Azerbaijan. The study suggests that maximum values for the leave area of Gobustan were observed in the 2nd decade of May (45.6 thou m2/ha). While the highest values for the same trait for the other varie- ties under study (Giymatli-2/17 , Azametli-95 and Bezostaya-l) were recorded by the end of May: 49.6 thousand m2/ha, 46.5 thousand m2/ha and 47 thousand m2/ha, respectively. The similar trend of increase of the assimi- lation area ofthe stems was obsereved until the late May. In June soil moisture content decreased due to low rainfall and resulted in rapid reduction of the leaf assimilation area, while the stems remained functional a little longer. It is known that at the maturity stage, when leaves are practically non- functional, the spike plays a significant role in determination of yield. The data suggests that the area ofthe spikes of new varieties is bigger than that of check Bezostaya-l and they remain green for a longer period, which enables them to participate more actively in grain-filling. Final yield is known to depend on the total amount of dry biomass and its rational allocation between grain and the remaining parts of the wheat plant (harvest index). The highest amounts of dry biomass ofthe leaves for all varieties were recor- ded by the end of the 2nd decade of May, while the highest amounts of stem biomass were observed by the end of May. Giymatli-2/17 has form accomulated more dry leaf biomass than the other genotypes, while higher amounts of the dry stem biomass were recorded for Bezostaya-l. It should be noted that amount of dry biomass of spikes at heading and an thesis was about the same for all genotypes. After completion off1owering, spike dry biomass of the improved varieties increased faster than that of the check variety. Thus, the results of the study provided evi- dence that to obtain high yield under dryland con- ditions, it is necessary to promote early development of high assimilation area of the leaves and stems as well as active transportation and deposition ofthe photo-assimilates in grain prior the beginning of the reproductive stage.

English

0408|AGRIS 0401|AL-Wheat Program

Juan Carlos Mendieta

CIMMYT Publications Collection

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