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Breeding strategies for improving cereal yield and stability under drought. Chapter 8

By: Ceccarelli, S | Improving Winter Cereals for Moisture-limiting Areas. Capri (Italy). 27-31 Oct 1985.
Contributor(s): Mekni, M.S [coaut.] | Nachit, M.M [coaut.] | Ortiz-Ferrara, G [coaut.] | Srivastava, J.P [coaut.] | Tahir, M [coaut.] | Van Leur, J [coaut.].
Material type: materialTypeLabelBookAnalytics: Show analyticsPublisher: 1987ISBN: 0-471-91650-1.Subject(s): Africa | Cultural methods | Gramineae | Hordeum | Meteorology and climatology | Miscellaneous plant disorders | Plant genetics and breeding | Progeny | Resistance to injurious factors | Seasons | Taxa | Triticum | Yields AGROVOC | Hybrids AGROVOCDDC classification: 94-002497 In: Srivastava, J.P.; Acevedo,-E.; Varma,-S. (ICARDA, Aleppo (Syria)); Porceddu,-E. (University of Tuscia, Viterbo (Italy). Inst. of Agricultural Biology) (eds.). National Research Council of Italy, Viterbo (Italy); International Center for Agricultural Research in the Dry Areas, Aleppo (Syria). Drought tolerance in winter cereals: proceedings of an international workshop. Chichester (UK). John Wiley and Sons. 1987. p. 101-114. (En)Summary: The main objective of the cereal-breeding activities of ICARDA is to increase yield and yield stability of barley, durum wheat, and bread wheat under the environmental fluctuations of rainfed agriculture. The key strategy employed involves targeted crosses and multilocation testing and selection of early segregating populations to identify genotypes capable of coping with the erratic and unpredicted climatic conditions of dry areas. A modified bulk method is used for the selection of early segregating populations. Additional strategies are the use of landraces and wild relatives of these crops. By using the traditional approach (selection for grain yield) it has been found that in barley the F3 families derived from F2 selected under unfavorable conditions were more vigorous in the early stages of growth, taller, earlier in heading, and with larger yields than the F3 derived from F2 selected under favourable conditions. A high and negative correlation coefficient was found between the drought susceptibility index and grain yield at the driest site, whereas at the wettest site the correlation coefficients were lower and in some cases positive. Similar results have been obtained with durum wheat and bread wheat advanced lines, indicating that, within the rainfall range of the trials (178-380 mm for barley and 277-600 mm for durum wheat and bread wheat), segregating populations and lines with the largest grain yield under favourable conditions are more drought susceptible than those with the largest grain yield under drought. This indicates the existence of certain traits which are desirable under drought but undesirable favourable conditions, or vice versa. These results, confirmed by the data from the 1985/86 season, indicate that selection under stress conditions is expected to be more efficient than selection under favourable conditions when dry areas become the target environmentCollection: AGRIS Collection
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Reprint Reprint CIMMYT Knowledge Center: John Woolston Library

Lic. Jose Juan Caballero Flores

 

AGRIS Collection 94-002497 (Browse shelf) Available
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8 tables; 2 fig. 23 ref. Summary (En)

The main objective of the cereal-breeding activities of ICARDA is to increase yield and yield stability of barley, durum wheat, and bread wheat under the environmental fluctuations of rainfed agriculture. The key strategy employed involves targeted crosses and multilocation testing and selection of early segregating populations to identify genotypes capable of coping with the erratic and unpredicted climatic conditions of dry areas. A modified bulk method is used for the selection of early segregating populations. Additional strategies are the use of landraces and wild relatives of these crops. By using the traditional approach (selection for grain yield) it has been found that in barley the F3 families derived from F2 selected under unfavorable conditions were more vigorous in the early stages of growth, taller, earlier in heading, and with larger yields than the F3 derived from F2 selected under favourable conditions. A high and negative correlation coefficient was found between the drought susceptibility index and grain yield at the driest site, whereas at the wettest site the correlation coefficients were lower and in some cases positive. Similar results have been obtained with durum wheat and bread wheat advanced lines, indicating that, within the rainfall range of the trials (178-380 mm for barley and 277-600 mm for durum wheat and bread wheat), segregating populations and lines with the largest grain yield under favourable conditions are more drought susceptible than those with the largest grain yield under drought. This indicates the existence of certain traits which are desirable under drought but undesirable favourable conditions, or vice versa. These results, confirmed by the data from the 1985/86 season, indicate that selection under stress conditions is expected to be more efficient than selection under favourable conditions when dry areas become the target environment

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