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Genetic analysis of abiotic stress tolerance in tropical maize hybrids

By: Betrán, F.J | Centro Internacional de Mejoramiento de Maiz y Trigo (CIMMYT), Mexico DF (Mexico).
Contributor(s): Beck, D.L [coaut.] | CIMMYT|EARO | Edmeades, G.O [coaut.] | Sánchez, C [coaut.] | Banziger, M [coaut.] | Ribaut, J.M [coaut.].
Material type: materialTypeLabelBookAnalytics: Show analyticsPublisher: Addis Ababa (Ethiopia) CIMMYT|EARO : 1999Description: p. 69-71.ISBN: 92-9146-065-6.Subject(s): Deficiency diseases | Drought AGROVOC | Genetic parameters | Maize | Nitrogen | Research projects | Resistance to injurious factors | Tropical zones | CIMMYT | Tropical maize | Zea mays AGROVOC | Hybrids AGROVOCSummary: Drought and low soil nitrogen (N) are limiting factors in farmer's fields throughout the world. Developing maize genotypes with better drought and low soil N tolerance has been a priority of breeders and physiologists at CIMMYT. This study examines: a) the genetic control and modes of gene action for drought and low N tolerance, b) dosage rate for drought and low N tolerance in hybrids, and c) combining ability for a group of promising lines under stress and non-stress conditions. Seventeen parental lines and their diallel were evaluated separately in trials planted side-by-side under drought stress, low N stress, and optimal conditions. Results show that as drought stress increased so did the importance of GCA and additive genetic effects. Non-additive effects were more important under low N stress and a significant number of cross-overs were observed between the GCA of lines under low and high N. Dosage effects were important under drought but not under low N, suggesting the need for including drought tolerant parents on both sides of a hybrid to achieve acceptable drought tolerance. CML339 had the highest GCA under drought and across environments. Hybrids including the lines CML341, CML344, and CML254 had good performance under low N.Collection: CIMMYT Staff Publications Collection
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Conference proceedings CIMMYT Knowledge Center: John Woolston Library

Lic. Jose Juan Caballero Flores

 

CIMMYT Staff Publications Collection CIS-2670 (Browse shelf) 1 Available 649313
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Drought and low soil nitrogen (N) are limiting factors in farmer's fields throughout the world. Developing maize genotypes with better drought and low soil N tolerance has been a priority of breeders and physiologists at CIMMYT. This study examines: a) the genetic control and modes of gene action for drought and low N tolerance, b) dosage rate for drought and low N tolerance in hybrids, and c) combining ability for a group of promising lines under stress and non-stress conditions. Seventeen parental lines and their diallel were evaluated separately in trials planted side-by-side under drought stress, low N stress, and optimal conditions. Results show that as drought stress increased so did the importance of GCA and additive genetic effects. Non-additive effects were more important under low N stress and a significant number of cross-overs were observed between the GCA of lines under low and high N. Dosage effects were important under drought but not under low N, suggesting the need for including drought tolerant parents on both sides of a hybrid to achieve acceptable drought tolerance. CML339 had the highest GCA under drought and across environments. Hybrids including the lines CML341, CML344, and CML254 had good performance under low N.

Generation Challenge Program|Research and Partnership Program

English

0103|AL Maize Program|R98-99CIMPU|AGRIS 0102|AJ|3

Jose Juan Caballero

INT1888|INT1991

CIMMYT Staff Publications Collection

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