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Transmittibility of ear resistance to European corn borer in sweet corn testcrosses and resistance stability

By: Joyce, M.S.
Contributor(s): Davis, D.W [coaut.].
Material type: materialTypeLabelArticlePublisher: 1995ISSN: 0003-1062.Subject(s): America | Genetic engineering | Genetic inheritance | Gramineae | Insecta | Lake states usa | Lepidoptera | North America | North central states usa | Noxious animals | Ostrinia | Pests | Pests of plants | Progeny | Pyralidae | Resistance to injurious factors | USA | ZeaDDC classification: 97-033970 In: American Society for Horticultural Science (USA). (Jan 1995). v. 120(1) p. 107-111Summary: Concern over insecticide usage for control of European corn borer (Ostrinia nubilalis Hubner) in sweet corn (Zea mays L.) in recent years has increased the need for genetic control. Our objectives were to determine the degree of ear feeding resistance transmitted by resistant breeding lines to testcrosses and to investigate the relationship between resistance and both ear silk channel length, and infestation level. Testcrosses averaged 35% acceptable ears compared to 7% for two commercial control hybrids and 45% for the lines per se when artificially infested at the ear tip at mid-silk at two locations. Generally, resistance in the testcrosses was closer to the resistance level of the resistant parent, indicating good combining ability for resistance. Heterosis above the resistant parent was found in 8 of 12 testcrosses. Across entries, ears having relatively longer silk channel length tended to have less damage but the relationship was not strong (r2 = 0.24, P < 0.01). When silk channels were artificially shortened at infestation, resistance levels were lower, but five of seven lines had a higher proportion of acceptable ears than did the control hybrid. Across increasing levels of infestation from 50 to 200 neonate larvae per ear eight of nine lines had higher resistance (P < 0.05) than the controlCollection: AGRIS Collection
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Article CIMMYT Knowledge Center: John Woolston Library

Lic. Jose Juan Caballero Flores

 

AGRIS Collection 97-033970 (Browse shelf) Available
Total holds: 0

references US (DNAL 81 SO12)

Concern over insecticide usage for control of European corn borer (Ostrinia nubilalis Hubner) in sweet corn (Zea mays L.) in recent years has increased the need for genetic control. Our objectives were to determine the degree of ear feeding resistance transmitted by resistant breeding lines to testcrosses and to investigate the relationship between resistance and both ear silk channel length, and infestation level. Testcrosses averaged 35% acceptable ears compared to 7% for two commercial control hybrids and 45% for the lines per se when artificially infested at the ear tip at mid-silk at two locations. Generally, resistance in the testcrosses was closer to the resistance level of the resistant parent, indicating good combining ability for resistance. Heterosis above the resistant parent was found in 8 of 12 testcrosses. Across entries, ears having relatively longer silk channel length tended to have less damage but the relationship was not strong (r2 = 0.24, P < 0.01). When silk channels were artificially shortened at infestation, resistance levels were lower, but five of seven lines had a higher proportion of acceptable ears than did the control hybrid. Across increasing levels of infestation from 50 to 200 neonate larvae per ear eight of nine lines had higher resistance (P < 0.05) than the control

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