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Morpho-physiological basis for breeding drought and low-N tolerant maize genotypes in India

By: Dass, S | Centro Internacional de Mejoramiento de Maiz y Trigo (CIMMYT), Mexico DF (Mexico).
Contributor(s): Dang, Y.P [coaut.] | Dhawan, A.K [coaut.] | Edmeades, G.O.|Banziger, M.|Mickelson, H.R.|Pena-Valdivia, C.B [eds.] | Kumar, S [coaut.] | Singh, N.N [coaut.].
Material type: materialTypeLabelBookAnalytics: Show analyticsPublisher: Mexico, DF (Mexico) CIMMYT : 1997ISBN: 968-6923-93-4.Subject(s): Drought resistance | Drought stress AGROVOC | India | Nitrogen content | Plant anatomy | Plant physiology | Resistance to injurious factors | CIMMYT | Zea mays AGROVOC | Genotypes AGROVOC | Plant breeding AGROVOCDDC classification: 633.153 Summary: Development of drought and low-N tolerant maize genotypes serves more than one purpose. It not only reduces the cost of cultivation but is also an effective way of sustaining maize production in drought prone areas. For the last 25 years, the area under maize in India has stagnated at around 6 million ha. India is currently producing about 10 million tons per year of maize, but productivity is low compared to most temperate countries - partly because of drought and low soil fertility. More than 80% of the maize area is rainfed and almost all the Indian soils where maize is grown are poor in indigenous N. India has set a target of 18 million tons of maize production per annum by the year 2000. There is little scope for increasing area under irrigation, so maize will continue to be grown in rainfed conditions. Hence, productivity has to be improved in order to meet the increasing demand for maize. This may be possible by developing short duration, drought and low-N tolerant hybrid varieties of maize. Hybrids are not only high yielding but tend to be more stable and tolerant to drought and infertility than open-pollinated varieties. Only limited research has been conducted on drought and low N tolerance in India. Studies normally consider these two factors separately, but efforts have been made to combine both stresses to obtain more comprehensive information. Selection for stress tolerance is difficult due to inconsistent expression of genetically controlled characters in stress environments. Some studies conclude that higher yielding genotypes under normal conditions will also be the better yielders under drought and sub-optimal nitrogen, so breeding for high yield may be the most appropriate approach for developing drought and low N tolerance. Screening germplasm under artificially created stress conditions can be expected to enhance gains derived from normal testing. Testing under both conditions may attain more quickly the goals of high yield and stress tolerance.Collection: CIMMYT Publications Collection
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Conference proceedings CIMMYT Knowledge Center: John Woolston Library

Lic. Jose Juan Caballero Flores

 

CIMMYT Publications Collection 633.153 EDM (Browse shelf) 1 Available V624179
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Development of drought and low-N tolerant maize genotypes serves more than one purpose. It not only reduces the cost of cultivation but is also an effective way of sustaining maize production in drought prone areas. For the last 25 years, the area under maize in India has stagnated at around 6 million ha. India is currently producing about 10 million tons per year of maize, but productivity is low compared to most temperate countries - partly because of drought and low soil fertility. More than 80% of the maize area is rainfed and almost all the Indian soils where maize is grown are poor in indigenous N. India has set a target of 18 million tons of maize production per annum by the year 2000. There is little scope for increasing area under irrigation, so maize will continue to be grown in rainfed conditions. Hence, productivity has to be improved in order to meet the increasing demand for maize. This may be possible by developing short duration, drought and low-N tolerant hybrid varieties of maize. Hybrids are not only high yielding but tend to be more stable and tolerant to drought and infertility than open-pollinated varieties. Only limited research has been conducted on drought and low N tolerance in India. Studies normally consider these two factors separately, but efforts have been made to combine both stresses to obtain more comprehensive information. Selection for stress tolerance is difficult due to inconsistent expression of genetically controlled characters in stress environments. Some studies conclude that higher yielding genotypes under normal conditions will also be the better yielders under drought and sub-optimal nitrogen, so breeding for high yield may be the most appropriate approach for developing drought and low N tolerance. Screening germplasm under artificially created stress conditions can be expected to enhance gains derived from normal testing. Testing under both conditions may attain more quickly the goals of high yield and stress tolerance.

English

9801|AGRIS 9702

Jose Juan Caballero

CIMMYT Publications Collection

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