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期刊名称: Journal of Agricultural Science
Volume:154    Issue:4        Page:647-661
ISSN:0021-8596

Genetic gains in grain yield under nitrogen stress following three decades of breeding for drought tolerance and Striga resistance in early maturing maize期刊论文

作者: Badu-Apraku B Fakorede M.A.B Oyekunle M Akinwale R.O
DOI:10.1017/S0021859615000593

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页码: 647-661
被引频次: 9
出版者: CAMBRIDGE UNIV PRESS,Cambridge University Press
期刊名称: Journal of Agricultural Science
ISSN: 0021-8596
卷期: Volume:154    Issue:4
语言: English
摘要: Breeding for resistance to Striga hermonthica Del. (Benth) and tolerance to drought has been a major strategy to improve maize (Zea mays L.) production and productivity in West and Central Africa during the last three decades. The three decades consisted of three breeding periods or eras based on the germplasm and methodologies used; that is, 1988-2000, 2001-06 and 2007-11. A total of 50 early maturing cultivars, combining Striga resistance with drought tolerance were developed, including 15, 16 and 19 cultivars for the three periods, respectively. Although the cultivars were not selected intentionally for low-nitrogen (N) tolerance, it was hypothesized that tolerance to low-N had been significantly improved while selecting for drought tolerance and Striga resistance. This hypothesis was tested by evaluating the 50 cultivars in 2010 and 2011 in Nigeria at Mokwa and Ile-Ife under both low-N (30 kg N/ha) and high-N (90 kg N/ha) levels. Under low-N conditions, grain yield improved from 2280 kg/ha during the first period to 2610 kg/ha during the third period, an increase of 165 kg/ha per period with r(2) of 0.99. Under high-N, yield increased from 3200 to 3650 kg/ha, an increase of 225 kg/ha and r(2) of 0.93. Relative gain per period was 30 kg/ha for the two N rates with r(2) values of 0.99 and 0.94 respectively. Grain yield performance of the 50 cultivars under low-N conditions adequately predicted their performance under high-N. Selection for Striga resistance and drought tolerance in early maturing maize populations enhanced low-N tolerance in the maize cultivars derived from the populations. The improvement was higher in later than earlier breeding periods.
相关主题: CULTIVARS, SECONDARY TRAITS, EXTRA-EARLY MAIZE, ENVIRONMENTS, WEST, AGRICULTURE, MULTIDISCIPLINARY, IMPROVEMENT, AGRONOMIC PERFORMANCE, SELECTION, DIFFERENT ERAS, HYBRIDS, Corn, Selective breeding, Plant resistance, Plant tolerance, Cultivars,

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