Breeding Early and Extra‐Early Maize for Resistance to Biotic and Abiotic Stresses in Sub‐Saharan Africa

Badu‐Apraku, B.; Fakorede, M. A. B.

doi:10.1002/9781118497869.ch3

Cited by 9 publications

(6 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…From the regression analysis, it was easy to identify the superior period 3 hybrids under drought, rainfed, and across environments compared to those of period 1 and 2. These results, therefore, justified the efforts and resources expended by the IITA-MIP to increase the genetic gains from selection among the extra-early maturing maize in SSA [29,30].…”

Section: Discussionmentioning

confidence: 66%

“…The 60 extra-early maturing hybrids (involving single-crosses, 3-way crosses, top crosses and double-crosses) were generated during three breeding periods in the IITA-MIP from 2008 to 2010 (period 1), 2011 to 2013 (period 2), and 2014 to 2016 (period 3) respectively (Table 1). In each period, an in-depth description of the strategies adopted for developing the hybrids has been reported [3,30]. [31] to improve extra-early maize for Striga resistance and drought tolerance.…”

Section: Background Of the Drought-tolerant Extra-early Hybridsmentioning

confidence: 99%

See 1 more Smart Citation

Genetic Gains from Selection for Drought Tolerance during Three Breeding Periods in Extra-Early Maturing Maize Hybrids under Drought and Rainfed Environments

et al. 2021

View full text Add to dashboard Cite

Genetic gain studies in a breeding program are very important for measuring the efficiency of the program over a specific period. It also provides breeders with an understanding of the outcomes of the huge investments committed to the breeding programs. This study sought to (i) estimate the gains in grain yield under drought and rainfed conditions and (ii) identify high-yielding and stable hybrids developed in the last two decades under drought and rainfed conditions. Sixty extra-early maturing hybrids developed by the International Institute of Tropical Agriculture (IITA), Ibadan, during three breeding periods: (2008–2010, 2011–2013, and 2014–2016) were assessed under managed drought and rainfed conditions across 14 environments in Nigeria to estimate the genetic gains in grain yield using linear regression analysis. Considerably high genetic gains (4.1%) per year for grain yield was obtained for the extra-early maturing hybrids under drought environments. Six of the top ten hybrids identified were from period 3, an indication of the high genetic gains from selection in period 3. Additionally, two of the top six period 3 hybrids (TZEEI 29 × TZEEI 13) × TZEEI 64 and TZdEEI 64 × TZEEI 54 were found to be the best yielding and most stable across the 14 test environments and were highly recommended for extensive evaluations to warrant their commercialization in sub-Saharan Africa (SSA).

show abstract

Section: Discussionmentioning

confidence: 66%

Section: Background Of the Drought-tolerant Extra-early Hybridsmentioning

confidence: 99%

Genetic Gains from Selection for Drought Tolerance during Three Breeding Periods in Extra-Early Maturing Maize Hybrids under Drought and Rainfed Environments

et al. 2021

View full text Add to dashboard Cite

show abstract

“…While increasing maize yields in farmers’ fields in SSA is unlikely to be achieved with a single intervention, the development of drought‐tolerant maize varieties will be an important component of the solution. Therefore, breeding for increased drought tolerance in maize has been the focus of intense research for over 30 yr in SSA (Fischer et al, 1982; Bänziger and Diallo, 2004; Bänziger et al, 2006; Cairns et al, 2012; Badu‐Apraku and Fakorede, 2013).…”

mentioning

confidence: 99%

Gains in Maize Genetic Improvement in Eastern and Southern Africa: II. CIMMYT Open‐Pollinated Variety Breeding Pipeline

Masuka¹,

Magorokosho²,

Olsen

et al. 2017

Crop Science

View full text Add to dashboard Cite

Open‐pollinated varieties (OPVs) still represent a significant proportion of the maize (Zea mays L.) seed system in many countries of sub‐Saharan Africa. The International Maize and Wheat Improvement Centre (CIMMYT) has been breeding improved maize varieties for the stress‐prone environments experienced by most smallholder farmers in eastern and southern Africa for over 30 yr. Hybrid breeding is now the major focus of the CIMMYT breeding pipeline. However, OPVs are generated within the hybrid pipeline. This is the first study to document genetic gain for maize grain yield under both optimal and stress (random and managed drought, low nitrogen [N], and maize streak virus [MSV]) conditions within the CIMMYT eastern and southern African OPV breeding pipeline. Genetic gain was estimated using the slope of the regression on the year of OPV release in regional trials over a 12‐yr period (1999–2011). Open‐pollinated varieties were separated into two maturity groups, early (<70 d to anthesis) and intermediate‐late (>70 d to anthesis). Genetic gain in the early maturity group under optimal conditions, random drought, low N, and MSV was 109.9, 29.2, 84.8, and 192.9 kg ha−1 yr−1. In the intermediate‐late maturity group, genetic gain under optimal conditions, random drought, low N, and MSV was 79.1, 42.3, 53.0 and 108.7 kg ha−1 yr−1. No significant yield gains were made under managed drought stress for both maturity groups. Our results show continued improvement in OPVs for both yield potential and stress tolerance.

show abstract

“…These areas are known for environmental factors (e.g., temperature and precipitation) that limit crop growth and have a mean FMHA of 0.7% according to SAGE data. These areas can be understandably regarded as unsuitable for maize cultivation, although measures such as irrigation and stress-tolerant cultivars may have played a role in overcoming environmental constraints and making maize cultivation possible [60][61][62]. On the other hand, maize was never grown on 28.77% of the sites predicted suitable for its cultivation, probably because of such factors as local land use forms and choice of the crop.…”

Section: Accuracy Of Evaluation Of Land Suitability For Maize Cultivationmentioning

confidence: 99%

Predicting Shifts in Land Suitability for Maize Cultivation Worldwide Due to Climate Change: A Modeling Approach

Gao

Zhang

Yue

et al. 2021

Land

View full text Add to dashboard Cite

Suitable land is an important prerequisite for crop cultivation and, given the prospect of climate change, it is essential to assess such suitability to minimize crop production risks and to ensure food security. Although a variety of methods to assess the suitability are available, a comprehensive, objective, and large-scale screening of environmental variables that influence the results—and therefore their accuracy—of these methods has rarely been explored. An approach to the selection of such variables is proposed and the criteria established for large-scale assessment of land, based on big data, for its suitability to maize (Zea mays L.) cultivation as a case study. The predicted suitability matched the past distribution of maize with an overall accuracy of 79% and a Kappa coefficient of 0.72. The land suitability for maize is likely to decrease markedly at low latitudes and even at mid latitudes. The total area suitable for maize globally and in most major maize-producing countries will decrease, the decrease being particularly steep in those regions optimally suited for maize at present. Compared with earlier research, the method proposed in the present paper is simple yet objective, comprehensive, and reliable for large-scale assessment. The findings of the study highlight the necessity of adopting relevant strategies to cope with the adverse impacts of climate change.

show abstract

Breeding Early and Extra‐Early Maize for Resistance to Biotic and Abiotic Stresses in Sub‐Saharan Africa

Cited by 9 publications

References 51 publications

Genetic Gains from Selection for Drought Tolerance during Three Breeding Periods in Extra-Early Maturing Maize Hybrids under Drought and Rainfed Environments

Genetic Gains from Selection for Drought Tolerance during Three Breeding Periods in Extra-Early Maturing Maize Hybrids under Drought and Rainfed Environments

Gains in Maize Genetic Improvement in Eastern and Southern Africa: II. CIMMYT Open‐Pollinated Variety Breeding Pipeline

Predicting Shifts in Land Suitability for Maize Cultivation Worldwide Due to Climate Change: A Modeling Approach

Contact Info

Product

Resources

About