Agronomic performance of maize (<i>Zea mays</i> L.) breeding lines derived from a low nitrogen maize population

Kamara, Alpha Y.; Kling, J. G.; Menkir, Abebe; Ibikunle, O.

doi:10.1017/s0021859603003514

Cited by 43 publications

(26 citation statements)

References 22 publications

(29 reference statements)

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“…In this study of principal component use to reduces of original variables into four principal component and information about each variable which support cluster analysis result. These findings were similar to the results founded by Syafii et al (2015) and Kamara et al (2003).In present finding multivariable analysis help to selection of inbred lines for heat stress tolerance breeding: similar to the results reported by Akte ret al, (2009).…”

Section: Discussionsupporting

confidence: 93%

Analysis of genetic diversity among the maize inbred lines (Zea mays L.) under heat stress condition

Kandel

Ghimire

Ojha

et al. 2018

J. Maize Res. & Dev.

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High temperature adversely affects the plant physiological processes: limits plant growth and reduction in grain yield. Heat stress is often encountered to spring sowing of maize in spring season. Twenty maize inbred lines were studied for days to 50 % anthesis and silking, anthesis-silking interval, leaf firing, tassel blast, SPAD reading and leaf senescence, plant and ear height, leaf area index, ear per plant, cob length and diameter, number of kernel/ear, number of kernel row/ear, number of kernel row, silk receptivity, shelling percentage, thousand kernel weight and grain yield in alpha lattice design at National Maize Research Program at Rampur, Chitwan,Nepal with the objective to identify superior heat stress tolerant lines. Analysis of variance showed significant difference for all the traits. Result of multivariable analysis revealed that twenty inbred lines formed four clusters. The resistance inbred lines and susceptible inbred lines formed different clusters. The members of cluster 4 were found to be tolerant to heat stress due to they had lowest value of tassel blast, leaf firing, and leaf area index with highest value of cob diameter and length, ear per plant, number of kernel row/ear, number of kernel/ear, number of kernel row, shelling percentage, silk receptivity and grain yield whereas as members of cluster 1were found most susceptible due to they had longer anthesis silking interval, with maximum tassel blast and leaf firing along with no grain yield under heat stress condition. From this study inbred lines RL-140, RML-76, RML-91 and RML-40 were found most tolerant to heat stress. These inbred lines belonging to superior cluster could be considered very useful in developing heat tolerant variety and other breeding activities.

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Section: Discussionsupporting

confidence: 93%

Analysis of genetic diversity among the maize inbred lines (Zea mays L.) under heat stress condition

Kandel

Ghimire

Ojha

et al. 2018

J. Maize Res. & Dev.

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“…The positive and significant correlations between the components of NUE and GY were similar to the results reported by Heuberger (1998) and Kamara et al (2003). Although the relationship between GY and NUPE at silking under high N was similar to that observed under low N, the stronger correlations of GY with NUPE at harvest under low N suggested that NUPE could play a relatively more important role in determining GY under low N supply Presterl et al 2002).…”

Section: Discussionsupporting

confidence: 88%

Genetic Variation for Nitrogen-Use Efficiency Among Selected Tropical Maize Hybrids Differing in Grain Yield Potential

Abe

Menkir

Moose

et al. 2013

Journal of Crop Improvement

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Low soil nitrogen (N) and sub-optimal N fertilizer applications result in poor grain yield (GY) in maize. Genotypes with improved N-use efficiency (NUE) are particularly beneficial to low-input agriculture. Information on the relative importance of the main components of NUE will facilitate genetic improvement of tropical maize for NUE. This study evaluated genetic variation for NUE among tropical maize hybrids selected for contrasting responses to N. The hybrids were grown in replicated trials from 2006 to 2008 where plots received either no (0 kg N/ha), low (30 kg N/ha), or high (90 kg N/ha) levels of supplemental N. The results documented significant genetic variation for GY and measured NUE component traits among the hybrids, as well as significant interactions between hybrid and N level for all traits except nitrogen harvest index. Under low N, NUE, NUPE, and NUTE increased by 61%, 21%, and 42%, respectively. Grain yield was significantly and positively correlated with NUE, NUPE, and NUTE at both low N and high N. Both NUPE and NUTE were significantly and positively correlated to NUE. Five hybrids (4001/4008,

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“…This might have caused slight change in rankings among the genotypes. Kamara et al (2003) reported genotype × year interaction for maize genotypes evaluated in the Guinea savannas of Nigeria due to slight changes in rankings of the genotypes between the years. The variation among the cowpea genotypes is represented by the mean values (Table 4).…”

Section: Results and Discussion Mean Agronomic Performance Of The Culmentioning

confidence: 99%

Agronomic evaluation of cowpea cultivars developed for the West African Savannas

Kamara

Ewansiha

Ajeigbe

et al. 2017

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The goal of this research was to evaluate diverse cowpea genotypes developed over the past 4 decades in the Nigerian Sudan Savannas for their agronomic performance and to identify groups of cultivars with similar quantitative characters. Characterization would facilitate the efficient synthesis of breeding populations for further improvement of cowpea. Also superior genotypes with desirable characteristics could be identified and disseminated in the dry savannas of West Africa. Significant variations were observed in the agronomic characteristics of the cultivars in this study. Principal component analysis (PCA) and cluster analysis were performed on these genotypes and found that there were significant correlations among the variables measured. Modern cultivars outperformed the older ones and from the results of PCA, it was found that the most important variables for the classification of cowpea cultivars are high canopy, high seed weight, high total dry matter, high HI, and high grain and fodder yield. This suggests that these traits could be used in selection index for genetic improvement of cowpea. Cluster analysis resulted in 5 groups mostly corresponding to era of release except cluster I which contained cowpea cultivars from all eras. Two distinct groups in clusters IV and V were identified. Cultivars in cluster IV which were released in the 1990-2000 eras, had high grain and fodder yield. These cultivars could be evaluated on-farm for eventual release to farmers. They could also be used in breeding program for improvements in grain and fodder yield of cowpea. Cluster V contained two cultivars that distinctly had the highest fodder yield suggesting that they could be used to improve fodder yield of cowpea.

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Agronomic performance of maize (Zea mays L.) breeding lines derived from a low nitrogen maize population

Cited by 43 publications

References 22 publications

Analysis of genetic diversity among the maize inbred lines (Zea mays L.) under heat stress condition

Analysis of genetic diversity among the maize inbred lines (Zea mays L.) under heat stress condition

Genetic Variation for Nitrogen-Use Efficiency Among Selected Tropical Maize Hybrids Differing in Grain Yield Potential

Agronomic evaluation of cowpea cultivars developed for the West African Savannas

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