EurekaMag.com logo
+ Site Statistics
References:
53,869,633
Abstracts:
29,686,251
+ Search Articles
+ Subscribe to Site Feeds
EurekaMag Most Shared ContentMost Shared
EurekaMag PDF Full Text ContentPDF Full Text
+ PDF Full Text
Request PDF Full TextRequest PDF Full Text
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter
Follow on LinkedInFollow on LinkedIn

+ Translate

Response of low-N pool maize population to nitrogen uptake and use efficiency after three cycles of full-sib recurrent selection



Response of low-N pool maize population to nitrogen uptake and use efficiency after three cycles of full-sib recurrent selection



Journal of agricultural science 145(5): 481-490



Identification of plant cultivars efficient for nitrogen (N) uptake and utilization may contribute to the improvement of crop yield potential in areas of low-N (LN) availability. Three cycles of full-sib recurrent selection were applied on a LN pool-yellow (LNP-Y) maize population to improve its level of tolerance to low soil N in the savannah ecosystem. The progress after three cycles of selection was evaluated for two years (2000 and 2001). The objectives of the study were to classify the cycles in relation to response to N levels under field conditions and to investigate the progress in selection for improved grain yield and other agronomic traits at two N levels, LN (30 kg N/ha) and high-N (HN, 90 kg N/ha). The experiment was conducted under field conditions at the LN screening site of the Institute for Agricultural Research, Samaru, in the northern Guinea savannah of Nigeria. The experimental design consisted of randomized complete blocks with three replications. The aboveground biomass and grain at harvest were analysed for total N content. The results indicated differences in plant population response to N levels. Mean grain yield ranged from 2p"5 t/ha in cycle 1 to 2p"7 t/ha in cycle 3 under LN and from 4p"2 t/ha in cycle 1 to 4p"3 t/ha in cycle 3 under HN. The observed gains were 4p"8% per cycle under LN and 1p"4% per cycle under HN. Nitrogen use efficiency (NUE) traits, viz. N uptake efficiency and N utilization efficiency were positively affected by selection. Gains for N utilization efficiency were 6p"3% per cycle at LN and 9p"1% per cycle at HN, while observed gains for NUE were 3p"9% at LN and 1p"4% per cycle at HN. However, N utilization efficiency was identified as the most important component of NUE for selecting cycles of selection in population development. Total N content and N utilization efficiency were significantly correlated with each other at LN, and had a significant, positive, direct effect on grain yield. Grain yield was positively correlated with N content and N utilization efficiency at both N levels. Also, a significant positive correlation was observed at LN between 300 kernel weight and N utilization efficiency. N utilization efficiency was correlated with ears/plant at HN and negatively correlated with anthesis-silking interval (ASI). The present study revealed that selection for improved productivity under LN stress conditions could be further enhanced by simultaneously selecting for high grain yield performance based on N utilization efficiency and on secondary traits, such as ears/plant, 300 kernel weight, and reduced ASI.

(PDF emailed within 0-6 h: $19.90)

Accession: 016924262

Download citation: RISBibTeXText

DOI: 10.1017/s0021859607007198



Related references

Genetic gains from cycles of full-sib recurrent selection for low nitrogen tolerance in a tropical maize population. MAYDICA 51(3-4): 497-505, 2006

Responses to four cycles of full-sib family recurrent selection in an F2 maize population. Maydica 38(1): 31-37, 1993

Direct and correlated responses after two cycles of full sib recurrent selection for machine harvestable grain yield in a maize population. Genetica Agraria 41(4): 443-452, 1987

Effects of 3 cycles of reciprocal recurrent selection on the nitrogen and plant population responses of 2 maize hybrids in kenya. Crop Science 18(1): 112-114, 1978

A multiplicative selection index applied to four cycles of full-sib recurrent selection in maize. Crop Science 22(5): 981-983, 1982

A multiplicative selection index applied to 4 cycles of full sib recurrent selection in maize zea mays. Crop Science 22(5): 981-983, 1982

Evaluation of three cycles of full-sib reciprocal recurrent selection in two maize populations from the Northeast of Spain. Euphytica 191(2): 301-310, 2013

Sixteen cycles of recurrent full-sib family selection for grain weight in two maize populations. Crop science 31(4): 959-964, 1991

Effect of mass selection and full-sib recurrent selection on the yield of Tainan-white maize population. Journal of the Agricultural Association of China 2(2): 130-139, April, 2001

Effects of recurrent selection for maize complex population - Jilin Pool 1. Scientia Agricultura Sinica 33(Suppl.): 87-92, 2000

Selection response and genetic variances in three replicates of reciprocal full-sib recurrent selection in maize (Zea mays L.). 1997

Inter- and intrapopulation genetic variances after ten cycles of reciprocal full-sib recurrent selection in the BS10 and BS11 synthetic maize populations. Maydica 44(1): 9-24, 1999

Recurrent selection for nitrogen-use efficiency in maize. Proceedings of the Tenth South African Maize Breeding Symposium, Potchefstroom, South Africa, 17-19 March 1992: 7-10, 1994

Study on half-sib and full-sib recurrent selection in maize population. Journal of Shenyang Agricultural University 20(4): 399-406, 1989

Observed response and genetic variability in two maize populations after four cycles of reciprocal full-sib selection. Dissertation Abstracts International, B 41(3): 765B-766B, 1980