Generation mean analysis for nitrogen and phosphorus uptake, utilization, and translocation indexes at vegetative stage in tropical popcorn
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Understanding the genetic control of the nitrogen (N) and phosphorus (P) uptake, utilization, and translocation is essential to develop superior popcorn genotypes with high N and P use efficiency. The main objective of this study was to determine the genetic control for N and P uptake, utilization, and translocation efficiency indexes and shoot and root traits under low-N and -P conditions at early vegetative stage in tropical popcorn. We estimated linear and quadratic genetic components from replicated early evaluation (V6 stage) of six generations derived from two crosses involving contrasting inbred lines for N and P uptake and translocation efficiency indexes under low-N and -P conditions. In general, the linear non-additive components were greater than the additive component. Dominance effect was important for increasing N uptake and translocation, while for P uptake and translocation both dominance and epistatic genetic effects were important. For most of the shoot and root traits, dominance and epistatic effects were important as well. Excepting P uptake efficiency, the average degree of dominance indicated partial dominance for several of the measured traits. Efficient direct selection for early N efficiency can be achieved and also provides indirect gains in several shoot and root traits via N uptake. Concerning the early P efficiency, efficient selection can be achieved for P uptake via shoot dry weight and root surface area. Our results evidenced that reciprocal recurrent selection based on early evaluation of progeny might be useful to develop popcorn genotypes with superior N and P efficiency under low-nutrient conditions.
KeywordsAbiotic stress Genetic control Nitrogen and phosphorus uptake Root and shoot traits
We thank the National Council for Scientific and Technological Development (CNPq), the Brazilian Federal Agency for Support and Evaluation of Graduate Education (Capes), and the Foundation for Research Support of Minas Gerais State (Fapemig) for financial support.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
- Azizi F, Rezai AM, Saeidi G (2006) Generation mean analysis to estimate genetic parameters for different traits in two crosses of corn inbred lines at three planting densities. J Agric Sci Technol 8:153–169Google Scholar
- Chiangmai PN, Yodmingkhwan P, Nilprapruck P, Aekatasanawan C, Kanjanamaneesathian M (2013) Generation means analysis of phytic acid and inorganic phosphorus contents in corn (Zea mays L.). Maydica 58:243–253Google Scholar
- Du Q, Wang K, Xu C, Zou C, Xie C, Xu Y, Li W (2016) Strand-specific RNA-seq transcriptome analysis of genotypes with and without low-phosphorus tolerance provides novel insights into phosphorus-use efficiency in maize. BMC Plant Biol 16:222. https://doi.org/10.1186/s12870-016-0903-4 CrossRefPubMedPubMedCentralGoogle Scholar
- Hirel B, Le Gouis J, Ney B, Gallais A (2007) The challenge of improving nitrogen use efficiency in crop plants: towards a more central role for genetic variability and quantitative genetics within integrated approaches. J Exp Bot 58:2369–2387. https://doi.org/10.1093/jxb/erm097 CrossRefPubMedGoogle Scholar
- Moll RH, Kamprath EJ, Jackson WA (1982) Analysis and interpretation of factors which contribute to efficiency of nitrogen utilization. Agron J 74:562–564. https://doi.org/10.2134/agronj1982.00021962007400030037x CrossRefGoogle Scholar
- Mundim GB, Viana JMS, Maia C, DeLima RO, Almeida VC (2014) Early evaluation of popcorn hybrids for vegetative use efficiency of nitrogen and phosphorus and secondary traits. Maydica 59:321–328Google Scholar
- Mushongi AA, Derera J, Tongoona P, Lyimo NG (2012) Generation mean analysis of leaf chlorophyll concentration from mid-silking to physiological maturity in some tropical maize Zea mays L genotypes under low and high nitrogen dosages. Euphytica 189:111–122. https://doi.org/10.1007/s10681-012-0731-z CrossRefGoogle Scholar
- Parentoni SN Jr, de Souza CL, de Carvalho Alves VM, Gama EEG, Coelho AM, de Oliveira AC, Guimarães PEO, Guimarães CT, Vasconcelos MJV, Pacheco CAP, Meirelles WF, de Magalhães JV, Guimarães LJM, da Silva AR, Mendes FF, Schaffert RE (2010) Inheritance and breeding strategies for phosphorus efficiency in tropical maize (Zea Mays L.). Maydica 55:1–15Google Scholar
- Raikwar RS (2015) Generation mean analysis of grain yield and its related traits in barley (Hordeum vulgare L.). Electronic Journal of Plant Breeding 6:37–42Google Scholar
- SAS Institute (2007) The SAS system for Windows, version 9.2. SAS Institute Inc, CaryGoogle Scholar
- United States Department of Agriculture National Agricultural Statistics Service (2018) Field crops statistics, USDA-NASS. https://www.nass.usda.gov. Accessed 28 May 2018