Growth and physiological responses of maize inbreds and their related hybrids under sufficient and deficient soil nitrogen
Ibraheem, F., El-Ghareeb, E. (2020). Growth and physiological responses of maize inbreds and their related hybrids under sufficient and deficient soil nitrogen. EKB Journal Management System, 22(1), 35-47. doi: 10.21608/cat.2020.122753
Farag Ibraheem; Eman El-Ghareeb. "Growth and physiological responses of maize inbreds and their related hybrids under sufficient and deficient soil nitrogen". EKB Journal Management System, 22, 1, 2020, 35-47. doi: 10.21608/cat.2020.122753
Ibraheem, F., El-Ghareeb, E. (2020). 'Growth and physiological responses of maize inbreds and their related hybrids under sufficient and deficient soil nitrogen', EKB Journal Management System, 22(1), pp. 35-47. doi: 10.21608/cat.2020.122753
Ibraheem, F., El-Ghareeb, E. Growth and physiological responses of maize inbreds and their related hybrids under sufficient and deficient soil nitrogen. EKB Journal Management System, 2020; 22(1): 35-47. doi: 10.21608/cat.2020.122753

Growth and physiological responses of maize inbreds and their related hybrids under sufficient and deficient soil nitrogen

Catrina: The International Journal of Environmental Sciences
Article 5, Volume 22, Issue 1, October 2020, Page 35-47  XML PDF (1.14 MB)
Document Type: Original Article
DOI: 10.21608/cat.2020.122753
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Authors
Farag Ibraheem email orcid 1, 2; Eman El-Ghareeb3
11Biology Department, AlQunfodah University College, Umm-Al Qura University, Saudi Arabia
22Botany Department, Faculty of Science, Mansoura University, Mansoura, Egypt, 35516;
32Botany Department, Faculty of Science, Mansoura University, Mansoura, Egypt, 35516
Abstract
In this study, the effects of sufficient and deficient soil N on the growth and physiology performance of maize inbreds (B73, Mo17, Sids7 and Sids63) and hybrids (B73 × Mo17 and Sids7 × Sids63) were simultaneously monitored. This was done at rapid growth phase to have better understanding of the inbred/hybrid growth and physiological relationships. B73 and Sids7 maintained superior growth over Mo17 and Sids63. Their superiority was associated with larger leaf area, lower SLA, high levels of photosynthetic pigment, sucrose, ammonia-N, amino-N, total N and NUE under both N treatments. Hybrids surpassed their parental inbreds in growth and leaf features under the same N rates. Sids7 × Sid63 had higher biomass and faster growth rate than B73 × Mo17 and its superiority was associated with higher leaf area, smaller SLA and greater leaf N. N limitation reduced growth and physiological components in all genotypes, although at significantly different magnitudes. In contrast, limited N induced different levels of starch accumulation in all genotypes indicating variable degrees of disruption of source-sink relationships. The improved growth of B73, Sids7 and the hybrids under sufficient and limited N supply is shaped by a combination of larger leaf area, smaller SLA, higher leaf N, efficient resource utilization, and maintaining proper source-sink relations.
 
Keywords
Keywords: maize; inbreds; hybrids; growth; physiology; nitrogen; carbohydrates
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