Combining Ability of Traits Related to Nitrogen Use Efficiency in Eighteen Maize Inbred Lines

The objective of our study was to characterize and determine the patterns of genetic control in relation to tolerance and efficiency of nitrogen use by means of a complete diallel cross involving contrasting inbred progenies of tropical maize based on a univariate approach within the perspective of a multivariate mixed model. Eleven progenies, previously classified regarding the tolerance and responsiveness to nitrogen, were crossed in a complete diallel cross. Fifty-five hybrids were obtained. The hybrids and the progenies were evaluated at two different nitrogen levels, in two locations. The grain yield was measured as well as its yield components. The heritability values between the higher and lower nitrogen input environment did not differ among themselves. It was observed that the general combining ability values were similar for both approaches univariate and multivariate, when it was analyzed within each location and nitrogen level. The estimate of variance of the specific combining ability was higher than general combining ability estimate and the ratio between them was 0.54. The univariate and multivariate approaches are equivalent in experiments with good precision and high heritability. The nonadditive genetic effects exhibit greater quantities than the additive genetic effects for the genetic control of nitrogen use efficiency.

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Combining Ability for Nitrogen Use Efficiency in a Diallel Cross of Indian Rapeseed (Brassica rapa L.)

International Journal of Current Microbiology and Applied Sciences ◽

10.20546/ijcmas.2020.912.207 ◽

2020 ◽

Vol 9 (12) ◽

pp. 1746-1760

Author(s):

Priyakshee Borpatra Gohain ◽

Smrita Gogoi ◽

Kaushik Das ◽

Purna K. Barua

Keyword(s):

Brassica Rapa ◽

Nitrogen Use Efficiency ◽

Combining Ability ◽

Diallel Cross ◽

Nitrogen Use ◽

Use Efficiency

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Morpho-physiological combining ability among tropical and temperate maize germplasm for drought tolerance

Genetika ◽

10.2298/gensr1603053e ◽

2016 ◽

Vol 48 (3) ◽

pp. 1053-1066

Author(s):

Sekip Erdal ◽

Mehmet Pamukcu ◽

Ahmet Ozturk ◽

Koksal Aydinsakir ◽

Yilmaz Dogu

Keyword(s):

Water Use Efficiency ◽

Water Use ◽

Combining Ability ◽

Resistance Index ◽

Inbred Lines ◽

Tolerance Index ◽

Drought Tolerant ◽

Maize Inbred Lines ◽

Diallel Mating Design ◽

Use Efficiency

In this study, seven maize inbred lines representing different tropical, drought tolerant populations and two adapted temperate maize inbred lines were crossed in a half-diallel mating design to determine combining abilities. The genotypes were tested in well-watered (WW) and managed water stressed (WS) conditions in 2013 and 2014. General combining ability (GCA) and specific combining ability (SCA) mean squares were significant for all investigated traits and demonstrated both additive and non-additive genetic effects in both conditions. Higher desired leaf rolling, leaf senescence, stomatal conductance and leaf chlorophyll content GCA effects of tropical inbreds under WS conditions showed the presence of the valuable allels related to drought stress. SCA analysis revealed that the best hybrids for water use efficiency and irrigation water use efficiency were tropical x temperate crosses. Stress tolerance index and drought resistance index identified G5 x G9, a tropical x temperate hybrid, as the most tolerant hybrid to drought. Our study suggests that tropical drought tolerant germplasm has the potential to contribute useful genetic diversity to temperate maize breeding programs.

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