Effects of Salinity on Performance, Heritability, Selection Gain and Correlations in Wheat (Triticum aestivum L.) Doubled Haploids
Journal Title: Scientia Agriculturae - Year 2015, Vol 10, Issue 2
Abstract
Populations of doubled haploids (DH) derived from wheat (Triticum aestivum L.) crosses include sufficient amount of new genetic variation. Information on heritability and expected selection gain from such DH populations are necessary for plant breeders. The objectives of the present study were: (i) to describe the effects of elevated salinity level on agronomic and yield traits of new 117 DH lines derived from a cross between the Egyptian salt tolerant cultivar Sakha-8 and a promising high yielding line (L-25) and (ii) to study the response of heritability (h2b ) and genetic advance from selection (GA) to the elevated level of salinity. A factorial experiment with four salinity concentrations, i.e. 0, 3000, 6000 and 9000 ppm NaCl was used. The experiment was carried out in pots in 2012/2013 and 2013/2014 seasons and a combined analysis of variance across seasons was performed. Increasing NaCl salinity level from 0 to 9000 ppm caused a significant reduction in the means of straw yield/plant (80.6%), number of spikes /plant; NSPP (75.8%), number of tillers /plant; NTPP (75.1%), biological yield/plant (78.3%), number of grains/spike (66.4%), 1000-grain weight (66.1%), plant height (69.8%) and grain yield/plant; GYPP (60.5%), but caused a significant increase in harvest index (93.3%), days to heading (15.9%) and days to maturity (14.7%), i.e. lateness. It is observed that broad-sense heritability decreased as salinity increased more than 3000 ppm, i.e. to 6000 and 9000 ppm NaCl. The quadratic regression relationship between PCV, GCV, GA or h2b, for GYPP of wheat DH lines and elevated salinity level was sigmoid, indicating that to select salt tolerant genotypes, the optimum environment to gain the highest genetic advance is that irrigated with a salt solution of 7000 ppm NaCl concentration. The traits showing high heritability coupled with high expected genetic advance from selection as well as having a strong association with salinity tolerance (>0.78 under 9000 ppm NaCl) in the present experiment are GYPP, NTPP and NSPP. These traits are recommended as selection criteria for salinity tolerance.
Authors and Affiliations
A. M. M Al-Naggar, S. R. S Sabry, M. M. M Atta, Ola M Abd El-Aleem
Keywords
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- EP ID EP95064
- DOI 10.15192/PSCP.SA.2015.10.2.7083
- Views 160
- Downloads 0
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