The Inheritance of Yield and Yield Components of Five Wheat Hybrid Populations Under Drought Conditions

Abstract

The magnitude of genetic inheritance and expected genetic advance are important for the prediction of response to selection in diverse environments and provide the basis for planning and evaluating breeding programs. This work investigated the inheritance of traits related to drought in wheat under natural drought conditions. Cross combinations were made to produce F 1 and F 2 hybrid populations, which were evaluated in a randomized completed block design with three replications at University of Agriculture, Faisalabad, Pakistan. Six wheat varieties/lines and six derived F 2 hybrids were studied to ascertain heritability and genetic advance for plant height, days taken to maturity, number of tillers per plant, spike length, number of grains per spike, 1000-grain weight, and grain yield per plant. Data were collected and subjected to statistical genetic analyses. Heritability estimates and expected genetic advance for plant height, days taken to maturity, number of tillers per plant, 1000-grain weight and grain yield per plant were high for the entire cross combinations while the estimates for spike length and number of grains per spike were relatively low. Our results suggest that improvement for these characters should be faster because of higher heritabilities and greater phenotypic variation. Prospects of genetic improvement for all the characters studied are evident. The most promising cross combinations were WL60 × LU26S and WL61 × LU26S. These traits, therefore, deserve better attention in future breeding programs for evolving better wheat for stress environments.

Genetic potential and heritability estimates of yield traits in F3 segregating populations of bread wheat

“…Using 20% selection intensity, the expected genetic advance for spike length was 0.48 (Table 2). The present findings are in close conformity with the research work of Ahmad et al, (2007) who also observed low magnitude of heritability for spike length. On the other hand, Memon et al, (2007), Ullah et al, (2007), Laghari et al, (2010), Eid (2009), andAjmal et al, (2009), reported high heritability for spike length.…”

“…Mean 1000 grain weight data for the 24 wheat genotypes ranged from 32.8 g for Ghaznavi-98 x AUP-4006 to 47.3 g for Ghaznavi-98 x Pirsabak-05 with the mean value of 41.1 g (Table 3). Our findings are in close agreement with those of Ahmad et al, (2007), and Tahir et al, (2009), who also reported significant variation for 1000-grain weight among wheat genotypes.…”

“…These results are supported by Afridi and Khalil (2007), Ahmad et al, (2007), Ajmal et al, (2009), Khan et al, (2011), who also reported significant variation for grain yield of different genotypes. Genetic and environmental variances, broad-sense heritability and expected genetic advance for grain yield are given in Table 2.…”

Studies of phenotypic and genotypic variation in sixteen cucumber genotypes

“…Determining variability in yield and yield components of different cucumber genotypes will enable a breeder to know to what extent the environment affects yield (Ahmed and Khaliq, 2007;Ullah et al, 2012). Direct selection only for higher yield could be misleading because many factors interact to determine crop yield (Gatti et al, 2005).…”

Heritability Analysis for Yield Associated Traits in Wheat (Triticum aestivum L.)

“…Similarly Awaad (1996) reported high heritability for grain yield and 1000 grain weight. High genetic parameters for yield associated traits such as for plant height, tillers per plant, grains per plant, 1000-grain weight by Ahmed et al (2007). High heritability coupled with high genetic advance for plant height, peduncle length, days to heading and grain yield was reported by Ijaz et al (2013).…”