Genetic analysis for heterotic traits in bread wheat (Triticum aestivum L.) using six parameters model

Genetic Analysis of Some Agronomic Traits in Two Bread Wheat Crosses under Heat Stress Conditions.

“…As well as in cross 2 for 100-grain weight under normal and heat stress conditions, indicating their reducing effect in the expression of these traits and there is no breeding importance in proceeding generations. These results are in agreement with those reported by Akhtar andChowdhry (2006), El-Aref et al (2011), Koumber and El-Gammaal (2012), Amin (2013), Hamam (2014) and Kumar et al (2017).…”

“…Additive × additive gene effects (i) were positive and significant or highly significant (Table 5) for days to heading in cross 1 under two environments, number of grains/spike in cross 1 under heat stress and 100grain weight in cross 2 under both environments, suggested that these traits have increasing genes and selection for its improvement could be effective. These results are in accordance with the findings of Moussa (2010), El-Aref et al (2011), koumber and El-Gammaal (2012), Hamam (2014) and Kumar et al (2017). However, negative and significant or highly significant values of additive × additive gene effects were reported for plant height in cross 2 under both treatments, number of spikes/plant in cross 1 and 2 under heat stress, number of grains/spike in cross 2 under normal sown, biological yield/plant in cross 1 under heat stress and in cross 2 under both environments and grain yield/plant in cross 2 under heat stress.…”

“…Also, selecting desirable characters may be practiced in the early generations but it would be effective in the late ones when dominant effect diminished. These results are in accordance with those obtained by El-Aref et al (2011), Zaazaa et al (2012), Abd El Rahman (2013), Amin (2013), Bilgin (2014), Hamam (2014), El-Hawary (2016) and Kumar et al (2017). Table 3.…”

“…However, average value of B C1 and B C2 progenies of the two crosses varied under normal and late sown conditions and each tended toward the mean of its recurrent parent. Similar results were reported by Amin (2013), Hamam (2014), Said (2014) and Kumar et al (2017).…”

“…These results are in agreement with those obtained by El-Aref et al (2011), Amin (2013), Hamam (2014) and El-Hawary (2016). Kumar et al (2017) reported that the additive gene effects were significantly negative for 1000-grain weight.…”