Combining ability and heterosis for some canola characteristics sown on recommended and late planting dates using biplot

Hassan AMIRI OGHAN,Naser SABAGHNIA,Bahram ALIZADEH,Majid GHOLAMHOSEINI,Amir Hossein SHIRANI RAD,Farnaz SHARIATI,James MILLNER

doi:10.14720/aas.2018.111.2.16

Hassan AMIRI OGHAN, Naser SABAGHNIA + Show 5 more

Open Access

https://doi.org/10.14720/aas.2018.111.2.16

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Abstract

Canola (Brassica napus L.) is one of the most efficient oil-producing crops in arid and semi-arid regions of the world. In the current study, ten winter canola genotypes [seven genotypes as lines (Zarfam (L1), Talaye (L2), SLM046 (L3), Geronimo (L4), Modena (L5), Opera (L6) and Symbol (L7)] and three genotypes as testers [Okapi (T1), Licord (T2) and Orient (T3)] and their F1 hybrids (21 hybrids) were evaluated to determine the genetic parameters for grain yield, oil content, meal and seed glucosinolate contents under two different planting date [recommended (late September) and late planting (late October)]. According to combined analysis of variance there were significant differences among the genotypes for most studied traits. The genotype main effect and genotype × environment interaction (GGE) biplot method was used for analyzing line × tester design data. Among the lines, L5 showed high negative general combining ability (GCA) effect for meal glucosinolate content in both conditions whereas L1, L5 and L6 revealed high negative GCA effects for seed glucosinolate content in both planting date. From the results, it could be concluded that, hybridization between T1×L1, T1×L6 or T3×L5 is an efficient approach to release genotypes with low seed and meal glucosinolate content. Furthermore, to develop canola cultivars with higher seed and oil yield, hybridization between T1×L7 or T2×L7 is highly recommended. Improved oil content will be achieved if T1×L5, T2×L5 or T3×L6 hybrids are implemented into the breeding programs.

Highlights

Canola (Brassica napus L.) is one of the most efficient oilproducing crops in arid and semi-arid regions of the world
Numerous researches have been performed on combining ability and heterosis, most of these researches have shown significant effects of GCA and SCA on grain yield and oil content in canola suggesting that both additive and non-additive gene action play a crucial role in inheritance of these traits (Schierholt et al, 2001; Amiri-Oghan et al, 2009; Qian et al, 2009)
It can be concluded that, to release low seed or meal glucosinolate genotypes, combinations of T1 × L1, T1 × L6 and T3 × L5 should be taken into account as preferential materials

Summary

Introduction

Canola (Brassica napus L.) is one of the most efficient oilproducing crops in arid and semi-arid regions of the world. In order to improve canola seed yield, it is essential to have certain information on the nature of both general and specific combining ability (GCA, SCA) of candidate parents, used in hybridization. Numerous researches have been performed on combining ability and heterosis, most of these researches have shown significant effects of GCA and SCA on grain yield and oil content in canola suggesting that both additive and non-additive gene action play a crucial role in inheritance of these traits (Schierholt et al, 2001; Amiri-Oghan et al, 2009; Qian et al, 2009)

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