Heterosis and combining ability for yield and other agronomic traits in Triticale

Open Agriculture

Ferrari Enzo¹  Paccapelo Héctor¹  Domínguez Rodolfo¹  Picca Aurora¹ 

[1] Faculty of Agronomy, National University of La Pampa, RN 35 km 334 (CP 6300), Santa Rosa, La Pampa, Argentina;

关键词: triticale;    general combining ability;    specific combining ability;    additive genetic effects;    heterobeltiosis;   

DOI  :  10.1515/opag-2018-0005

来源: DOAJ

【 摘 要 】

The estimation of genetic parameters such as heterosis (Mh), heterobeltiosis (Hh), general combining ability (GCA) and specific combining ability (SCA) allows inferences about the predominant action of the genes, indicates the appropriate selection strategy, and facilitates identification of the best parents. The present study was carried out using a diallel cross system among five genotypes of Triticale (x Triticosecale Wittmak). Genotypes CIMMYT 829 (G1), CIMMYT 830 (G2), CIMMYT 834 (G3), CIMMYT 820 (G4) and Antonio UNLPam (G5) were crossed in a complete diallel combination without reciprocal crosses, in La Pampa, Argentina. The additive genetic effects were of greater importance than the nonadditive ones for the following traits: spike length (SL), days to anthesis (AD), spikelets per spike (SS); grains per spike (GS), 1000-kernel weight (1000-KW), grain yield (GY), test weight (TW) and harvest index (HI). The G1 and G4 parents showed better GCA for GY, HI, 1000-KW and SL indicating a greater contribution of additive gene action and a promising feature to obtain prominent recombination lines. The G1xG4 cross showed Hh and a significant SCA value for GY, indicating a greater contribution of the non-additive gene action, useful to develop hybrids.

【 授权许可】

Unknown