HETEROSIS AND COMBINING ABILITY FOR QUALITY TRAITS IN
INTERVARIETAL AND INTERSPECIFIC HYBRIDS IN OATS
PRATIKSHA MISHRA, R. N. ARORA, U. N. JOSHI AND A. K. CHHABRA
Department of Genetics & Plant Breeding
CCS Haryana Agricultural University,
Hisar-125 004 (Haryana), India
*(e-mail : arora15@rediffmail.com)
(Received : 4 August 2014; Accepted : 18 September 2014)
SUMMARY
Heterosis and combining ability studies were performed on 7 x 7 half diallel of intra-and interspecific crosses involving six cultivars of Avena sativa and one accession of A. sterilis for crude protein, fat, total soluble sugars, reducing and non-reducing sugars in oat grain. The best crosses showing positive significant heterosis were identified as A. sativa cv. HJ 8 x A. sativa cv. UPO 212 and A. sativa cv. HJ 8 x A. sativa cv. OS 346 for protein content; A. sativa cv. HJ 8 x A. sterilis and A. sativa cv. HJ 8 x A. sativa cv. UPO 212 for fat content; A. sativa cv. HJ 8 x A. sativa cv. OS 6 for total soluble sugar; A. sativa cv. UPO 212 x A. sterilis and A. sativa cv. HJ 8 x A. sterilis for reducing sugar and A. sativa cv. HJ 8 x A. sativa cv. OS 6 for non-reducing sugars. Significant GCA effects revealed that parent A. sterilis for higher protein content; OS 6 (A. sativa) for higher fat; UPO 212 (A. sativa) for higher total soluble sugars while parent Kent (A. sativa) for high reducing sugar content whereas, parent OS 346 (A. sativa) for nonreducing sugar were identified as good general combiners. On the basis of significant SCA effects, hybrids Kent (A. sativa) x UPO 212 (A. sativa) and OS 6 (A. sativa) x OS 346 (A. sativa) for grain yield; HJ 8 (A. sativa) x OS 346 (A. sativa) and HJ 8 (A. sativa) x UPO 212 (A. sativa) for CP; HJ 8 (A. sativa) x A. sterilis and UPO 212 (A. sativa) x A. sterilis for high fat; HJ 8 (A. sativa) x OS 6 (A. sativa), HJ 8 (A. sativa) x UPO 212 (A. sativa) for total soluble sugars; HJ 8 (A. sativa) x A. sterilis, OL125 (A. sativa) x OS 346 (A. sativa) for reducing sugars and HJ 8 (A. sativa) x OS 6 (A. sativa) for non-reducing sugars were identified as best specific combiners.
Key words: Heterosis, combining ability, Avena sativa, A. sterilis, diallel