Combining Ability for Yield and Other Agronomic Traits in Diallel Crosses of Six New Yellow Maize Inbred Lines

Abstract

A complete diallel cross among six new yellow maize inbred lines , i.e. 10RF , 11RF , 39RF, 45RF , 48RF and 50RF (Developed Improvement of Maize by Industrial Genotype Project) was made in 2010 summer season .Parental inbred lines and F1 crosses along with two yellow commercial check hybrids, SC155 and SC162 were evaluated in randomized complete block design with four replications at Gemmeiza in two different dates ; 15 April and 15 may 2011 summer season to study the combining ability in order to identify the most superior parental inbred lines that produce superior hybrids and develop high yielding new yellow single crosses. Results indicated that general combining ability (GCA) were highly significant for plant and ear heights , specific combining ability(SCA) were highly significant for grain yield (ardab / feddan) and a significant for days to 50 % silking .The non-additive genetic effects were more important and played the major role for all traits inheritance of. Generally most of F1 single crosses were earlier , shorter and had lower ear placement than two checks hybrids ; SC162 and SC155. All the F1 crosses were resistance to late wilt disease. All the F1 crosses out yielded significantly better than the check SC162 , except four crosses. Single crosses (P4×P1) was significantly better than the best check SC155 for grain yield ,shorter for plant height and earlier in days to 50%silking , however there were seven single crosses, i.e. (P5×P4), (P4×P2), (P1×P4) , (P1×P5), (P2×P3), (P6×P1) and (P2×P6)which statistically equal the check cross 155 and significantly earliness, shortens and lower placement ear; in addition those crosses yielded better than the best check hybrid insignificantly P1 (10 RF) was good combiner for resistance to late wilt disease and grain yield(ard/fed). However P4 (45 RF) was good combiner towards shortness, low ear placement and late wilt disease resistance. For (SCA) effects of the 15 F1 crosses had positive and highly significant effects. However for maternal effect or reciprocal (SCA) effects were found that single crosses i.e, (P5 × P4), (P3 × P6), (P4 × P2),(P5× P3),(P1 × P3) and (P6 × P1) yielded highly significant for grain yield of 32.7 , 31.83 , 32.52 , 30.93 , 30.42 and 31.28 (ard/fed) relative to its reciprocal parents , respectively. Therefore , these crosses may be released as new high yielding single crosses.

Combining ability for some inbred lines in half-diallel crosses of maize under two different locations conditions

“…1, 2, 5, 7, 9, 25 and 26 (P 1 x P 2 , P 1 x P 3 , P 1 x P 6 , P 1 x P 8 , P 2 x P 4 , P 5 x P 8 and P 6 x P 7 ) at combined data over both locations, exhibited desirable (s^ij) towards high grain yield, where they recorded significant or highly significant positive SCA effects for this trait. Similar results were reported by other authors such as, Sultan et al (2012 and, Attia et al (2013 and2015) and Abdel-Moneam et al (2014a, b, c).…”

“…303) showed significant or highly significant positive (g^i), as the combined data over two locations, indicating that these inbred lines could be considered as the best combiners for increasing grain yield. Similar results were reported by Soliman and Osman (2006), Sultan et al (2012 and, Attia et al (2013 and2015) and Abdel-Moneam et al (2014a, b, c).…”

“…168 (4.15 cm) in ear diameter, as combined data over the two studied locations, as shown in Table (3). Sultan et al (2012) came to similar results. For grain yield (ard/fad), the result in Table (3) revealed that the differences between crosses in this trait were highly significant and ranged from 19.78 ard/fed for cross No.…”

Combining Ability and Superiority for Yield and Some Related Traits in Half-Diallel Crosses of Nine New Yellow Maize Inbred Lines Under Two Locations

“…It is interest to note that the previous crosses shord at least one of good general combiner parent. Similar results were reported by other authors such as, Sultan et al (2012 and, Attia et al (2013 and2015) and Abdel-Moneam et al (2014,a, b and c).…”

“…508), P 7 (Gm.518) and P 8 (Gm. 520) at Gemmeiza location;three parental inbred lines namely : P 1 (Gm.500) and P 2 (Gm.505) and P 4 (Gm.508) at Sids location, and four parental inbred lines namely: P 2 (Gm.505), P 4 (Gm.508), P 7 (Gm.518) and P 8 (Gm.520)at combined data over both locations, showed positive significant or highly significant (g^i), indicating that these inbred lines could be considered as the best combiners for increasing grain yield, as reported by Soliman and Osman (2006), Sultan et al (2012 and, Attia et al (2013 and2015) and Abdel-Moneam et al (2014,a, b and c).…”