Registration of Tx807

Betrán, F. J.; Bockholt, A. J.; Fojt, F.; Odvody, G. N.

doi:10.2135/cropsci2003.1892

Cited by 5 publications

(4 citation statements)

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“…To our knowledge, only Crow's Hybrid Seed Company has continuously conducted a breeding program to improve high‐lysine maize. Texas A&M University has also maintained a breeding program to develop QPM inbreds and hybrids with normal seed appearance, competitive yield, and adaptation to the southern USA (Betrán et al, 2003a, 2003b, 2003c).…”

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confidence: 99%

Combining Abilities of Quality Protein Maize Inbreds

2004

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content in maize alone can add an estimated annual gross value of $360 million per year and can go up to Development and adoption of quality protein maize (Zea mays $480 million per year if protein also is increased (John-L.) (QPM) would increase the nutritional value of food and feed son et al., 2001). maize products. Breeding programs at the International Center for The CIMMYT has developed QPM that has im-Maize and Wheat Improvement, Mexico (CIMMYT); Texas A&M University (TAMU); and University of Natal, South Africa (SA) have proved kernel quality characteristics over o 2 /o 2 soft gedeveloped high-lysine inbreds. Information about how elite QPM notypes, by introducing modifier genes and selecting for inbreds of different origins combine and perform in hybrids will facilia hard, vitreous endosperm in o 2 /o 2 germplasm (Vasal, tate the selection of parents and breeding strategies for hybrid devel-2001). The CIMMYT QPM populations, pools, inbreds, opment. Our objectives were to estimate the general (GCA) and and hybrids adapted to subtropical and tropical environspecific combining abilities (SCA) for grain yield and secondary traits ments are widely used in the development of high-lysine among high-lysine inbreds from different sources and to identify pomaize in Brazil, China, Ghana, India, and several Latin tential heterotic relationships among them. Seven white (CML176, American countries (Vasal, 2001). The maize breeding CML181, CML184, Bo59W, Tx807, Tx811, and TxX124) and nineprogram at SA has developed high-lysine white (e.g., yellow QPM inbreds (CML190, CML193, Tx802, Tx814, Tx818, Bo46W and Bo59W) and yellow inbreds (e.g., Do940yMaize Breeding and Genetics Program, Soil and Crop Sciences Dep., Texas A&M Univ., College Station, TX 77843-2474. Received 12 Nov.

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confidence: 99%

Combining Abilities of Quality Protein Maize Inbreds

2004

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“…The maize inbred lines used in the study are listed in Table 1. The lines K1 and K2 are rich in lysine (QPM) due to the opaque-2 mutation (Betran et al, 2003a;Betran et al, 2003b). The lines M1, M2 and M3 are high methionine versions of A632, B73 and Mo17, respectively, and they reportedly contain 12.5%, 25% and 50% more methionine than their wild-type counterparts (Philips et al, 2008).…”

Section: Germplasmmentioning

confidence: 99%

Interaction of Dzr1, Opaque-2 and Normal Endosperm Maize Inbred Lines for Grain Yield and Protein Quality

Erdal¹,

Öztürk²,

Cengiz³

et al. 2021

Turkish Journal of Field Crops

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The objectives of this study were to (i) investigate genetic relationships among high lysine (HK) (opaque-2), high methionine (HM) (dzr1) and high yielding maize inbred lines (ii) to evaluate grain yield and protein quality of hybrids produced from these germplasm groups. Fifty-six hybrids generated from an 8 × 8 full diallel mating design were tested at two locations in Turkey in 2017 and 2018. Significant reciprocal effects for lysine, methionine, lysine quality index and methionine quality index revealed that parent effects may not be ignored in breeding for these traits. Lower grain yield among crosses produced from non-normal endosperm suggested that for high yield and improved amino acid concentration at least one parent of HK or HM should be used in hybrid combinations. HM × HM hybrids were not only good for high methionine, but also high lysine and protein. Several of the experimental hybrids in this study outperformed the commercial checks in terms of lysine and methionine yield. M2 × S1 hybrid had 27 % more lysine (58.6 kg ha -1 ) and 26 % more methionine (42.5 kg ha -1 ) yield than commercial high yielding normal hybrids. This study revealed that HK and HM germplasm can be combined with adapted high yield maize inbred lines to develop high yielding, high methionine and high lysine hybrids.

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“…Dagne [28] reported a higher contribution of an additive effect than a non-additive. Betran et al [29] found negative SCA for hybrids involving inbred lines with the same germplasm origin or related by pedigree and greater SCA for hybrids involving inbred lines of different source germplasm origin. Birhanu [26] and Abiy [30] reported that although both additive and non-additive genetic effects influence grain yield in inbred line crosses, the higher genetic variance is attributed to the additive genetic component.…”

Section: Introductionmentioning

confidence: 99%

Estimation of General and Specific Combining Ability Effects for Quality Protein Maize Inbred Lines

Mekasha

Chere

Ali

et al. 2022

IJPSS

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Background: Maize (Zea mays L.) plays a critical role in meeting high food demand. It is globally one of the most widely adapted and cultivated crops. Hybrid development from fixed inbred lines is one of the strategies for the improvement of maize production. The national average maize yield in Ethiopia is low and thus, selection of promising germplasm and knowledge of combining ability are prerequisites to developing high yielding maize varieties. Forty-two Quality Protein Maize (QPM) crosses (21 inbred lines each crossed with two testers) along with three popular standard hybrids were evaluated in two replications using alpha lattice during the 2017 cropping season at Ambo, Arsi-Negele, and Kulumsa. The objectives of this study were to identify lines with high GCA and estimate the SCA of crosses for grain yield, and other agronomic and morphological characters. Results: Significant difference among crosses was observed for 19 traits at Ambo, 14 traits at Arsi-Negele, and 19 traits at Kulumsa in the hybrid trial. Regarding the GCA effect, L8 had a significant difference to the positive side with the highest magnitude of GCA effect at three locations (3.40, 2.03, and 1.88 GCA effect values at Arsi-Negele, Ambo, and Kulumsa, respectively) which is followed by L7 for GY. All crosses did not show a significant SCA effect for GY in both directions at Ambo and Arsi-Negele but at Kulumsa, five crosses: L2xT1(1.89), L13xT2(1.88), L7xT1(1.86), L4xT2(1.49) and L19xT1(1.41) showed significant difference. In the combined analysis for six traits, Additive gene action was more important which was manifested by a higher sum square contribution of DS (79.6) EPP (79.3%), EL (80.0%), KPR (80.1%), ED (78.5%) and TSW (79.1%). Conclusion: Based on mean grain yield, and combining ability, L8xT2, L7xT1, L8xT1, L19xT1, L6xT2, and L18xT1 are promising crosses that could be forwarded for further use in maize breeding programs for further works.

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Registration of Tx807

Cited by 5 publications

References 1 publication

Combining Abilities of Quality Protein Maize Inbreds

Combining Abilities of Quality Protein Maize Inbreds

Interaction of Dzr1, Opaque-2 and Normal Endosperm Maize Inbred Lines for Grain Yield and Protein Quality

Estimation of General and Specific Combining Ability Effects for Quality Protein Maize Inbred Lines

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