Heterosis and Combining Ability among Subtropical and Temperate Intermediate‐Maturity Maize Germplasm

Beck, David L.; Vasal, S. K.; Crossa, J.

doi:10.2135/cropsci1991.0011183x002600010017x

Cited by 63 publications

(63 citation statements)

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“…Information on the heterotic patterns and combing ability among maize germplasm is essential in maximizing the effectiveness of hybrid development (Beck et al, 1990). The phenomenon of heterosis has been exploited extensively in crop breeding, leading to significant increase in yield.…”

Section: Introductionmentioning

confidence: 99%

Combining ability and heterosis on yield and its component traits in maize (Zea mays L.)

Talukder

Karim

Ahmed

et al. 2016

Bangladesh J. Agric. Res

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Combining ability and heterosis were studied in a 7×7 half diallel cross in maize for grain yield and yield contributing characters. Significant general and specific combining ability variances were observed for all the characters studied. The significant estimates of GCA and SCA variances suggested the importance of both additive and non-additive gene actions for the expression studied traits. In these studies, variances due to SCA were higher than GCA for all charactesr, which revealed the predominance of non additive gene action (dominance and epistasis) for controlling these traits. Parents P 1 and P 4 were excellent general combiner for days to tasseling and silking while P 1 and P 5 for early maturity. P 4 for short height and, P 4 and P 7 for higher thousand kernel weight. The parents P 4 and P 6 having good combining abilities for yield. Heterosis estimation was carried out using two commercial varieties NK40 and 900MG. When standard commercial check NK40 was used, the percent heterosis for kernel yield varied from -51.39 to 12.53%. Among the 21 F 1 s, 3crosses exhibited significant positive heterosis for kernel yield. The highest heterosis was exhibited by the cross P 4 ×P 6 (12.43%), P 6 ×P 7 (10.89%) and P 2 ×P 3 (9.87%) respectively. Compared with 900MG as check, the percent heterosis for kernel yield varied from -53.73 to 7.01%. Among the 21 F 1 s, none of the crosses exhibited significant positive heterosis for kernel yield. The highest heterosis were exhibited by the crosses P 4 ×P 6 (7.01%), P 6 x P 7 (5.55%) and P 2 ×P 3 (4.57%). The crosses showed significant positive SCA values could be used for variety development after verifying them across the agro-ecological zones of Bangladesh.

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Section: Introductionmentioning

confidence: 99%

Combining ability and heterosis on yield and its component traits in maize (Zea mays L.)

Talukder

Karim

Ahmed

et al. 2016

Bangladesh J. Agric. Res

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“…Introgression of exotic germplasm is often suggested for increasing the genetic differences between opposite heterotic populations with an expected increase in heterotic response (Beck et al 1991;Vasal et al 1992a, b;Ron Parra and Hallauer 1997).…”

Section: Introductionmentioning

confidence: 99%

Use of SSRs for establishing heterotic groups in subtropical maize

et al. 2003

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Heterotic groups and patterns are of fundamental importance in hybrid breeding. The objectives of our research were to: (1) investigate the relationship of simple sequence repeats (SSR) based genetic distances between populations and panmictic midparent heterosis (PMPH) in a broad range of CIMMYT maize germplasm, (2) evaluate the usefulness of SSR markers for defining heterotic groups and patterns in subtropical germplasm, and (3) examine applications of SSR markers for broadening heterotic groups by systematic introgression of other germplasm. Published data of two diallels and one factorial evaluated for grain yield were re-analyzed to calculate the PMPH in population hybrids. Additionally, 20 pools and populations widely used in CIMMYT's breeding program were assayed with 83 SSR markers covering the entire maize genome. Correlations of squared modified Roger's distance (MRD(2)) and PMPH were mostly positive and significant, but adaption problems caused deviations in some cases. For intermediate- and early-maturity subtropical germplasm, two heterotic groups could be suggested consisting of a flint and dent composite. We concluded that the relationships between the populations obtained by SSR analyses are in excellent agreement with pedigree information. SSR markers are a valuable complementation to field trials for identifying heterotic groups and can be used to introgress exotic germplasm systematically.

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“…Introgression of exotic germplasm is often suggested for increasing the genetic differences between opposite heterotic populations with an expected increase in heterotic response (Beck et al, 1991;Vasal et al, 1992a, b;Ron Parra and Hallauer, 1997). …”

Section: Issn: 2319-7706 Volume 6 Number 6 (2017) Pp 61-73mentioning

confidence: 99%