Combining Ability and Heterosis for Agronomic and Yield Traits in Indica and Japonica Rice Crosses

Yuga, M. E.; Kimani, John; Kimani, Paul M.; Olubayo, M. F.; Muthomi, James W.; Nzuve, F. M.

doi:10.5539/jas.v10n12p92

Cited by 13 publications

(11 citation statements)

References 15 publications

(36 reference statements)

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“…Analysis of the hybrids revealed that no specific combination obtained significant positive SCA values for all of the estimated traits simultaneously. This result is in agreement with those from previous studies in rice 14 , 16 , 18 , 23 , 25 as well as in maize 26 , bread wheat 27 . However, the crosses H1 [significant ( P < 0.01 ) for yield traits] and H7 [significant ( P < 0.01 ) for grain Fe and Zn content] showed positive SCA values for all the traits in irrigated method.…”

Section: Discussionsupporting

confidence: 94%

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Grain Fe and Zn content, heterosis, combining ability and its association with grain yield in irrigated and aerobic rice

Anusha

Rao

Jaldhani

et al. 2021

Sci Rep

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Genetic improvement of rice for grain micronutrients, viz., iron (Fe) and zinc (Zn) content is one of the important breeding objectives, in addition to yield improvement under the irrigated and aerobic ecosystems. In view of developing genetic resources for aerobic conditions, line (L) × tester (T) analysis was conducted with four restorers, four CMS lines and 16 hybrids. Both hybrids and parental lines were evaluated in irrigated and aerobic field conditions for grain yield, grain Fe and Zn content. General Combining Ability (GCA) effects of parents and Specific Combining Ability (SCA) effects of hybrids were observed to be contrasting for the micronutrient content in both the growing environments. The grain Fe and Zn content for parental lines were negatively correlated with grain yield in both the contrasting growing conditions. However, hybrids exhibited positive correlation for grain Fe and Zn with grain yield under limited water conditions. The magnitude of SCA mean squares was much higher than GCA mean squares implying preponderance of dominance gene action and also role of complementary non-allelic gene(s) interaction of parents and suitability of hybrids to the aerobic system. The testers HHZ12-SAL8-Y1-SAL1 (T1) and HHZ17-Y16-Y3-Y2 (T2) were identified as good combiners for grain Zn content under irrigated and aerobic conditions respectively.

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Section: Discussionsupporting

confidence: 94%

“…For TGW trait, the hybrid H1 had highest significant positive SCA effect in both the cultivation methods, in spite of both parents were with negative GCA effect. These observations are similar to the previous studies 16 – 18 , 23 , 25 . Generally, the hybrids with high SCA effects are recommended for heterosis breeding.…”

Section: Discussionsupporting

confidence: 93%

Grain Fe and Zn content, heterosis, combining ability and its association with grain yield in irrigated and aerobic rice

Anusha

Rao

Jaldhani

et al. 2021

Sci Rep

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“…In the present study for determining the best combiner among the lines and testers, positive and significant values were considered for all the traits except DFF, PH and NUFGPP. was identified to be the best combiner among the testers.These observations are in accordance with reports of [3,68,69], wherein no single parent was identified to have a good GCA for all the traits in their studies. [2]demonstrated that the most promising and high yielding hybrids in their study were produced from two of the parents which showed the best GCA for grain yield.…”

Section: Discussionsupporting

confidence: 93%

“…In our study, in those cross combinations with higher and positive SCA values (due to high GCA values of parents), good combination of alleles from the parents might have resulted in positive SCA [2]. Also, those cross combinations that showed negative SCA effect value in our study, witnessed low to average GCA parental effects which is not in accordance with [68, 69]. The predicted genetic mechanisms of the SCA delineated in this study were in accordance with the report of [33].…”

Section: Discussioncontrasting

confidence: 60%

Assessment of heterotic potential and combining ability of immortal restorer lines derived from an elite rice hybrid, KRH-2, for the development of superior rice hybrids

Kulkarni

Fiyaz

et al. 2020

Preprint

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Present investigation was carried out to assess the heterotic potential and combining ability of immortal restorer lines [consisting of two recombinant inbred lines (RILs) and two doubled haploid lines (DHLs)] developed from an elite rice hybrid, KRH-2 by crossing them with three popular WA-CMS lines, IR58025A, CRMS32A and APMS6A through line × tester analysis. The doubled haploid line 1 (DHL-1) was observed to be a good general combiner for total grain yield per plant (YLD) and other yield component traits and among the CMS lines, IR58025A was observed to be the best combiner as it showed positive significant values for the traits viz., total grain yield per plant, panicle length and spikelet fertility. Higher preponderance of the variance associated with specific combining ability (SCA) as compared to general combining ability (GCA) variance was observed for most of the traits indicated the predominant role of non-additive gene action in the expression of the traits. Out of twelve novel crosses between the immortal restorer lines derived from KRH-2 and the WA-CMS lines, 66.66% (eight crosses) showed significant and desirable SCA effects for the traits viz., total grain yield per plant, days to fifty percent flowering, plant height, flag leaf length, flag leaf width, number of filled grains per panicle and spikelet fertility. Two crosses IR58025A/RIL-24 and CRMS32A/RIL-24 were observed to be the most promising cross combinations showing standard heterosis of >50% for YLD trait (as compared with KRH-2) with higher prevalence of GCA and SCA, respectively. Heterotic yield advantage of IR58025A/RIL-24 and CRMS32A/RIL-24 was 77.05% and 54.74%, respectively over KRH-2 and these can be utilized for developing commercial hybrids. The present study also indicates the potentiality of RILs in providing useful parental lines for developing heterotic hybrids which are hard to get from outside sources in the new intellectual property regime.

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“…the other hand, the restorer Giza-182 was recorded as the best combiner for CHLC, PL, FP, 1000-GW, NPP, GY, and AH; additionally, it was a good combiner for GT (Table 3). These findings were better compared to previous reports that showed no single parental line was found to be the best or a good combiner for all yieldrelated characters [27][28][29]. Therefore, these studied parental lines can be used to improve grain yield and its component traits in hybrid-rice-breeding programs.…”

Section: Mean Performance and Combining Abilitymentioning

confidence: 47%

Assessment of Genetic Parameters and Gene Action Associated with Heterosis for Enhancing Yield Characters in Novel Hybrid Rice Parental Lines

Gaballah

Attia

Ghoneim

et al. 2022

Plants

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The technology of hybrid rice utilizing heterosis is an essential requirement for achieving food security. The current study was aimed at assessing the genetic parameters and the gene actions of 15 yield-component traits associated with heterosis, in 9 new parental lines of hybrid rice and their generated hybrids. Five cytoplasmic male sterile (CMS) lines were crossed with four restorer (R) lines using twenty generated line × tester designation hybrid combinations. The results revealed that all the traits were controlled by additive and non-additive gene actions. However, the additive variance was the main component of the total genotypic variance. Assessment of the general combining ability (GCA) detected the best combiners among the genotypes. The hybrid combinations that expressed the highest-positive specific combining ability (SCA) for grain-yield were detected. The correlation between the GCA and SCA was evaluated. The hybrid crosses with high-positive heterosis, due to having a better parent for grain yield, were detected. The principal component analysis (PCA) recorded the first four principal axis displayed Eigenvalues >1 and existing variation cumulative of 83.92% in the genotypes for yield component characteristics. Three-dimensional plots corresponding to the studied traits illustrated that the genotypes Guang8A × Giza181, Quan-9311A × Giza179, II-32A × Giza181, and II-32A × Giza179 are classified as possessing superior grain yield.

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Combining Ability and Heterosis for Agronomic and Yield Traits in Indica and Japonica Rice Crosses

Cited by 13 publications

References 15 publications

Grain Fe and Zn content, heterosis, combining ability and its association with grain yield in irrigated and aerobic rice

Grain Fe and Zn content, heterosis, combining ability and its association with grain yield in irrigated and aerobic rice

Assessment of heterotic potential and combining ability of immortal restorer lines derived from an elite rice hybrid, KRH-2, for the development of superior rice hybrids

Assessment of Genetic Parameters and Gene Action Associated with Heterosis for Enhancing Yield Characters in Novel Hybrid Rice Parental Lines

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