Abstract
As an attempt to develop high-yielding and TYLCV-tolerant hybrids, this study was conducted using TYLCV-tolerant inbred lines F8: 802-5 (P1); F8: 802-21 (P2) and selection of CLN3498E (P3) and TYLCV-susceptible cvs Ace 55VF (P4), Super Strain B (P5) and Castlerock (P6). A line × tester mating system was carried out under greenhouse conditions through the 2012 winter planting to produce tolerant × susceptible hybrids. Nine F1 hybrids and their parents were evaluated for TYLCV tolerance, yield and fruit quality under natural infection of TYLCV by whitefly-mediated virus inoculations under field conditions during the 2013 and 2014 fall plantings. Mid-parent hterosis (H), heterobeltiosis (BPH), potence ratio (P), and combining ability effects were estimated for the evaluated traits. The variances due to combining abilities showed that additive gene action played the predominant role in controlling TYLCV-tolerance and yield traits. The hybrids of parent P1, in addition to P2 × P4 exhibited the maximum H and BPH for early (EY) and total yield (TY)/plant under TYLCV-infection. The hybrids of P1 were exhibited the maximum negative significant H of TYLCV mean score. TYLCV-tolerant parent P1 was a good combiner for TYLCV mean score, EY/plant and TY/plant traits, while, TYLCV-susceptible parent P4 was a good combiner for each of TYLCV-mean score, EY/plant, TY/plant, average fruit weight (AFW), and fruit TSS content traits. The TYLCV-tolerant cross P2 × P4 was a good combination for TYLCV mean score, TY/plant, AFW, fruit firmness, and fruit TSS content traits, while TYLCV-tolerant cross P1 × P4 was a good combination for TYLCV mean score, EY/plant, TY/plant and fruit titarable acidity content traits.
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Claims 7
Claim · model-written summary
Additive gene action predominated for TYLCV tolerance and yield traits.
- Outcome
- TYLCV-tolerance and yield traitse0
Not reportedTaxon
Verbatim
e0“additive gene action played the predominant role in controlling TYLCV-tolerance and yield traits.”
Claim · model-written summary
P1 hybrids and P2 × P4 had maximum heterosis for early and total yield under infection.
- Material
- P2 × P4e0
- Interactor
- TYLCVTomato yellow leaf curl viruse0pathogen
- Outcome
- H and BPH for early (EY) and total yield (TY)/plante0
- Direction
- maximume0
Not reportedTaxon
Verbatim
e0“The hybrids of parent P1, in addition to P2 × P4 exhibited the maximum H and BPH for early (EY) and total yield (TY)/plant under TYLCV-infection.”
Claim · model-written summary
P1 hybrids had maximum negative significant heterosis for TYLCV score.
- Material
- P1e0
- Interactor
- TYLCVTomato yellow leaf curl viruse0pathogen
- Outcome
- TYLCV mean scoree0
- Direction
- negativee0
Not reportedTaxon
Verbatim
e0“The hybrids of P1 were exhibited the maximum negative significant H of TYLCV mean score.”
Claim · model-written summary
P1 was a good combiner for TYLCV score, early yield and total yield.
- Material
- P1e0
- Interactor
- TYLCVTomato yellow leaf curl viruse0pathogen
- Outcome
- TYLCV mean score, EY/plant and TY/plant traitse0
Not reportedTaxon
Verbatim
e0“TYLCV-tolerant parent P1 was a good combiner for TYLCV mean score, EY/plant and TY/plant traits”
Claim · model-written summary
P4 was a good combiner for TYLCV score, yields, fruit weight and TSS.
- Material
- P4e0
- Interactor
- TYLCVTomato yellow leaf curl viruse0pathogen
- Outcome
- TYLCV-mean score, EY/plant, TY/plant, average fruit weight (AFW), and fruit TSS content traitse0
Not reportedTaxon
Verbatim
e0“TYLCV-susceptible parent P4 was a good combiner for each of TYLCV-mean score, EY/plant, TY/plant, average fruit weight (AFW), and fruit TSS content traits.”
Claim · model-written summary
P2 × P4 combined TYLCV score, total yield, fruit weight, firmness and TSS.
- Material
- P2 × P4e0
- Interactor
- TYLCVTomato yellow leaf curl viruse0pathogen
- Outcome
- TYLCV mean score, TY/plant, AFW, fruit firmness, and fruit TSS content traitse0
Not reportedTaxon
Verbatim
e0“TYLCV-tolerant cross P2 × P4 was a good combination for TYLCV mean score, TY/plant, AFW, fruit firmness, and fruit TSS content traits”
Claim · model-written summary
P1 × P4 combined TYLCV score, yields and titratable acidity.
- Material
- P1 × P4e0
- Interactor
- TYLCVTomato yellow leaf curl viruse0pathogen
- Outcome
- TYLCV mean score, EY/plant, TY/plant and fruit titarable acidity content traitse0
Not reportedTaxon
Verbatim
e0“TYLCV-tolerant cross P1 × P4 was a good combination for TYLCV mean score, EY/plant, TY/plant and fruit titarable acidity content traits.”