Abstract
Divergent phenotypic selection was performed for cell membrane thermostability (CMS) in wheat (Triticum aestivum L.) in five F2 populations derived from crosses established between eight local landraces quite variable in heat susceptibility index. CMS was assayed in the flag leaves of field-hardened segregating plants at anthesis. Selection was imposed on 200 F2 spaced plants for each of the five populations where the highest and the lowest five plants in CMS were selected. Responses in CMS and a number of agronomic traits were measured in the F3 descending families of the selected F2 plants against the F3 bulks. Significant responses to selection for CMS were obtained in both directions in the five populations which averaged 19.52% in the high and 11.9 % in the low CMS direction. The realized heritability estimates for CMS which were similar to the calculated parent-offspring regressions ranged from low (0.09 and 0.22) to intermediate (0.34, 0.53 and 0.57). Selection for high CMS produced concurrent positive responses in grain weight per spike in the five populations which averaged 15.72% whereas selection for low CMS reduced grain weight per spike in only two populations with an average reduction of 5.2%. The realized heritability estimates for grain weight per spike ranged from low (0.39) to moderately high (0.70). Significant correlated responses to selection for CMS were obtained in 1000 grain weight in the five populations which averaged 8.25% of population mean in the high direction indicating an improved grain filling capacity. With selection for low CMS, the 1000 grain weight was reduced by 6.09% on average indicating impaired capacity for grain filling. The realized heritability for 1000 grain weight ranged from 0.57 to 0.88. Significant concurrent responses to selection for high CMS were obtained in grain yield per plant only in two of the five populations. Meanwhile, selection for low CMS was not effective in reducing grain yield per plant in four of the five populations. Such limited effect of CMS on grain yield per plant could be attributed to the confounding effect of earliness as an escaping mechanism or heat voidance which might support yield of the unselected base populations as well as the low CMS selections. The realized heritability estimates of grain yield per plant under heat stress were low ranging from 0.09 to 0.43.
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Claims 12
Claim · model-written summary
High CMS selection increased CMS by 19.52% on average.
- Taxon
- Triticum aestivum L.
Triticum aestivumt0 - Treatment
- selection for CMSe0
- Outcome
- CMSe0
- Direction
- highe0
- Value
- 19.52%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“BREAD WHEAT (Triticum aestivum L.)”
e0“Significant responses to selection for CMS were obtained in both directions in the five populations which averaged 19.52% in the high and 11.9 % in the low CMS direction.”
Claim · model-written summary
Low CMS selection decreased CMS by 11.9% on average.
- Taxon
- Triticum aestivum L.Triticum aestivumt0
- Treatment
- selection for CMSe0
- Outcome
- CMSe0
- Direction
- lowe0
- Value
- 11.9 %e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“BREAD WHEAT (Triticum aestivum L.)”
e0“Significant responses to selection for CMS were obtained in both directions in the five populations which averaged 19.52% in the high and 11.9 % in the low CMS direction.”
Claim · model-written summary
CMS realized heritability ranged from 0.09 to 0.57.
- Taxon
- Triticum aestivum L.Triticum aestivumt0
- Outcome
- CMSe0
- Value
- 0.09 and 0.22e0
- Qualifier
- 0.34, 0.53 and 0.57e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“BREAD WHEAT (Triticum aestivum L.)”
e0“The realized heritability estimates for CMS which were similar to the calculated parent-offspring regressions ranged from low (0.09 and 0.22) to intermediate (0.34, 0.53 and 0.57).”
Claim · model-written summary
High CMS selection increased grain weight per spike by 15.72% on average.
- Taxon
- Triticum aestivum L.Triticum aestivumt0
- Treatment
- Selection for high CMSe0
- Outcome
- grain weight per spikee0
- Direction
- positive responsese0
- Value
- 15.72%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“BREAD WHEAT (Triticum aestivum L.)”
e0“Selection for high CMS produced concurrent positive responses in grain weight per spike in the five populations which averaged 15.72%”
Claim · model-written summary
Low CMS selection reduced grain weight per spike by 5.2% in two populations.
- Taxon
- Triticum aestivum L.Triticum aestivumt0
- Treatment
- selection for low CMSe0
- Outcome
- grain weight per spikee0
- Direction
- reducede0
- Value
- 5.2%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“BREAD WHEAT (Triticum aestivum L.)”
e0“selection for low CMS reduced grain weight per spike in only two populations with an average reduction of 5.2%.”
Claim · model-written summary
Grain weight per spike heritability ranged from 0.39 to 0.70.
- Taxon
- Triticum aestivum L.Triticum aestivumt0
- Outcome
- grain weight per spikee0
- Value
- 0.39e0
- Qualifier
- 0.70e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“BREAD WHEAT (Triticum aestivum L.)”
e0“The realized heritability estimates for grain weight per spike ranged from low (0.39) to moderately high (0.70).”
Claim · model-written summary
High CMS selection increased 1000 grain weight by 8.25% on average.
- Taxon
- Triticum aestivum L.Triticum aestivumt0
- Treatment
- selection for CMSe0
- Outcome
- 1000 grain weighte0
- Direction
- high directione0
- Value
- 8.25%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“BREAD WHEAT (Triticum aestivum L.)”
e0“Significant correlated responses to selection for CMS were obtained in 1000 grain weight in the five populations which averaged 8.25% of population mean in the high direction”
Claim · model-written summary
Low CMS selection reduced 1000 grain weight by 6.09% on average.
- Taxon
- Triticum aestivum L.Triticum aestivumt0
- Treatment
- selection for low CMSe0
- Outcome
- 1000 grain weighte0
- Direction
- reducede0
- Value
- 6.09%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“BREAD WHEAT (Triticum aestivum L.)”
e0“With selection for low CMS, the 1000 grain weight was reduced by 6.09% on average”
Claim · model-written summary
1000 grain weight heritability ranged from 0.57 to 0.88.
- Taxon
- Triticum aestivum L.Triticum aestivumt0
- Outcome
- 1000 grain weighte0
- Value
- 0.57 to 0.88e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“BREAD WHEAT (Triticum aestivum L.)”
e0“The realized heritability for 1000 grain weight ranged from 0.57 to 0.88.”
Claim · model-written summary
High CMS selection significantly increased grain yield per plant in two populations.
- Taxon
- Triticum aestivum L.Triticum aestivumt0
- Treatment
- selection for high CMSe0
- Outcome
- grain yield per plante0
- Direction
- highe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“BREAD WHEAT (Triticum aestivum L.)”
e0“Significant concurrent responses to selection for high CMS were obtained in grain yield per plant only in two of the five populations.”
Claim · model-written summary
Low CMS selection did not reduce grain yield per plant in four populations.
- Taxon
- Triticum aestivum L.Triticum aestivumt0
- Treatment
- selection for low CMSe0
- Outcome
- grain yield per plante0
- Direction
- not effective in reducinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“BREAD WHEAT (Triticum aestivum L.)”
e0“selection for low CMS was not effective in reducing grain yield per plant in four of the five populations.”
Claim · model-written summary
Grain yield per plant heritability under heat stress ranged from 0.09 to 0.43.
- Taxon
- Triticum aestivum L.Triticum aestivumt0
- Outcome
- grain yield per plante0
- Value
- 0.09 to 0.43e0
- Qualifier
- under heat stresse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“BREAD WHEAT (Triticum aestivum L.)”
e0“The realized heritability estimates of grain yield per plant under heat stress were low ranging from 0.09 to 0.43.”