Abstract
Abstract Structural genes of pollen are expressed in both sporophytic and gametophytic generations. This genetic overlap makes possible superior pollen genotype selection. Pollen selection is more effective than sporophytic selection since more pollen grains can be exposed to selection pressure at the haploid level. In this study, selection pressure was applied in the F 1 generation at the pollen level for heat tolerance. The frequencies of heat‐tolerant plants were studied for seed yield in F 2 and F 3 generations and for seedling heat tolerance in F 4 generations. The heat‐susceptible inbred line BTM4 was crossed to heat‐tolerant inbred line BTM6 of maize ( Zea mays L.). In response to heat stress, we compared F 2 plants produced by selfing of heat‐stressed pollen grains and without heat‐stressed pollen grains. The resulting F 2 plants from heat‐stressed pollen grains showed significantly higher seed yield per plant (5.41 ± 0.31 g) than control F 2 (2.90 ± 0.19 g) populations under stress. The selected and control F 2 plants were also subjected to genotyping using simple sequence repeat (SSR) primers. We observed that the frequency of alleles from tolerant parents was higher in selected F 2 populations, providing genetic evidence for positive effect of pollen selection. The heat tolerance of F 4 generation progenies of the same cross suggested that the cyclic pollen selection for heat tolerance in F 1 , F 2 , and F 3 generations has significantly improved the tolerance of progenies. The results from this study demonstrate that the feasibility of this approach seems to be promising for hastening the incorporation of desirable alleles in a short time.
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Claims 4
Claim · model-written summary
Under heat stress, F2 plants from heat-stressed pollen grains had significantly higher seed yield per plant (5.41 ± 0.31 g) than control F2 (2.90 ± 0.19 g).
- Treatment
- heat‐stressed pollen grainse1
- Outcome
- seed yield per plante1
- Direction
- highere1
- Value
- 5.41 ± 0.31 ge1
- Qualifier
- 2.90 ± 0.19 ge1
- Comparator
- control F 2e1
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The resulting F 2 plants from heat‐stressed pollen grains showed significantly higher seed yield per plant (5.41 ± 0.31 g) than control F 2 (2.90 ± 0.19 g) populations under stress”
t0“maize”
Claim · model-written summary
The frequency of alleles from the tolerant parent was higher in selected F2 populations, giving genetic evidence for a positive effect of pollen selection.
- Treatment
- selected F 2 populationse1
- Outcome
- frequency of alleles from tolerant parentse1
- Direction
- highere1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“We observed that the frequency of alleles from tolerant parents was higher in selected F 2 populations”
t0“maize”
Claim · model-written summary
Cyclic pollen selection for heat tolerance in F1, F2 and F3 generations significantly improved the tolerance of F4 progenies.
- Treatment
- cyclic pollen selection for heat tolerancee1
- Outcome
- tolerance of progeniese1
- Direction
- improvede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“cyclic pollen selection for heat tolerance in F 1 , F 2 , and F 3 generations has significantly improved the tolerance of progenies”
t0“maize”
Claim · model-written summary
The authors conclude that pollen selection appears promising for hastening incorporation of desirable alleles in a short time.
- Outcome
- hastening the incorporation of desirable allelese1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“the feasibility of this approach seems to be promising for hastening the incorporation of desirable alleles in a short time”
t0“maize”
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