Abstract
Abstract Pollen characteristics are very important for Iris interspecific hybridisation. In this study, the pollen viability and male meiosis were studied in yellow-flowered Iris dichotoma (Y2), I. domestica (S3) and their hybrids F 1 , F 2 and BC 1 (BC 1 -Y and BC 1 -S). The BC 1 -Y hybrids showed higher pollen viability than that of F 1 , F 2 and BC 1 -S hybrids, which were between I. dichotoma (26.1%) and I. domestica (35.1%). Two sterile hybrids, F 2 -1 and BC 1 -S-1, exhibited more meiotic abnormalities (57.3% and 58.7%) than other individuals. During the first meiotic division, a diffuse diplotene stage was observed for the first time in the genus Iris . The meiotic abnormalities included non-congressed chromosomes, chromosome bridges, lagging chromosomes, unequal division, abnormally oriented spindle fibres, nonsynchronous division and polyad, and resulted in reduced pollen fertility. The relatively high frequency of 2n pollen grains was found in hybrids of BC 1 -Y-2, BC 1 -Y-1, BC 1 -S-2, BC 1 -S-3 and BC 1 -S-4. Our research provides a new resource for meiotic behaviour and pollen fertility of the genus Iris .
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Claims 6
Claim · model-written summary
BC 1 -Y hybrids had higher pollen viability than F 1, F 2, and BC 1 -S hybrids.
- Taxon
- I. dichotoma
Iris dichotomae0 - Material
- BC 1 -Ye0
- Outcome
- pollen viabilitye0
- Direction
- highere0
- Comparator
- F 1 , F 2 and BC 1 -S hybridse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The BC 1 -Y hybrids showed higher pollen viability than that of F 1 , F 2 and BC 1 -S hybrids, which were between I. dichotoma (26.1%) and I. domestica (35.1%)”
Claim · model-written summary
The sterile F 2 -1 hybrid had 57.3% meiotic abnormalities, more than other individuals.
IrisOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Two sterile hybrids, F 2 -1 and BC 1 -S-1, exhibited more meiotic abnormalities (57.3% and 58.7%) than other individuals”
t0“Iris dichotoma and I. domestica”
Claim · model-written summary
The sterile BC 1 -S-1 hybrid had 58.7% meiotic abnormalities, more than other individuals.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Two sterile hybrids, F 2 -1 and BC 1 -S-1, exhibited more meiotic abnormalities (57.3% and 58.7%) than other individuals”
t0“Iris dichotoma and I. domestica”
Claim · model-written summary
A diffuse diplotene stage in the first meiotic division was observed for the first time in Iris.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“During the first meiotic division, a diffuse diplotene stage was observed for the first time in the genus Iris”
Claim · model-written summary
Meiotic abnormalities were associated with reduced pollen fertility.
- Organ / stage
- chromosomese0
- Outcome
- pollen fertilitye0
- Direction
- reducede0
- Qualifier
- meiotic abnormalitiese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The meiotic abnormalities included non-congressed chromosomes, chromosome bridges, lagging chromosomes, unequal division, abnormally oriented spindle fibres, nonsynchronous division and polyad, and resulted in reduced pollen fertility”
t0“Iris dichotoma and I. domestica”
Claim · model-written summary
The listed BC 1 hybrids had relatively frequent 2n pollen grains.
- Material
- BC 1 -Y-2, BC 1 -Y-1, BC 1 -S-2, BC 1 -S-3 and BC 1 -S-4e0
- Outcome
- frequency of 2n pollen grainse0
- Direction
- relatively highe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The relatively high frequency of 2n pollen grains was found in hybrids of BC 1 -Y-2, BC 1 -Y-1, BC 1 -S-2, BC 1 -S-3 and BC 1 -S-4”
t0“Iris dichotoma and I. domestica”