Abstract
The success of Triticum aestivum × Zea mays crosses, used to produce wheat doubled haploids, is influenced by light intensity. To examine the basis for this response, pollen tube growth, embryo survival and indicators of photosynthetic rate were measured in two wheat cultivars (‘Karamu’ and ‘Kotuku’) crossed with maize at two irradiance levels (250 or 750 μmol m −2 s −1 , PAR). Pollen tube growth was significantly affected by light intensity in ‘Karamu’ plants but not in ‘Kotuku’ plants, despite both cultivars being pollinated by the same maize source. The percentage of pollen tubes reaching the cavity between the ovarian wall and integuments, or in the micropyle of ‘Karamu’ plants at high light intensity (65%) was nearly three-times greater than that at low light intensity (22%). Thus, either low light intensity can affect the maternal wheat plant in a way that inhibits pollen tube growth and/or high light intensity may promote pollen tube growth in ‘Karamu’ plants. Significant differences in rates of electron transport in plants grown at the two light intensities indicated that the rate of photosynthesis may also have an effect on pollen tube growth. These results have importance for improving the efficiency of wheat × maize crosses and other wide cereal crosses. Copyright 2001 Annals of Botany Company
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Claims 4
Claim · model-written summary
Light intensity significantly affected pollen tube growth in Karamu wheat.
- Taxon
- Wheat
Triticum aestivumt0 - Material
- ‘Karamu’e0
- Treatment
- light intensitye0
- Outcome
- Pollen tube growthe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pollen tube growth was significantly affected by light intensity in ‘Karamu’ plants but not in ‘Kotuku’ plants”
t0“Wheat × Maize Crosses”
Claim · model-written summary
Light intensity did not significantly affect pollen tube growth in Kotuku wheat.
- Taxon
- WheatTriticum aestivumt0
- Material
- ‘Kotuku’e0
- Treatment
- light intensitye0
- Outcome
- Pollen tube growthe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pollen tube growth was significantly affected by light intensity in ‘Karamu’ plants but not in ‘Kotuku’ plants”
t0“Wheat × Maize Crosses”
Claim · model-written summary
At high light, 65% of Karamu pollen tubes reached the ovarian cavity or micropyle versus 22% at low light.
- Taxon
- WheatTriticum aestivumt0
- Material
- ‘Karamu’e0
- Treatment
- high light intensitye0
- Outcome
- percentage of pollen tubes reaching the cavity between the ovarian wall and integuments, or in the micropylee0
- Direction
- greatere0
- Value
- 65%e0
- Qualifier
- 22%e0
- Comparator
- low light intensitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The percentage of pollen tubes reaching the cavity between the ovarian wall and integuments, or in the micropyle of ‘Karamu’ plants at high light intensity (65%) was nearly three-times greater than that at low light intensity (22%)”
t0“Wheat × Maize Crosses”
Claim · model-written summary
Electron transport rates differed significantly between light intensities.
- Taxon
- WheatTriticum aestivumt0
- Treatment
- two light intensitiese0
- Outcome
- rates of electron transporte0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Significant differences in rates of electron transport in plants grown at the two light intensities”
t0“Wheat × Maize Crosses”