Claim · model-written summary
In wheat cultivars NP 823 and NP 824, the increase in average shoot weight during the fortnight after anthesis fell from 100 in sunlight to 43, 24 and 10 under the three lower light intensities.
Triticum aestivumVerbatim
e0“Under average tight intensities, 57,800 (sunlight, L), 12,900 (l 1 ), 3900 (1 2 ) and 3300 (1 3 ) lux, during the fortnight after anthesis”
e1“the increase in the average shoot weight (excluding roots) of wheat cultivars, NP 823 and NP 824, varied as 100, 43, 24 and 10, and of cultivars, Ph C 281 and NP720, as 100, 35, 15 and 9”
Title
R. D. Asana; S. R. Parvatikar; N. P. Saxena Physiologia Plantarum 1969. doi:10.1111/j.1399-3054.1969.tb07450.x
Other claims from this paper (19)
- Intervention effect In wheat cultivars Ph C 281 and NP720, the increase in average shoot weight fell from 100 in sunlight to 35, 15 and 9 under the three lower light intensities.
- Intervention effect In the first cultivar group, the increase in ear weight fell from 100 in sunlight to 59, 45 and 40 under the three lower light intensities.
- Intervention effect In the second cultivar group, the increase in ear weight fell from 100 in sunlight to 58, 53 and 33 under the three lower light intensities.
- Observation The increase in ear weight was relatively less affected by low light intensity than the increase in shoot weight.
- Mechanism The authors suggest, as a probable explanation, that stem sugars were utilized in grain filling.
- Observation Stem sugars increased only in full sunlight (L).
- Observation Stem sugars decreased under the three lower light intensities.
- Intervention effect Grain number and grain weight were reduced under the three lower light intensities.
- Mechanism The authors infer that during the fortnight after anthesis current photosynthesis largely, but not entirely, determines the rate of grain growth.
- Intervention effect After transfer to full sunlight, grain weight at maturity of plants from the l 1 treatment was 93% of that of L.
- Intervention effect After transfer to full sunlight, grain weight at maturity of plants from the 1 2 treatment was 78% of that of L.
- Intervention effect After transfer to full sunlight, grain weight at maturity of plants from the 1 3 treatment was 77% of that of L.
- Intervention effect The actual increase in grain weight was the same in L and l 1.
- Intervention effect The actual increase in grain weight was slightly lower in l 2 and 1 3 than in L.
- Mechanism The authors infer that the same amount of photosynthate was produced in all four treatments but was not fully utilized in 1 2 and 1 3 because of considerable reduction in grain number.
- Mechanism The authors conclude that the level of stem sugars does not determine the rate of grain growth.
- Intervention effect During the fortnight before maturity, light intensity as low as 2500 lux had little effect on grain development.
- Recommendation The authors conclude that light intensity equal to full sunlight may not be required during the entire course of grain development.
- Recommendation The authors suggest that a more efficient sink (the ear) may allow photosynthates to be used more effectively and raise yield potential further.
Helianthus annuus
Lactuca sativa
Zea mays