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Leaf N content regulates the speed of photosynthetic induction under fluctuating light among canola genotypes (Brassica napus L.).
- Source :
-
Physiologia plantarum [Physiol Plant] 2021 Aug; Vol. 172 (4), pp. 1844-1852. Date of Electronic Publication: 2021 Apr 13. - Publication Year :
- 2021
-
Abstract
- Nitrogen is an essential element for plant growth, and the relationship between leaf N content and photosynthesis has been widely studied in different species under steady-state light. However, under natural conditions, the light intensity at the leaf level is always changing, inherently heterogeneous in time and space. Therefore, the effect of leaf N content on photosynthesis under dynamic light conditions needs further study. At present, the effects of leaf N content on leaf non-steady-state photosynthesis have not been reported in canola (Brassica napus L.). To clarify the relationship between leaf N content and the speed of the response leaf gas exchange to variations in light intensity, eight genotypes of canola varying in leaf N content were used to study the temporal response of gas exchange to a step increase in irradiance. We found there were significant differences in non-steady-state photosynthesis, physiological characteristics, and anatomical traits across genotypes (the maximum amplitude was about fivefold), despite the lack of contrast under normal, steady-state photosynthesis. In addition, initial stomatal conductance to water vapor in the darkness and leaf N content per leaf area were negatively correlated with the time required to achieve 50% and 100% of the maximum photosynthetic rate. Contrarily, the time required to reach 50% of the maximum stomatal conductance was positively correlated with the time required to achieve 90% of the maximum photosynthetic rate across genotypes. It is concluded that the genotypes of canola with higher N content per leaf area show a faster induction of photosynthesis to fluctuating light conditions.<br /> (© 2021 Scandinavian Plant Physiology Society.)
- Subjects :
- Genotype
Light
Photosynthesis
Plant Leaves
Brassica napus genetics
Subjects
Details
- Language :
- English
- ISSN :
- 1399-3054
- Volume :
- 172
- Issue :
- 4
- Database :
- MEDLINE
- Journal :
- Physiologia plantarum
- Publication Type :
- Academic Journal
- Accession number :
- 33748976
- Full Text :
- https://doi.org/10.1111/ppl.13390