期刊
PLANT CELL AND ENVIRONMENT
卷 41, 期 6, 页码 1427-1437出版社
WILEY
DOI: 10.1111/pce.13180
关键词
steady state and dynamic photosynthesis; NPQ relaxation
资金
- European Space Agency [4000107143/12/NL/FF/If]
- COST Action [ES1309/OPTIMISE]
- Optimise Cost Action [ES1309, COST-STSM-ES1309-34429]
The photosynthetic, optical, and morphological characteristics of a chlorophyll-deficient (Chl-deficient) yellow soybean mutant (MinnGold) were examined in comparison with 2 green varieties (MN0095 and Eiko). Despite the large difference in Chl content, similar leaf photosynthesis rates were maintained in the Chl-deficient mutant by offsetting the reduced absorption of red photons by a small increase in photochemical efficiency and lower non-photochemical quenching. When grown in the field, at full canopy cover, the mutants reflected a significantly larger proportion of incoming shortwave radiation, but the total canopy light absorption was only slightly reduced, most likely due to a deeper penetration of light into the canopy space. As a consequence, canopy-scale gross primary production and ecosystem respiration were comparable between the Chl-deficient mutant and the green variety. However, total biomass production was lower in the mutant, which indicates that processes other than steady state photosynthesis caused a reduction in biomass accumulation over time. Analysis of non-photochemical quenching relaxation and gas exchange in Chl-deficient and green leaves after transitions from high to low light conditions suggested that dynamic photosynthesis might be responsible for the reduced biomass production in the Chl-deficient mutant under field conditions.
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