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- Title
Variation in leaf-level photosynthesis among switchgrass genotypes exposed to low temperatures does not scale with final biomass yield.
- Authors
Cordero, Ángel; Osborne, Bruce A.
- Abstract
The effect of a 10-day low-temperature treatment and subsequent recovery of 13 genotypes of switchgrass, including upland and lowland types, resulted in significant variations in a number of leaf-level photosynthetic parameters. Whilst the most resistant genotype (Blackwell) is an upland type, there was no clear separation of upland and lowland genotypes in terms of the resistance of leaf photosynthesis (Asat, ϕ CO2max, Vp and Vpmax), respiration (Rd) or fluorescence (Fv/Fm) parameters to low temperatures, with lowland types also achieving higher biomass yields than upland types. Examination of the reason for differences in the impact of low temperatures on leaf photosynthesis indicated that this could be due to both PEP carboxylase activity and/or PEP regeneration, but with some support for PEP regeneration being the more important. However, variations in leaf photosynthesis were not related to the final biomass yield in either control or low-temperature-exposed plants, and the best correlation was found with leaf area. Low temperatures were found to have a post-treatment impact on leaf area development through a reduction in the formation of new leaves. Overall, these results suggest that more attention should be directed at variations in the effect of low temperature on leaf initiation and emergence to exploit the wider use of switchgrass as a biomass-bioenergy crop.
- Subjects
SWITCHGRASS; PHOTOSYNTHESIS; GENOTYPES; LOW temperatures; RESPIRATION in plants; PLANT biomass; CARBOXYLASES
- Publication
GCB Bioenergy, 2017, Vol 9, Issue 1, p144
- ISSN
1757-1693
- Publication type
Article
- DOI
10.1111/gcbb.12349