Effects of polyploidy on photosynthetic properties and anatomy in leaves of Phlox drummondii

Functional Plant Biology : FPB
Poonam VyasSachiko Funayama-Noguchi

Abstract

Polyploidy affects photosynthesis by causing changes in morphology, anatomy and biochemistry. However, in newly developed polyploids, the genome may be unstable. In this study, diploid (2×) and synthetic autotetraploids in initial (4×-C0) and 11th generations (4×-C11) of Phlox drummondii Hook were used to study the effects of chromosome doubling and genome stabilisation on leaf photosynthesis and anatomical properties. The light-saturated photosynthetic rate on a leaf area basis at 360 µmol CO2 mol-1 air (A360) was highest in 4×-C11 leaves, intermediate in 4×-C0 leaves, and lowest in 2× leaves. Rubisco amounts, CO2-saturated photosynthetic rate at 1200 µmol CO2 mol-1 air at PPFD of 1000 µmol m-2 s-1 (A1200, representing the capacity for RuBP regeneration), cumulative surface areas of chloroplasts facing intercellular spaces (Sc), all expressed on a leaf area basis, were all higher in 4× leaves than in 2× leaves, and stomatal conductance (gs) at 360 µmol CO2 mol-1 air was only higher in the 4×-C11 leaves. A360 for the 4×-C11 leaves was greater than that in the 4×-C0 leaves despite having similar amounts of Rubisco. This was presumably associated with a greater RuBP regeneration capacity, as well as an increase in Sc and gs, whic...Continue Reading

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Citations

Jun 25, 2014·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Pamela S SoltisDouglas E Soltis
Jan 12, 2013·Journal of Experimental Botany·Riccardo AversanoDomenico Carputo
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Aug 18, 2021·The Plant Journal : for Cell and Molecular Biology·Miguel Barceló-AnguianoJuan M Losada

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