Long-term night chilling of cotton (Gossypium hirsutum) does not result in reduced CO2 assimilation

Functional Plant Biology : FPB
Bir SinghA Scott Holaday

Abstract

The aim of this study was to characterise the response of CO2 assimilation (A) of cotton (Gossypium hirsutum L.) to short- and long-term exposures to night chilling. We hypothesised that short-term exposures to night chilling would induce reductions in gs and, therefore, A during the following days, while growth of cotton plants for several weeks in cool night conditions would cause elevated leaf carbohydrate content, leading to the down-regulation of the capacity for A. Transferring warm-grown seedlings of wild type cotton, transgenic cotton with elevated sucrose-phosphate synthase activity (SPS+) that might produce and export more sucrose from the leaf, and a segregating null to cool nights (9°C minimum) for 1 or 2 d caused a small reduction in A (12%) and gs (21-50%) measured at 28°C. Internal CO2 did not change, suggesting some biochemical restriction of A along with a gs restriction. After 30 d, new leaves that developed in cool nights exhibited acclimation of A and partial acclimation of gs. Despite the elevated leaf carbohydrate content when plants were grown to maturity with night chilling, no reduction in A, gs, carboxylation capacity, electron transport capacity, or triose-phosphate utilisation capacity occurred. Inst...Continue Reading

References

Aug 29, 2000·Plant Science : an International Journal of Experimental Plant Biology·C Lawrence, A S Holaday
Jul 18, 2001·Journal of Experimental Botany·M J Paul, C H Foyer
Jan 1, 2003·Journal of Experimental Botany·Matthew J Paul, Till K Pellny
Oct 18, 2005·Photosynthesis Research·W T PettigrewK C Vaughn
Oct 1, 1972·Plant Physiology·J Downton, R O Slatyer
Oct 1, 1990·Plant Physiology·S D Wullschleger, D M Oosterhuis
Mar 1, 1992·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·C BayleyD W Ow

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transgenic
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Photosynthesis Assistant

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