Influence of Drought on Mitochondrial Activity, Photosynthesis, Nocturnal Acid Accumulation and Water Relations in the CAM Plants Prenia sladeniana(ME-type) and Crassula lycopodioides(PEPCK-type)

Responses of plant biomass, photosynthesis and lipid peroxidation to warming and precipitation change in two dominant species (Stipa grandis and Leymus chinensis) from North China Grasslands

“…F v / F m is the maximum photochemical efficiency of PSII under dark adaptation. Having been widely used for the detection of photoinhibition, it reflects the maximum efficiency of the photosynthetic apparatus that converts absorbed light energy into chemical reactions (Dickmann et al., ; Herppich and Peckmann ). The present results (Fig.…”

Impacts of drought on leaf respiration in darkness and light in Eucalyptus saligna exposed to industrial‐age atmospheric CO2 and growth temperature

“…, 2001). Given that in vitro activity of several key respiratory enzymes is generally unaffected by mild to moderate water stress (Herppich & Peckmann, 2000), and that respiratory capacity rarely limits respiratory flux when measured at moderate temperatures (Atkin et al. , 2005), it seems unlikely that reduced respiratory capacity was responsible for the reduced rates of leaf R under drought.…”

“…The inhibitory effect of drought on leaf R was unlikely to have been caused by limitations in substrate supply, because sugar concentrations were largely homeostatic across all treatments, as has been previously observed (Ghashghaie et al, 2001). Given that in vitro activity of several key respiratory enzymes is generally unaffected by mild to moderate water stress (Herppich & Peckmann, 2000), and that respiratory capacity rarely limits respiratory flux when measured at moderate temperatures , it seems unlikely that reduced respiratory capacity was responsible for the reduced rates of leaf R under drought. Rather, the decrease in leaf R under drought was more likely to have been a reflection of reduced demand for respiratory products.…”

Metabolic control and regulation of the tricarboxylic acid cycle in photosynthetic and heterotrophic plant tissues

“…Several studies on the effect of severe drought stress on respiratory pathways have revealed contrasting results, as respiration remained unaltered in soybean (Ribas-Carbo et al 2005), increased in wheat (Bartoli et al 2005), and decreased in bean and pepper (Gonzalez-Meler, Matamala & Penuelas 1997). Nevertheless, the effects of mild to moderate water stress were relatively small on the mitochondrial activity of several key TCA cycle enzymes in two CAM species (Herppich & Peckmann 2000). However, changes in the in vivo activities of the cytochrome oxidase (COX) and alternative oxidase (AOX) pathways, measured with the oxygen isotope fractionation technique that has been demonstrated to be the most reliable technique for the studies of electron partitioning between the two main respiratory pathways (Ribas-Carbo et al 1995;Day et al 1996), have been reported by Ribas-Carbo and colleagues (Ribas-Carbo et al 2005;Flexas et al 2006).…”