Sucrose‐phosphate synthase responds differently to source‐sink relations and to photosynthetic rates: Lolium perenne L. growing at elevated pCO2 in the field

Isopp, Hubert; Frehner, Monika; Long, Stephen P.; Nösberger, J.

doi:10.1046/j.1365-3040.2000.00583.x

Cited by 74 publications

(61 citation statements)

References 42 publications

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“…The activity was significantly correlated with sucrose accumulation in stems, in agreement with the view that SPS plays a major role in the resynthesis of sucrose (Whittingham et al 1979;Wardlaw and Willenbrink 1994). The significance of an enhanced SPS activity under water stress is that not only does the plant accumulate the disaccharide as a response to the stress (Quick et al 1989;Toroser and Huber 1997;Escobar-Gutierrez et al 1998), but it also sustains the assimilatory carbon fluxes from source to sink (Isopp et al 2000).…”

Section: Discussionsupporting

confidence: 84%

Abscisic acid and cytokinins in the root exudates and leaves and their relationship to senescence and remobilization of carbon reserves in rice subjected to water stress during grain filling

Yang

Zhang

Wang

et al. 2002

Planta

223

139

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The possible regulation of senescence-initiated remobilization of carbon reserves in rice (Oryza sativa L.) by abscisic acid (ABA) and cytokinins was studied using two rice cultivars with high lodging resistance and slow remobilization. The plants were grown in pots and either well-watered (WW, soil water potential = 0 MPa) or water-stressed (WS, soil water potential = -0.05 MPa) from 9 days after anthesis until they reached maturity. Leaf water potentials of both cultivars markedly decreased at midday as a result of water stress but completely recovered by early morning. Chlorophyll (Chl) and photosynthetic rate (Pr) of the flag leaves declined faster in WS plants than in WW plants, indicating that the water deficit enhanced senescence. Water stress accelerated starch remobilization in the stems, promoted the re-allocation of pre-fixed (14)C from the stems to grains, shortened the grain-filling period and increased the grain-filling rate. Sucrose phosphate synthase (SPS, EC 2.4.1.14) activity was enhanced by water stress and positively correlated with sucrose accumulation in both the stem and leaves. Water stress substantially increased ABA but reduced zeatin (Z) + zeatin riboside (ZR) concentrations in the root exudates and leaves. ABA significantly and negatively, while Z+ZR positively, correlated with Pr and Chl of the flag leaves. ABA, not Z+ZR, was positively and significantly correlated with SPS activity and remobilization of pre-stored carbon. Spraying ABA reduced Chl in the flag leaves, and enhanced SPS activity and remobilization of carbon reserves. Spraying kinetin had the opposite effect. The results suggest that both ABA and cytokinins are involved in controlling plant senescence, and an enhanced carbon remobilization is attributed to an elevated ABA level in rice plants subjected to water stress.

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Section: Discussionsupporting

confidence: 84%

Abscisic acid and cytokinins in the root exudates and leaves and their relationship to senescence and remobilization of carbon reserves in rice subjected to water stress during grain filling

Yang

Zhang

Wang

et al. 2002

Planta

223

139

View full text Add to dashboard Cite

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“…More photosynthates would restrain photosynthesis if no new sink is available to accommodate superfluous assimilation [23], [30], [31], resulting in photosynthetic acclimation. Photosynthetic acclimation occurs in rice flag leaves under FACE because N content in the leaves was reduced under a high N demand for reproductive development, but not in the eighth leaf stage when vegetative growth occured [32].…”

Section: Discussionmentioning

confidence: 99%

Effects of Fully Open-Air [CO2] Elevation on Leaf Photosynthesis and Ultrastructure of Isatis indigotica Fort

Hao

Feng

et al. 2013

PLoS ONE

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Traditional Chinese medicine relies heavily on herbs, yet there is no information on how these herb plants would respond to climate change. In order to gain insight into such response, we studied the effect of elevated [CO2] on Isatis indigotica Fort, one of the most popular Chinese herb plants. The changes in leaf photosynthesis, chlorophyll fluorescence, leaf ultrastructure and biomass yield in response to elevated [CO2] (550±19 µmol mol–1) were determined at the Free-Air Carbon dioxide Enrichment (FACE) experimental facility in North China. Photosynthetic ability of I. indigotica was improved under elevated [CO2]. Elevated [CO2] increased net photosynthetic rate (P N), water use efficiency (WUE) and maximum rate of electron transport (J max) of upper most fully-expended leaves, but not stomatal conductance (gs), transpiration ratio (Tr) and maximum velocity of carboxylation (V c,max). Elevated [CO2] significantly increased leaf intrinsic efficiency of PSII (Fv’/Fm’) and quantum yield of PSII(ΦPS II), but decreased leaf non-photochemical quenching (NPQ), and did not affect leaf proportion of open PSII reaction centers (qP) and maximum quantum efficiency of PSII (Fv/Fm). The structural chloroplast membrane, grana layer and stroma thylakoid membranes were intact under elevated [CO2], though more starch grains were accumulated within the chloroplasts than that of under ambient [CO2]. While the yield of I. indigotica was higher due to the improved photosynthesis under elevated [CO2], the content of adenosine, one of the functional ingredients in indigowoad root was not affected.

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“…Besides the thermal regime influence, the long-term exposures of soybean plants to elevated [CO 2 ] can also change source-sink relations, , and grain filling (Isopp et al, 2000;Kumagai et al, 2012). This further result in high weight of seeds.…”

Section: Pods Grains and The Thousand Grain Weight Per Plantmentioning

confidence: 99%

Response of soybean yield components and allocation of dry matter to increased temperature and CO2 concentration

Pereira-Flores¹,

Justino²,

Ruiz‐Vera³

et al. 2016

Aust J Crop Sci

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Future climatic scenarios can influence crop yield levels and induce hunger if no actions are taken. In this study, we evaluated the effect of increased temperature and CO 2 concentration on soybean yield components and biomass partitioning, that ultimately determine the crops productivity. This is conducted for two soybean genotypes that differ in their canopy and life cycles. Experiments were set as follows: a) T1 -ambient temperature and 390 molCO 2 •mol -1 , b) T2 -ambient air temperature +2.7 o C and ambient CO2, and c) T3 -ambient air temperature + 2.7 o C and 750 molCO 2 •mol -1 . Results indicate that soybean under elevated CO 2 and temperature (T3), were taller and grains weighed more than under the ambient conditions in both cultivars types. However, yield has not increased substantially due to reductions in the ratio of number of branch/plant, pods/branch and grains/branch which lead also to a lesser number of total pods and grains per plant. The increase of temperature favored the number of pods and grains on branches in the modern type cultivar, and on racemes in the old cultivar. This results in more yield in both cultivars versus plants grown in the current ambient, and higher CO 2 concentration plus temperature. In both cultivars, the pods and grains partition were higher on the ontogenically oldest four branches and racemes, with decrease in the other upper ones. In addition, the biomass allocation in vegetative tissues was higher than reproductive biomass, with intensity cultivar dependent. We concluded that in future the yield could be limited by reduction of the numbers of branches and racemes in plant, and by alteration at source-sink relation, thus, indicating that changes in canopy architecture are needed to better take advantage of the increasing concentration of CO 2 .

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Sucrose‐phosphate synthase responds differently to source‐sink relations and to photosynthetic rates: Lolium perenne L. growing at elevated p_CO2 in the field

Cited by 74 publications

References 42 publications

Abscisic acid and cytokinins in the root exudates and leaves and their relationship to senescence and remobilization of carbon reserves in rice subjected to water stress during grain filling

Abscisic acid and cytokinins in the root exudates and leaves and their relationship to senescence and remobilization of carbon reserves in rice subjected to water stress during grain filling

Effects of Fully Open-Air [CO2] Elevation on Leaf Photosynthesis and Ultrastructure of Isatis indigotica Fort

Response of soybean yield components and allocation of dry matter to increased temperature and CO2 concentration

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