Influence of Ageing and Abscisic Acid on Potassium Uptake by Potato Tuber Tissues

Reddahi, A.; Es-Sgaouri, A.; R'Kiek, C.

doi:10.1023/a:1002623300097

Cited by 3 publications

(1 citation statement)

References 37 publications

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“…All these results suggest that the uptake and accumulation of K are at least in part passive and directly related to the uptake of water and that the allocation to different organs is in part determined by each type of forest. Apart from depending on active uptake (Maathuis & Sanders ; Reddhai, Es‐Sgaouri & R'kiek ; Álvarez‐Pizarro et al . ), the uptake of K has also been observed to be directly related to the passive uptake of water linked to transpiration flux (Ruhl ; Trivedi & Erdei ; Silberbush, Ben‐Asher & Ephrath ).…”

Section: Discussionmentioning

confidence: 99%

Stoichiometry of potassium is largely determined by water availability and growth in Catalonian forests

et al. 2012

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Summary The study of the relationships between organisms and environmental elemental stoichiometry and ecosystem structure and function has recently received increasing attention. Some elements, however, have been less studied or have even been neglected. One of these elements is K, despite its critical importance in the water economy of plants. We hypothesized that K concentrations and especially K contents (concentrations × biomass), their stoichiometries with respect to C, N, and P contents, and their relative allocations to foliar and woody compartments would be linked to climatic gradients in the availability of water, forest type and growth. We tested this hypothesis by analysing the data set of the Catalan Forest Inventory. Evergreens, the type of tree with the slowest growth, showed the highest K contents, especially in wood, and the lowest plasticity to change the stoichiometry of K within and between foliar and woody biomasses along climatic gradients. The allocation of K to leaves in relation to the allocation of C, N and P increased with mean annual precipitation (MAP) and was concomitant with decreases in the allocation of K to wood in relation to the allocation of C, N and P (higher K:CL/W, K:NL/W and K:PL/W). In summer, the driest period, higher K:C, K:N and K:P content ratios in leaves were accompanied by lower K:C, K:N and K:P content ratios in wood, mainly in the species at the driest sites. Higher K:C and K:N content ratios in leaves and above‐ground biomass in all forest types, and higher K:CL/W and K:NL/W in conifers and deciduous trees were related to higher growth. K contents of leaves were better correlated with tree growth than were K concentrations of leaves in all forest types. These results show that the stoichiometry of K is strongly related to the availability of water and that the uptake of K is more related to the uptake of water than the uptake of N and P. Stoichiometric differences involving K are related to both the response of plants to drought and to plant growth. K thus plays a key role, together with N and P, in the response of plants to climatic gradients for improving the capacities for growth and adaptation to water stress along environmental gradients and through time (seasons). Moreover, these results show that the differences in stoichiometric composition and plasticity involving K contents can underlie the long‐term adaptation of trees to different ecological styles of life. K should thus be considered in ecological stoichiometric studies of terrestrial plants.

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Section: Discussionmentioning

confidence: 99%

Stoichiometry of potassium is largely determined by water availability and growth in Catalonian forests

et al. 2012

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High K+ does not affect potato (Solanum tuberosum L.) tuber induction, but represses its development in vitro

Sarkar

Pandey

Sharma

2010

In Vitro Cell.Dev.Biol.-Plant

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The role of K + in potato (Solanum tuberosum L.) tuberization, based on the effects of K fertilizer and soil exchangeable K + , appears to be mostly contradictory. Here, we provide evidence that K + at high concentrations is detrimental to tuber development in vitro once induction has taken place. An experimental system using in vitrocultured single-node cuttings showed that K + at ≥30.0 mM significantly reduced tuber fresh mass concomitant with a corresponding decline in starch content. However, high K + did not affect tuber induction in terms of number of tubers developed per cutting. High K + -induced inhibitory effect on tuber development was attributed to a reduced rate of assimilate partitioning. 86 Rb(K) transport to stolons, and tubers that acted as strong sinks in vitro were proportional to exogenous K + levels; however, 86 Rb accumulation and K + deposition were markedly reduced in tubers as compared with that in stolons, especially at higher K + levels. The results indicated a diminishing sink strength developed by tubers with increasing K nutrition. Highly significant negative correlations between 86 Rb accumulation/ K + deposition in both the sink organs and tuber fresh mass reinforced the inhibitory effect of high K + on tuber development. The rate of tuber K removal in vitro was similar to that of crop K removal reported in vivo, suggesting highly conserved K uptake and transport mechanisms during tuberization process. The results have been discussed in the context of possible effects of high K + on impairing sucrose uptake and metabolism.

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Stimulation of Potassium Uptake by Abscisic Acid in Potato Tuber Tissues. Relation with H+ and Ca2+ Fluxes

Reddahi¹,

Es-Sgaouri²,

Mourabit³

et al. 1999

Biologia plant.

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Influence of Ageing and Abscisic Acid on Potassium Uptake by Potato Tuber Tissues

Cited by 3 publications

References 37 publications

Stoichiometry of potassium is largely determined by water availability and growth in Catalonian forests

Stoichiometry of potassium is largely determined by water availability and growth in Catalonian forests

High K+ does not affect potato (Solanum tuberosum L.) tuber induction, but represses its development in vitro

Stimulation of Potassium Uptake by Abscisic Acid in Potato Tuber Tissues. Relation with H+ and Ca2+ Fluxes

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