Influence of Abscisic acid on K&lt;sup&gt;+&lt;/sup&gt; absorption by leaf discs ofSolanum tuberosum

Suleiman, Sausan; Hourmant, Annick; Penot, Michel

doi:10.1007/bf02873788

Cited by 6 publications

(2 citation statements)

References 27 publications

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“…Potato tuberization is characterized by a decrease in endogenous ABA levels during stolon and tuber development in vitro (Xu et al 1998). Can we then consider that tuberization under high K + nutrition is associated with an increase in endogenous ABA levels because ABA is related to stimulation of both saturable and linear components of K + uptake and transport in potato (Suleiman et al 1991;Reddahi et al 1999)? Further studies are required to explore these possibilities.…”

Section: Discussionmentioning

confidence: 99%

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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Section: Discussionmentioning

confidence: 99%

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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“…Aucune interprttation simple ne peut 6tre donnte quant au mtcanisme d'action des hormones dont on sait que l'une des manifestations essentielles peut se situer au niveau du fonctionnement des enzymes: ATPases (Suleiman et al 1991), invertase (Morris et Arthur 1985) ou UDPG-pyrophosphorylase (Mares et al 1985) ou saccharo-synthttase (Sowokinos et Varns 1992) dans le cas de la pomme de terre. Une 6tude comparte de raction des principales hormones, ABA, CK et GA, est donc entreprise dans ce travail.…”

Section: Introductionunclassified

Absorption of sucrose by tissues of adult tubers of potato(Solatium tuberosum L.). modalities and influence of phytohormones

Penot¹,

Hourmant²,

Reddahi³

1993

Biologia plant.

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Influence of Abscisic Acid on K<sup>+</sup> absorption by leaf tissues ofSolanum tuberosum L. (cv. Bintje). Relation with calcium fluxes and with calmodulin

Penot¹,

Hourmant²,

Suleiman³

et al. 1991

Biologia plant.

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Previous results with potato leaf tissues revealed that a treatment with ABA (10 -4 M) induced an increase of K + uptake (Suleiman et al., 1990a).In this study, we investigate the relationship between increased K § uptake, Ca 2 § fluxes and calmodulin by treating potato leaf discs with Ca 2 § channel blockers (La 3 § verapamil and nifedipine) and with calmodulin inhibitors (chlorpromazine, WT: N-(6-aminohexyl)-5-chloro-l-naphthalene-sulfonamide, and compound 4880).We found: a) all these inhibitors decreased K § uptake in the same ratio in tissues treated or not with ABA; b) a synergistic effect between ABA and the Ca 2 § ionophore A 23187 on K + uptake.The results suggest that the hormone may act on K + uptake like a Ca 2+ agonist, in accord with HUDDART's hypothesis.In a previous pa~per we reported that treatment of foliar tissue of Solanum tuberosum with abscisic acid (ABA) stimulated K § uptake (Suleiman et al. 1990b). By using metabolic inhibitors, it appeared that stimulation was due both to an increase in active and passive components. Elliott (1986) has suggested that in some circumstances hormonal action could involve calmodulin (CAM) and a participation of second messengers especially Ca 2+.Recently, we proposed (Suleiman et al., 1988) a scheme (Fig. 1) based upon data from Elliott (1986), Rincon and Hanson (1986) and Roux et al. (1986) to explain the positive effect of ABA on K § uptake.According to this hypothesis, ABA acts like a Ca 2 § agonist (Huddart et al. 1986) ; a change in cytosolic free [Ca 2 § will activate diverse protein-kinases, (Mg 2 § + Ca 2 §

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Influence of Abscisic acid on K<sup>+</sup> absorption by leaf discs ofSolanum tuberosum

Cited by 6 publications

References 27 publications

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

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

Absorption of sucrose by tissues of adult tubers of potato(Solatium tuberosum L.). modalities and influence of phytohormones

Influence of Abscisic Acid on K<sup>+</sup> absorption by leaf tissues ofSolanum tuberosum L. (cv. Bintje). Relation with calcium fluxes and with calmodulin

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