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Salt stress-induced seedling growth inhibition coincides with differential distribution of serotonin and melatonin in sunflower seedling roots and cotyledons.
Physiol Plant. 2014 Dec; 152(4):714-28.PP

Abstract

Indoleamines regulate a variety of physiological functions during the growth, morphogenesis and stress-induced responses in plants. Present investigations report the effect of NaCl stress on endogenous serotonin and melatonin accumulation and their differential spatial distribution in sunflower (Helianthus annuus) seedling roots and cotyledons using HPLC and immunohistochemical techniques, respectively. Exogenous serotonin and melatonin treatments lead to variable effect on hypocotyl elongation and root growth under NaCl stress. NaCl stress for 48 h increases endogenous serotonin and melatonin content in roots and cotyledons, thus indicating their involvement in salt-induced long distance signaling from roots to cotyledons. Salt stress-induced accumulation of serotonin and melatonin exhibits differential distribution in the vascular bundles and cortex in the differentiating zones of the primary roots, suggesting their compartmentalization in the growing region of roots. Serotonin and melatonin accumulation in oil body rich cells of salt-treated seedling cotyledons correlates with longer retention of oil bodies in the cotyledons. Present investigations indicate the possible role of serotonin and melatonin in regulating root growth during salt stress in sunflower. Effect of exogenous serotonin and melatonin treatments (15 μM) on sunflower seedlings grown in the absence or presence of 120 mM NaCl substantiates their role on seedling growth. Auxin and serotonin biosynthesis are coupled to the common precursor tryptophan. Salt stress-induced root growth inhibition, thus pertains to partial impairment of auxin functions caused by increased serotonin biosynthesis. In seedling cotyledons, NaCl stress modulates the activity of N-acetylserotonin O-methyltransferase (HIOMT; EC 2.1.1.4), the enzyme responsible for melatonin biosynthesis from N-acetylserotonin.

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Publisher Full Text (DOI)

Authors+Show Affiliations

Mukherjee S
Laboratory of Plant Physiology and Biochemistry, Department of Botany, University of Delhi, Delhi, 110007, India.
David A
No affiliation info available
Yadav S
No affiliation info available
Baluška F
No affiliation info available
Bhatla SC
No affiliation info available

MeSH

CotyledonHelianthusHypocotylIndoleacetic AcidsMelatoninPlant Growth RegulatorsPlant RootsSeedlingsSerotoninSodium ChlorideStress, Physiological

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

24799301

Citation

Mukherjee, Soumya, et al. "Salt Stress-induced Seedling Growth Inhibition Coincides With Differential Distribution of Serotonin and Melatonin in Sunflower Seedling Roots and Cotyledons." Physiologia Plantarum, vol. 152, no. 4, 2014, pp. 714-28.
Mukherjee S, David A, Yadav S, et al. Salt stress-induced seedling growth inhibition coincides with differential distribution of serotonin and melatonin in sunflower seedling roots and cotyledons. Physiol Plant. 2014;152(4):714-28.
Mukherjee, S., David, A., Yadav, S., Baluška, F., & Bhatla, S. C. (2014). Salt stress-induced seedling growth inhibition coincides with differential distribution of serotonin and melatonin in sunflower seedling roots and cotyledons. Physiologia Plantarum, 152(4), 714-28. https://doi.org/10.1111/ppl.12218
Mukherjee S, et al. Salt Stress-induced Seedling Growth Inhibition Coincides With Differential Distribution of Serotonin and Melatonin in Sunflower Seedling Roots and Cotyledons. Physiol Plant. 2014;152(4):714-28. PubMed PMID: 24799301.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Salt stress-induced seedling growth inhibition coincides with differential distribution of serotonin and melatonin in sunflower seedling roots and cotyledons. AU - Mukherjee,Soumya, AU - David,Anisha, AU - Yadav,Sunita, AU - Baluška,František, AU - Bhatla,Satish Chander, Y1 - 2014/06/11/ PY - 2014/02/04/received PY - 2014/03/12/revised PY - 2014/03/24/accepted PY - 2014/5/7/entrez PY - 2014/5/7/pubmed PY - 2015/7/21/medline SP - 714 EP - 28 JF - Physiologia plantarum JO - Physiol Plant VL - 152 IS - 4 N2 - Indoleamines regulate a variety of physiological functions during the growth, morphogenesis and stress-induced responses in plants. Present investigations report the effect of NaCl stress on endogenous serotonin and melatonin accumulation and their differential spatial distribution in sunflower (Helianthus annuus) seedling roots and cotyledons using HPLC and immunohistochemical techniques, respectively. Exogenous serotonin and melatonin treatments lead to variable effect on hypocotyl elongation and root growth under NaCl stress. NaCl stress for 48 h increases endogenous serotonin and melatonin content in roots and cotyledons, thus indicating their involvement in salt-induced long distance signaling from roots to cotyledons. Salt stress-induced accumulation of serotonin and melatonin exhibits differential distribution in the vascular bundles and cortex in the differentiating zones of the primary roots, suggesting their compartmentalization in the growing region of roots. Serotonin and melatonin accumulation in oil body rich cells of salt-treated seedling cotyledons correlates with longer retention of oil bodies in the cotyledons. Present investigations indicate the possible role of serotonin and melatonin in regulating root growth during salt stress in sunflower. Effect of exogenous serotonin and melatonin treatments (15 μM) on sunflower seedlings grown in the absence or presence of 120 mM NaCl substantiates their role on seedling growth. Auxin and serotonin biosynthesis are coupled to the common precursor tryptophan. Salt stress-induced root growth inhibition, thus pertains to partial impairment of auxin functions caused by increased serotonin biosynthesis. In seedling cotyledons, NaCl stress modulates the activity of N-acetylserotonin O-methyltransferase (HIOMT; EC 2.1.1.4), the enzyme responsible for melatonin biosynthesis from N-acetylserotonin. SN - 1399-3054 UR - https://www.unboundmedicine.com/medline/citation/24799301/Salt_stress_induced_seedling_growth_inhibition_coincides_with_differential_distribution_of_serotonin_and_melatonin_in_sunflower_seedling_roots_and_cotyledons_ DB - PRIME DP - Unbound Medicine ER -