Abstract
Jasmonic acid (JA) and its various derivatives are lipid-derived signaling molecules which participate in the regulation of a number of plant processes, including growth, reproductive development, photosynthesis, and responses to biotic and abiotic stress factors. As compared to auxins, ABA, cytokinins, GAs, and ethylene, discovery of JA and elucidation of its roles in plants have been made in the relatively recent past. JA was first isolated from the fungus Lasiodiplodia theobromae as a plant growth inhibitor. Among green plants, the free acid (−JA) was first detected and identified as a growth inhibitor from the pericarp of Vicia faba (broad bean). The immature fruits of Vicia faba contain a mixture of (−) JA and its stereoisomer (+)-7-iso-jasmonic acid (+7-iso-JA) in 65–35% ratio (Fig. 21.1). Hydroxy-jasmon ester of chrysanthemic acid in pyrethrins (a class of insecticides), isolated from Chrysanthemum cinerariifolium (Pyrethrum), was the first JA metabolite discovered from plants. Active jasmonates, most importantly the methyl esters of jasmonates (JAMe), were initially detected as odorants from the flowers of Jasminum grandiflorum.
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Suggested Further Readings
Miersch O, Meyer A, Vorkefeld S, Sembdner G (1986) Occurrence of (+)-7-iso-jasmonic acid in Vicia faba L. and its biological activity. J Plant Growth Regul 5:91–100
Turner JG, Ellis C, Devoto A (2002) The jasmonate signal pathway. Plant Cell 14:S153–S164. https://doi.org/10.1105/tpc000679
Wasternack C (2015) How jasmonates earned their laurels: past and present. J Plant Growth Regul 34:761–794
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Multiple-Choice Questions
Multiple-Choice Questions
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1.
Among green plants, the first jasmonic acid was isolated from:
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(a)
Chrysanthemum cinerariifolium
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(b)
Jasminum grandiflorum
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(c)
Vicia faba
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(d)
Arabidopsis thaliana
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(a)
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2.
Organelle where JA biosynthesis occurs is plants are:
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(a)
Plastids and mitochondria
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(b)
Plastids and peroxisomes
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(c)
Mitochondria and chloroplasts
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(d)
Peroxisomes and mitochondria
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(a)
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3.
JA performs which of the following roles in plants:
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(a)
Senescing promoting factor
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(b)
Photomodulation of plant development
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(c)
Response to herbivores
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(d)
All of the above
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(a)
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4.
Which of the following is the receptor for JA-mediated signaling?
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(a)
COI1 (coronatine insensitive 1)
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(b)
JAZ (jasmonate zim domain)
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(c)
JAR (jasmonate acid resistance)
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(d)
MYC2
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(a)
Answers
1. a | 2. c | 3. d | 4. a |
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Bhatla, S.C. (2018). Jasmonic Acid. In: Plant Physiology, Development and Metabolism. Springer, Singapore. https://doi.org/10.1007/978-981-13-2023-1_21
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DOI: https://doi.org/10.1007/978-981-13-2023-1_21
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