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Plant Physiol Biochem

Title:		Foliar application of methyl jasmonate induced physio-hormonal changes in Pisum sativum under diverse temperature regimes
Author(s):		Shahzad R; Waqas M; Khan AL; Hamayun M; Kang SM; Lee IJ;
Address:		"School of Applied Biosciences, Kyungpook National University, Daegu, Republic of Korea. School of Applied Biosciences, Kyungpook National University, Daegu, Republic of Korea; Department of Agriculture Extension, Buner 19290, Pakistan. UoN Chair of Oman's Medicinal Plants & Marine Natural Products, University of Nizwa, 616 Nizwa, Oman. School of Applied Biosciences, Kyungpook National University, Daegu, Republic of Korea; Department of Botany, Abdul Wali Khan University Mardan, Pakistan. School of Applied Biosciences, Kyungpook National University, Daegu, Republic of Korea. Electronic address: ijlee@knu.ac.kr"
Journal Title:		Plant Physiol Biochem
Year:		2015
Volume:		20150830
Issue:
Page Number:		406 - 416
DOI:		10.1016/j.plaphy.2015.08.020
ISSN/ISBN:		1873-2690 (Electronic) 0981-9428 (Linking)
Abstract:		"Global climate change brings with it unwarranted shifts in both abiotic (heat stress, cold stress, wind, precipitation) and biotic (pathogens, pests) environmental factors, thus posing a threat to agricultural productivity across the world. In plants, lodging due to storms or herbivory causes wounding stress and consequently enhances endogenous jasmonates. In response, the plant growth is arrested as plant defense is prioritized. We pre-treated pea plants with elevated methyl jasmonate (MeJA) levels i.e. 50 muM, 100 muM and 200 muM under controlled growth chamber conditions. The pre-treated plants were then kept at 40 degrees C (heat stress--HS), 4 degrees C (cold stress--CS) and 20 degrees C (optimum/control temperature--OT) for 72 h. The effect of such treatments on plant growth attributes, photosynthesis, stomatal conductance, cell death rate, and regulation of endogenous hormones were observed. Elevated MeJA application hindered plant growth attributes under HS, CS and OT conditions. Moreover, elevated MeJA levels lowered the rate of photosynthesis and stomatal conductance, induced stomatal closure, caused higher cells mortality in leaves under HS, CS, and OT conditions. Endogenous ABA contents significantly declined in all MeJA treatments under HS and OT, but increased under CS conditions. Exogenous MeJA enhanced endogenous jasmonic acid contents of pea plants, but altered endogenous salicylic acid contents under varying temperatures. Current study shows that higher concentrations of exogenous MeJA strengthen plant defense mechanism by hindering plant growth under stress conditions"
Keywords:		"Acetates/*administration & dosage *Climate Change Cyclopentanes/*administration & dosage Oxylipins/*administration & dosage Peas/*physiology Plant Growth Regulators/*physiology *Plant Leaves Stress, Physiological Temperature Abiotic factors Biotic factors;"
Notes:		"MedlineShahzad, Raheem Waqas, Muhammad Khan, Abdul Latif Hamayun, Muhammad Kang, Sang-Mo Lee, In-Jung eng Research Support, Non-U.S. Gov't France 2015/09/18 Plant Physiol Biochem. 2015 Nov; 96:406-16. doi: 10.1016/j.plaphy.2015.08.020. Epub 2015 Aug 30"