caa a22 4500 445840439 CHVBK 20180317145342.0 cr unu---uuuuu 170323e20110701xx s 000 0 eng 10.1007/s00709-010-0218-5 doi (NATIONALLICENCE)springer-10.1007/s00709-010-0218-5 Methyl jasmonate counteracts boron toxicity by preventing oxidative stress and regulating antioxidant enzyme activities and artemisinin biosynthesis in Artemisia annua L [Elektronische Daten] [Tariq Aftab, M. Khan, Mohd. Idrees, M. Naeem, Moinuddin,, Nadeem Hashmi] Boron is an essential plant micronutrient, but it is phytotoxic if present in excessive amounts in soil for certain plants such as Artemisia annua L. that contains artemisinin (an important antimalarial drug) in its areal parts. Artemisinin is a sesquiterpene lactone with an endoperoxide bridge. It is quite expensive compound because the only commercial source available is A. annua and the compound present in the plant is in very low concentration. Since A. annua is a major source of the antimalarial drug and B stress is a deadly threat to its cultivation, the present research was conducted to determine whether the exogenous application of methyl jasmonate (MeJA) could combat the ill effects of excessive B present in the soil. According to the results obtained, the B toxicity induced oxidative stress and reduced the stem height as well as fresh and dry masses of the plant remarkably. The excessive amounts of soil B also lowered the net photosynthetic rate, stomatal conductance, internal CO2 concentration and total chlorophyll content in the leaves. In contrast, the foliar application of MeJA enhanced the growth and photosynthetic efficiency both in the stressed and non-stressed plants. The excessive B levels also increased the activities of antioxidant enzymes, such as catalase, peroxidase and superoxide dismutase. Endogenous H2O2 and O 2 − levels were also high in the stressed plants. However, the MeJA application to the stressed plants reduced the amount of lipid peroxidation and stimulated the synthesis of antioxidant enzymes, enhancing the content and yield of artemisinin as well. Thus, it was concluded that MeJA might be utilized in mitigating the B toxicity and improving the content and yield of artemisinin in A. annua plant. Springer-Verlag, 2010 Artemisia annua L nationallicence Artemisinin nationallicence Boron nationallicence Methyl jasmonate (MeJA) nationallicence Reactive oxygen species (ROS) nationallicence Aftab Tariq Plant Physiology Section, Department of Botany, Aligarh Muslim University, 202 002, Aligarh, Uttar Pradesh, India aut Khan M. Plant Physiology Section, Department of Botany, Aligarh Muslim University, 202 002, Aligarh, Uttar Pradesh, India aut Idrees Mohd Plant Physiology Section, Department of Botany, Aligarh Muslim University, 202 002, Aligarh, Uttar Pradesh, India aut Naeem M. Plant Physiology Section, Department of Botany, Aligarh Muslim University, 202 002, Aligarh, Uttar Pradesh, India aut Moinuddin, Plant Physiology Section, Department of Botany, Aligarh Muslim University, 202 002, Aligarh, Uttar Pradesh, India aut Hashmi Nadeem Plant Physiology Section, Department of Botany, Aligarh Muslim University, 202 002, Aligarh, Uttar Pradesh, India aut Protoplasma Springer Vienna 248/3(2011-07-01), 601-612 0033-183X 248:3<601 2011 248 709 https://doi.org/10.1007/s00709-010-0218-5 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00709-010-0218-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Aftab Tariq Plant Physiology Section, Department of Botany, Aligarh Muslim University, 202 002, Aligarh, Uttar Pradesh, India aut NATIONALLICENCE 700 1- Khan M. Plant Physiology Section, Department of Botany, Aligarh Muslim University, 202 002, Aligarh, Uttar Pradesh, India aut NATIONALLICENCE 700 1- Idrees Mohd Plant Physiology Section, Department of Botany, Aligarh Muslim University, 202 002, Aligarh, Uttar Pradesh, India aut NATIONALLICENCE 700 1- Naeem M. Plant Physiology Section, Department of Botany, Aligarh Muslim University, 202 002, Aligarh, Uttar Pradesh, India aut NATIONALLICENCE 700 1- Moinuddin Plant Physiology Section, Department of Botany, Aligarh Muslim University, 202 002, Aligarh, Uttar Pradesh, India aut NATIONALLICENCE 700 1- Hashmi Nadeem Plant Physiology Section, Department of Botany, Aligarh Muslim University, 202 002, Aligarh, Uttar Pradesh, India aut NATIONALLICENCE 773 0- Protoplasma Springer Vienna 248/3(2011-07-01), 601-612 0033-183X 248:3<601 2011 248 709 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer