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| Adjusting and Controlling Effect of Calcium on Resistance to Tomato Gray Mold and Defensive Enzymes Activity Induced by Methyl Jasmonate |
| YU Chao-ge1，2，LI Tian-lai1*，ZHANG Kang-kang1，LIU Zhi-heng 2，LI Lin-lin1，ZHOU Di3 |
| 1College of Horticulture，Shenyang Agricultural University，Key Laboratory of Protected Horticulture，Ministry of Education，Shenyang 110161，Liaoning，China|2College of Plant Protection，Shenyang Agricultural University，Shenyang 110161，Liaoning，China|3Library，Shenyang Agricultural University，Shenyang 110161，Liaoning，China |
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Abstract Taking tomato（Lycopersicon esculentum Mill.）variety‘L402’seedling as material, we investigated the effect and physiological mechanism of calcium to methyl jasmonate（MeJA）inducing tomato resistance to gray mold after treated the tomato leaves with MeJA，Ca2+ or inhibitor of Ca2+．The results showed that：（1）Resistance to tomato gray mold was improved significantly after the plant treated with MeJA．Induced resistance was farther enhanced by Ca2+ but restrained badly by chelator as EGTA or the plasmalemma Ca2+ channel blocker as LaCl3．（2）Activities of PAL，PPO and POD also rose after the plant treated with MeJA．The response was generally promoted by exterior Ca2+ and suppressed by the inhibitor of Ca2+ such as EGTA and LaCl3．（3）However，activities of CAT and SOD induced by MeJA were not regulated by Ca2+ or inhibitor of Ca2+．Consequently，modulating of calcium on the induced resistance to tomato gray mold by MeJA may have relations with activities of defensive enzymes such as PAL，PPO and POD in tomato leaves.
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Received: 20 June 2012
Published: 30 July 2012
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