Relationship Between Ca2+-CaM and Ethylene-Induced PG Activity in Tomato Fruit

GU Cai-qin; XI Yu-fang; GUAN Jun-feng; LI Guang-min

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Relationship Between Ca2+-CaM and Ethylene-Induced PG Activity in Tomato Fruit

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Polygalacturonase (PG) was studied during ripening and senescence of postharvest tomatofruit at pink stage at low and normal temperature. The results showed that the PG activity increased, thendecreased during ripening and senescence of tomato. Low temperature inhibited but ethylene enhanced PGactivity. Ethylene also enhanced caimodulin content, which was dependent on Ca2+ concentration in cell.When EGTA(Ca2+ chelator), verapamil (Vp) and LaCl3 (Ca2+ channel blockers), trifluoperazine and chloro-promaize (two CaM antagonisms) were used to treat tomato fruit at green mature stage with ethylene, theycould reverse ethylene-induced increase in PG activity, but Vp, chloropromaize (CPZ), trifluoperazine(TFP) could not directly influence PG activity, which indirectly indicated that influx of Ca2+ from the ex-tracellular space including the cell wall via the Ca2+ channel localized in plasma membrane and CaM were re-quired for ethylene-induced PG activity increase and that ethylene signal transduction may be related to Ca2+- CaM messenger system.

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《农业科学学报（英文版）》 |2003年第10期|1151-1156|共6页
作者
GU Cai-qin; XI Yu-fang; GUAN Jun-feng; LI Guang-min;
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作者单位

Department of Food Science, Guizhou University, Guiyang 550025, P. R. China;

College of Bio-systems Engineering and Food Science, Zhejiang University, Hangzhou 310029, P. R. China;

Institute of Agro-ph ysic Plant Physiology and Biochemistry, Hebei Academy of Agriculture and Forestry Sciences, Shijiazhuang 050051, P. R. China;

Institute of Agro-ph ysic Plant Physiology and Biochemistry, Hebei Academy of Agriculture and Forestry Sciences, Shijiazhuang 050051, P. R. China;

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原文格式 PDF
正文语种 chi
中图分类茄果类;
关键词
Tomato fruit, Ethylene, PG, Ca2+-CaM messenger system;

机译：番茄果实;乙烯;PG;Ca2 + -CaM信使系统;

Relationship Between Ca2+-CaM and Ethylene-Induced PG Activity in Tomato Fruit

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