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Heat-shock-induced Cross Adaptation To Heat, Chilling, Drought And Salt Stress In Maize Seedlings And Involvement Of H2O2
M. Gong, B. Chen, Zhong-Guang Li, L. Guo
Published 2001 · Biology
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Summary A heat-shock pretreatment at 42 °C for 4 h followed by a 4-h recovery significantly enhanced survival rates of seedlings from two varieties of maize that differ in stress resistance. The procedure mitigated electrolyte leakage of primary roots and alleviated vitality loss of coleoptiles under severe heat, chilling, drought and salt stress, indicating that heat-shock pretreatment can induce cross adaptation. The heat-shock pretreatment, that induced cross adaptation, also produced an endogenous H 2 O 2 peak in maize seedlings. Exogenous H 2 O 2 treatments simultaneously enhanced multi-resistance to heat, chilling, drought and salt stress, implying that H 2 O 2 may play a signalling role in triggering cross adaptation of maize seedlings to various stresses.
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