Journal of Food, Agriculture and Environment
Vol 10,
Issue 3&4,2012
Online ISSN: 1459-0263
Print ISSN: 1459-0255
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Possible involvement of H2O2 induced Ca2+ efflux in the dormancy-breaking effect of hydrogen cyanamide and high temperature in nectarine floral buds
Author(s):
Yue Tan 1,
Ling Li 1, Chen Shan Xu 2, Xiu De Chen 1, Dong Mei Li 1, Dong Sheng Gao 1Recieved Date: 2012-06-08, Accepted Date: 2012-10-03
Abstract:Dormancy is the main obstacle for the commercial production of temperate fruits in warm-winter regions and the protected fruit production now developing rapidly in China. Hydrogen cyanamide and high temperature are effective in the breakage of dormancy in nectarine and other deciduous trees, however, the details of mechanism are still unknown. Enhancements in the levels of H2O2 and elimination of high cytosolic Ca2+ are important processes in the dormancy release mechanism. Here, we reported that both hydrogen cyanamide and high temperature induced the increase of H2O2 in dormant nectarine floral buds. Exogenous application of H2O2 caused a shift of Ca2+ influx towards an efflux in dormant nectarine floral primordia. The observation indicated the possible involvement of H2O2 induced cytosolic Ca2+ elimination in dormancy release mechanism and provided new visions on H2O2/Ca2+ cooperation. Further experiments showed that the H2O2 induced Ca2+ flux shift could be inhibited by the pretreatment of LaCl3 (inhibitor of Ca2+-permeable channels) but not erythrosin B (inhibitor of Ca2+-ATPase), suggesting the key role of Ca2+-permeable channels in the process. In addition, H2O2 application also influenced the transportation of H+ and Mg2+, which was associated with cell cycle regulations and could also be involved in dormancy release mechanism. No significant transporting changes of Na+ and K+ were detected following the application of H2O2.
Keywords:Nectarine,
floral buds, hydrogen peroxide, calcium, dormancyJournal: Journal of Food, Agriculture and Environment
Year: 2012
Volume: 10
Issue: 3&4
Category: Agriculture
Pages: 846-849
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