Department of Horticulture, Botany and Gardening, University of Lleida, 25198 Lleida, Spain.
J Sci Food Agric. 2013 Feb;93(3):619-25. doi: 10.1002/jsfa.5853. Epub 2012 Aug 30.
In some pear varieties like 'Conference', 1-methylcyclopropene (1-MCP) treatment often impairs the ripening process indefinitely and the pears remain 'evergreen'. To better understand this behaviour, the influence of the harvest date, orchard location and year on the effectiveness of 1-MCP treatment was investigated.
Pear softening was inhibited by 1-MCP treatment and the effectiveness of the treatment depended on harvest date, orchard location and year. Differences in the rate of softening in 1-MCP-treated pears depended mainly on the fruit physiological maturity at the moment of 1-MCP treatment. Accordingly, the combination of the Streif index and ethylene production at harvest appeared to be able to predict the evergreen behaviour. Treated pears with a low Streif index (<0.8) and high ethylene production at harvest (≥0.23 µL kg(-1) h(-1)) maintain significantly high firmness but did soften during shelf life, reaching acceptable eating quality.
Evergreen behaviour was mainly influenced by the initial fruit maturity and especially by the ability of the fruit to produce ethylene at the moment of treatment. More mature fruit were able to overcome the inhibition by 1-MCP, and the solution to prevent evergreen behaviour therefore lies in the adequate determination of harvest maturity.
在一些梨品种中，如“会议”，1-甲基环丙烯（1-MCP）处理常常无限期地损害成熟过程，使梨保持“常绿”。为了更好地理解这种行为，研究了收获日期、果园位置和年份对 1-MCP 处理效果的影响。
1-MCP 处理抑制了梨的软化，处理效果取决于收获日期、果园位置和年份。1-MCP 处理梨软化速度的差异主要取决于 1-MCP 处理时果实的生理成熟度。因此，收获时的条纹指数和乙烯生成量的组合似乎能够预测常绿行为。收获时条纹指数<0.8 和乙烯生成量高（≥0.23 µL kg(-1) h(-1)）的处理梨保持显著的高硬度，但在货架期内会软化，达到可接受的食用品质。
常绿行为主要受初始果实成熟度的影响，特别是受果实在处理时产生乙烯的能力的影响。更成熟的果实能够克服 1-MCP 的抑制作用，因此防止常绿行为的方法在于准确确定收获成熟度。
