文献类型： 外文期刊

作者： Dong, Yu ¹ ; Zhi, Huanhuan ¹ ;

作者机构： 1.Qinghai Univ, Qinghai Acad Agr & Forestry Sci, 253 Ningda Rd, Xining 810016, Qinghai, Peoples R China

2.Oregon State Univ, Midcolumbia Agr Res & Extens Ctr, Dept Hort, 3005 Expt Stn Dr, Hood River, OR 97031 USA

关键词： Pyrus communis L.; Harpin beta protein; Application concentration; Application frequency and timing; Quality; Physiological disorder

期刊名称：POSTHARVEST BIOLOGY AND TECHNOLOGY （ 影响因子：6.751； 五年影响因子：7.001 ）

ISSN： 0925-5214

年卷期： 2022 年 191 卷

页码：

收录情况： SCI

摘要： The primary purpose of this study was to determine the effects of pre-harvest application concentration, frequency, and timing of harpin beta protein on quality attributes, nutrient uptake, and susceptibility to physiological disorders in 'Bartlett' and 'd' Anjou' pears. Split applications of 1.5 mg L-1 harpin at 30 + 7 d before harvest (30 +7 DBH) resulted in higher fruit firmness (FF) and peel chlorophyll content with a lower soluble solids content in 'Bartlett' pears at harvest compared to the control, but not in 'd' Anjou' pears. This treatment reduced the ethylene production rate (EPR) and FF loss of 'Bartlett' pears at the initial 3 months of regular-air (RA) storage. Extending the storage periods to 5 months, a high EPR with low incidence of senescent disorders was observed after storage and during ripening, respectively. Increasing the application concentration of harpin from 1.5 to 10 mg L-1 did not further affect the quality of 'Bartlett' pears. Early application of harpin between full bloom (FB) and 2 months after full bloom (2 MAFB) repeated up to 3 times resulted in high FF and green color of 'd'Anjou' pears at harvest, but not in 'Bartlett' pears. A single application of harpin 2 MAFB to 'd'Anjou' trees provided the greatest reduction the losses in FF and green color, extend storage life, and suppress the development of superficial scald. No difference was observed in nutrient uptake in either cultivar when harpin was sprayed at 30 + 7 DBH. Spraying harpin once at 1 MAFB, once at 2 MAFB, and three times at FB+ 1 MAFB+ 2 MAFB resulted in low-boron 'Bartlett' and low-calcium 'd'Anjou' pears. Fortunately, harpin-treated pears with lower B or Ca levels did not result the quality deterioration and development of disorders. In conclusion, harpin has the potential to improve fruit quality, but recommended timing varies by cultivar: spraying 1.5 mg L-1 harpin at 2 MAFB improved the quality of 'd'Anjou' pears, whereas quality of 'Bartlett' pears was improved by applying harpin at 30 + 7 DBH.