Huangguan pear (Pyrus bretschneideri Rehd cv. Huangguan) is a pear cultivar that rapidly developed in China. However, rapid postharvest browning appearing in fruit peel and core during storage and shelf life pose a ch...Huangguan pear (Pyrus bretschneideri Rehd cv. Huangguan) is a pear cultivar that rapidly developed in China. However, rapid postharvest browning appearing in fruit peel and core during storage and shelf life pose a challenge for their marketing. The potential for low temperature conditioning (LTC) treatment to inhibit peel browning and improve quality of Huangguan pears in storage and shelf life was investigated. Pears were treated at 8℃ - 9℃ for 1, 3, 6 and 9 d, respectively, physiological indexes, including peel and core browning, core breakdown, malondialdehyde (MDA) content and ethanol content were determined and quality in storage period and shelf life was evaluated in this paper. LTC treatment alleviated peel browning and core browning either in storage or shelf life remarkably;it also delayed the decline of firmness, total soluble solids and titratable acidity in storage to some extent, inhibited ethanol and MDA content both in storage and shelf life effectively and maintained juiciness and crispness of pear fruit in shelf life. These results showed that LTC can serve as an important tool for the regulation of Huangguan pears external and internal quality in storage and shelf life with economic benefits and LTC treatment for 6 d was the optimum condition in the present study.展开更多
Actinidia arguta is a type of kiwi fruit with a smooth glabrous shape,which provides high nutritional value,a sweet and sour taste,and excellent healthcare function.However,it is a typical climacteric fruit and decomp...Actinidia arguta is a type of kiwi fruit with a smooth glabrous shape,which provides high nutritional value,a sweet and sour taste,and excellent healthcare function.However,it is a typical climacteric fruit and decomposes quickly when stored.For delaying senescence,the effect of postharvest short-time partial dehydration(STPD)on the storage quality of A.arguta was investigated under dehydration rates of 2%,4%,and 6%coupled with storage at(2.0±0.5)℃,respectively.Results showed that appropriate dehydration treatment coupled with low temperature storage inhibited the pectinase activity and the decomposition of propectin,thus maintaining fruit firmness,reducing fruit decay rate,regulating the generation of abscisic acid delaying ethylene production,and decreasing the peak level of respiration rate.it also inhibited the reduction of total soluble solid,titratable acid,and vitamin C,maintains catalase and peroxidase activity.based on the present study,the 4%dehydration treatment was the most effective,which extended the storage period up to 60 days and reduced the decay rate to 33%.in conclusion,it was revealed that STPD could be an effective method for retarding the losses that occurred in the fruit quality of A.arguta during cold storage.展开更多
Crop performance is determined by the combined effects of the genotype of the crop and the environmental conditions of the production system. This study was undertaken to develop a dynamic model for simulating environ...Crop performance is determined by the combined effects of the genotype of the crop and the environmental conditions of the production system. This study was undertaken to develop a dynamic model for simulating environmental （temperature and solar radiation） and N supply effects on fiber fineness, maturity and micronaire. Three different experiments involving genotypes, sowing dates, and N fertilization rates were conducted to support model development and model evaluation. The growth and development duration of fiber fineness, maturity, and micronaire were scaled by using physiological development time of secondary wall synthesis （PDT SWSP ）, which was determined based on the constant ratio of SWSP/ BMP. PTP （product of relative thermal effectiveness （RTE） and photosynthetically active radiation （PAR）, MJ m-2） and subtending leaf N content per unit area （N A , g m-2） and critical subtending leaf N content per unit area （CN A , g m-2） of cotton boll were calculated or simulated to evaluate effects of temperature and radiation, and N supply. Besides, the interactions among temperature, radiation and N supply were also explained by piecewise function. The overall performance of the model was calibrated and validated with independent data sets from three field experiments with two sowing dates, three or five flowering dates and three or four N fertilization rates for three subsequent years （2005, 2007, and 2009） at three ecological locations. The average RMSE and RE for fiber fineness, maturity, and micronaire predictions were 372 m g-1 and 5.0%, 0.11 m g-1 and 11.4%, 0.3 m g-1 and 12.3%, respectively, indicating a good fit between the simulated and observed data. It appears that the model can give a reliable prediction for fiber fineness, maturity and micronaire formation under various growing conditions.展开更多
文摘Huangguan pear (Pyrus bretschneideri Rehd cv. Huangguan) is a pear cultivar that rapidly developed in China. However, rapid postharvest browning appearing in fruit peel and core during storage and shelf life pose a challenge for their marketing. The potential for low temperature conditioning (LTC) treatment to inhibit peel browning and improve quality of Huangguan pears in storage and shelf life was investigated. Pears were treated at 8℃ - 9℃ for 1, 3, 6 and 9 d, respectively, physiological indexes, including peel and core browning, core breakdown, malondialdehyde (MDA) content and ethanol content were determined and quality in storage period and shelf life was evaluated in this paper. LTC treatment alleviated peel browning and core browning either in storage or shelf life remarkably;it also delayed the decline of firmness, total soluble solids and titratable acidity in storage to some extent, inhibited ethanol and MDA content both in storage and shelf life effectively and maintained juiciness and crispness of pear fruit in shelf life. These results showed that LTC can serve as an important tool for the regulation of Huangguan pears external and internal quality in storage and shelf life with economic benefits and LTC treatment for 6 d was the optimum condition in the present study.
基金supported by Liaoning Provincial Central Guiding Local Science and Technology Development Fund Project(2023JH6/100100003)Shenyang Science and Technology Plan Seed industry innovation Project(22-318-2-11).
文摘Actinidia arguta is a type of kiwi fruit with a smooth glabrous shape,which provides high nutritional value,a sweet and sour taste,and excellent healthcare function.However,it is a typical climacteric fruit and decomposes quickly when stored.For delaying senescence,the effect of postharvest short-time partial dehydration(STPD)on the storage quality of A.arguta was investigated under dehydration rates of 2%,4%,and 6%coupled with storage at(2.0±0.5)℃,respectively.Results showed that appropriate dehydration treatment coupled with low temperature storage inhibited the pectinase activity and the decomposition of propectin,thus maintaining fruit firmness,reducing fruit decay rate,regulating the generation of abscisic acid delaying ethylene production,and decreasing the peak level of respiration rate.it also inhibited the reduction of total soluble solid,titratable acid,and vitamin C,maintains catalase and peroxidase activity.based on the present study,the 4%dehydration treatment was the most effective,which extended the storage period up to 60 days and reduced the decay rate to 33%.in conclusion,it was revealed that STPD could be an effective method for retarding the losses that occurred in the fruit quality of A.arguta during cold storage.
基金funded by the National Natural Science Foundation of China (30771277 and 30771279)
文摘Crop performance is determined by the combined effects of the genotype of the crop and the environmental conditions of the production system. This study was undertaken to develop a dynamic model for simulating environmental （temperature and solar radiation） and N supply effects on fiber fineness, maturity and micronaire. Three different experiments involving genotypes, sowing dates, and N fertilization rates were conducted to support model development and model evaluation. The growth and development duration of fiber fineness, maturity, and micronaire were scaled by using physiological development time of secondary wall synthesis （PDT SWSP ）, which was determined based on the constant ratio of SWSP/ BMP. PTP （product of relative thermal effectiveness （RTE） and photosynthetically active radiation （PAR）, MJ m-2） and subtending leaf N content per unit area （N A , g m-2） and critical subtending leaf N content per unit area （CN A , g m-2） of cotton boll were calculated or simulated to evaluate effects of temperature and radiation, and N supply. Besides, the interactions among temperature, radiation and N supply were also explained by piecewise function. The overall performance of the model was calibrated and validated with independent data sets from three field experiments with two sowing dates, three or five flowering dates and three or four N fertilization rates for three subsequent years （2005, 2007, and 2009） at three ecological locations. The average RMSE and RE for fiber fineness, maturity, and micronaire predictions were 372 m g-1 and 5.0%, 0.11 m g-1 and 11.4%, 0.3 m g-1 and 12.3%, respectively, indicating a good fit between the simulated and observed data. It appears that the model can give a reliable prediction for fiber fineness, maturity and micronaire formation under various growing conditions.
