Dan Maclean

• AgroFresh

Consumption of pomegranates has increased dramatically over the past decade, due in large part to the purported health benefits of the phytonutrients contained in the fruit. Pomegranate production originated in Persia, with other large centers located in Turkey, California, and China. Production in the SE for briefly investigated when a planting of...

Pomegranate ( Punica granatum L.) is a nonclimacteric fruit sold fresh as whole fruit or arils (fleshy seeds). It is also used for the production of juice, wine, and syrup. Pomegranate is popular due to its numerous health benefits. In the United States, it is grown primarily in California and other semi-arid regions, with Wonderful being the most...

Controlled atmosphere (CA) storage has been observed to prolong the shelf life of fresh produce. The objective of this study was to determine whether CA storage performed better than regular air (RA) storage in maintaining fruit quality of six pomegranate ( Punica granatum L.) cultivars grown in the state of Georgia. Pomegranate fruit produced in T...

Th e aim of this study was to determine the eff ect of salt stress on morphological and physiological changes of Brassica oleracea acephala group seedlings. Seedlings of kale cultivar Red Russian (RR) and collard Croatian population Konavle 2 (K2) were grown in a fl oating hydroponic system in Tift on, Georgia, USA. Seedlings were treated with seve...

Vidalia onions (Allium cepa) are a branded product of southeastern Georgia marketed under a federal marketing order. They are short-day, yellow onions with a Granex shape that are susceptible to a number of diseases postharvest, limiting the amount of time they can be marketed. Postharvest treatments and storage methods can help extend their market...

1. Herbivory often induces systemic plant responses that affect the host choice of subsequent herbivores, either deterring or attracting them, with implications for the performance of both herbivore and host plant. Combining measures of herbivore movement and consumption can efficiently provide insights into the induced plant responses that are mos...

The aim of this study was to determine the effect of enclosing kale leaves in PE-bags on leaf weight loss, water loss rate and chlorophyll index in two kale genotypes (cv. 'Red Russian and 'Konavle 2' which is a Croatian local population). The experiment was consisted of six replications with three leaves per treatment at room temperature (22 o C;...

Postharvest decay, caused by various fungal pathogens, is an important concern in commercial blueberry production, but current options for managing postharvest diseases are limited for this crop. Four plant essential oils (cinnamon oil, linalool, p-cymene, and peppermint leaf oil) and the plant oil-derived biofungicides Sporan (rosemary and winterg...

Anthocyanin content and composition and CIE 1976 (L*, a*, b*) color space (CIELAB) color coordinates were examined for the skin of 22 muscadine grape (Vitis rotundifolia Michx.) cultivars and Muscadinia Planch germplasm. Analysis of berry skin extracts by high-performance liquid chromatography (HPLC) determined that anthocyanin content varied from...

Northern highbush (NH) blueberry (Vaccinium corymbosum) and southern highbush (SH) blueberry (V. corymbosum hybrids) have fruit that vary in firmness. The SH fruit is mostly hand harvested for the fresh market. Hand harvesting is labor-intensive requiring more than 500 hours/acre. Rabbiteye blueberry (V. virgatum) tends to have firmer fruit skin th...

Pomegranate is a non-climacteric fruit consumed fresh as whole fruit or as arils and used for production of wine and syrup. Pomegranate production has been growing worldwide in response to increased popularity due to pomegranate health benefits. In the United States, the largest pomegranate production is in California. Pomegranate is a new crop in...

Mehra, L. K., MacLean, D. D., Savelle, A. T., and Scherm, H. 2013. Postharvest disease development on southern highbush blueberry fruit in relation to berry flesh type and harvest method. Plant Dis. 97:213-221. Postharvest decay, incited by various fungal pathogens, is a major concern in most blueberry production areas of the United States. Because...

Pomegranate juice is consumed widely for its possible health benefits. The aril juice from 15 pomegranate cultivars grown in Georgia were analysed for juice yield based on fresh weight (FW) and physico-chemical properties, using blender and mechanical press extraction. Blender had a higher juice yield (42.04% FW) compared to mechanical press (38.05...

Excessive irrigation in watermelon [Citrulus lanatus (Thunb.)] in many vegetable producing areas of the world is frequent due to inadequate irrigation scheduling, resulting in water waste and nutrient leaching. The objective of the study was to evaluate the effects of irrigation rates on soil moisture content, incidence of Phytophthora blight, and...

Field experiments were conducted from 2008 through 2010 near Lyons, GA, to develop integrated weed management systems for organic Vidalia® sweet onion (Allium cepa) production. Treatments were a factorial arrangement of summer solarization, cultivation with a tine weeder, and a clove oil herbicide. Plots were solarized with clear plastic mulch duri...

Pumpkins are difficult to produce for fall markets in the southeastern United States. Diseases, particularly aphid (Myzus persicae and Aphis spp.)-transmitted virus diseases, make fall pumpkin production difficult. Controlled-atmosphere (CA) storage may offer a method of overcoming this problem by using spring- or summer-produced pumpkins held in C...

Little is known of the postharvest quality and storage potential of locally grown pomegranate cultivars in Georgia, U.S.A. Seven cultivars were harvested at two maturity stages (early and late) and stored either in regular air (RA; 5 °C, 90% to 95% R.H.) or in controlled atmosphere (CA; 3% O2, 5% CO2, 5 °C, 90% to 95% R.H.) for three months. Fruit...

Before the 1960s, all blueberries, whether destined for the fresh or processed market, were harvested by hand. With the advent of machine harvesting, growers were able to increase harvest efficiency at a reduced cost per acre. However, the quality of machine harvested fruit has not been consistent enough to satisfy fresh market demands. The greates...

Palmer amaranth (Amaranthus palmeri), a broadleaf, summer annual, is a common and competitive weed of row crop production in the Midsouth and SE states. However, Palmer amaranth has developed resistance to four herbicide mechanisms of action, the most important being the EPSPS-inhibitors (glyphosate). Currently, glyphosate-resistant Palmer amaranth...

Vidalia onions are very susceptible to storage disorder botrytis neck rot (BNR) caused by fungal pathogen Botrytis alli. Postharvest storage methods are important to control the incidence of BNR. Controlled atmosphere (CA) storage and curing before storage can reduce the risk of BNR. Curing can be performed either in field or artificially using for...

With global demand for pomegranate (Punica granatum L.) on the rise, there is an interest by growers in the SE US in the fruit as a new commercially viable option. The interest is primarily related to the high phytonutrient content of the fruit. However, little is known of the postharvest quality and storage potential of the locally grown cultivars...

Postharvest temperature management and chlorine washes are the primary tools available to growers for maintaining quality and controlling fungal pathogens postharvest of Muscadine grape. However, latent infections from the field by fungal pathogens Glomerella cingulata and Greeneria uvicola results in the mycelial spread and sporolation during stor...

A postharvest 1-methylcyclopropene (1-MCP) treatment was evaluated for its ability to maintain firmness and delay the ripening of rabbiteye blueberries. Three cultivars, Austin, Brightwell, and Premier, were harvested by hand from the UGA Alapaha Blueberry Farm and treated overnight with 1 μLL -1 1-MCP as field heat was being removed [0 to 1 °C, 90...

Developing high levels of resistance to Phytophthora blight (Phytophthora capsici Leonian) of pepper (Capsicum annuum L.) is a goal of many pepper breeding programs. Genetic diversity and plant characteristics were evaluated on 21 pepper accessions previously identified as having high levels of Phytophthora root rot resistance. Accessions were eval...

Firmness is an important quality index for blueberries. It is the major factor that determines consumer acceptability, storability and resistance to injury and diseases during storage and fresh marketing. Blueberry cultivars vary in their firmness, with southern highbush cultivars usually softer than Rabbiteye blueberries. In this study, varietal a...

There is an increasing concern about sustainable use of water in vegetable production. Research efforts are intended to increase water and fertilizer use efficiency. Watermelon is often irrigated excessively resulting in water waste and nutrient leaching. The objective was to evaluate the effects of irrigation rates on plant growth and fruit yield...

Onion is the third-largest fresh vegetable crop in the U.S. As a critical link between the farm and the consumer, postharvest handling plays a vital role in the onion industry. The current sorting and storage system is largely based on human inspection and unable to confront challenges like the growing demand for high-quality products from consumer...

The total antioxidant capacity (TAC; nmoles of Trolox equivalents.g -1) and flavonoid content of 'McIntosh' (Malus × domestica) apple was determined using a modified total oxyradical scavenging capacity (TOSC) assay and by HPLC/DAD, respectively. 'McIntosh' fruit were harvested at an early (-6 d), optimal (0 d) and late (+6 d) commercial maturity a...

Onion is a major vegetable crop in the world. However, various plant diseases, including sour skin caused by Burkholderia cepacia, pose a great threat to the onion industry by reducing shelf-life and are responsible for significant postharvest losses in both conventional and controlled atmosphere (CA) storage. This study investigated a new sensing...

The ethylene antagonist 1-MCP was investigated for its potential impact on the transcription of two key flavonoid biosynthetic (phenylalanine ammonia-lyase, PAL, E.C. 4.3.1.5; and chalcone synthase, CHS, E.C. 2.3.1.74), flavonoid transport (glutathione S-transferase, GST, E.C. 2.5.1.18) and ethylene perception (ethylene response sensor 1, ERS1) tra...

The ethylene antagonist 1-methylcyclopropene (1-MCP) was investigated for its potential impact on the transcription of key flavonoid biosynthetic (PAL and CHS) and ethylene perception (ERS1) genes during the postharvest storage of pear ( Pyrus × communis L.). Optimally harvested red and green `d'Anjou' fruit were treated with 1 μL·L ⁻¹ 1-MCP for 24...

The impact of 1-methylcyclopropene (1-MCP) on the synthesis and retention of flavonoid compounds during storage and ripening of red Delicious (Malus x domestica Borkh.) apples was investigated. Numerous anthocyanins, flavonols, flavan-3-ols, and a hydroxycinnamic acid from three different fruit harvest maturities were monitored after a 120 day stor...

This study investigated the effects of exposure to waterborne perfluorooctane sulfonate (PFOS) on oxidative stress and reproductive endpoints in fish. Exposures utilized species commonly used in toxicological testing, including the fathead minnow (Pimephales promelas) and rainbow trout (Oncorhynchus mykiss), as well as relatively insensitive taxa s...

Glutathione S-transferase (GST) is a ubiquitous and constitutive enzyme that is involved in numerous cellular activities including the amelioration of oxidative stresses caused by the presence of xenobiotics and reactive oxygen species. In the present study, a glutathione S-transferase was extracted, purified, and partially characterized from two t...

This study investigates oxidative stress and bioindicators of reproductive function in wild white sucker (Catostomus commersoni) collected from environments receiving pulp and paper mill effluent discharges in northern Ontario. Samples were collected over an eight-year period adjacent to three pulp and paper mills using a variety of processing and...

The total oxyradical scavenging capacity (TOSC) assay of Winston et al. [Free Radical Biol. Med. 24 (1998) 480] was modified through the development and incorporation of a standard curve, yielding a relatively simple but reliable method to quantify the total water-soluble antioxidant capacity (TAC) of plant tissues. The basis of the TOSC assay is t...