'USDA Red' Spinach
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HORTSCIENCE 54(11):2070–2072. 2019. https://doi.org/10.21273/HORTSCI14308-19 cultivars. It has a monoecious flowering habit and produces smooth seeds. Compared with other varieties, it has moderate resistance to ‘USDA Red’ Spinach bolting. Beiquan Mou Field evaluations. ‘USDA Red’ was planted in a field at the experiment station U.S. Department of Agriculture (USDA), Agricultural Research Service, of the USDA in Aug. 2015, Aug. 2016, Aug. 1636 East Alisal Street, Salinas, CA 93905 2017, and Aug. 2018 in Salinas, CA, to Additional index words. antioxidant capacity, betacyanin, nutritional value, red leaf, Spinacia evaluate its horticultural and nutritional traits. A green-leaf spinach cultivar, Polar oleracea Bear (Rijk Zwaan, De Lier, Holland), and two red-veined cultivars, Bordeaux and Red Spinach has always been known as a green that attack proteins, lipids, and DNA, conse- Deer (Rijk Zwaan), were included in the leafy vegetable. Although there are some quently leading to damage and dysfunction of trials. The experiment design was a random- plants called ‘‘red spinach,’’ they are usually enzymes, cell membranes, and genetic mate- ized complete block with four replications. red-leaf amaranth (Amaranthus spp.) or other rial (Stintzing and Carle, 2004). Betacyanin Each plot consisted of 50 plants of a geno- species (e.g., Blitum rubrum), not true spinach has been shown to significantly reduce oxi- type, with 30 cm between plants and 35 cm (Spinacia oleracea). There are currently some dative stress in patients and may help in between rows on 1-m wide double-row beds. ‘‘red’’ true spinach cultivars on the market, but preventing chronic pathologies, inflamma- Ten plants were randomly selected from each the red coloration is limited to the veins of the tion, and cancer (Stintzing and Carle, 2004; plot to measure petiole length, spread (di- leaves. In this article, the development of Sumaya-Martinez et al., 2011). Therefore, ameter of the plant), (fully developed) leaf ‘USDA Red’, the world’s first true spinach betacyanin adds another benefit to a plant number, plant height (from ground to the tip variety with red color on the surface of the already loaded with phytonutrients, making of the tallest leaf), and plant weight (exclud- leaves, is described. spinach a true ‘‘super food.’’ ing roots) for each plant (not all these traits Spinach consumption (and production) in Red spinach can be used as baby or were evaluated during each trial). Per-plant the United States decreased from 2.3 pounds ‘‘teen’’ leaf in salad bags (alone or in values were averaged and an analysis was per person to 1.6 pounds during the year mixtures with other vegetables), bunched following an Escherichia coli outbreak in products, and spring mix for fresh-market 2006, and it has not fully recovered (NASS, consumption, or as processed products (fro- 2015, 2018). Red spinach will bring some zen or canned). The red color in spring mix is excitement to the spinach market and help now provided by red lettuce, radicchio, or attract consumers. Furthermore, it may help chard, and red spinach will give processors increase the consumption of spinach and aid another choice. Ultimately, the consumers in fighting the obesity epidemic. The obesity will have access to new vegetable products to rate has climbed to 39.6% of American benefit their health and well-being. adults, 42.8% among those aged 40–59 (Hales et al., 2017), costing more than $147 Origin billion per year for the treatment of illnesses related to obesity (Finkelstein et al., 2009). ‘USDA Red’ was derived from the self- Unhealthy diets are a direct cause of being pollination (selfing) of a single monoecious overweight, but efforts by public health plant from a red-veined spinach culti- organizations and the produce industry to var Bordeaux (Johnny’s Selected Seeds, increase the consumption of fruits and vege- Winslow, ME). Progeny plants were selected tables have had limited success due to dietary in the field for red color and selfed three more habits and economic or cultural reasons. generations. Twenty-three plants were se- Enhanced nutritional levels of vegetables lected from the selfed progeny and allowed Fig. 1. A plant of spinach variety ‘USDA Red’ in would improve the nutrient intake without to randomly intercross in an isolation cham- the field with the purple–red color developing requiring an increase in consumption. Spin- ber. The resulting progeny plants were from the lower part of the leaves. ach is one of the most desirable leafy vege- selected in the field for red color and inter- b tables due to its high content of -carotene pollinated through four additional cycles of (provitamin A), lutein, folate, vitamin C, phenotypic recurrent selection. The resulting calcium, iron, phosphorus, and potassium. seeds from the population were bulk- The red color of ‘USDA Red’ comes from harvested and designated ‘USDA Red’. betacyanin, which exists in the family of Amaranthaceae, instead of the more common anthocyanin (Ali et al., 2009). Betacyanin is a Description potent antioxidant that can scavenge exces- sive reactive oxygen species and free radicals Morphological characters. ‘USDA Red’ is a semi-flat type of spinach with a medium growth rate and semi-erect leaves. Its leaves are spade-shaped with round-pointed tips and Received for publication 20 June 2019. Accepted purple-red veins and petioles. There may be for publication 30 July 2019. one or two indents on both sides of the leaf I thank Chenping Xu, Emi Kuroiwa, and Sharon blade. As the dark green leaves grow, purple– Benzen for technical assistance. red color (59A, Red–Purple Group, the Royal Mention of a trade name, proprietary product, or Horticultural Society (RHS) Color Chart, vendor does not constitute an endorsement, guar- antee, or warranty by the USDA and does not imply London, UK) develops from the lower part its approval to the exclusion of other products or of the leaves (Fig. 1) and may cover the entire vendors that may be suitable. upper (adaxial) surface (Fig. 2). The lower Fig. 2. A plant of spinach variety ‘USDA Red’ in B.M. is the corresponding author. E-mail: bei- leaf (abaxial) surface remains green. Its taste the field with purple–red color covering the [email protected]. is mild and bland, similar to other spinach entire upper leaf surface. 2070 HORTSCIENCE VOL. 54(11) NOVEMBER 2019 Table 1. Horticultural trait means of ‘USDA Red’, ‘Bordeaux’ (red-veined cultivar), ‘Red Deer’ (red-veined cultivar), and ‘Polar Bear’ (standard green-leaf cultivar) grown in field trials conducted in Salinas, CA, in 2015–18. Petiole length (cm) Plant spread (cm) Leaf number Plant ht (cm) Plant wt (g) Genotype 2018 2017 2018 2015 2016 2017 2018 2015 2017 2018 2015 2016 2017 2018 USDA Red 8.7 bz 15.3 c 35.2 c 23.4 a 16.5 a 11.2 b 21.4 b 13.6 a 8.9 b 18.6 c 57.7 b 27.4 a 21.0 a 72.0 b Bordeaux 11.4 a 18.1 b 40.6 b 24.8 a 15.8 a 14.0 a 25.1 a 15.3 a 11.7 a 22.7 ab 45.6 b 11.9 b 12.5 b 69.1 b Red Deer 10.5 a 21.0 a 48.2 a — 16.8 a 13.9 a 19.8 b — 11.6 a 25.0 a — 29.1 a 28.7 a 131.5 a Polar Bear 8.2 b 20.8 a 41.1 b 16.4 b 15.5 a 11.1 b 14.3 c 14.3 a 11.4 a 21.6 b 102.7 a 29.3 a 27.4 a 109.7 a zMeans with the same letter in a column are not significantly different statistically at P < 0.05. Table 2. Nutritional trait means of ‘USDA Red’, ‘Bordeaux’ (red-veined cultivar), ‘Red Deer’ (red-veined cultivar), and ‘Polar Bear’ (standard green-leaf cultivar) grown in field trials conducted in Salinas, CA, in 2015–18, on fresh weight basis. Betacyanin (mg/g) Antioxidant capacity (TE mmol/g) 2015 2016 2017 2018 2016 2017 2018 Genotype 52 DAP 45 DAP 52 DAP 45 DAP 59 DAP 57 DAP 45 DAP 52 DAP 45 DAP 59 DAP 57 DAP USDA Red 78.9 az 145.9 a 157.4 a 131.3 a 222.3 a 280.4 a 34.2 a 43.8 a 20.7 a 38.5 a 39.6 a Bordeaux 54.6 b 99.7 b 93.1 b 90.1 bc 131.2 b 128.5 b 27.0 b 31.7 bc 17.4 ab 23.9 b 23.7 b Red Deer — 101.9 b 95.4 b 100.4 b 138.2 b 117.5 b 25.7 b 27.9 c 15.9 b 19.1 b 19.5 b Polar Bear 12.9 c 77.4 c 82.3 b 72.5 c 100.7 c 86.7 c 24.8 b 36.6 b 18.3 ab 22.8 b 23.2 b zMeans with the same letter in a column are not significantly different statistically at P < 0.05. DAP = days after planting; TE = Trolox (6-hydroxy-2,5,7,8-tetramethylchroman-2-carboxylic acid) equivalent. Table 3. Nutritional trait means of ‘USDA Red’, ‘Bordeaux’ (red-veined cultivar), ‘Red Deer’ (red-veined cultivar), and ‘Polar Bear’ (standard green-leaf cultivar) grown in field trials conducted in Salinas, CA, on fresh weight basis. Concentrations of chlorophyll, phenolics, and flavonoid were measured52d after planting (DAP) in 2015, while b-carotene and vitamin C concentrations were determined 57 DAP in 2018.