Influence of growth regulators on skin colour and scab diseases of red-skinned potatoes

Abstract

Waterer, D. 2010. Influence of growth regulators on skin colour and scab diseases of red-skinned potatoes. Can. J. Plant Sci. 90: 745Á753. A uniform dark red skin colour is desirable in table potatoes; however, the colour of the popular red-skinned cultivar Norland is variable and tends to fade during storage. This study evaluated the potential to enhance skin colour of red potatoes by foliar application of the auxin-type herbicide 2,4-D or long-lasting analogs of the naturally occuring hormone abscisic acid (ABA). In field trials conducted from 2007 to 2009, the plant growth regulators (PGR) were applied to the foliage of Norland and AC Peregrine Red (a new dark red variety) potato plants when the crop was at the tuber set stage. Although the 2,4-D treatments altered the appearance of the foliage they had no consistent impact on yields or tuber shape, but did reduce the average tuber size. Objective and subjective assessments indicated that the 2,4-D treatments altered the skin colour of the tubers both immediately after harvest and after extended cold storage. The degree and nature of the colour change was somewhat dependent on the year, the rate of 2,4-D applied and the cultivar. The change in tuber appearance arising from the 2,4-D treatments was not always considered desirable by consumer panellists. The 2,4-D treatments also reduced tuber damage by common scab (Streptomyces scabies), but tended to increase grade out to powdery scab (Spongospora subterranea). The ABA analogs had no consistent impact on yields, skin colour or disease reaction.

The Effect of Biostimulants on the Health Status and Content of Chlorogenic Acids in Potato Tubers (Solanum Tuberosum L.) with Colored Flesh

“…According to Sawicka (1999), growth regulators (Mival, Potejtin, Moddus 250 ME) intensified the severity of Streptomyces scabies infections, in particular in dry years. 2,4-dichlorophenoxyacetic acid (2,4-D) reduced the symptoms of the disease caused by S. scabies (Waterer 2010) and influenced the growth of potato plants, potato yields and the color of red-skinned cultivars (Red LaSoda and TerraRosa) (Thornton et al 2013). In a previous study by Cwalina-Ambroziak et al 2015, Bio-Algeen S-90 and Kelpak SL growth regulators and the Asahi SL biostimulant did not affect the severity of common scab, soft rot and black scurf on stored potato tubers.…”

Relationship Between the Application of Foliar Chemicals to Reduce Common Scab Disease of Potato and Correlation with Thaxtomin A Toxicity

“…Also, 2,4-D as a powerful synthetic auxin has an impact on potato tuber anatomy and physiology; however, it is not conclusively known whether these changes have any role in affecting common scab disease development (30). Whereas 2,4-D is primarily known as a herbicide, it is also used commercially in potato production at low concentrations to enhance red skin coloration, without apparent tuber distortion or yield effect (32).…”

Image‐based phenotyping and genetic analysis of potato skin set and color

“…Tuber appearance has a strong impact on marketability and is therefore important to evaluate during variety development. Historically, potato breeders have used visual ratings (i.e., 1-5) to score traits that affect tuber appearance, Crop Science F I G U R E 1 Biconic geometry of the hue, chroma, and lightness quantified to study the influence of variety and management on color (Andersen, Tong, & Krueger, 2002;Hung, Murray, Ohmann, & Tong, 1997;Roe, Carlson, McManimon, Hegeman, & Tong, 2014;Rosen, Roessler, Petracek, Engelman, & Tong, 2009;Waterer, 2010). With image-based phenotyping, however, the goal is to simulate human perception of color rather than its chemical basis.…”