Latest Reports and Publications

September, 2019

Theoretical and Applied Genetics, September 28, 2019
(2019), 0040-5752

The article can be viewed here  

Abstract: Rouet, C., Lee, E.A., Banks, T. et al. Black spot, caused by Diplocarpon rosae, is one of the most serious foliar diseases of landscape roses that reduces the marketability and weakens the plants against winter survival. Genetic resistance to black spot (BS) exists and race-specific resistance is a good target to implement marker-assisted selection. High-density single nucleotide polymorphism-based genetic maps were created for the female parent of a tetraploid cross between ‘CA60’ and ‘Singing in the Rain’ using genotyping-by-sequencing following a two-way pseudo-testcross strategy. The female linkage map was generated based on 227 individuals and included 31 linkage groups, 1055 markers, with a length of 1980 cM. Race-specific resistance to four D. rosae races (5, 7, 10, 14) was evaluated using a detached leaf assay. BS resistance was also evaluated under natural infection in the field. Resistance to races 5, 10 and 14 of D. rosae and field resistance co-located on chromosome 1. A unique sequence of 32 bp in exon 4 of the muRdr1A gene was identified in ‘CA60’ that co-segregates with D. rosae resistance. Two diagnostic markers, a presence/absence marker and an INDEL marker, specific to this sequence were designed and validated in the mapping population and a backcross population derived from ‘CA60.’ Resistance to D. rosae race 7 mapped to a different location on chromosome 1.

Ontario horticulture research priority report 2019
July, 2019

Features

  • Edible horticulture
  • Ornamental horticulture
June, 2019

Journal of Sensory Studies, June 20, 2019, e12526.
The article is available here at a cost.

Abstract: Grygorczyk, A., Jenkins, A.E. and A.J. Bowen. Sensory and consumer testing of live rose bushes presents several unique logistical challenges due to product size and the need to present roses during a small window of opportunity when they are in full bloom, the timing of which differs from plant to plant. The current study determined whether online (close up photographs of rose blooms) and in‐person (live plants) liking tests produced comparable results and discusses the logistical considerations of in‐person testing. Three studies were conducted: two in‐person to compare two different study design strategies (n = 199, n = 206) and one online (n = 209). Photos of rose blooms evaluated online did not correlate with in‐person liking evaluations (R2 = .00003). The best approach for in‐person testing (completing testing in 1 week with only blooming roses versus spreading out testing over 3 weeks) depended on the project budget and whether a particular rose of interest needed to be in the sample set.

June, 2019

To support growers, Vineland has conducted a series of agronomic trials in 2017 and 2018 to better understand how to grow this crop efficiently. Results on spacing, days to maturity, harvesting, postharvesting and pest management have been compiled into an easy-to-read research update report.

May, 2019

Journal of Sensory Studies, May 30, 2019, e12524.
The article is available here at a cost

Abstract: Bowen, A.J., Blake, A. and J. Turecek. This study reports on the development of a process to objectively evaluate color using descriptive analysis. Panelists established a color lexicon (hue, lightness, evenness) and a two‐dimensional reference tool. The lexicon was applied to 23 baked sweet potato cultivars, along with a flavor lexicon. Color attributes all differentiated the products; most of the variation was due to color evenness. A consumer acceptance test (n = 204) was conducted on a subset of the products and showed a strong bias for specific color attributes. Consumers liked even, light‐orange hue; however, small changes in color dimensions impacted visual appeal. Overall characterization of products is described by a three‐factor principal component analysis solution. F1 (44% variance) correlated to moist texture and a redder‐orange hue and inversely correlated to stickiness. F2 (30% variance) correlated with high evenness and inverse correlation with acidic, bitter taste, and earthy aroma. F3 (15% variance) correlated to high sweet taste and caramel aroma.

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