About PIWI Grapes
PIWI Grape Varieties
Ripens a few days before Baco Noir
Peronospora: very good
Oidium: very good
Botrytis: very good
Regent is a crossing of Diana X Chambourcin. Diana is a crossing of Silvaner X Müller-Thurgau; Chambourcin is a complex French hybrid grape variety.
Regent is a dark-skinned interspecific hybrid grape variety.
Regent is a cool-weather red winegrape.
Grapes: Regent provides medium-sized grapes and clusters
Wine: Regent wines are color intensive red wines with moderate acidity, can have high tannin content and show aromas of cherries or blackcurrants. The wines often reach high alcohol levels since Regent tends to reach high must weights.
Powdery mildew responsive genes of resistant grapevine cultivar 'Regent’
“The cultivar 'Regent' is resistant to powdery mildew due to an introgression from an American Vitis sp. resistance donor. To identify key regulatory elements in defense responses of 'Regent' we performed transcript analyses after challenging with E. necator inoculation in comparison with a susceptible grapevine.”
Impact of Cluster Zone Leaf Removal on Regent Polyphenol Content ”Leaf removal, especially early defoliation (pre-flowering), enhanced total polyphenol content, including the amount of anthocyanins, flavonols and flavan-3-ols and furthermore, it increased the amount of soluble solids, decreasing the titratable acidity in grapes. On the other hand, the treatments had a reducing impact on the phenolic acids in berries. Defoliation at earlier stages of cluster development appears to be an efficient strategy for improving berry quality in cool climate areas”. Link: https://www.mdpi.com/1420-3049/21/12/1688
Effect of Rootstock on Yield and Quality of Grapevine ‘Regent’
The three-year research period indicates that the vines on ‘125AA’ tended to produce not only the highest yields but had positive influence on the number and weight of clusters and berry weight as well. Whereas the vines grafted onto ‘161-49C’ gave the lowest yields and had the smallest number of clusters per vine
Comparative study regarding two German varieties – Regent and Dornferlder
The two varieties were studied mostly because of their popularity they have in their origin country (Germany), but also because of their resistance in Mildery and Grey rot.
A 'Regent' pedigree update: ancestors, offspring and their confirmed resistance loci
'Regent' is the fungal resistant grapevine cultivar with the highest acreage in Germany and an important resistance donor in international breeding programs. It carries the resistance loci Rpv3.1 as well as Ren3 and Ren9 against downy and powdery mildew, respectively. As the parents of 'Chambourcin', the resistant paternal ancestor of 'Regent', did not coincide with the breeder's information, the germplasm repository of JKI Geilweilerhof was screened to find the missing ancestors. SSR marker analysis revealed that 'Joannes Seyve 11369' and 'Plantet' are the true parents of 'Chambourcin' and not 'Seyve Villard 12-417' and 'Chancellor'. Furthermore, the origin of the resistance loci Ren3 and Ren9 could be traced back to the genotypes 'Seibel 4614' and 'Munson'. Since the breeder Hermann Jaeger mentioned 'Munson' as a direct descendant of Vitis aestivalis Michx. var. linsecomii (Buckley) L. H. Bailey and Vitis rupestris Scheele, one of these wild species might have been the donor of the loci.