From 1986 through 1993 wild rose species were investigated throughout China to catalog and to characterize the rose germplasm resources in mainland China. Many of the 94 rose species and 144 rose varieties in China have not been extensively utilized. The basic features of Chinese rose species are as follows. (1) There are many valuable and rare Rosa species in China. These species are sources of many unique and outstanding characters such as intense fragrance, white and yellow flower color, recurrent flowering and resistance to stress. More than 80% of the rose species in China are native to only China. (2) Although most Rosa species are still in the wild state, a few species cultivated from very early time have many forms available. (3) The number of rose species gradually increases from Northeast to Southwest China. The distribution centers of Rosa species in China are Sichuan and Yunnan Provinces. Chinese rose species can be introduced and used directly in gardens, or in breeding programs to develop new roses.
develop roses with durable resistance to rose black spot disease. Literature Cited Bolton, A.T. Svejda, F.J. 1979 New race of Diplocarpon rosae capable of causing severe black spot on Rosa rugosa hybrids Can. Plant Dis. Surv. 59 38 Colbaugh, P.F. Crow
Poor germination in Rosa has been an obstacle to breeding programs for years. Rose breeders generally stratify rose seed under cool, moist conditions for 4-10 weeks by planting directly into the seedling flat/bed or in a small container followed by planting the germinating seed into the seedling flat/bed. This experiment used 9 genotypes and compared these two approaches combined with variations in the stratification media (sand, perlite, sphagnum moss and Sunshine Mix #4). Over all stratification media and genotypes, germination was not influenced by whether the seed was stratified directly in the seedling flat/bed or in a small container. However, the process of transplantation of the delicate germinating seed from the small container to the flat/bed resulted in greater mortality of the germinating seedlings. he stratification media affected the germination of the rose seed. Sunshine Mix #4 gave the best germination as compared to all other media types tested. As expected the germination of the genotypes varied greatly, ranging from 0.7% to 37.1%.
., 2016 ), but the identification and analysis of Dof transcription factor family in Rosa is rarely reported. As one of the most important commercialized flower plants worldwide, the research on Rosa has been greatly promoted based on the Rosa
The genus Rosa contains more than 200 species distributed in Europe, Asia, the Middle East, and North America ( Li et al., 2013 ). The genus is represented by 22 species in the Slovenian flora, among which R. canina , R. glauca , R. rubiginosa
Abstract
‘Forever Yours’ roses (Rosa Hybrid Tea) were grown in recirculating nutrient solutions at 0.25, 2.5, 5.0 and 10.0 meq K/liter. Low K supply (0.25 and 2.5 meq/liter) reduced growth, flower production, and length of flowering stems. Leaf K concentration was reduced at the lowest K concentration in solution. Increasing K concentration in solution from 0.25 to 10.0 meq/liter had no antagonistic effect on the accumulation of Ca or Mg in the leaves. Plants which received 0.25 meq K/liter developed K deficiency symptoms after 5 weeks of growth in treatment solutions.
. < http://saaesd.ncsu.edu/docs/National%20Green%20Industry%20Survey%20report%202014%20SCSB%2052615.pdf > 10.1080/00087114.2010.10589722 Jian, H. Zhang, H. Tang, K. Li, S. Wang, Q. Zhang, T. Qiu, X. Yan, H. 2010 Decaploidy in Rosa praelucens Byhouwer
disease resistance to black spot have been characterized in roses. Vertical or complete resistance, which blocks sporulation and severely restricts the mycelial growth of the pathogen, is usually controlled by major dominant genes ( Rdr or Rosa disease
; Cui et al., 2016 ; Li et al., 2015 ; Liu et al., 2016a ; Pan et al., 2015 ; Wang et al., 2016 ; Zhao et al., 2015 ). Rosa roxburghii Tratt (RR) (Rosaceae) is a perennial rosebush native to China. Its cultivation area has gradually expanded
The hybrid origin of 23 rose (Rosa spp.) accessions was examined with three isozymes: acid phosphatase (E.C.3.1.3.2), malate dehydrogenase (E.C.1.1.1.37), and phosphoglucose isomerase (E.C.5.3.1.9). All three isozymes were useful for interspecific hybrid verification. This procedure was effective if the putative parents were known and differed in isozyme phenotype. To verify the origin of hybrid species or cultivars with hybrid origins, isozymes were useful but limited by the number of generations since the original hybridization and the number of accessions of the putative parental species assayed.