Inheritance of Determinants of Flower Colour in Tetraploid Roses

Abstract

The choice of selection breeding for crop improvement in cut roses requires a better understanding of biological mechanisms and knowledge of the inheritance of the major target traits which can lead to new or improved screening methods. Colour is still the most important trait in cut roses. A tetraploid mapping population will be characterized for flower colour, by using colour charts such as the official chart of the Royal Horticultural Society, and additionally, by image analysis and measuring reflectance using a spectrocolorimeter. The genetics of flower colour will be studied. In addition, flower petals of all genotypes will be analysed by HPLC to characterize secondary metabolic components that determine flower colour, such as anthocyanins. The inheritance of these components will also be assessed and compared to that of flower colour. Preliminary results show that the most effective method to quantify colour is by HPLC analysis of the extracted anthocyanins. The highest pelargonidin concentrations occur at relatively low cyanidin concentrations. Absorbance and reflectance measurements illustrate the accumulated effect of all the individual anthocyanins present in the petal.

Molecular and morphological characterization of new interspecific hybrids of alstroemeria originated from A. caryophylleae scented lines

“…The differences expressed in terms of tepal color for the hybrid plants in this study are minor considering that almost all the hybrids showed pink tepals and only two of them showed white tepals. Heredity of color has been well described in several species, including ornamental plants such as chrysanthemum (Lema-Rumińska and Zalewska 2005) and roses (Gitonga et al 2009). Flower color polymorphism is due to variation in floral pigments, particularly anthocyanins and a predominance of pink, purple and blue with white combinations has been described as the result of changes and single mutations in the anthocyanin pathway (Richards 1986).…”

Breeding of New Ornamental Varieties:Rose

“…Dark red, scarlet, orange, yellow or white, are recessive. Dominant and recessive nature of different characters along with pollination mechanism has been reported by different workers 17,[34][35][36]43,56,88,89,91 .…”

Assessment of Genetic Relationships between Streptocarpus x hybridus V. Parents and F1 Progenies Using SRAP Markers and FT-IR Spectroscopy

“…As shown in supplementary file (Table S1), morphological characterization of the flowers of genitors and F1 progenies was carried out to evaluate the ornamental value of the new progenies. The heredity of color in several species has been studied previously in other ornamental plants such as chrysanthemum [45], roses [46], and alstroemeria [47]. The results of these reports suggest that flower color polymorphism is due to variation in floral pigments, especially anthocyanin (slight changes and single mutations in the anthocyanin pathway) and a predominance of pink, purple, and blue with white combinations [48] (pp.…”