Available online at www.ijpab.com Dhakar and Soni Int. J. Pure App. Biosci. 6 (1): 442-451 (2018) ISSN: 2320 – 7051 DOI: http://dx.doi.org/10.18782/2320-7051.5192 ISSN: 2320 – 7051 Int. J. Pure App. Biosci. 6 (1): 442-451 (2018) Review Article Genetic and Molecular Basis of Petal Pigmentation in Floriculture Crops: A Review Sunita Dhakar1* and Anjali Soni2 1Division of Floriculture and Landscaping, ICAR- IARI, New Delhi 110012, India 2Division of Fruits and Horticultural Technology, ICAR-IARI, New Delhi 110012, India *Corresponding Author E-mail:
[email protected] Received: 11.07.2017 | Revised: 19.08.2017 | Accepted: 26.08.2017 ABSTRACT Flower colours are of paramount importance in the ecology of plants and their ability to attract pollinators and seed dispersing organisms. The primary pigments occurring in plants are chlorophylls and carotenoids accumulated in plastids, anthocyanins and betalains, which are dissolved in vacuolar sap. Flavonoids and carotenoids are widely distributed in plant pigments. Among the factors influencing flower colour, anthocyanin biosynthesis has been the most extensively studied. Each plant species usually accumulates limited kinds of anthocyanins and exhibits limited flower colour. For example, roses and carnations lack violet/blue colour because they do not accumulate delphinidin-based anthocyanins and petunia and cymbidium lack brick red/orange colour due to the lack of pelargonidin-based anthocyanins. Different approaches are used for development of novel flower colour in floricultural crops like hybridization, mutation and genetic engineering. Advances in molecular biology and plant transformation technology have made possible the engineering of an anthocyanin biosynthetic pathway by the overexpression of heterologous flavonoid biosynthetic genes or the down-regulation of endogenous genes in transgenic plants.