Genetic Resources, Biodiversity, Conservation, and Utilization in the Improvement of Carrot (Daucus carota L.)
摘要
Plant genetic resources are essential to crop development because they supply the genetic variety and genetic variation that are required for agricultural progress. This makes plant genetic resources an essential component of crop improvement. One of the top 10 vegetable crops cultivated worldwide, carrots are a substantial source of essential vitamin A due to their orange carotenoid pigments. The majority of the information suggests that carrots were domesticated as a root crop rather recently, circa 1100 years ago in Central Asia, with the most significant breeding effort taking place in Europe during the past 500 years. Breeders developed open-pollinated genotypes because the crop was an outcrosser and could not be vegetatively propagated, but in the 1950s, the discovery of cytoplasmic male sterility paved the way for the generation of hybrid cultivars. Since carrots were domesticated, color has been a significant characteristic that has been acknowledged. When orange carrots were first seen in Europe, yellow and purple were the colors of note, and red carrots are now significant in a number of Asian markets. There are a large number of ex situ carrot germplasm collections located all over the world, with 62 distinct institutions reporting a total of more than 13,400 accessions. In spite of the fact that the vast majority of the Daucus accessions that are maintained are of cultivated origin, the current interest in and understanding of the relevance of crop wild relatives has led to a significant increase in the number of wild Daucus accessions that are conserved in genebanks, particularly in the United States. This trend is expected to continue in the future. Maintaining carrot genetic resources can be accomplished by the application of in-situ on-farm and genetic engineering approaches, all of which are well suited for working with wild and landrace material. It is beneficial to identify and use core collections and subsets in research since doing so allows one to more precisely reflect the variety of genepools while still employing a number of samples that can be easily managed. This is as a result of the enormous size of the Daucus collections located in different parts of the world.