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野生种是栽培种形成的源泉,是栽培种遗传变异力最广泛的基础,是育种工作不可忽视的宝贵资源。向日葵起源于Helianthus 属的野生种,是由野生向日葵的突变亚种演化来的。按照最新分类观点,本属内包括49个种和19个亚种,其中12个一年生种和37个多年生种。它们起源于北美,广泛的地理分布和多变的环境条件,使它们表现出高度的遗传变异性,形成基因型各异,形态多样的野生种。经过长期的自然选择,向日葵野生种中具有一些栽培种缺乏的重要种质资源。如:对病虫害及其它不利的自然因素的抗性资源;培育胞
Wild species are the source of cultivated species, which is the most extensive basis for genetic variation of cultivated species and a valuable resource that can not be ignored in breeding. Sunflower originated in the wild species of the genus Helianthus and is derived from a mutant of the wild sunflower. According to the latest taxonomic classification, 49 species and 19 subspecies are present in this genus, including 12 annual and 37 perennial species. Originating in North America, they have a wide range of geographical distribution and varied environmental conditions that allow them to exhibit a high degree of genetic variability and form genotypes of diverse and diverse wild species. After long-term natural selection, the wild germplasm of sunflower has important germplasm resources lacking by some cultivars. Such as: resistance to pests and diseases and other adverse natural resources resources; nurturing cells