A kind of breeding method of early flowering cosmos

Abstract

The invention discloses a method for breeding early blossoming coreopsis. The method includes parent breeding material selection, field planting, pollination, obtainment of AF1 and BF1 generation hybrid seeds, hybrid seed sowing and seedling raising, selection of single plants with bright yellow flowers among the AF1 and BF1, obtainment of AF2 and BF2 generation hybrid seeds, cross pollination with the AF2 as female parent and the BF2 as male parent in third spring, obtainment of hybrid seeds AF3, AF3 sowing and seedling raising, field planting selfing to obtain F4 generation seeds, F4 generation seed sowing, operation of adjusting plant height to be lower than 60cm and flower diameter to be smaller than 4.5cm, and early blossoming, the seed yield is high, 3-4 generations of continuous selfing of a breeding target are performed, and a stable novel variety of early blossoming bright yellow coreopsis can be obtained. By means of the method for breeding early blossoming coreopsis, the obtained novel variety is vigorous in growth, good in appreciation, long in appreciation period, plump in plant shape and high in seed yield. By means of the method, bright yellow early blossoming coreopsis is selected, the variety types of the coreopsis can be increased, the types of appreciation garden plants are enriched, and the effect of greening appreciation can be improved.

Description

technical field [0001] The invention relates to a breeding method for ornamental plants, in particular to a breeding method for obtaining new varieties of cosmos, belonging to the technical field of plant cultivation. Background technique [0002] Cosmos (Cosmosbipinnatus) is an annual herbaceous plant of the family Asteraceae, with a plant height of 30-120 cm, erect thin stems, many branches, smooth stems or fine hairs. Single leaves opposite, bipinnatisect, flower heads on slender pedicels, terminal or axillary, flower diameter 3-8cm. The edge of the disk is ligulate-shaped, and the tip of the petals is tooth-shaped. There are 7 to 8 petals, and there are different flower colors such as white, pink, red, yellow, purple, etc. The tubular flowers occupying the central part of the disk are all yellow. The achenes have rafters, the life span of the seeds is 3-4 years, the thousand-grain weight is about 5-7 grams, and the flowering period is summer and autumn. Horticultural v...

AI Technical Summary

Problems solved by technology

After consulting the data, it is found that all types of cosmos currently sold on the market are conventional varieties, and no reports of breeding new varieties of cosmos have been found.

Images