Breeding method of variety of extremely early-maturing sweet potatoes

Abstract

The invention relates to a breeding method of a variety of extremely early-maturing sweet potatoes and belongs to the technical field of conventional hybridization breeding. The method comprises the steps of sowing hybrid seeds through a substrate, wherein the height of seedlings reaches 25+ / -5 cm 45+ / -5 days after sowing; investigating the potato setting condition of the seedlings; selecting a strain with the expanded diameter over 0.8 cm as a new strain of selected seedling potatoes; then, breeding the new strain of extremely early-maturing sweet potatoes. The new variety of the extremely early-maturing sweet potatoes has the advantages of high breeding accuracy rate, short breeding period and low breeding cost.

Description

technical field

[0001] The invention relates to a breeding method for extra-early-maturing sweet potato varieties, which belongs to the technical field of conventional cross-breeding. Background technique

[0002] Sweet potato is an annual or perennial vine herb. Although there is no fixed growth period, due to the influence of natural conditions and virus accumulation, the actual growth period of sweet potato is 4 months. The normal planting date in the northern potato area is after the first ten days of April, and the normal harvest period is after the first ten days of August. The sweet potatoes stored in the previous year are generally sold out in May, so the supply of sweet potatoes in the northern potato area is empty from June to August. schedule. Extra-early-maturing sweet potatoes refer to sweet potatoes whose diameter exceeds 3cm and weighs more than 200g when the sweet potatoes are planted for 60 days. The planting of early-maturing varieties with a growth perio...