(2) The inflorescence and tendrils of inflorescence grape belong to homologous organs, both of which are malformed stems, and the ear axis has the same structure as tendrils and new shoots. In the process of flower bud formation, tendrils can be transformed into inflorescences when nutrition is sufficient, and inflorescences will stop differentiating and become tendrils when malnutrition occurs. Therefore, according to the degree of inflorescence development, it can be divided into fully developed inflorescences, inflorescences with tendrils and inflorescences with tendrils.
The inflorescence of grape consists of peduncle, inflorescence axis, branches, pedicels and buds. The whole inflorescence is panicle-shaped and conical. The flower buds in the middle of inflorescence mature and open the earliest, followed by the flower buds at the base, and the flower buds at the ear tip mature and open the latest. The time required for the whole inflorescence to open is generally 6-8 days, and the flowering peak is on the second to fourth day. The flowering time of inflorescence is closely related to climatic conditions. When it is cold and rainy, the flowering time will be delayed. In a day, it is most open at 7 ~ 10 in the morning. The number of flowers per inflorescence of grapes varies with varieties, tree ages and cultivation conditions. Generally, there are 200 ~ 500 flowers in an inflorescence, which can reach about 1500 at most. When the inflorescence is renovated, the number of flowers can be determined according to the needs. Generally, only the flower tips can be thinned, and only 20 ~ 30 fruits can be left per ear for large fresh food species such as rattan spikes.
The inflorescence position varies with varieties: the 1 inflorescence of Eurasian species is mostly planted in the 5th or 6th node of new shoots, while the 1 inflorescence of European hybrids and American species is generally planted in the 3rd or 4th node of new shoots. The length of trimming should be determined according to this feature.
(3) The grape spike is the flower of inflorescence. After pollination and fertilization, the ovary develops into a berry and the inflorescence becomes an ear. A spike consists of a spike axis, a spike node and berries. The first branch from the new tip to the ear is called the ear stalk. The nodes on the ear stalk are called ear stalk nodes. When berries are ripe, the parts above the nodes can generally be lignified; The middle axis of the ear is called the trunnion, which has two, three and four axes. The first branch of the ear axis is particularly developed, often forming a secondary ear, and the main part of the fruit ear is called the main ear. The shape and size of ears vary from species to species. The shape of the ear can be divided into: cylindrical, single-shoulder cylindrical, double-shoulder cylindrical, conical, single-shoulder conical, double-shoulder conical, branched and so on. The size of ears can generally be divided into five categories: the ear with a length of more than 25 cm is the largest ear; 20 ~ 25 cm is the big spike; 13 ~ 20 cm is the middle ear; 10 ~ 13 cm is the spikelet; Spikelets below 10 cm are extremely small. According to the planting density of ear, it can be divided into tight ear, loose ear and scattered ear. Generally, flat and upside down without deformation is called tight nail, and vice versa. All branches are free-form, especially for scattered ears. The ears of fresh grapes should not be too tight, and there is no special requirement for wine varieties. Ear renovation can be arranged according to this requirement to improve the value of goods.