High-yield seed production method of early-ripening maizes

Abstract

The invention discloses a high-yield seed production method of early-ripening maizes. The near relation sister line 314 S or early 314 L is crossbred with the original female parent L314 to generate a sibling species as the female parent, and the L18 is used as the male parent to be prepared into a hybrid species, i.e., Xinyu NO. 29, so that the seed production yield is improved, and the production cost of seeds is further reduced; meanwhile, compared with the original Xinyu NO. 29, the Xinyu NO. 29 prepared by the sister line hybrid seeds retains the consistency in yield, stability, adaptability and agronomical character; 30 mu of the Xinyu NO. 29 produced with the sibling species are planted in Company 5, Southern District, 163rd Regiment of 9th Agricultural Division, Tacheng District, Xinjiang Jiuhe Seed Company in 2008, the average seed production yield is 376.6 kg / mu, and the high yield reaches 442.6 kg / mu, and is increased by 40 percent than the original hybrid species; and 1500 mu of the Xinyu NO. 29 produced with the sibling species are planted in 164th Regiment, Tacheng District in 2009, the seed production yield is 460 kg / mu, and through the seed production of the sibling species, the seed production yield is effectively improved, and the cost is reduced.

Description

technical field [0001] The invention relates to the technical field of hybrid seed production, in particular to a high-yield seed production method for early-maturing corn. Background technique [0002] Maize hybrid seed production is the continuation and development of heterosis utilization. Seed quality and yield directly affect the potential of corn heterosis to increase yield and the commercial development and promotion of varieties. After a new corn variety is bred, high-quality and sufficient hybrid seeds should be produced for corn production. However, although some new corn varieties have high and stable yields, they are not conducive to large-scale promotion due to the low yield of the parental inbred lines and high seed production costs. application. The low yield of maize hybrid seed production is due to the fact that in maize breeding, genetically improved homozygous inbred lines are obtained through multiple generations of continuous selfing and selection, and ...

AI Technical Summary

Problems solved by technology

[0008] 1. The yield of hybrid seed production is low; because the growth period of the two parents is early, their own yield is not high, and the reproduction coefficient is low. Generally, the yield of spring seed production is 180-200 kg / mu

[0009] 2. The growth period of the two parents is quite different; the growth period of the female parent is 120 days (emergence to maturity), and the growth period of the male parent is 106 days (emergence to maturity), and the male and female flowering periods are not easy to control during seed production

[0010] 3. Due to the differences in the growth period and plant height of the parents, the ratio of the parents for seed production is generally 2:6 or 1:4. If the ratio of the parents is increased, the seed setting rate of the seed production will decrease

[0011] 4. The parents are sown in stages, the female parent is sown first, and the male parent is sown 18 days later, which increases the production cost of seed production in the process of seed production

[0012] 5. Due to the weak germination potential of the parental inbred line, it is difficult to achieve "one-sow all seedlings", and factors such as low planting density in field seed production affect the increase in seed production

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