Yidan series corn hybrids purification countermeasures
The Yidan series of corn seeds are used in production. There are mainly corn varieties such as Yidan 8,9,10,11,13,14,16,20 and so on. Because of the special ecological conditions, there are many hybrid corn varieties and their parents. More and more combinations have brought certain difficulties to the quality of the seed. The most fundamental reason for the poor quality of hybrid corn seed is the low purity of the parent seed and poor seed management. First, there is a problem 1. Some seed production and operation units lack long-term market competition awareness and believe that seed purity does not meet national standards or is close to national standards, has little impact on production, and lacks a sense of crisis and responsibility. 2. There are too many generations of reproduction, the purity of the parent seed is not high, and the certification of the variety only pays attention to the performance of the hybrid in the regional test, ignoring the stability of the parent. 3. The mother is not timely and incomplete. Some self-crossed plants have a proportion of more than 30%. 4. It has not been operated strictly in accordance with the technical specifications of seed production. Separation of the production system is not safe and is polluted by alien pollen, which affects the purity of the seed. 5. The purity identification of maize hybrid seeds is mainly determined by field tests. It can only reflect the purity of the field at that time. Even if three inspections are conducted during the flowering period and the minimum results are used, it is difficult to ensure that the results are accurate. Electrophoretic determination of corn seed purity is an effective and reliable method, but due to the combination of hybrid maize and many parents, it is difficult to find the standard bands. Second, the solution 1. From the source to live parental quality A parental reproductive quality assurance system was established to adopt the original original species-original species-original species expansion-preparation seed production technology route to minimize inbreeding generations. If the parental seeds with poor purity of inbred lines and good performance in production but no purity are used, purification and correction shall be carried out within a limited period of time. Take the method of bagging purification, ear line, ear line comparison and breeding. In order to reduce the opportunities for generational intermixing, the parental seeds can be stored in a cold store and purified for a few years in a year. 2. Establish a field management system Establish a post quality responsibility system and strictly isolate conditions to prevent foreign pollen pollution. Focusing on doing things well, the management should be based on the principles of early, medium, and late-stage strictness, strict inspection and supervision with uniform quality standards, and ensuring the quality of decontamination. In order to eliminate the self-crossed plants completely, the leaves must be stripped. After pollination is completed, the father is cut off as a criterion for field acceptance. 3. Strengthen the flowering period inspection Field inspection at the flowering stage is a key link to ensure seed quality. Take a combination of sampling, mutual inspection, and self-inspection. Uniform identification schemes and standards, unqualified seed fields for scrapping. 4. Adhere to the principle of survival of the fittest Focusing on the sampling of parental seeds, hybrids are mainly based on the combination of seed production and cultivation. According to the principle of survival of the fittest, the market competition mechanism is introduced into the scope of seed quality management to increase the quality and competitiveness of production units. 5. Do a good job of purity assessment In order to do a good job in the identification of purity, formulate the cultivation plan and record form for the plot in the field, and identify the purity in three periods, ie seedling stage, flowering stage, and maturity stage. Seedling identification is mainly to observe the seedling sheath color, leaf margin and so on. Florescence was identified based on the traits of leaf shape, plant height, anthers, filaments, and tassel branches. However, due to the influence of weak seedlings, the results are often low, and the best identification period is the mature period. At this time, the characteristics of the varieties have the most obvious characteristics. Therefore, the purity of the hybrid corn should be planted mainly in the mature period, supplemented by the flowering period, Seedling period for reference comprehensive assessment. Disclaimer: Some articles in this website have been transferred from the Internet. If you are involved in third party legal rights, please inform this website. phone Shaanxi Kang New Pharmaceutical co., Ltd. , https://www.kangnewpharmas.com