Using molecular markers to study genetic
markers present at the molecular level (molecular marker), which is a high-efficiency plays an important role in agriculture. Especially in plant breeding. This is essential to create a new vegetation and can be used to monitor gene and DNA. In order to separate species. As well as knowing the genetic relationship between species. Due to its characteristics Outside is unable to differentiate strains of plants that are closer genetic. Therefore, it is necessary to measure other types of assembly. To help distinguish the species is accurate. Later, the development of marker proteins (protein marker), as isozymes (isozyme) to assist in the identification of the different species (varietal identification) using different types of protein molecules as elements. Check (Sureeporn, 2546), but found that the marker protein is a major limitation. Check the number of genes that have not been studied much, and genes must be expressed (gene expression) with the inspection have to choose plants and the growth stage of the crop. In addition, the app also depends on the environment. Effective in distinguishing between organisms decreased (Krkch, 2550) of such restrictions has been developed a new technique RFLP (restriction fragment length polymer phism) by the difference in the size of the DNA. caused by the cutting enzymes cut Specification (restriction enzyme) to differentiate the DNA directly. Therefore, without the influence of the environment came on the results of the audit are accurate and reproducible results the same, however, this technique is still limited. The process is complex and time-consuming. As well as labor and the cost of operation is high. DNA used to have plenty, and be purified (Kaundun et al., 2000) subsequently developed methods of DNA by PCR (polymerase chain reaction: PCR), a technique that is quick and easy. PCR can target large quantities in a short period. Through the work of the enzyme DNA polymerase then developed a new molecular technique RAPD increased as well (random amplified polymorphic DNA: RAPD) technique RAF LP. (Amplification fragment length polymorphism: AFLP) microsatellites Mountain property. (Microsatellite) or SAS SR (SSR marker) (Sureeporn, 2546) can be used to distinguish between strains and can distinguish the species
, the use of molecular markers for the selection. and distinguish the characteristics of each strain that expresses a precise and fast. And can characterize gene of interest.
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