Genetic Variation Analysis Of Radish Raphanus Sativus In Tibet

Raphanus sativus is a main kind of vegetable in the genus Raphanus of Cruciferae Vegetable.InTibet the planting areas of Raphanus sativus which has a long history and qualities unique are wider.Butbreeding history of Tibet Raphanus sativus which has complex genetic background are short and it hasnot yet been released varieties.Study on genetic variation of radish in Tibet are still in the blank,so it is necessary to carry outresearches on genetic variation of Tibet Raphanus sativus.Through the study, we know exactlyvernalization,the Botany Character and physiological characteristics of the Tibet Raphanus sativus.Define the taxonomy and analysis the Genetic Rule of the special character of Tibet Raphanus sativus.Provide scientific reference for further study and exploitation on Tibet Raphanus sativus.The research adopted method:seed production of vegetable crop and building six generationsincludingP₁、P₂、F₁、F₂、Bc₁、Bc₂.Then survey of the main botany charactersin seedling.The research adopted Statistical Analysis of Gaijunyu-applying the major gene plus poly-genemodel of quantitative traits to joint analysis of six generations.Best Genetic Model of the main characters in Tibet Raphanus sativus was determined primarily.The author has got good results in such research, and the main contributions were as follows.（1）The four essential materials:inbred lines in populations of Jia Raphanus sativus H₁、H₂and ofTibet Raphanus sativus Z₁、Z₂were treated by means of vernalization,cold acclimation. Temperaturewas3-4℃, This experiment setted four disposals: chilling at3-4℃for20d、30d、40d、50d. As a result,thebest disposal was chilling at3-4℃for40d.（2） Genetic analysis was conducted on a most leave length,number of leaves，number ofleatherleaf，rootlength，root diameter and outside rootlength，root weight，the thickness of velamen ofmultiple generations，P₁，P₂，Bc1，Bc₂，F₁and F₂derived from a cross between P₁with highercomprehensive score and P₂with lower comprehensive score，using the method of major gene pluspolygenes mixed inheritance model in quantitative traits of plants.It could be concluded that theoptimum model of the most leave length was an additive-dominant major gene plus additive-dolninant-epigenous polygenes mixed inheritance model,and number of leaves、number of leatherleaf、outsiderootlength and root diameter with the same inheritance model was an additive major gene plusadditive-dominant polygenes mixed inheritance model;the optimum medel of root weight was twoadditive-dominant-epigenous major genes plus additive-epigenous polygenes inheritance model, andthat of the thickness of velamen was two additive-dominant major genes plus additive-dominantpolygenes mixed inheritance model.