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Objective To evaluate the indeterminate growth mutant of tomato derived by space mutagenesis to provide the basis for selecting and cultivating the molecular markers of tomato growth habit. Methods Fifty 10-mer randomly amplified polymorphic DNA(RAPD) primers were used to examine the polymorphism of M1 and 10-3-2. Their polymorphic fragments were cloned, and then were transferred to SCAR markers. Results Of all the 50 10-mer RAPD primers, 44 primers amplified polymerase chain reaction(PCR) products and 2 primers (S165 and S168) amplified stable reproducible polymorphic products. The molecular weight of the specific amplified products were 300 bp and 1 500 bp respectively, therefore they were named as TRS165300 and TRS1681500 temporarily. And TRS1681500 was transferred into stable sequence characterized amplified region(SCAR) marker and this marker could be a specific genetic marker of this indeterminate growth habit mutant. Conclusion Space mutation can produce mutants at DNA level from the loaded materials. The indeterminate growth mutant of tomato is derived by space mutagenesis which can provide a valuable material for studying the regulation and control of tomato growth habit.
RESUMEN
Objective To analyze the new breeding of eggplant "HANGQIE-5"(HQ-5) generated by space mutagenesis with RAPD,identify the differential RAPD bands,and try to provide molecular proofs for space mutation breeding.Methods Dry seeds of two eggplants "Tianshuichangqie(TSCQ)" and Longguoyuanqie(LGYQ) were carried by "shenzhou-4" and "shenzhou-3"spaceship.Two mutant lines "TSCQ-MUT-4" and "LGYQ-MUT-4" were selected after four generations of self-cross of TSCQ and LGYQ.A new variety of "HQ-5" was selected by crossing the two lines of "TSCQ-MUT-4" and "LGYQ-MUT-4",which were male and female,respectively.The RAPD reaction system was optimized with orthogonal design and further RAPD analysis was applied.Results The RAPD reaction system was determined as follows: DNA: 40 ng,dNTPs: 7.5 nmol,primer: 10 ng,and rTaq polymerase: 1.25 U.The RAPD results displayed that TSCQ-MUT-4 produced four differential bands compared with its wild type,while LGYQ-MUT-4 produced one,through space flight.Six differential fragments were amplified between HQ-5 and the paternal/maternal.HQ-5 not only shared the common fragments with its parents,but also held some particular ones,which were stably inherited.Conclusion The results indicate that space mutagenesis could cause mutations in DNA of plants,and is helpful to generate a new breeding.