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Mass Production Method of Virus-Free Strawberry Plants Through Meristem Callus

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Mass Production Method of Virus-Free Strawberry Plants Through Meristem Callus Mass Production Method of Virus-Free Strawberry Plants Through Meristem Callus By SADAO NISHI and KATSUJI OHSAWA Department of Plant Breeding, Vegetable and Ornamental Crops Research Station Strawberry virus diseases already attracted after experimenting with more than 20 series the attention of European and American of crop plants such as sweet potato, Irish or scientists as early as the 1920s as an impor­ white potato and lily bulb for 10 years from tant injury for the growing and variety 1957 to 1967. improvement. Subsequently, meristem culture study was Attention was first focused on this disease developed and applied practically all over in Japan when Nishi introduced the American Japan. findings on it and indicated its seriousness But no more than just one plantlet can be 1 in 19571>. Abe and Yamakawa (1959) > suc­ obtained from each meristem by means of cessively reported that Japanese strawberry this culture method. Furthermore, each varieties had already been affected by this plantlet must be checked for its virus infection disease. so high practicability cannot be expected The seriousness of this disease is now well under this method. Under such circumstance, known since Takai (1966) 12> examined the it was urgently necessary to conduct research strawberry cultivars collected from all over to find a more efficient mass production method Japan and reported that almost all the of virus-free plants. Japanese strawberry varieties were tainted with virus. Mass production method of virus-free plants Method to get virus-free plants The authors and their collaborators have Studies on virus disease have been under studied tissue culture, including embryo-, way for many years in the field of plant anther- and meristem-culture for growing of pathology. Numerous attempts have been vegetables and have established the method made to prevent the spread of the disease and of callus formation from anther tissue and several methods have been tested to secure of shoot formation through callus in the course virus-free plants for example; physical (heat of studying anther culture of strawberry8). treatment), chemical (anti viral chemicals) By means of these technics, the callus for­ and surgical methods (meristem culture) . mation of meristem which has been proved as As for anti-viral chemicals, it has not yet a virus-free tissue was obtained and the become practical. But the heat retreatment formation of numerous shoots from this callus and meristem culture have already been put was successful with higher security on the to practical use. elimination of virus compared with the 9 10 Mori et aJ. 5> succeeded in producing the meristem-culture method >· >. virus-free plant of strawberry 11 other species 190 JARQ Vol. 7, No. 3, 1973 1) M citeria,ls and 1nethods Table 1. Composition of the medium {mg/ Z) "Hokowase" was the strawberry cultivar {Linsmaier & Skoog 1965) used for this experiment. CaC11·2H20 440 MnS0,4H20 22. 3 A piece of runner tip, cut off in the length KH1PO, 170 Na1M00,•2H10 0. 25 of 1 to 2 cm, was washed in cresoli saponate KN01 1900 ZnSO, • H,O 8. 6 solution and after sterilization by immersing MgS0,•7H20 370 it into the supernatant solution of chlorinated NH, · NO, 1650 FeS0,•7H10 27. 8 lime (10 g of chlorinated lime and about 60% NaEDT A 37. 3 added to 140 cc of water ) for 10 to 15 minutes, C0Cl·6H10 0.025 the meristem tissue was cut into small pieces CuS0,·5H10 0.025 Thiamine-HCI 0. 4 of 0.1-0.5 mm (average 0.2-0.3 mm)-X· under a H,BO, 6.2 Sucrose 30,000 dissecting microscope and then these small KI 0.83 Agar* 7,000 pieces were put on the medium. * The original Linsmaier & Skoog medium has The medium was prepared by adding IAA, 10, 000 g of Agar NAA, 2.4-D and benzyl adenine (BA) to the base of Linsmaier & Skoog•>. (Table 1) Table 2. Effect of BA and Auxin concentrations on callus and shoot formation from meristem tissue Callus Callus No. of Soot formation Concentration substances No. of forma­ through callus Shoot forma­ direct formation added to the medium meri­ tion (B)tt tion shoot (C)b stems ratio ratio forma- (C/A) B A I A A N A A 24- D (A) + * (B/A) tions + * M M M M % % Expt. 1 0 0 0 0 JO 0 0 0 8 0 0 0 0 10-0 0 0 10 4 0 40 0 0 0 0 0 10- • 0 0 10 4 4 80 0 0 0 0 10-• 0 0 0 10 ] 9 100 0 3 5 80 10-• 10-, 0 0 10 4 6 100 0 2 2 40 10-• 10-• 0 0 10 4 6 100 0 2 2 20 Expt. 2 0 0 0 0 10 0 0 0 9 0 0 0 0 0 JO-G 0 10 6 2 80 0 0 0 0 0 0 10-• 0 10 4 6 100 0 0 0 0 10-• 0 0 0 10 1 9 100 0 4 5 90 10- • 0 10-• 0 10 0 10 100 0 3 2 50 10-• 0 10-• 0 10 1 9 100 0 2 2 40 Expt. 3 0 0 0 15 0 0 0 13 0 0 0 0 0 10-0 14 6 7 93 0 0 0 0 0 0 10- • 15 2 13 100 0 0 0 0 0 0 0 12 2 10 100 0 3 7 83 0 0 10- 0 12 3 9 100 0 0 0 0 0 0 10-• 15 0 15 100 0 0 0 0 a + : Number or test tubes containing the callus of which length is below 5 mm a -tt: Number of test tubes containing the callus of which length is over 5 mm b + : Number of test tubes containing 1 to 5 shoots b -tt : Number of test tubes containing more than 5 shoots * Mori et al (1969)9> reported that all the plantlets obtained from the meristem piece of 0.2- 0.3 mm were virus­ free and about half of the plantlets grown up from the meristem piece of 1.0 mm were also vi rus-free 191 The prepared medium was adjusted to (Fig. 1) but no callus appeared. pH 6.0 and a 7 to 8 cc portion of it was In the medium culture which contained poured into the 20 mm X 95 mm test tubes auxin or BA, callus formation was observed and autoclaved at a pressure of 1 kg/cm2, for frequently especially in the case of 10-•M BA 10 minutes. and the callus formation was flawless without The culture was incubated at 25°C under any exception. 12 hours illumination (3,000 lux) with fluores­ The basic medium culture containing cent lamps (plant lux) in a light-proof 10-sM BA showed also the best shoot formation chamber. with the ratio of 80 to 90 per cent and it was acclaimed a success. 2) Results A fragile callus of yellowish white color ap­ 1) Callus and shoot formation from meris­ peared at the end of two or three weeks after tem tissue the beginning of meristem culture with this Table 2 shows the results of experiments medium (Fig. 2). Then green spots were after eight to ten weeks from the beginning formed on the callus during the four to five­ of culture. The effects of IAA, N AA and 2.4-D week period and in the course of six to eight are shown in the columns of experiments 1, 2 weeks many shoots were discovered on these and 3 respectively. green spots. (Fig. 3) As to the culture with basic medium only, Auxin revealed inhibitory effect on the leaves developed and extended after two to shoot formation. four weeks from the commencement of culture, IAA and NAA reduced the ratio of shoot and plantlet grew up six to eight weeks later formation to one-half of the 10-•M BA and no Fig. 1. Shoot formation by usual meristem cul­ ture Fig. 2. Callus formation from a meristem tissue 192 JARQ Vol. 7, No. 3, 1973 shoot formation was noticed with the medium 2) Mass production method of shoot containing 10-lM 2.4-D or 10-6 M 2.4-D. through callus Shoot formation through callus which had been cultured repeatedly with the basic medi­ um containing 10-sM BA developed progres­ sively generation after generation as well as the case of the callus originated from anther tissue. Subsequently, the newly formed shoots were separated individually and were planted on the basic medium to procure normal straw­ berry plantlets. (Fig. 4) Thus, the mass production method of plant­ lets, more than 50 plantlets if needed, from only one meristem in terms of callus formation followed by shoot formation was fou nd to be possible. 3) Effect of the elimination of virus As for the virus infection of the plantlets formed from callus tissue, Svobodova (1964) ' 0 already reported that the plantlets raised separately through the callus which was formed from the potato tissue attacked by PVX, PVY, PVS were found virus-free. Mori (1971)0 > investigated the virus vicis­ situdes of plants by means of the fluorescent antibody method and reported that the virus concentration of the infected callus derived Fig. 3. Shoot formation through meristem callus from the plant tissue attacked by TMV is rather less than that of normal plants and _ _ll;-; Fig. 4-. Mass production of strawberry shoots through meristem callus 193 reveals unhomogeneous distribution in the Though only one plantlet had been obtained tissue according to the growth of callus under from one meristem by the conventional meri­ subculture.
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