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Diversity in the Wild Potato Species Solanum Chacoense Bitt

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Diversity in the Wild Potato Species Solanum Chacoense Bitt Euphytica 37:149-156 (1988) @ Kluwer Academic Publishers, Dordrecht -Printed in the Netherlands Diversity in the wild potato species Solanum chacoenseBitt. SusanA. Juned,M. T. Jacksonand JanetP. Catty Department of Plant Biology, University of Birmingham, P.O. Box 363, Birmingham B15 2TT 25 November 1986; accepted in revised form 13 March 1987 Key words: Solanum chacoense,potato, wild species, diversity, multivariate analysis, isozymes, allozyme variation, in situ conservation Summary The morphologicat and isozyme variation was studied in 22 accessionsof Solanum chacoensefrom Paraguay and Argentina. Clear geographic groups were identified through the use of multivariate analyses. S. chacoensefrom mountain sites in Argentina could be readily distinguished from plains forms from Paraguay, on the basisof severalcorrelated morphological characters. Three isozyme systems,namely phosphoglucose isomerase (PGI), glutamate-oxaloacetate transaminase (GOT) and peroxidase (PRX) were studied using starch gel electrophoresis. The banding patterns indicated that for each isozyme there were several loci, which were polymorphic. A genetic interpretation of one of the PGI loci was made, and indices of genetic diversity and genetic identity calculated. Principal components analysis, cluster analysisand genetic diversity indicated a close relationship between the geographicalgroups. Theseresults are discussedin the context of in situ genetic conservation. Introduction through gene introgression from speciesof higher altitudes, such as S. microdontum (Hawkes & Solanum chacoenseBitt. is considered by Hawkes Hjerting, 1969). & Hjerting (1969) to be the commonest, most ag- This apparant introgression of alien germplasm gressiveand most adaptable of the South American has enabled S. chacoenseto extend its range of wild potato species. It is found in Argentina, Para- biotypes and become adapted to a wider range of guay, Uruguay and south-eastern Brazil, with ecological conditions. Hawkes & Hjerting (1969) some extension into central Bolivia, covering a proposed that a varied series of S. chacoense-like wide range of phytogeographical regions and alti- biotypes were formed in the comparatively recent tudes. It has been suggestedthat S. chacoensewas past which, through natural selection, were able to once a native speciesof a much more limited area colonise new areasgiving rise to a situation where- but that it has extended its range of habitats so that by a distinct series of forms exists, differing from it now occurs as a weed of fields, of roadsides and the typical S. chacoense,yet linked by connecting waste places (Hawkes & Hjerting, 1969). An ex- intermediate forms. Although distinct, no constant tensive altitude range is now covered by the species combination of characters defines the biotypes or between sea level and 2400m (Hawkes, 1978), but micrQspeciesadequately. A well-marked pattern it may have once been limited to the plains and low of variation has apparently arisen, only part of foothill areas (to 1000 m), with an increase in the which can be explained by introgression, with char- altitude range by secondary extension acquired acteristic regional forms evident in the north-west Received 150 mountain regions of Argentina, distinct forms in larger amounts of data to be handled and analysed the Cordoba and San Luis provinces of Argentina, more thoroughly. However, only the expressed the more 'typical' form in the plains areas, and a part of the genome canbe measured. The contribu- variety of intermediate linking forms in the areas in tion of individual genescannot usually be detected, between. nor can it be ascertained to what extent they vary Although S. chacoensehas a wide geographical between individuals. The study of rare characters range, the largest number of collections has been or the study of a range of more common character- made in Argentina, particularly in the north-west- istics governed by many genes that cannot be rec- ern provinces that are the most important regions ognised individually or separated from environ- for wild potatoes. Many of these provinces are mental influence has been the usual method of the mountainous with a great range of climatic and population geneticist (Gottlieb, 1981). In this pa- ecological conditions. S. chacoenseis found here in per, we report the results of a study of the morph- a very wide range of habitats. ological and isozyme variation in S. chacoensefrom Hawkes & Hjerting (1969) and Hawkes (1978) Paraguay and Argentina, and the relationship ;be- concluded that the morphological variation observ- tween geographical distribution of the speciesand ed in S. chacoense,particularly that between the its genetic diversity. plains and mountain forms, is largely genetically determined, with the maximum amount of var- iation to be found in the mountain regions. The Materialsand methods taxonomy of S. chacoenseis well understood, but details of its genetic diversity have not been stud- Five seeds each of 22 accessionsof S. chacoense ied. Wide genetic diversity is of great interest to :(T&bj,e1) were germinated under sterile condi- plant breeders, and S. chacoensehas itself attracted tions, after surface sterilisation with 2% sodium interest becauseof its reported resistance to more hypochlorite. Seedlingswere grown in vitro on Mu- than 20 pests and diseases(Hawkes & Hjerting, rashige minimal organic medium plus agar (0.8%) 1969). and sucrose(2.0%), pH adjusted to 5.6. Once they Wild potatoes are normally conserved as true were well established in culture, the young seed- seed accessionsin gene banks. However, it is be- lings were subcultured to provide identical geno- coming increasingly clear that the in situ genetic types both for the study of morphological variation conservation of wild speciesshould also be consid- in the screenhouse, and for the electrophoretic ered, so that evolution can continue. This is 'dy- study of isozymes. namic conservation' (Guldager, 1975) as opposed to 'static conservation' in gene banks. The problem Multivariate analysis. After weaning off culture is to determine which populations of a species medium, young plants were transplanted to pots in should be conserved in situ, based on studies of the screenhouse, in a randornised complete block genetic diversity within species. design with five replicate plants per accession,each The components of genetic diversity include the group of five plants designated as a family. A total kinds and numbers of alleles present, the hetero- of 19 characters was measured, listed in Table 2, zygosity, and correlation of alleles present between and standardised between plants. loci (Brown, 1978). Consequently, the extent of The data were analysed by principal components genetic diversity is difficult to assessaccurately. An analysis (PCA) and cluster analysis (euclidean dis- ideal method would be the direct study of DNA in tance plus Ward's method) using the Clustan 2 speciespopulations, but until this is fully possible, package (Wishart, 1978). Only 16 of the characters other methods have to suffice. were used in these analyses.Ratios were included, Morphological polymorphisms have been exten- but only one of the component values of eachratio sively used to study diversity. The methods of nu- was used. merical taxonomy using computers have enabled Starch gel electrophoresis. Plant material from in pH, as well as empirically determining the strength vitro culture is ideal for use in starch gel electropho- and duration of the electric field to be used for the resis of isozymes. It is tender and easyto macerate, different combinations of isozyme, buffer and and furthermore, in vitro culture can be used to starch concentration. Three isozyme systems, provide a steady supply of plant material of the namely phosphoglucose isomerase (PGI), gluta- same genotype and of more or less the same age. mate-oxaloacetate transaminase (GOT) and per- Although sampling of leaves, petioles and stems oxidase (PRX) were chosenfor study becausethey from single plants gave similar isozyme banding gave consistent results and required the same gel patterns, only new leaf growth was used for com- and electrode buffers. Recipes and electrophoresis parative analysis between genotypes, since tissue conditions were those recommended by Shaw & specific differences have been reported (Van Den Prasad (1970), Rick et al. (1977), Shields et al. Berg & Wijsman, 1981). Pollen for isozyme study (1983) and Vallejos (1983). was obtained from fully, but freshly opened flow- Sampleswere extracted in O.lM Tris buffer (pH ers. 7.2) with the addition of 50ILIof2-mercaptoethanol In order to obtain consistent and reliable sep- per 50ml of the final volume. Up to 25 samples arations of isozymes it was necessaryto undertake were run in each gel, and extracts of S. tuberosum a preliminary screening for buffer systems, starch cv. Maris Piper were included as a reference con- concentrations, staining recipes and variation in trol. Electrophoresis was carried out in 12.8%, Table 1. Provenance data for Solanum chacoenseaccessions used in this study. Family Country2 Province Department Altitude (m) Collectors'No. 0502 3 PAR clOO Bordas 0506 5 PAR clOO Bordas2A 0496 7 PAR clOO Bordas 0572 9 PAR clOD Bordas 0426 13 PAR clOD Bordas 0505 19 PAR clOO Bordas 0509 21 PAR clOO Bordas4 0445 12 ARG Jujuy Capital 1750, HP&R56 0439 15 ARG Jujuy Capital 1750 HP&R56 0353 16 ARG Jujuy Tilcara 2300 P & H P-349 0564 2 ARG Salta Guachipas 1100 HH & R3629 0412 8 ARG Salta Guachipas c1100 3049 17 ARG Salta Ch~coana 2400 HH & R3706 0570 18 ARG Salta Chicoana 1700 HH & R3700 0519 20 ARG Salta Chicoana 1500 HP & R295 0565 4 ARG Cordoba Punilla 1550 HHO & R3297 0562 10 ARG Cordoba Punilla 850 HH & R3305 0544 14 ARG Cordoba SanJavier 650 HH & R3198 0561 22 ARG Cordoba Cruz de Eje 1700 HH & R3327 05520559 1 ARG SanLuis Chacabuco 900 HH & R3194 6 ARG SanLuis La Capital 900 HH & R3163 0525 11 ARG SanLuis La Capital 850 HH & R3158 1 University of Birmingham Potato Germplasm No. 2 PAR Paraguay; ARG Argentina. 151PGNo.! 152 starch gels with a Tris-citric acid buffer (pH 7.8), at ences between families for all characters ecxept a constant current of 20mA for 51/2hours at 40C in leaflet length.
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