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T. ,GOREA şi MARrNA ·GOLOGAN, Resinteza treptei itetraploide.<br />

61<br />

JOHNSTONE Fi. E., 1939, Chromosome Doubling in Potatoes Induceel by Colchi"<br />

cine Tr;eatment. Amelt Pobatto J. 16.<br />

ROTHACKER D., FIEDLER H., 1957, Die Erzeugung polyploider Kartoffelpflanzen<br />

nach der Propfcolchicinierungsmethode, Zikh:ber, 27..<br />

ROTHACKER D.; SCHĂFER GUDRUN, 19611, Einige Untersuchungen ilber haploide<br />

Pflanzen. von Solanum tuberosum. ZucbiJe:r, 7.<br />

ROTlHl\CKER D., 1968, Einige Moglichkeiten und die Problematik eler Erzeugung<br />

und Verwundung clihaploieler Kartoffeln fur die Zilchtung. Ta:gunsbedcnte<br />

DAL. zu Berlim<br />

ROSS R W., DIONNE L. A., HOUGAS R VV.,<br />

Number of Selectecl Solanum Genotypes,<br />

1967, Doubling the Chromosome<br />

RO\VE P. R., 1967 la, Performance of Diploid ancl Vegetatively Doubled Clones<br />

of Phur-eja-haploid Tuberostlim Hybriels. Armer.P,otarto J., 6.<br />

ROVIlE R P., 1967 b, Performance anel variability of Diploiel and Tetraploid Potato<br />

Families. Amer. Pofurto J., 8.<br />

SNO\V R, 1963, Alkoholic Hyel7'ochloric Acid Carmine as a Stain Method for<br />

Chromosomes Squash Preparations. Stein. T:eih:noil.., 38.<br />

STELZNER G' I<br />

1941, Colchizin induzierte Polyploridie bei Solunum tuberosmn L.<br />

Ziichter, 13.<br />

YE.H B. P., PELOQUIN S. J., .11965, Colchicine-cloubled Solanum Hybriels between<br />

24 Chromosome Species and Haploids of the Cultivatecl Potâto. Agr. Abstr.<br />

RESYNTHESIS OF TETRAiPIJOID STAGE OF DIHAPLOl1D POTATO FORMS<br />

CREAiTED BY STIMULAT\E!D HAPLOPARTHENOGENESIS<br />

SUMMARY<br />

Certain aspeets concerning tetraploidization of dihaploid potato forms by<br />

col,chici:ne treat:men.t were studied. From me'thodologk poimt of wiew it was established<br />

that sprouttreatment resulted in a higher numheil' of polyploide growing<br />

tips as compared to the 'tre.a::mlent ofaxiilary meit"listems. Maximum polyploidization<br />

effect w,as obtai:neid wi'th a colchircine soluibio:n of. 0.2-0.5 alPplied for<br />

42-72 hours as 'el fUI1Iction ofgenertical stru:eture of genotype. Besides ,the tetraploird<br />

forms, the co.lchidne tr{:~atment ireSiulted in ,a 'compilete sedes of peridinal<br />

chdmaera (2 n = 2 3 = 8). Polyploidization iresulted in the modificaition of mai!;!<br />

morphalog.itCial char.aders of diihalpiloid forms whose aSlped belc'ame tipicalJy tetraiploJd;<br />

tuber yield i:nc~eased very much on ,account of t'Uibe:r sine inlare:lse<br />

maiilllly in the second vegetative igenera1tion. Numheil" of tuibers was affected in '3<br />

smallerextent by the mod,ifkationl of ploidY leivpl.<br />

DIE NtEiUSY:NiTBlErT,ISIERUNG DER TETRAiPLOIDEN 'STUFE DER<br />

DIHAPLOIDF1N KARTOFFLELFORMEN DlLE DURCH SIMULIERTE<br />

HA,PLOPARTHOGEiNESE GESCHAFFEN WURDEN<br />

ZUSAMlVIE..~FA:SSUNG<br />

Es wurden einige As;pek-te rde:r Tetrap[oidierun.g cler dihaplolden Ka!'toffelfornnen<br />

dureh \Behandlu:ng mirt KoJlcnizin, experime:ntiert.<br />

Vom methodologisahen Sta:nidpu:nrktauis wurde es feiStgeste[ilt dass di:e Behtandlung<br />

der Keimlinge einegrossere Zahl pOilYipllo!ildi,zierten Ve.getationsp-unMe<br />

als di·e Behanld[uiil;g deT axiUaren Biilidunigsgewebeergi:bt. Der hochste Effekt der<br />

- 0,5 wăhre:nd 42 - 72 Stuntlen, in Verhăltnîs zur genetisdhen StrrukJtlur des Genotypus,erzielt.<br />

Infolge der Behan!d.lun,g erschie.nen ausser den voll tetralp[oiidisier-

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