000			038610000a22005170004500
999			_c71669 _d71669
003			CR-TuBCO
005			20221010160830.0
007			ta
008			151126b1972 xxu||||| |||| 00| 0 por d
040			_aCR-TuBCO _cCR-TuBCO _bspa
041			_apor
090			_aThesis _bC281e
100	1		_954170 _aCarletto, G.A.
110			_aIICA, San José (Costa Rica) _914
245	1	0	_aEstudo dos mecanismos determinantes de graus de autocompatibilidade em Theobroma cacao
260			_aTurrialba, Costa Rica _c1972 _bInstituto Interamericano de Cooperación para la Agricultura (IICA)
270			_aSan José, C.R.
300			_a40 páginas _b: 2 ilustraciones, 6 tablas _c21.59 x 27.94 cm.
500			_aIncluye sumario en español y portugués
502			_aTesis (Mag. Sc.) -- IICA, San José (Costa Rica), 1972
504			_aIncluye 25 referencias bibliográficas en las páginas 38-39
520			_aThe present study was carried out in order to prove Coral's proposal of the existence of degrees of selfcompatibility in cocoa, and at the same time to determine whether this phenomenon is regulated by the genetic mechanism of heredity or due to chromosomal abnormalities. In order to study the degrees of selfcompatibility, the studies of Knight and Rogers on the setting and abscission of the flowers and that of Cope on fusion and non-fusion of the ovules, were used as the base. In addition, a cytological study was carried out on the chromosome pairing in the formation of pollen and its normality in order to know its behavior in relation with the proposal. The results of the settings and abscissions were obtained through a diallelic cross between clones ICS-1, UF-667 and UF-29. The statistical analysis through the Chi exponent 2 test showed that the segregations in selfing adjusted to Coral's proposal, however when the results of the reciprocal crossings were observed, no adjustment to the theoretical expectation was found. Besides this, the results of the majority of the combinations also adjusted to the other segregations. It was also observed that the size of the sample was small and could be influencing the results. According to the tendencies observed for the Chi exponent 2 values, no evidence was found for Coral's proposal on the degrees of selfcompatibility. All the clones studied were selfcompatible and this condition was better explained by Knight and Roger's method than by Cope's. When the data on fusion and non-fusion of the ovules was analyzed in order to prove Cope's theory, it was found out that all three clones did not adjust to the theoretical expectation of 100 percent fusion and that they did adjust to the 3:1 proportion, that is, 25 percent of the ovules did not pair, thus not offering conditions to explain the degrees of selfcompatibility. The study on chromosomal pairing in the formation of pollen grains was made in metaphase I and that data revels that there exists no uniformity in the pairing not only in the selfcompatible clones but also in their hybrids with an incompatible parent. No relation was found between the abnormal pairing of chromossomes with the degrees of selfcompatibility and the normality of polen grains.
546			_aTesis escrita en portugués con resumen en inglés
650	1	4	_9166664 _aTHEOBROMA CACAO
650	1	4	_9150170 _aHEREDABILIDAD
650	1	4	_9167197 _aTRASTORNOS GENETICOS
650	1	4	_9142754 _aCROMOSOMAS
856	4	0	_uhttps://repositorio.catie.ac.cr/handle/11554/1895 _qpdf _ypor
901			_aF30
903			_aZ
903			_aV
903			_aE
903			_aU
904			_aBCO
904			_agleiva
904			_alorocu
905			_aC
906			_a19900101 _b20081020
907			_a000007713
907			_a000003570
907			_a000003217
907			_a000001598
908			_aB
942			_cTES _2z