Submitted by Jos? Henrique Henrique (jose.neves@ufvjm.edu.br) on 2022-09-14T19:07:22Z No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) claudilene_aparecida_alves_pena.pdf: 1040318 bytes, checksum: 338fcf85433e09d8d998ec57e4975593 (MD5) Approved for entry into archive by Jos? Henrique Henrique (jose.neves@ufvjm.edu.br) on 2022-09-14T19:25:55Z (GMT) No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) claudilene_aparecida_alves_pena.pdf: 1040318 bytes, checksum: 338fcf85433e09d8d998ec57e4975593 (MD5) Made available in DSpace on 2022-09-14T19:25:55Z (GMT). No. of bitstreams: 2 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) claudilene_aparecida_alves_pena.pdf: 1040318 bytes, checksum: 338fcf85433e09d8d998ec57e4975593 (MD5) Previous issue date: 2022 Os programas de melhoramento gen?tico do eucalipto est?o em constante aprimoramento, visando obter caracter?sticas desej?veis. Ap?s a sele??o da ?rvore que apresenta a caracter?stica de interesse, as etapas seguintes s?o o resgate vegetativo ou clonal e a produ??o de mudas a partir das brota??es. A intera??o gen?tipo-ambiente e o m?todo de resgate s?o alguns dos fatores que podem afetar a produ??o de brota??es, o enraizamento e a qualidade das mudas. Este trabalho objetivou avaliar o resgate clonal em campo de 14 clones de Eucalyptus spp. por duas t?cnicas de corte raso para resgate de brota??es em dois tempos. Para avaliar a emiss?o de brota??es adotou-se o delineamento em blocos casualizados, em esquema fatorial 14x2x2, sendo: 14 Clones, e resgate via corte raso a 10 e 90 cm de altura nos dois tempos 90 e 120 dias ap?s a resgate das brota??es, com quatro blocos por tratamento. Aos 90 e 120 dias ap?s a resgate das brota??es foram avaliados o n?mero de brota??es com mais de 10 cm e altura m?xima das brota??es. Na etapa de produ??o de mudas adotou-se o delineamento em blocos casualizados, em esquema fatorial 14 x 2 (14 clones e duas t?cnicas de resgate clonal em corte raso), com 5 blocos de 88 estacas. Aos 90 dias ap?s o estaqueamento, avaliou-se o percentual de sobreviv?ncia, altura de plantas, di?metro do coleto, massa seca da parte a?rea e das ra?zes e ?ndice de qualidade de Dickson (IQD). Com rela??o ? emiss?o de brota??es, os clones apresentaram diferencia??o quanto ao n?mero de brota??es, independentemente da t?cnica de resgate, obtendo brota??es com altura m?xima m?dia de 53,37 cm. Os clones 01 e 09 foram os mais recalcitrantes ? forma??o de brota??es e apresentaram menores alturas. Os clones 03 e 09 diferiram estatisticamente quanto ao m?todo de resgate empregado, apresentando maior n?mero de brota??es no m?todo de corte a 90 cm. O tempo de coleta das brota??es influenciou significativamente, obtendo-se maior quantidade e brota??es de maiores alturas aos 120 dias. Na produ??o de mudas, o clone 24, h?brido controlado de E. urophylla x (E. camaldulensis x E. grandis), embora tenha obtido alto percentual de sobreviv?ncia, apresentou mudas com um dos menores IQD. Os h?bridos de E. grandis x E. pellita (clones 01 e 09) tiveram os menores percentuais de sobreviv?ncia. O clone 20, (E. camaldulensis x E. grandis) x E. urophylla, independentemente do m?todo de resgate utilizado, foi um dos que apresentou mudas de melhor qualidade. O fator gen?tico (clone) teve maior influ?ncia na sobreviv?ncia e qualidade das mudas do que o m?todo de resgate. Disserta??o (Mestrado) ? Programa de P?s-Gradua??o em Ci?ncia Florestal, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 2022. Eucalyptus genetic improvement programs are constantly being improved in order to obtain desirable characteristics. After the selection of the tree that presents the characteristic of interest, the following steps are the vegetative or clonal rescue and the production of seedlings from the shoots. The genotype-environment interaction and the rescue method are some of the factors that can affect shoot production, rooting and seedling quality. This study aimed to evaluate the field clonal rescue of 14 clones of Eucalyptus spp. by two clear-cutting techniques to rescue shoots in two stages. To evaluate the emission of shoots, a randomized block design was adopted, in a 14x2x2 factorial scheme, being: 14 Clones, and rescue via clear cut at 10 and 90 cm in height at the two times 90 and 120 days after the rescue of the shoots, with four blocks per treatment. At 90 and 120 days after shoot rescue, the number of shoots with more than 10 cm and maximum shoot height were evaluated. In the seedling production stage, a randomized block design was adopted, in a 14 x 2 factorial scheme (14 clones and two clonal rescue techniques in clear cut), with 5 blocks of 88 cuttings. At 90 days after staking, the percentage of survival, plant height, collar diameter, shoot and root dry mass and Dickson quality index (DQI) were evaluated. Regarding the emission of shoots, the clones showed differentiation in terms of the number of shoots, regardless of the rescue technique, obtaining shoots with an average maximum height of 53.37 cm. Clones 01 and 09 were the most recalcitrant to shoot formation and had the lowest heights. Clones 03 and 09 differed statistically in terms of the rescue method used, showing a higher number of shoots in the 90 cm cut method. The time of collection of shoots influenced significantly, obtaining a greater quantity and shoots of higher heights at 120 days. In seedling production, clone 24, a controlled hybrid of E. urophylla x (E. camaldulensis x E. grandis), although it obtained a high percentage of survival, presented seedlings with one of the lowest IQD. E. grandis x E. pellita hybrids (clones 01 and 09) had the lowest survival percentages. Clone 20, (E. camaldulensis x E. grandis) x E. urophylla, regardless of the rescue method used, was one of the ones that presented better quality seedlings. The genetic factor (clone) had a greater influence on seedling survival and quality than the rescue method.