Effect of the pollen in the physical and physiological characteristics of the papaya seeds

6 RESUMO - A ocorrencia do fenomeno xenia, considerado como o resultado do cruzamento que se manifesta na primeira geracao da planta mae, ha muito e conhecida. Entretanto, pouco e conhecido a respeito da contribuicao do efeito do polen no comportamento das sementes de mamao. Objetivou-se neste trabalho, avaliar a influencia do polen nas caracteristicas fisicas e fisiologicas das sementes de mamao. As sementes utilizadas foram provenientes de frutos dos grupos Solo e Formosa, oriundos de polinizacao manual, correspondente aos seguintes tratamentos: T1- Solo autofecundado; T2 - Formosa autofecundado; T3 - Solo x Formosa; T4 - Formosa x Solo; T5 - T3 autofecundado; T6 - T4 autofecundado. Foram realizadas as seguintes determinacoes e testes: numero de sementes por fruto, tamanho da semente, peso de mil sementes, testes de germinacao, primeira contagem, envelhecimento acelerado, comprimento da radicula, hipocotilo e teste de frio. O delineamento experimental utilizado foi inteiramente casualizado com quatro repeticoes, sendo as medias comparadas pelo teste de Tukey a 5% de probabilidade. Nao se verificou efeito da origem do polen nas caracteristicas fisicas das sementes. Para qualidade fisiologica das sementes nao foi possivel avaliar o efeito da xenia, uma vez que, observou-se a manifestacao precoce da heterose. ABSTRACT - The occurrence of the xenia phenomenon, considered the result of the crossing that is manifested in the first generation of the mother plant, has been known for many years. However, little is known regarding the contribution of the effect of the pollen to papaya seed performance. The objective of this study was to evaluate the influence of pollen on the physical and physiological characteristics of papaya seeds. The seeds used in the study were produced from hand pollinated fruits of the groups Solo and Formosa, corresponding to the following treatments: T1 - selfed Solo; T2 - selfed Formosa; T3 - Solo x Formosa; T4 - Formosa x Solo; T5 - Fruits proceeding from selfed T3; T6 - Fruits proceeding from selfed T4. The following determinations and tests were carried out: fruit weight, number of seeds per fruit, seed size, weight of a thousand seeds, seed germination,

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