COMPARISON OF METHODS TO EVALUATED PHYSIOLOGICAL AND HEALTH QUALITY IN MELON SEEDSABSTRACT -The objective of this study was to evaluate the efficiency of different vigour tests in the identification of vigour levels and health quality of melon seeds (Cucumis melo L.). Four seed lots of the Gaúcho and Carvalho cultivars produced in Hulha Negra-RS were evaluated. Seeds were submitted to the germination tests, first germination counting, field emergency, controlled deterioration, accelerated aging test, seedlings vigour classification, cold vigour test and health test. Results indicated that the controlled deterioration and accelerated aging tests presented enough sensitivity for evaluating physiological potential melon seeds but evaluation of seedlings tests did not show enough sensitivity to accomplish a classification of lots. Aspergillus ssp. and Fusarium oxysporum were detected in seeds and showed height correlation with dead seeds in vigour tests.
-NOTA - RESUMO (McDONALD, 1998; MARCOS FILHO,1999). O objetivo do trabalho foi avaliar a eficiência de diferentes testes na identificação do nível de vigor e da qualidade sanitária de lotes de sementes de melão (Cucumis melo L.). Foram avaliados quatro lotes de sementes das cultivaresAs sementes são eficientes meios de disseminação e transmissão de patógenos e freqüentemente, introduzem novos patógenos em áreas isentas. O inóculo inicial da epidemia pode depender da transmissão do patógeno pela semente e a presença de patógenos pode também, reduzir a qualidade fisiológica das mesmas, indicada pela germinação e pelo vigor. Recomenda-se, portanto, que haja uma integração entre os testes de sanidade e de qualidade fisiológica de sementes (NEERGAARD, 1979;MENTEN , 1995).Pelo exposto, o objetivo do presente estudo foi avaliar o vigor de lotes de sementes de melão (Cucumis melo L.) utilizando diferentes testes, avaliando sua sensibilidade para identificação de diferenças entre níveis de vigor dos lotes de sementes, bem como estudar a qualidade sanitária das sementes.
Butternut pumpkin is a cucurbit species of great economic and social importance for the Northeastern Region of Brazil. About 500 accessions are maintained in the Active Germplasm Bank of Embrapa Tropical Semiarid. This great potential for agricultural production has stimulated research on the characterization and study of the species' divergence, with a view to identify promising preserved accessions for breeding programs. The purpose of this study was to detect similarity groups among the 73 C. moschata accessions from the above-mentioned Cucurbit Germplasm Bank. Seed descriptors were used to observe the relationship between collection site and formation of divergent groups. Twenty-four seeds per accession and six multicategorical descriptors were used to generate a Jaccard similarity matrix and an UPGMA dendrogram. The formation of two major groups with four subgroups each, with a minimum phenotypic similarity of 31.5% and 35.8%, respectively, was observed. In conclusion, wide variability and no relationship between site collection and phenotypic similarity were observed among the accessions.
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