-The present study evaluated the germination potential of seeds from eight peach tree rootstocks under different stratification methods, aiming at the production of high quality seedlings. In the first experiment, seeds with endocarp from eight genotypes ('Aldrighi', 'Capdeboscq', 'Flordaguard', 'Okinawa', 'Okinawa roxo', 'Tsukuba 1', 'Tsukuba 2', 'Tsukuba 3') were stratified on sand and moist vermiculite, at 7 ºC for 60 days. In the second experiment, endocarpless seeds of the same genotypes were stratified on Petri dishes at 7 ºC. In the third experiment, the time at which at least 75% of the seedlings reached transplanting height (15 cm high) was verified. The endocarp was a limiting factor for seed germination of the eight rootstocks, since the highest germination percentages were 21% and 48.3% for 'Aldrighi' and 'Capdeboscq', respectively. Germination of 'Okinawa' was only 19.2% and 4.2%, in sand and vermiculite, respectively. Seeds stratified without the endocarp, showed 100% germination, except for 'Flordaguard' and 'Tsukuba 2' and 3', with 93% germination. Seed mass presented a positive correlation with the germination speed index and the initial growth of the seedlings. 'Aldrighi' and 'Capdeboscq' presented more vigorous seedlings with greater growth in height, stem diameter, and Dickson quality index.

-This study aimed at determining and correlating the main morphometric characteristics of fruits and seeds with the germination potential and vigor of eight peach rootstocks. The experimental design was completely randomized, with four replications of 50 seeds per treatment. The analyzed variables were: length, width, thickness, fresh mass of fruit and seeds, moisture content of seeds, percentage of seeds attacked by fungi and intact seeds, germination percentage, germination speed index (GSI) and mean germination time (MGT). The Capdeboscq, Aldrighi and Tsukuba 1 cultivars showed higher values of length, width, thickness and fresh mass of seeds compared to other cultivars, presenting a relationship with the later period of fruit ripening. Regardless of the fruit ripening time, the germination percentage was high, ranging between 93% and 100% for all cultivars. In addition, the fresh mass of fruits has showed a high positive correlation with the fresh mass of seeds for the eight evaluated peach rootstocks. The GSI and MGT have a high relationship with the fresh mass of seeds.Index terms: Rosaceae, morphobiometry, seeds, cultivars, peach.Correlação de características biométricas de frutos e sementes com a germinação e vigor de porta-enxertos de Prunus persica RESUMO -Objetivou-se determinar e correlacionar as principais características morfométricas de frutos e sementes sobre o potencial de germinação e o vigor de oito porta-enxertos de pessegueiro. O delineamento experimental foi inteiramente casualizado com quatro repetições de 50 sementes por tratamento. As variáveis analisadas foram: comprimento, largura, espessura, massa fresca dos frutos e sementes, grau de umidade de sementes, porcentagem de sementes intactas e infectadas por fungos, porcentagem de germinação, índice de velocidade de germinação (IVG) e tempo médio de germinação (TMG). As cultivares Capdeboscq, Aldrighi e Tsukuba 1 apresentaram maiores valores médios de comprimento, largura, espessura e massa fresca de sementes comparados com as demais cultivares, apresentando relação com o período mais tardio de maturação dos frutos. Independente da época de maturação dos frutos, a porcentagem de germinação foi alta variando entre 93% e 100% para todas as cultivares. Somado a isso, a massa fresca do fruto apresenta alta correlação positiva com a massa fresca das sementes dos oito porta-enxertos de pessegueiro avaliados. O IVG e o TMG possuem alta relação com a massa fresca das sementes.

It was to aimed it to investigate effects of various saline water use strategies on melon production and quality of two cultivars (Cucumis melo L., Sancho -C 1 and Medellín -C 2 . The plants were irrigated with water of low (S 1 = 0.61 dS m -1 ) and high (S 2 = 4.78 dS m -1 ) salinity levels, during each crop stage: S 1 S 1 S 2 S 2 -T 1 ; S 2 S 1 S 2 S 2 -T 2 ; S 2 S 2 S 1 S 2 -T 3 . The 1 st , 2 nd , 3 rd and 4 th terms of these sequences correspond to initial growth, flowering, fruit ripening and harvest phenological stages, respectively. Additionally, there was irrigation rotation during all cycle, with water S 1 during two days followed by S 2 for one day (S 1 2 dias + S 2 1 dia -T 4 ) and irrigation with non-salt water S 2 during all cycle -T 5 . Moreover, we used as control, the irrigation water at 3.2 dS m -1 resulting from water mixture of S 1 and S 2 -T 6 (farm used irrigation management). The experiment was carried out in Pedra Preta Farm, in Mossoró, RN, using an entire randomized block statistical design in a 6x2 subdivided plot scheme with four replications. Saline water irrigation at initial growth stage reduces leaf area and shoot dry phytomass of Sancho and Medellín melon cultivars. The irrigation by T 4 provided the highest phytomass production of fruits at 48 DAS, reducing in 33% of good quality water in irrigation. KEYWORDS:Cucumis melo L., irrigation water quality, growth analysis ESTRATÉGIAS DE MANEJO DE ÁGUA SALINA SOBRE AS CARACTERÍSTICAS MORFOMÉTRICAS DE CULTIVARES DE MELÃORESUMO: Objetivou-se investigar os efeitos de diferentes estratégias de uso de água salina na produção e na qualidade de frutos de duas cultivares de melão (Cucumis melo L., Sancho -C 1 e Medellín -C 2 ), irrigadas com água de baixa (S 1 = 0,61 dS m -1 ) e de alta (S 2 = 4,78 dS m -1 ) salinidades, por fase da cultura: S 1 S 1 S 2 S 2 -T 1 , S 2 S 1 S 2 S 2 -T 2 , S 2 S 2 S 1 S 2 -T 3 (o 1º, 2º, 3º e 4º termos dessas sequências correspondem, respectivamente, às fases fenológicas crescimento inicial, floração, maturação dos frutos e colheita) e a irrigação alternada, em todo o ciclo, com água S 1 por 2 dias, seguido por água S 2 por um dia (S 1 2dias + S 2 1dia -T 4 ) e irrigação com água S 2 em todo o ciclo -T 5 ; além disso, uma testemunha, a irrigação com água de 3,2 dS m -1 resultante da mistura das águas S 1 e S 2 -T 6 (manejo adotado pela fazenda ). O experimento foi conduzido na Fazenda Pedra Preta, no município de Mossoró -RN, utilizando o delineamento em blocos inteiramente casualizados, em um esquema de parcelas subdivididas 6 x 2, com quatro repetições. A irrigação com água salobra, logo na fase inicial de crescimento, reduz a área foliar e a fitomassa seca da parte aérea das cultivares de melão Sancho e Medellín. A irrigação do T 4 proporcionou a maior produção de fitomassa de frutos de melão aos 48 DAS, reduzindo 33% de água de boa qualidade na irrigação.

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