Época de colheita e período de repouso dos frutos de mamão (Carica papaya L.) cv Golden na qualidade fisiológica das sementes

Abstract

RESUMO Este trabalho teve como objetivo verificar a influência da época de colheita e do período de repouso dos frutos na qualidade fisiológica de sementes de mamão. Os frutos, produzidos no inverno e no verão, da cv Golden (0, 2, 4, 6, 8, 10 and 12 days) and after storage of the seeds for 30 days at 15ºC. The experimental design used was a completely randomized arrangement in 2x7x2 factorial scheme with four replications. The treatments of the factorial consisted of the combination of two fruit harvest times (September and January), eight rest periods of the fruits (0, 2, 4, 6, 8, 10 and 12 days) and two periods of evaluation of seed storage (0 and 30 days). There were variations in the humidity and dry matter of the seeds during the rest and harvesting of the fruits. The best vigour of the seeds occurred around 12 days of fruit rest, independent of seed storage. The rest period of the fruit contributed to increase the seeds germination, to the harvested fruits in January the maximum germination of the seeds was evident at the rest period inferior (9 to 12 days) to the fruits harvested in September (13 days).

Chemical treatment of papaya seeds aiming at long-term storage and control of damping off

“…The potential for seed germination was not increased with the fungicide treatment and the storage, contradicting the conclusions of Aroucha et al (2005), who found that the storage of papaya seeds for 30 days increased the percentage of germination.…”

Polyethylene glycol effects on somatic embryogenesis of papaya hybrid UENF/CALIMAN 01 seeds

“…Their exact function is still unknown, but studies have shown that they are related to the protection of cellular or molecular structures from damage, which may result from water loss during the desiccation of the seed (Goyal et al 2005). Aroucha et al (2005), working with papaya seeds of the Golden and Taining 01 cultivars, found that recently collected seeds, regardless of the state of maturation of the fruits, displayed low initial germination, making the storage period necessary for seed germination.…”

Germinação e vigor de sementes de mamão (Carica papaya L.) cv. Golden secadas em altas temperaturas

“…Além disso, é maior a probabilidade de se obter lotes pouco homogêneos quanto à qualidade, quando a secagem é realizada sem que haja controle efetivo das variáveis envolvidas no processo. Quando a secagem não é realizada ao sol ou à sombra, empregam-se estufas com circulação forçada do ar, em que o único parâmetro controlado é a temperatura (Viggiano et al, 2000b;Aroucha et al, 2005;Tokuhisa et al, 2007).…”