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Accueil du site → Master → Etats Unis → 1972 → Effects of fruit maturity and after-ripening of seeds upon seed germination and viability in Cucurbita foetidissima HBK

University of Arizona (1972)

Effects of fruit maturity and after-ripening of seeds upon seed germination and viability in Cucurbita foetidissima HBK

Alves Costa, José Tarciso

Titre : Effects of fruit maturity and after-ripening of seeds upon seed germination and viability in Cucurbita foetidissima HBK

Auteur : Alves Costa, José Tarciso,

Université de soutenance : University of Arizona

Grade : Master of Science (MS) 1972

Résumé
Fruit maturity and its effect on the morphological and physiological development of the seed, in the range of 20 to 38 days from pollination, were investigated in the wild xerophytic gourd. Cucurbita foetidissima HBK. Also, the influence of a 20 day period of fruit storage on the seed development was studied„ Fruit size and seed number per fruit were not influ- ’ enced by fruit age. However, a linear positive association was found between fruit size and its number of seeds. A marked and positive effect of fruit.age on seed weight was also observed. It appeared that the complete physical seed development was reached by the 38th day from pollination. Fruit storage had little effect on seed weight when compared to the influence of fruit age. Both the stage of fruit maturity and the period of fruit storage had marked effect on seed germination and viability. Possible mechanisms through which they influence seed germination and viability were discussed. The seedlings after the germination period were classified according to their degree of development, and it was found that the highest percentage of well-developed seedlings was recorded for the 38 day old fruits, stored for 20 days after harvest.

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