The aim of this work was to study the phenology and fruiting characteristics of B. buxifolia Lam. at Tierra del Fuego, Argentina. One-year-old shoots had significantly more and heavier fruit than older ones. The orientation, height position, and age of shoots significantly affected the shrub productivity. The highest relative number of fruiting shoots, fruit number and fruit weight were found on the northern side of shrub, followed by eastern, western and southern orientations. The relative number of fruiting shoots, fruit number and fruit weight were higher in the upper half of the plant. One-year-old fruiting shoots were significantly higher than 2- and 3-year-old shoots. Likewise, the relative fruit number and fruit weight were significantly higher on 1-year-old than older shoots.
SummaryIn Argentina, different areas are suitable for seed potato production: however, each has particular problems, mainly related to different pest and diseases. Tierra del Fuego Island is well isolated from traditional potato growing areas. Therefore, it was tested for its potential for seed production.The cultivars Achatt, Mail6n INTA, Pampeana INTA and Spunta were grown in Rio Grande, San Pablo and Ushuaia from 1991-1994. Nematode presence and aphid population dynamics were recorded. Average tuber yield ranged from 20.1-37.6 t ha -1. After three years PVY and PLRV remained low (0-1% for different cultivars and locations). Moreover. seed tubers obtained were physiologically young. Long days, early frosts and strong winds may limit tuber yield in some years. The island can be considered as an ecological "'safe haven" and is very suitable to obtain healthy and physiologically adequate seed potatoes.
Pernettya mucronata (Ericaceae) is a Fuegian species from Argentina. The present work was carried out to study the effects of increasing stratification times as well as the effects of light and dark on germination.The percentage germination at 60 days was significantly higher in the light (45.6%) than in the dark (29.4%). The percentage germination at 60 days was also significantly higher after a 300 h chilling pretreatment (40.4%) compared with that of unstratified seeds (22.0%).Stratified seeds, germinated either in the light or in the dark, attained the maximum percentage germination at 20 days after the beginning of germination. Unstratified seeds attained the maximum percentage germination at 30 days.
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