Physiological quality of Araucaria angustifolia seeds at different stages of development
There are few studies on the best time to collect seeds of Araucaria angustifolia in order to prevent immature and/or non-viable collections and obtain seeds with maximum viability and vigour. This study aimed to assess physiological changes during maturation stages of A. angustifolia seeds. In the months of April, May, June and July, seeds of A. angustifolia were collected and classifi ed as stage I, II, III and IV, respectively. It was found that at stage I, the seeds had 56.3% moisture content, which decreased sharply at stage II (48.2%) but remained stable at the other stages. Higher germination (98%) and shoot length (21.8 cm) were observed at stage IV, coinciding with the smallest dimensions (length, width and thickness) of the seeds. Although moisture content remained stable after stage II, seeds showed increases in GSI, first count, radicle length and shoot length at stages III and IV. It was concluded that there are differences in viability and vigour across the maturation stages of seeds of Araucaria angustifolia. Premature collection, at stage III, may be acceptable since there is high germination, high first count germination and electrical conductivity was low.
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Document Type: Research Article
Publication date: August 1, 2013
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