Abstract
Germination of diaspores and the seedling structure of Ruprechtia laxiflora Meissn. (Polygonaceae) which is a secondary species frequent in forest remnants are described. Seedlings were embedded in hydroxymethacrylate and sectioned in a rotary microtome according to usual techniques in plant anatomy. For bioassays of germination, the experimental design was completely randomized in a 3x2 bifactorial arrangement, corresponding to three temperatures (20, 25 and 30°C) and two light conditions (photoperiod and continuous darkness) for the diaspores newly harvested and in a 4x2 bifactorial arrangement, corresponding to four temperatures (15, 20, 25 and 30°C) and two light conditions (photoperiod and continuous darkness) for diaspores analyzed after storage. There was no interaction between the factors light condition and temperature for germination parameters analyzed. However, the temperature affected the germination and diaspores maintained at 25°C showed a shorter mean time and higher germination speed index. Seedlings are phanerocotylar and epigeal with tetrarch root, intermediate-low type of root-stem transition and trilacunar cotyledonary node.
Highlights
In forest remnants of the Northwest region of Paraná, Brazil a diversity of species occurs, belonging to different families
Considering the temperature alone, it had an effect on mean germination time (MGT) and speed of germination index (SGI) (p ≤ 0.05)
With regards to the MGT, the diaspores subjected to 25°C exhibited faster germination and lower SGI values were
Summary
In forest remnants of the Northwest region of Paraná, Brazil (less than 1% native vegetation) a diversity of species occurs, belonging to different families. (Polygonaceae) is frequent in these forest remnants in which the germination of seeds and seedling structure still has not been investigated. Ruprechtia laxiflora, known as quince, ‘viraró’, quince-brave or the wood-quince, is an arboreal plant, light-demanding, secondary and. Biological Sciences characteristic of semi deciduous forest in the Paraná Basin (Lorenzi, 1998, Backes & Irgang, 2002). Germination of seeds and seedling establishment are phases of the plant reproductive cycle of vital importance for the maintenance and regeneration of the species, and abiotic factors like temperature and light usually affect the germination process (Bosch, Tecco, Funes, & Cabido, 2012)
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