Biometria e qualidade fisiológica de sementes de juazeiro (Ziziphus joazeiro Mart.) do Semiárido Paraibano.

Abstract

The Caatinga is a biome which has a rich diversity of plants and animals and many of these species are endemic. Its vegetation is one of the most exploited because it is a source of income for most of the population of the Northeast, being the main forms of exploitation the deforestation and harvesting of firewood as an energy source. The Ziziphus joazeiro has many qualities, from ornamentation, food for animals in the dry season, especially for goats, sheep and bats, and still provides shade. The present study aims to evaluate the biometrical variations and seed germination in ten Zizyphus joazeiro matrices, in order to select the matrices that show better germination potential for seedlings. We evaluated the percentage of germination, rate of germination, daily mean germination, shoot length, diameter, length and root dry weight and dry weight of shoot and the root. The statistical design was a DIC in factorial and means were compared by the Scott-Knott test at 5% probability and transformed into arcsine. The results show that there is a genetic and environmental variation between the dies. With respect to the percentage of germination, the matrices 1, 2, 3, 4 and 5 were highlighted; matrix 9 in the dry mass; in fruit length and diameter the matrices 1, 4 and 10 were highlighted; and matrices 5 and 8 in smallest length of seed .