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Publication Type J
Authors El-Keblawy, A. and A. Al-Rawai
Title Effects of seed maturation time and dry storage on light and temperature requirements during germination in invasive Prosopis juliflora
Source Flora
Author Keywords desert habitat germination harvest time maternal effect seed dormancy seed maturation storage ecological genetics progeny generation primary dormancy cucurbita-pepo scotch thistle environment plant germinability populations asteraceae
Abstract The effects of time of seed maturation and dry seed storage and of light and temperature requirements during seed incubation on final germination percentage and germination rate were assessed for the invasive shrub Prosopis juliflora (Sw.) D.C., grown under desert environmental conditions of the United Arab Emirates (UAE). Seeds were collected from Fujira on the northern coast of the UAE at different times during the growing seasons (autumn, winter and spring) and were germinated immediately and after 8 months of dry storage under room temperature (20 +/- 3 degrees C). Seeds were germinated at three temperatures (15, 25 and 40 degrees C) in both continuous light and darkness. The results showed significant effects for time of seed collection, seed storage, light and temperature of seed incubation and many of their interactions on both germination percentage and rate. Fresh seeds matured during autumn and winter germinated significantly greater at 40 'C and in light than at lower temperatures and in dark. Storage significantly increased germination percentage and rate; the increase was greater for seeds matured during winter than for seeds matured during spring. This indicates that dormancy breakage was greater in seeds of winter than seeds of spring. The need for high temperature to achieve greater germination was significantly reduced after seed storage, especially for seeds matured in autumn and winter. (c) 2005 Elsevier GrnbH. All rights reserved.
Author Address Suez Canal Univ, Fac Educ Al Arish, Dept Biol, Ismailia, Egypt. UAE Univ, Fac Sci, Dept Biol, Al Ain, U Arab Emirates. El-Keblawy, A, Suez Canal Univ, Fac Educ Al Arish, Dept Biol, Ismailia, Egypt. a.keblawy@uaeu.ac.ae
Year Published 2006
Volume 201
Issue 2
Beginning Page 135-143
Unique Article Identifier ISI:000235777300006
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