2007
DOI: 10.1093/aob/mcm016
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Germination Ecophysiology of Annona crassiflora Seeds

Abstract: The physiological dormancy component is broken by low temperature and/or temperature fluctuations preceding the rainy season. Subsequent embryo growth and digestion of the endosperm are both likely to be controlled by gibberellins synthesized during the breaking of physiological dormancy. Radicle protrusion thus occurred at the beginning of the rainy season, thereby maximizing the opportunity for seedlings to emerge and establish.

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Cited by 51 publications
(43 citation statements)
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“…The embryo is basal and crude, approximately 2 mm long ( Figures 2F, 2G and 2H), hyaline and gelatinous. It was observed in the embryonic axis the region of the radicle and cotyledons ( Figure 2H), although for most seeds, these structures had not fully differentiated, similar to the observations by Silva et al (2007). The morphological characteristics of the seed found in this experiment are equivalent to the information about the species cited by Lima-Brito et al (2006) and Silva et al (2007).…”
Section: Resultssupporting
confidence: 88%
“…The embryo is basal and crude, approximately 2 mm long ( Figures 2F, 2G and 2H), hyaline and gelatinous. It was observed in the embryonic axis the region of the radicle and cotyledons ( Figure 2H), although for most seeds, these structures had not fully differentiated, similar to the observations by Silva et al (2007). The morphological characteristics of the seed found in this experiment are equivalent to the information about the species cited by Lima-Brito et al (2006) and Silva et al (2007).…”
Section: Resultssupporting
confidence: 88%
“…Although the position of the seeds of A. macroprophyllata fruits did not infl uence the germination behaviour, as has been indicated by González-Esquinca et al (1997), germination is scant in the early months and increases (but without reaching 100 %) as storage time passes. This behaviour may be associated with different levels of dormancy regulated by the balance of phytoregulators (Ferreira et al, 2002;da Silva et al, 2007;de Oliveira et al, 2010;Socolowski and Cicero, 2011). Van Setten and Koek-Noorman (1992) proposed the alternate explanation that Annonaceae seeds contain small, underdeveloped and immature embryos when dispersed, and because of this lack of maturity, they require time for growth after dispersion.…”
Section: Discussionmentioning
confidence: 99%
“…1). The easiest way to examine embryos is to dissect seeds under a stereomicroscope (Silva et al 2007;Le Stradic 2012). Detailed descriptions of embryo anatomy may prove helpful but are not strictly needed.…”
Section: Determining the Kind Of Seed Dormancymentioning
confidence: 99%
“…Detailed descriptions of embryo anatomy may prove helpful but are not strictly needed. To further assess details on embryo anatomy, routine anatomical procedures can be carried out (see Silveira et al 2012 and references therein), but simple seed dissection procedures for evaluating embryo growth (Silva et al 2007) or to confirm that seeds have fully developed/differentiated embryos are sufficient for assigning morphological or morphophysiological dormancy (Fig. 1).…”
Section: Determining the Kind Of Seed Dormancymentioning
confidence: 99%