【摘 要】
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Dear Editor,rnSeed germination is a major developmental transition in a plant’s life that involves the concerted action of several genetic and physiological pa
【机 构】
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Dipartimento di Bioscienze, Università degli Studi di Milano,via Celoria 26, 20133 Milano, Italy;Ins
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Dear Editor,rnSeed germination is a major developmental transition in a plant’s life that involves the concerted action of several genetic and physiological pathways (Holdsworth et al.,2008),and mostly consists of the resumption of embryo growth after a long quiescence imposed during seed maturation.In mature seeds,germination is repressed by abscisic acid (ABA),while favorable environmental conditions promote gibberellin (GA) biosynthesis and decrease ABA (Holdsworth et al.,2008).The increase in GA levels is essential for the rupture of testa and endosperm (Lee et al.,2002).The activation of cell division in the embryo is an integral part of germination that precedes the protrusion of the root through the seed coat.In Arabidopsis,this activation has been linked to significant early changes in the expression of cell-cycle elements (Masubelele et al.,2005).
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