Advances in Research of Seed Physical Dormancy

doi:10.11983/CBB15161

Abstract

Abstract: Seed physical dormancy is a special type of dormancy caused by an impermeable seed coat or pericarp. It is an adaptation to environmental changes that plants acquire during long-term phylogenesis. This article introduces the concept and definition of physical dormancy and summarizes the morphological structure of physically dormant seed, which includes a water-impermeable layer of seed coat, water-gap complex and the embryo. It also summarizes the release of seed physically dormant and the mechanisms involved in the formation of openings in the seed coat. It describes the phylogenetic relationships of physically dormant seed. It also put forword the probable research point on seed physically dormant in the future.

Tingting Xue, Yongbao Shen, Jia Liu, Fenghou Shi. Advances in Research of Seed Physical Dormancy[J]. Chinese Bulletin of Botany, 2016, 51(6): 863-871.

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URL: https://www.chinbullbotany.com/EN/10.11983/CBB15161

https://www.chinbullbotany.com/EN/Y2016/V51/I6/863

Figures/Tables 3

Figure 1 Testa structure of Melilotus albus seeds (Hamley, 1932)

Figure 2 The structure of plug-like water-gap complex of Bixa orellana seeds (Nandi, 1998)(A) The arrow points to the place of the plug-like water-gap complex; (B) The scanning electron micrographs of the plug-like water-gap complex; (C) The section sketch map of the plug-like water-gap complex

Figure 3 Summary of general trends in angiosperm seed evolution with respect to seed type and dormancy class (Finch- Savage and Leubner-Metzger, 2006)MD: Morphological dormancy; MPD: Morphological and physiological dormancy; ND: Non dormancy; PD: Physiological dormancy; PY: Physical dormancy; B1-B4: 4 subtypes of basal seed type; P: Pheripheral seed type; LA: Linear axile seed type; MA: Miniature axile seed type; FA1-FA4: 4 subtypes of foliate axile seed type. The white part is the endosperm, and the black part is the embryo.

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