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Fig. 1 | BMC Plant Biology

Fig. 1

From: Transcriptome profiles revealed molecular mechanisms of alternating temperatures in breaking the epicotyl morphophysiological dormancy of Polygonatum sibiricum seeds

Fig. 1

Temperature stratification treatments promote P. sibiricum seed germination and seedling establishment (A) and embryo development (B). A five main overall stages of P. sibiricum seeds during stratification: dormant mature seed before a warm stratification (Seed); seed germination with the embryo extruding from a hilum (Ger-S) and cormlet formation (Corm) at 25 °C stratification; the radicle and lateral roots form and the corm continues to grow at 4 °C stratification (Str_S); and seedling emergence with a leaf after transferring to 25 °C (Eme). B, four major stages of embryo development during the germination at 25 °C: i) undeveloped club-shaped embryo in a dormant seed at maturation; ii) immature embryo elongates and is extruded from the hilum, indicating the dormant P. sibiricum seed has germinated; iii) hypocotyl increases in size and a cormlet forms on the radicle; and iv) corm continues to grow and differentiate, which is accompanied by the emergence of a plumule. Em: embryo; Ra: radicle; Co: corm; Pl: plumule

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