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Table 1 Characteristics of the developing seeds of P.armeniacum after pollination

From: Transcriptome analysis provides insights into the non-methylated lignin synthesis in Paphiopedilum armeniacum seed

DAP

Developmental status

Seed color

Germination percentage (%)

Lignin content (%)

ABA content ng/g FW

Water content (%)

66

T-shaped pre-embryo with four cells

Yellowish white

5.0 ± 0.2

6.0 ± 0.3

5.6 ± 2.7

87.0 ± 4.3

87

The globular embryo forms, and the outside-layer cells of the outer integument begin to dehydrate and the suspensor starts to degenerate

Yellowish white

44.0 ± 5.5

5.0 ± 0.9

6.5 ± 2.1

79.8 ± 2.1

108

The inner testa disappears, and starch and lipid globules accumulate rapidly

A mixture of yellow and light brown

66.0 ± 5.2

13.0 ± 3.5

9.0 ± 2.2

72.2 ± 1.1

122

The embryo is fully mature with a compact testa and no further morphological changes

Brown dark

37.0 ± 7.2

22.0 ± 4.1

14.4 ± 3.1

68.6 ± 2.6

150

Dry and mature seeds

Dark

10.0 ± 1.7

39.0 ± 5.45

1.4 ± 0.2

51.5 ± 0.6

180

Dry and mature seeds

Dark

5.0 ± 0.75

37.0 ± 3.56

2.3 ± 1.2

49.2 ± 0.7