Planta 213: 758-763 (2001)
Brassinosteroids and gibberellins promote tobacco seed germination
by distinct pathways
Gerhard Leubner-Metzger
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Germinating seeds |
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Seedlings |
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Light |
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Darkness |
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Light |
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Treatment |
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Endosperm |
ßGLU |
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Endosperm |
ßGLU |
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Hypocotyl |
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Control |
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29.4 ± 1.6 a |
2.2 ± 0.2 b |
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34.7 ± 2.9 |
0.7 ± 0.1 |
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100 ± 3 c |
0.01 µM BL |
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93.0 ± 0.4 |
2.2 ± 0.1 |
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72.1 ± 3.8 |
0.6 ± 0.1 |
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127 ± 2 |
10 µM GA4 |
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27.6 ± 2.4 |
2.1 ± 0.2 |
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80.2 ± 1.4 |
2.3 ± 0.3 |
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128 ± 2 |
0.01 µM BL + 10 µM GA4 |
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94.1 ± 0.9 |
n.d. d |
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84.8 ± 2.2 |
n.d. |
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146 ± 3 |
10 µM ABA |
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0.0 ± 0.0 |
0.4 ± 0.1 |
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0.0 ± 0.0 |
0.2 ± 0.1 |
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n.d. |
0.01 µM BL + 10 µM ABA |
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0.0 ± 0.0 |
0.2 ± 0.1 |
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0.0 ± 0.0 |
0.2 ± 0.1 |
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n.d. |
10 µM GA4 + 10 µM ABA |
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0.0 ± 0.0 |
n.d. |
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0.0 ± 0.0 |
0.6 ± 0.1 |
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n.d. |
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a Mean ± SE of % endosperm rupture of at least two populations of ca. 100 non-photodormant seeds imbibed for 55 h in continuous light or for 65 h in darkness
b ßGLU activity expressed as pkat per seed
c Mean ± SE of % control hypocotyl growth of at least 20 de-etiolated seedlings germinated for 150 h in darkness and then grown for 100 h in continuous light
d Not determined
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