The Ratio of Dormant and Non-dormant Seeds in <i>Robinia pseudoacacia</i> L.

Chiba Sho, Koyama Hiromasa

doi:10.4005/jjfs.98.53

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Other Title

ニセアカシアの休眠種子と非休眠種子の生産比率
ニセアカシアの休眠種子と非休眠種子の生産比率 : 個体による違いと河川敷における分布状況
ニセアカシアノキュウミンシュシトヒキュウミンシュシノセイサンヒリツ : コタイニヨルチガイトカセンシキニオケルブンプジョウキョウ
―個体による違いと河川敷における分布状況―
Difference among Individual and Distribution in River Bank

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Description

Black locust shows seed heteromorphism producing both non-dormant and dormant morph. This study examined the ratio of both morphs for each tree in relation to its size and distribution along a river. The percentages of non-dormant seeds highly varied between individuals but order of them was rather consistent between two consecutive years. This suggested that there are individuals that are likely to produce more dormant seeds while others produce more non-dormant seeds. The trees with higher percentages of dormant seeds tend to occur at upper stream along the river side, and vice versa. Many larger individuals tend to produce higher percentages of dormant seeds. However, smaller individuals tend to produce higher percentages of non-dormant seeds, even though there were also trees with lower percentages. Therefore, the ratio of both morphs couldn’t be explained only by an age of the tree or the size. To produce non-dormant seeds would be advantageous, since they can rapidly expand population by immediate germination and establishment on the newly created open sites at downstream. On the other hand, most of elder trees tend to shed dormant seeds forming soil-seed-bank which contributes to recover following disturbances. In conclusion, seed hetromorphism in Black locust attributes to rapid expansion of this species at riverbed.

Journal

Journal of the Japanese Forest Society

Journal of the Japanese Forest Society 98 (2), 53-58, 2016

THE JAPANESE FORESTRY SOCIETY

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