Breeding systems of the <scp>Japanese</scp> ‐endemic carnivorous sundew species <scp> <i>Drosera makinoi</i> </scp> and <scp> <i>Drosera toyoakensis</i>
Breeding systems of the <scp>Japanese</scp> ‐endemic carnivorous sundew species <scp> <i>Drosera makinoi</i> </scp> and <scp> <i>Drosera toyoakensis</i>
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<scp>日本</scp> - 特有肉食茅膏菜种 <scp> <i>Drosera makinoi</i> </scp> 和 <scp> <i>Drosera toyoakensis</i> 的繁殖系统
DOI：
10.1111/1442-1984.12352
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发表时间：
2021
影响因子：
1.4
通讯作者：
Watanabe Mikio
中科院分区：
文献类型：
--
作者：
Tagawa Kazuki;Sahara Yurie;Watanabe Mikio
为了应对不利的环境条件，北半球的一些蔷薇属植物不开花，而是形成芽状花。芽状花表现出假闭锁配花的行为，产生的种子数量与开放的花相似。然而，目前尚不清楚这种繁殖方式在drosera属中有多普遍。在这项研究中，我们研究了开花（开花/形成芽状花）和传粉者访问对drosera makinoiandD种子生产的影响。日本的两特有种丰田树。makinoiandD。丰田株系没有开出20%-40%的裂花来形成芽状花。芽状花产生的成熟种子数量显著低于开放花产生的成熟种子数量（占开放花的0%-2%）。结果表明，花的数量与单株种子产量呈负相关，这表明花的数量降低了其一生的繁殖成功率。在bothD。makinoiandD。排除传粉者的丰田花与对照花产生的种子数量相似。我们的研究结果表明，假闭锁配子不发生在雌雄同体中。它们在开花后不需要传粉者就能结出种子。
In response to unfavorable environmental conditions, someDroseraspecies in the northern hemisphere do not open their flowers but form bud‐like flowers. The bud‐like flowers exhibit pseudo‐cleistogamous behavior and produce similar numbers of seeds as open flowers. However, it is not clear how common this type of reproduction is in the genusDrosera. In this study, we examined the effects of flowering (opening flowers/forming bud‐like flowers) and pollinator visitation on seed production inDrosera makinoiandD. toyoakensis, two endemic species in Japan.D. makinoiandD. toyoakensisplants did not open 20%–40% chasmogamous flowers to form bud‐like flowers. The numbers of mature seeds produced by bud‐like flowers were significantly lower than those produced by open flowers (0%–2% of open flowers). InD. makinoi, the percentage of bud‐like flowers correlated negatively with the seed production per plant, suggesting that the production of bud‐like flowers decreased the lifetime reproductive success. In bothD. makinoiandD. toyoakensis, pollinator‐excluded flowers produced similar numbers of seeds as control flowers. Our results suggest that pseudo‐cleistogamy does not occur inD. makinoiandD. toyoakensis, and they produce seeds without pollinator visits once flowers open.