Reproductive isolation in a native population of Petunia sensu Jussieu (Solanaceae)
Reproductive isolation in a native population of Petunia sensu Jussieu (Solanaceae)
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DOI：
10.1006/anbo.2001.1485
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发表时间：
2001-09-01
期刊：
影响因子：
4.2
通讯作者：
Kitching, IJ
中科院分区：
文献类型：
--
作者：
Ando, T;Nomura, M;Kitching, IJ
在巴西南大德州里约热内卢的一个地点研究了4个合属种的生殖分离。反向人工杂交实验证实了矮牵牛花（腋毛牵牛花和整合牵牛花）与小叶牵牛花（小叶牵牛花和杂叶牵牛花）之间以及小叶牵牛花和杂叶牵牛花之间存在遗传屏障。矮牵牛花（白色，夜间有香味的花）与同种异体的整合花（彩色，无香味的花）在基因上是相容的。两种具有不同传粉者的物种似乎维持了生殖隔离：夜间活动的飞蛾（Manduca contracta和M. diffissa subsp）。矮牵牛花（petuniae）为P. axillaris授粉，而每日活跃的蜜蜂（Hexantheda sp.）为P. integrifolia授粉。合叶花的昼夜开放和闭合运动与蜜蜂的活动周期同步。除了一种可能的花蜜掠夺者（一种木蜂，Xylocopa augusti）之外，没有昆虫在白天访问过p.a axillaris的花朵。腋下和整叶的花蜜含量分别在飞蛾授粉和蜜蜂授粉的花蜜含量范围内。讨论了矮牵牛属植物的生殖隔离机制。(C) 2001年植物学刊。
Reproductive isolation was studied in four syntopic species of Petunia sensu Jussieu (Solanaccae) at a site in Rio Grande do Sul State, Brazil. Reciprocal artificial crossing experiments confirmed that a genetic barrier exists between Petunia (P. axillaris and P. integrifolia) and Calibrachoa (C. parviflora and C. heterophylla), and also between C. parviflora and C. heterophylla. Petunia axillaris (white, nocturnally scented flower) is genetically compatible with the syntopic and allotopic P. integrifolia (coloured, unscented flower). Reproductive isolation appears to be maintained by the two species having different pollinators: nocturnally active hawkmoths (Manduca contracta and M. diffissa subsp. petuniae) pollinate P. axillaris while a diurnally active bee (Hexantheda sp.) pollinates P. integrifolia. Flowers of P. integrifolia exhibit diurnal opening and closing movements synchronous with the activity period of the bee. Other than a probable nectar robber (a carpenter bee, Xylocopa augusti), no insect visited flowers of P. axillaris in the day. Amounts of floral nectar in P. axillaris and P. integrifolia were within the range of hawkmoth- and bee-pollinated flowers, respectively. Reproductive isolating mechanisms in the genus Petunia sensu Jussieu are discussed. (C) 2001 Annals of Botany Company.