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首页> 外文期刊>Australian Journal of Botany >Reproductive and ecophysiological attributes of the rare Gardeniaactinocarpa (Rubiaceae) compared with its common co-occurring congener,G-ovularis
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Reproductive and ecophysiological attributes of the rare Gardeniaactinocarpa (Rubiaceae) compared with its common co-occurring congener,G-ovularis

机译：与常见的共生同源物G-ovularis相比，稀有的Garden子（（科）的生殖和生态生理特性

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摘要

Gardenia actinocarpa Puttock (rare) and G. ovularis F. M. Bailey (widespread) are closely related cooccurring shrub-small trees of rainforests of far north Queensland, Australia. Gardenia actinocarpa is endemic to alluvial lowlands along Noah-Oliver Creeks of Cape Tribulation, whereas G. ovularis spans a wider habitat and occurs on a range of substrates and altitudes. The rare G. actinocarpa is cryptically and strictly dioecious, with a longer reproductive period (9 months) and a low fecundity (1.77 fruits per female tree). In contrast, G. ovularis, although also dioecious, has a shorter reproductive phase (4 months) and produces more fruits (35.76 fruits per female tree), some of which may occur in the absence of fertilisation (apomixis). Under different regimes of photosynthetically active radiation (PAR), seed germination percentages and patterns were similar (70-90%) in the two species, although at 37% PAR G. actinocarpa has lower germination (55-68%). The rare G. actinocarpa loses seed viability very rapidly (< 15% viability after 3 months) compared with G. ovularis (37%). Gardenia actinocarpa grows and survives in both closed forest understorey and in small gaps, while G. ovularis prefers light gaps (both small and large). Net photosynthetic measurements of seedlings grown at 2.5 and 37% PAR suggest that the physiological performance of G. actinocarpa is not inferior to that of G. ovularis, although the latter exhibits greater plasticity. In a density-dependent seedling growth experiment, G. actinocarpa, surprisingly, has a superior competitive ability. Thus, the rarity of G. actinocarpa may be a result of limited fecundity, reduced seed dispersal ability and lack of soil seed-banks rather than inferior vegetative and ecophysiological traits.
机译：ia子猕猴桃Put（极少见）和G. ovularis F. M. Bailey（广泛见于）是澳大利亚昆士兰州北部雨林中同时出现的灌木小乔木。 act子花猕猴桃是苦角海角诺亚-奥利弗河沿岸的冲积低地的特有种，而卵形猪笼草的栖息地范围更广，并在一定范围的基底和高度上发生。稀有的猕猴桃是隐密严格的雌雄异体，繁殖期较长（9个月），繁殖力低（每棵雌树1.77个果实）。相比之下，G。ovularis虽然也是雌雄异体，但其生殖期较短（4个月），并产生更多的果实（每棵雌树35.76颗果实），其中一些果实可能在没有施肥的情况下发生（apomixis）。在光合作用活性辐射（PAR）的不同制度下，两个物种的种子萌发百分率和模式相似（70-90％），尽管PAR G. actinocarpa的发芽率较低（55-68％）。与卵形G. ovularis（37％）相比，稀有的猕猴桃G. actincarpa丧失了非常快的种子活力（3个月后<15％的活力）。 act子猕猴桃在密闭的林下层和小间隙中生长并存活，而卵形G. ovularis则喜欢轻间隙（小间隙和大间隙）。在PAR为2.5和37％的条件下生长的幼苗的净光合作用测量结果表明，猕猴桃的生理性能并不逊色于小卵泡菜，尽管后者表现出更大的可塑性。令人惊讶的是，在密度依赖的幼苗生长实验中，猕猴桃具有优异的竞争能力。因此，猕猴桃的稀有性可能是由于繁殖力有限，种子传播能力降低和缺乏土壤种子库而不是营养和生态生理特性较差的结果。

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