Effects of environmental stress and nutlet morph on proportion and within-flower number-combination of morphs produced by the fruit-dimorphic species Lappula duplicicarpa (Boraginaceae)
Effects of environmental stress and nutlet morph on proportion and within-flower number-combination of morphs produced by the fruit-dimorphic species Lappula duplicicarpa (Boraginaceae)
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DOI：
10.1007/s11258-013-0171-4
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发表时间：
2013-02
期刊：
影响因子：
1.7
通讯作者：
J. Lu;W. Ma;D. Tan;J. Baskin;C. Baskin
中科院分区：
文献类型：
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作者：
J. Lu;W. Ma;D. Tan;J. Baskin;C. Baskin
异形散体物种的表型可塑性被认为是在环境波动的生境中的一种更好的塑料对冲策略。本研究的主要目的是确定非生物(土壤水分和养分有效性)和生物(纯和混合密度)因素水平对不同小坚果形态的长钩(LN；高分散，低休眠)/短钩(SN；低分散，高休眠)小坚果比率和小坚果组合的影响。我们假设应激会降低LN/SN比率。四个处理水平均导致LN/SN比值和每个坚果组合所占比例的显著差异。生殖生物量在两个变型的植物中的变化小于植物质量。在有利环境中，SN-3LN和SN-4LN组合的LN/SN比和数目较高，而在不利环境中则相对较低，从而支持了我们的假设。生殖生物量的相对分配与营养生物量的分配呈显著负相关。LN：SN一水硬铝石比对胁迫生长条件的响应发生下移，这被认为是一种更好的对冲策略。
Phenotypic plasticity in species with heteromorphic diaspores is considered to be a plastic bet-hedging strategy in environmentally fluctuating habitats. The primary aim of this study was to determine the influence of level of abiotic (soil moisture and nutrient availability) and biotic (pure and mixed density) factors on the long-glochid (LN; high dispersal, low dormancy)/short-glochid (SN; low dispersal, high dormancy) nutlet ratio and on nutlet combination of the fruit-dimorphic cold desert winter annual/spring ephemeralLappula duplicicarpaderived from different nutlet morphs. We hypothesized that stress would decrease the LN: SN ratio. All levels of the four treatments resulted in significant variation in the LN: SN ratio and in the proportion of each nutlet combination. Reproductive biomass varied less than plant mass in plants from both morphs. In favorable environments, the LN: SN ratio and number of SN–3LN and 4LN combinations were relatively high, while in unfavorable environments they were relatively low, thus supporting our hypothesis. Relative allocation to reproductive biomass was significantly negatively correlated with allocation to vegetative biomass. The downward shift that occurred in the LN: SN diaspore ratio in response to stressful growth conditions inLappula duplicicarpais assumed to be a bet-hedging strategy.