Soybean dependence on biotic pollination decreases with latitude
Soybean dependence on biotic pollination decreases with latitude
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DOI：
10.1016/j.agee.2023.108376
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发表时间：
2023-02-03
影响因子：
6.6
通讯作者：
Aizen，Marcelo Adrian
中科院分区：
文献类型：
--
作者：
da Cunha，Nicolay Leme;Chacoff，Natacha Paola;Aizen，Marcelo Adrian
从基础和应用的角度来看，识别作物中传粉者依赖性（PD）的大规模变化模式是重要的。来自野生植物的证据表明，这种变化可以在纬度上进行。来自高纬度种群的个体可能更倾向于自交，而不太依赖传粉者，这是由于环境不稳定性更高，总体温度更低，环境条件可能影响传粉者的可用性。然而，这种模式是否同样存在于作物中仍然未知。大豆（Glycine max）是全球最重要的作物之一，其部分自花授粉和自花受精，表现出PD程度的大变化（在没有动物授粉的情况下，产量从0下降到50%）。我们使用来自沿着宽纬度梯度（4-43度）分布的28个独立研究的数据来检查大豆PD的纬度变化。我们通过比较自由授粉和排除传粉者的植物之间的产量来估计PD。在没有传粉者的情况下，大豆产量平均下降了1.30%。然而，PD突然下降，在高纬度地区，这表明在自花受精种子生产的相对增加。授粉补充似乎并没有增加种子产量在任何纬度。我们认为，大豆PD的纬度变化可能是由温度和光周期影响闭花受精和雄性不育的表达。因此，野生植物对不可预测的传粉者环境的适应性交配反应也可以在高度驯化和转基因作物中留下印记。
Identifying large-scale patterns of variation in pollinator dependence (PD) in crops is important from both basic and applied perspectives. Evidence from wild plants indicates that this variation can be structured latitudinally. Individuals from populations at high latitudes may be more selfed and less dependent on pollinators due to higher environmental instability and overall lower temperatures, environmental conditions that may affect pollinator availability. However, whether this pattern is similarly present in crops remains unknown. Soybean (Glycine max), one of the most important crops globally, is partially self-pollinated and autogamous, exhibiting large variation in the extent of PD (from a 0 to ∼50% decrease in yield in the absence of animal pollination). We examined latitudinal variation in soybean’s PD using data from 28 independent studies distributed along a wide latitudinal gradient (4–43 degrees). We estimated PD by comparing yields between open-pollinated and pollinator-excluded plants. In the absence of pollinators, soybean yield was found to decrease by an average of ∼30%. However, PD decreases abruptly at high latitudes, suggesting a relative increase in autogamous seed production. Pollinator supplementation does not seem to increase seed production at any latitude. We propose that latitudinal variation in PD in soybean may be driven by temperature and photoperiod affecting the expression of cleistogamy and androsterility. Therefore, an adaptive mating response to an unpredictable pollinator environment apparently common in wild plants can also be imprinted in highly domesticated and genetically-modified crops.