Morphological canalization, integration, and plasticity in response to population density in Abutilon theophrasti: Influences of soil conditions and growth stages.
Morphological canalization, integration, and plasticity in response to population density in Abutilon theophrasti: Influences of soil conditions and growth stages.
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苘麻种群密度的形态渠道化、整合和可塑性：土壤条件和生长阶段的影响
DOI：
10.1002/ece3.7960
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发表时间：
2021-09
影响因子：
2.6
通讯作者：
Zhou DW
中科院分区：
文献类型：
--
作者：
Wang S;Zhou DW
摘要表型整合和发育渠化被认为是限制表型可塑性的重要因素，但缺乏证据，这可能是由于缺乏对这三个过程之间关系的研究，尤其是对不同环境下的植物。采用田间试验方法，在贫瘠和肥沃的土壤条件下，对3种密度下的<$tilon theophrasti植株进行了50 d和70 d的形态学性状分析，研究了不同密度下3个形态学性状的渠化、整合和可塑性之间的相关性，并分析了不同密度下3个形态学性状对土壤条件和生育期的响应。结果表明，随着密度的增加，各性状的渠化程度降低，表型整合度和可塑性程度（绝对可塑性）增加。表型整合往往与绝对可塑性呈正相关，而性状渠化和可塑性之间的相关性在大多数情况下是不显着的，在低和中等密度的渠化和绝对可塑性之间的一些正相关。随着植物的生长，这些相关性在贫瘠土壤中增强，在肥沃土壤中减弱。我们的研究结果表明，渠化和可塑性之间的关系的复杂性：减少渠化更有可能促进积极的塑料反应在更有利的条件下，而增加的整合水平应该主要是塑料反应的结果。土壤条件和生长阶段可能通过改变植株大小、竞争强度和性状的可塑性反应来影响这些相关性对密度的反应。我们还预测，减少渠道可以是有利的或不利的，缺乏反应的压力可能表现出更强的适应能力比被动反应，因此应该适应可塑性作为主动反应。
Abstract Phenotypic integration and developmental canalization have been hypothesized to constrain the degree of phenotypic plasticity, but little evidence exists, probably due to the lack of studies on the relationships among the three processes, especially for plants under different environments. We conducted a field experiment by subjecting plants of Abutilon theophrasti to three densities, under infertile and fertile soil conditions, and analyzing correlations among canalization, integration, and plasticity in a variety of measured morphological traits after 50 and 70 days, to investigate the relationships among the three variables in response to density and how these responses vary with soil conditions and growth stages. Results showed trait canalization decreased and phenotypic integration and the degree of plasticity (absolute plasticity) in traits increased with density. Phenotypic integration often positively correlated with absolute plasticity, whereas correlations between trait canalization and plasticity were insignificant in most cases, with a few positive ones between canalization and absolute plasticity at low and medium densities. As plants grew, these correlations intensified in infertile soil and attenuated in fertile soil. Our findings suggested the complexity of the relationship between canalization and plasticity: Decreased canalization is more likely to facilitate active plastic responses under more favorable conditions, whereas increased level of integration should mainly be an outcome of plastic responses. Soil conditions and growth stage may affect responses of these correlations to density via modifying plant size, competition strength, and plastic responses in traits. We also predicted that decreased canalization can be advantageous or disadvantageous, and the lack of response to stress may demonstrate a stronger ability of adaptation than passive response, thus should be adaptive plasticity as active response.
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