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An allometry between seed kernel and seed coat shows greater investment in physical defense in small seeds 

 
论文编号:
作者: Wu LM
刊物名称: American Journal of Botany
所属学科:
论文题目英文: An allometry between seed kernel and seed coat shows greater investment in physical defense in small seeds
年: Mar 2019
卷: 106
期: 3
页: 371-376
联系作者: Wang B
收录类别:
影响因子: 2.788
参与作者:
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摘要:

Premise of the Study

Numerous studies have treated the mass of a whole seed as an integrated unit, although the components seed kernel and seed coat play different roles and are subject to different evolutionary selection pressures. In this study, we provided the first globalscale quantification of the relative biomass investments in seed coats and seed kernels. We tested the following hypotheses: there is a negative allometry between seed kernel mass and seed coat mass, and therefore, seed coat ratio (SCR) is negatively correlated with seed mass.

Methods

We compiled a globalscale data set from the published literature, including 680 plant species from 420 genera and 108 families. The relationships between seed components were quantified using standardized major axis regression, ordinary least squares regression, and phylogenetic independent analyses.

Key Results

We found a weak but significantly negative allometry between seed kernel mass and seed coat mass, which resulted in a negative relationship between seed mass and SCR. Similar results were found after accounting for the phylogeny.

Conclusions

The finding that smaller seeds invest more in protective tissues but less in stored reserves may explain the general prediction that larger seeds suffer greater predation than smaller seeds. Furthermore, this weak allometry may also explain, at least in part, why so many studies failed to identify a clear pattern of the effect of seed mass on many ecological processes. Our study suggests that the allometry between the two seed components must be considered when evaluating the ecological significance and evolutionary history of seed mass.
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