Extending plant water‐use strategies to flowers: Evidence from trait correlations across plant organs

Overview

This study examines whether flowers exhibit ecophysiological strategies analogous to leaves and evaluates trait associations between floral and foliar organs. Comparative analysis of homologous carbon and water economy traits across 245 plant species from four geographically distinct biomes (Arctic tundra, tropical campos rupestres, Patagonian steppe, and Mediterranean-type California botanical garden) reveals patterns of trait coordination spanning more than 100 degrees of latitude.

Methods and approach

Seven homologous traits related to carbon and water economics were assessed in both flowers and leaves across 245 species. Statistical approaches included correlation analysis, standard major axes regression, principal component analysis, and trait network analysis to evaluate associations among floral and foliar traits. The geographic sampling strategy provided environmental variation across latitudinal and climatic gradients.

Key Findings

Floral trait combinations distributed along a continuum ranging from large flowers with thick petals and extended water turnover times to small flowers with thin petaloid structures and elevated residual conductance. Positive scaling relationships were identified among flower and leaf traits including residual conductance, water turnover time, petal and leaf thickness, and organ area. Network analysis revealed absence of modular structure when considering all species collectively, indicating integrated trait variation across organs rather than distinct floral and foliar trait clusters.

Implications

Flower phenotypes demonstrate functional linkage to leaf phenotypes through water economy and size-related traits, indicating that floral and foliar organs coordinate ecophysiological strategies within individual plants. This cross-organ correlation suggests that habitat filtering acting on the ecophysiological strategies of one organ would necessarily constrain phenotypic variation in the alternative organ, creating interdependency in organ-level trait expression. The documented trait continua propose that flowers display similar economic principles governing resource allocation and water use as documented in leaves, extending conceptual frameworks of plant ecophysiology beyond traditional focus on vegetative tissues.

Scope and limitations

This summary is based on the study abstract and available metadata. It does not include a full analysis of the complete paper, supplementary materials, or underlying datasets unless explicitly stated. Findings should be interpreted in the context of the original publication.