Twigs of dove tree in high-latitude region tend to increase biomass accumulation in vegetative organs but decrease it...

Area of Science:

• Ecology
• Plant Biology
• Conservation Biology

Background:

• Adaptive traits are crucial for understanding rare plant-environment interactions.
• The adaptive mechanisms of rare plants, particularly twig responses to latitudinal environmental heterogeneity, remain underexplored.

Purpose of the Study:

• To investigate functional traits, growth relationships, and resource allocation in the annual twigs of the rare dove tree (Davidia involucrata) across three latitudinal gradients in Sichuan, China.
• To elucidate how Davidia involucrata adapts to varying environmental conditions through phenotypic adjustments.

Main Methods:

• Comparative analysis of twig diameter, dry mass, and component biomass (flower, stem, leaf) across high, middle, and low latitudinal regions.
• Investigation of allometric and isometric growth relationships between different twig components.

Main Results:

• High-latitude twigs exhibited reduced diameter (36% and 26% less) and dry mass (32% and 35% less) compared to low- and middle-latitude regions.
• Allometric growth between flower and stem/leaf mass occurred in high latitudes, contrasting with isometric growth in lower latitudes.
• Resource allocation shifted towards stems and leaves, and away from flowers, in high-latitude regions.

Conclusions:

• Davidia involucrata demonstrates adaptive phenotypic plasticity in twig morphology and biomass allocation in response to latitudinal environmental changes.
• The observed adjustments, including smaller twig size and altered resource distribution, facilitate adaptation to heterogeneous environments across latitudes.