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Genders in Juniperus thurifera have different functional responses to variations in nutrient availability
D Montesinos1,2, P Villar-Salvador3, P García-Fayos1
1CIDE (CSIC-UV-GV), Carretera Moncada - Náquera, Km 4.5, 46113 València, Spain.
The New Phytologist
|December 2, 2011
Summary
Male and female Juniper trees show different strategies for nutrient use. Males prioritize gas exchange, while females store nutrients for reproduction, revealing gender-specific adaptations in dioecious species.
Area of Science:
- Plant reproductive ecology
- Plant physiology
- Nutrient cycling in ecosystems
Background:
- Reproductive investment differences can lead to distinct gender-specific strategies in dioecious species.
- The impact of nutrient availability on these gender-specific responses in dioecious plants remains largely unexplored.
Purpose of the Study:
- To investigate the functional gender-specific responses of Juniperus thurifera to experimental nutrient addition.
- To understand how nutrient availability influences physiological and growth strategies between male and female trees.
Main Methods:
- Experimental fertirrigation of male and female Juniperus thurifera trees over two years.
- Monthly measurements of gas exchange (photosynthesis, stomatal conductance) and water potential.
- Yearly assessments of nitrogen concentration, carbon isotope composition (δ(13)C), growth (branch, trunk), and reproductive investment.
Main Results:
- Control males exhibited lower gas exchange and growth but higher reproductive investment and water use efficiency (WUE) than females.
- Fertirrigation increased shoot nitrogen in both genders but differentially affected physiological functions.
- Males showed increased photosynthesis with higher nitrogen, while females maintained high photosynthetic rates regardless of treatment, suggesting N storage for reproduction.
Conclusions:
- Male Juniperus thurifera prioritize immediate gas-exchange capacity in response to nutrient availability.
- Female Juniperus thurifera adopt a long-term strategy, storing nitrogen to support future reproductive events (masting).
- Nutrient availability reveals distinct, gender-specific functional strategies in dioecious plants, impacting resource allocation between growth, gas exchange, and reproduction.
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