Evidence of combined flower thermal and drought vulnerabilities portends reproductive failure under hotter‐drought conditions
580
[SDE] Environmental Sciences
0106 biological sciences
Hot Temperature
550
Reproduction
flower hydraulics
drought tolerance
Water
Flowers
Droughts
Plant Leaves
climate change
[SDE]Environmental Sciences
thermal vulnerability
plant reproduction
DOI:
10.1111/pce.14857
Publication Date:
2024-02-19T09:23:41Z
AUTHORS (12)
ABSTRACT
AbstractDespite the abundant evidence of impairments to plant performance and survival under hotter‐drought conditions, little is known about the vulnerability of reproductive organs to climate extremes. Here, by conducting a comparative analysis between flowers and leaves, we investigated how variations in key morphophysiological traits related to carbon and water economics can explain the differential vulnerabilities to heat and drought among these functionally diverse organs. Due to their lower construction costs, despite having a higher water storage capacity, flowers were more prone to turgor loss (higher turgor loss point; ΨTLP) than leaves, thus evidencing a trade‐off between carbon investment and drought tolerance in reproductive organs. Importantly, the higher ΨTLP of flowers also resulted in narrow turgor safety margins (TSM). Moreover, compared to leaves, the cuticle of flowers had an overall higher thermal vulnerability, which also resulted in low leakage safety margins (LSM). As a result, the combination of low TSMs and LSMs may have negative impacts on reproduction success since they strongly influenced the time to turgor loss under simulated hotter‐drought conditions. Overall, our results improve the knowledge of unexplored aspects of flower structure and function and highlight likely threats to successful plant reproduction in a warmer and drier world.
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