Stomatal dynamics are regulated by leaf hydraulic traits and guard cell anatomy in nine true mangrove species

Qie, Ya-Dong; Zhang, Qi-Wei; McAdam, Scott A.M.; Cao, Kun-Fang

doi:10.1016/j.pld.2024.02.003

Cited by 1 publication

(1 citation statement)

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“…Stomata respond to the changes in microclimatic conditions based on vapor pressure deficit (VPD) and play an important role in gas exchange, carboxylation efficiency, controlling transpirational water loss, stomatal conductance (CO 2 assimilation), water-use efficiency and nutrient assimilation which in turn influence growth and development (Allen & Ort, 2001; Raven, 2014; Jurczyk et al, 2019; Qie et al, 2024). Hence, stomatal functioning is crucial under stress conditions and is of great interest but not yet fully understood (Drake et al, 2013; Raven, 2014; Jurczyk et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Modulation of photosystem II heterogeneity and stomatal functioning contribute to sustaining photochemistry and photoprotection in mangroves exposed to a cold wave

Sebastian,

Mathur,

Elsheery

et al. 2024

Preprint

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Cold waves restrict the distribution of mangroves. This study examined the contribution of PSII heterogeneity and stomatal functioning to sustaining photochemistry and photoprotection in mangroves during a cold wave. We exposed eight populations of Kandelia obovata (cold-tolerant) and, Bruguiera gymnorhiza (cold-susceptible) from different latitudes to 27/20°C (favorable) and 10/3°C (chilling; simulated cold wave) day and night temperatures. Multiple trait responses imply that cold waves affected K. obovata the least. Significant changes in chlorophyll fluorescence transients (photosystem II [PSII]) with a slight decrease in the redox status of P700 (photosystem I [PSI]) imply a greater impact of a cold wave on PSII. During the cold wave, photochemical efficiency of PSII, efficiency of the water-splitting complex, light absorptance, stomatal pore area, cyclic electron flow, nonphotochemical quenching, and number of active PSIIα and PSII QB reducing centers decreased, while light transmittance, night respiration, and inactive PSII QB nonreducing, PSIIβ, and γ centers increased in both species. The population of K. obovata from the coldest latitudinal site (Fujian, China) was least affected by cold wave due to local evolutionary adaptations. Modulation of PSII heterogeneity and stomatal functioning is important to sustaining photochemistry and photoprotection in mangroves to cope with cold waves.

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