Whole plant water status and non‐structural carbohydrates under progressive drought in a Caatinga deciduous woody species

Santos, Mariana; Barros, Vanessa Andrade de; Lima, Laís Luana de; Frosi, Gabriella

doi:10.1007/s00468-021-02113-y

Cited by 18 publications

(21 citation statements)

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“…During a water deficit, the plant changes the use and dynamics of C, leading to an increase in the NSC pool. The ability to alter the NSC dynamics of trees under different degrees of water stress is an important mechanism for plant adaptation to water deficit (Davidson et al, 2021; Santos et al, 2021; Signori‐Müller et al, 2021). Recurrent water deficit events can modulate NSC partitioning and investment responses in tree species.…”

Section: Discussionmentioning

confidence: 99%

“…Specifically, woody species in tropical dry forests display high resilience following drought periods (Chazdon et al, 2016; Frosi et al, 2017; Santos et al, 2021). Under these conditions, most woody species are deciduous during the dry season.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, there are large variations among species in terms of the stored NSC components and among years in terms of possible storage amount (Davidson et al, 2021). However, little is known about the consequences of short water deficit events during the rainy season, which may affect the sugar dynamics of deciduous woody species in tropical dry forests (Santos et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

“…Drought events are one of the main phenomena studied in the literature due to the intensity and severity of their impacts on forest systems (Allen et al, 2010; Lima et al, 2021; Martínez‐Vilalta et al, 2019; Santos et al, 2014; Signori‐Müller et al, 2021). In woody species, water deficit events directly affect water transport and carbon dynamics (Santos et al, 2021). These mechanisms are interconnected and can strongly influence species survival (Rosell et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, NSCs play pivotal roles in plant tolerance to water deficit because of their ability to act as signaling molecules (Secchi & Zwieniecki, 2011), osmoprotectants, and reactive oxygen species scavengers (Regier et al, 2009; Rolland et al, 2006). Thus, the strategic allocation of carbohydrates in plants can favor acclimatization to water deficit (Rosell et al, 2020; Sala et al, 2012; Santos et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

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Dynamics of nonstructural carbohydrates in a deciduous woody species from tropical dry forests under recurrent water deficit

Nicodemos

Santos

2022

Physiologia Plantarum

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In tropical dry forests, both the dry and the short rainy seasons have become increasingly irregular. This study replicated these conditions to investigate the effects of two water deficit cycles on Cenostigma microphyllum seedlings. Impacts were assessed by measuring growth traits, water relations, gas exchange, and dynamics of nonstructural carbohydrate (NSC) content in the whole plant under greenhouse conditions in potted plants. In the first water deficit cycle, the leaf relative water content (RWC) was maintained at the expense of a rapid drop in gas exchange. Furthermore, there was a slight accumulation of NSC, mainly soluble sugars (SS) in the stem wood and roots, to the detriment of height and stem diameter growth. In the second cycle, the leaf RWC remained 40% higher than the lowest level measured in the first water deficit, and CO 2 assimilation remained twice as long in previously stressed plants.The SS content of the stems and roots was strongly correlated with the predawn leaf RWC. No strong reduction was observed in the bark stock even with the gradual increase of SS in the wood. Our data suggest that under recurrent water deficit prior to leaf drop, CO 2 assimilation is maintained, with the highest possible leaf RWC, under reduced stomatal conductance. This assists in SS transport to wood and root, which is no longer used to support the growth of the aboveground parts.

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Section: Discussionmentioning

confidence: 99%