The Agony of Choice: How Plants Balance Growth and Survival under Water-Limiting Conditions

Claeys, Hannes; Inzé, Dirk

doi:10.1104/pp.113.220921

Cited by 400 publications

(323 citation statements)

References 110 publications

(143 reference statements)

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“…Stomatal closure is one of the first plant responses to water deficit, reducing water loss by transpiration (Claeys and Inzé, 2013;Lawson and Blatt, 2014). Hence, the fast RWC and g s decrease observed in FMS CR1101 lineage since DH 4 suggests higher sensibility to water deficit.…”

Section: Leaf Water Parametersmentioning

confidence: 99%

Physiological responses to intense water deficit in two genotypes of crambe (Crambe abyssinica Hochst.)

Martins¹,

Souza²,

Pitol³

et al. 2017

Aust J Crop Sci

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Drought stress is a major environmental factor limiting growth and agricultural productivity. The objective of this study was to compare photosynthetic responses to intense water deficit and the recovery capacity in crambe plants (Crambe abyssinica Hochst. cultivar FMS Brilhante and lineage FMS CR1101) using chlorophyll a fluorescence analyses. Plants were submitted to water deficit for seven days followed by rehydration. Chlorophyll a fluorescence measurements were performed using a Handy-PEA fluorometer. Under drought stress, there was a reduction of the leaf relative water content (RWC) and stomatal conductance (g s ), with full recovery after three days of rehydration to BRS Brilhante cultivar. Both genotypes showed decreased flux of electrons transport from the absorption to the reduction of the intersystem acceptors. FMS Brilhante cultivar showed better energetic connectivity (L-band) between photosystem II (PSII) units and lower inactivation of the oxygen-evolving complex (K-band), evidencing advantages of the cultivar compared to FMS CR1101 lineage. Finally, the recovery of photosynthetic activity observed in FMS CR1101 lineage during rehydration was due the phenomena related to the electron flow around the PSI. Keywords:Chlorophyll a fluorescence; Drought tolerance; JIP-test; Recovery; Photosystem II. Abbreviations: F 0 = F 20 µs , minimum fluorescence, when all PSII RCs are open; F2 (100 µs) and F3 (300 µs) , fluorescence intensity at 100 and 300 µs, respectively; F4 (2 ms) and F5 (30 ms), fluorescence intensity at the J-step (2 ms) and the I-step (30 ms), respectively; F m , maximum fluorescence, when all PSII RCs are closed; g s , stomatal conductance; RWC, relative leaf water content; DH, days after the onset of drought stress; RC, days after rehydration; P 680 , reaction center of photosystem II; PQH 2 , plastoquinol; CF, chlorophyll a fluorescence, OEC, oxygen-evolving complex; PSI, photosystem I; PSII, photosystem II; Q A , primary quinone acceptor of PSII; RC, reaction centre; ROS, reactive oxygen species; V t , variable fluorescence between steps O (20 µs) and P; V OK , variable fluorescence between steps O (20 µs) and K (300 µs); V OJ , variable fluorescence between steps O (20 µs) and J (2 ms); V IP , variable fluorescence between steps I (30 ms) and P; ΔV , diference kinetic; TM,turgid mass; DM, dry mass.

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Section: Leaf Water Parametersmentioning

confidence: 99%

Physiological responses to intense water deficit in two genotypes of crambe (Crambe abyssinica Hochst.)

Martins¹,

Souza²,

Pitol³

et al. 2017

Aust J Crop Sci

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“…Usually, productivity and drought tolerance are inversely proportional and adaptations result in wide range of growth rates to different taxa under water limited conditions [15].…”

Section: Introductionmentioning

confidence: 99%

Seedling Growth and Physiological Responses of Sixteen Eucalypt Taxa under Controlled Water Regime

Silva

Campoe

Paula³

et al. 2016

Forests

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Abstract:We assessed growth and physiological responses of Eucalyptus and Corymbia species to water limitation aiming to widen possibilities for plantations in dry climatic conditions. We selected 16 taxa: 4 Corymbia and 12 Eucalyptus species from the Subgenera Symphyomyrtus. Seedlings were evaluated from 100 to 170 days after sowing. Growth and physiological traits showed significant differences among taxa and between two levels of water availability. Water limitation significantly impacted biomass production and physiological characteristics, however in different levels. Leaf area and biomass production decreased 15%-48% under water limitation among taxa. Eucalyptus moluccana, CCV 2, and VM1 (drought tolerant clone) showed the largest decrease in leaf area. Transpiration across taxa decreased 30%-57% and photosynthesis 14%-48% under water limited condition. Taxa from cold environments were less responsive in leaf area reduction under water limitation, and taxa from Exsertaria section showed lower reduction in photosynthesis (E. camaldulensis showed the lowest reduction). Responses to water limitation are related to the environment of origin. E. molucana, the only Adnataria species from a high precipitation region (>1500 mm year´1), was one of the most sensitive in reduction of biomass production, different behavior from the other Adnataria species, originated in regions with rainfall <750 mm year´1. Water limitation increased leaf-level water use efficiency by 18% on average, 8% in E. longirostrata, and 28% in E. camaldulensis, E. brassiana, and E. crebra. Growth and physiological responses observed show the potential of different eucalypts taxa to tolerate water limited environments.

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“…Physiological analyses have shown that plant growth is actively down-regulated during drought and is not limited by carbon supply (1)(2)(3). Reductions of growth help ensure survival by conserving water but can be undesirable for agriculture, as plant productivity is reduced more than need be if growth were less sensitive to changes in water status (3).…”

mentioning

confidence: 99%

At14a-Like1 participates in membrane-associated mechanisms promoting growth during drought in Arabidopsis thaliana

Kumar

Hsieh

Verslues

2015

Proc. Natl. Acad. Sci. U.S.A.

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Limited knowledge of how plants regulate their growth and metabolism in response to drought and reduced soil water potential has impeded efforts to improve stress tolerance. Increased expression of the membrane-associated protein At14a-like1 (AFL1) led to increased growth and accumulation of the osmoprotective solute proline without negative effects on unstressed plants. Conversely, inducible RNA-interference suppression of AFL1 decreased growth and proline accumulation during low water potential while having no effect on unstressed plants. AFL1 overexpression lines had reduced expression of many stress-responsive genes, suggesting AFL1 may promote growth in part by suppression of negative regulatory genes. AFL1 interacted with the endomembrane proteins protein disulfide isomerase 5 (PDI5) and NAI2, with the PDI5 interaction being particularly increased by stress. PDI5 and NAI2 are negative regulatory factors, as pdi5, nai2, and pdi5-2nai2-3 mutants had increased growth and proline accumulation at low water potential. AFL1 also interacted with Adaptor protein2-2A (AP2-2A), which is part of a complex that recruits cargo proteins and promotes assembly of clathrin-coated vesicles. AFL1 colocalization with clathrin light chain along the plasma membrane, together with predictions of AFL1 structure, were consistent with a role in vesicle formation or trafficking. Fractionation experiments indicated that AFL1 is a peripheral membrane protein associated with both plasma membrane and endomembranes. These data identify classes of proteins (AFL1, PDI5, and NAI2) not previously known to be involved in drought signaling. AFL1-predicted structure, protein interactions, and localization all indicate its involvement in previously uncharacterized membrane-associated drought sensing or signaling mechanisms.E ven relatively mild drought that causes reduced soil water potential (ψ w ) can result in dramatically reduced plant growth and agricultural productivity. Physiological analyses have shown that plant growth is actively down-regulated during drought and is not limited by carbon supply (1-3). Reductions of growth help ensure survival by conserving water but can be undesirable for agriculture, as plant productivity is reduced more than need be if growth were less sensitive to changes in water status (3). Also, specific metabolic pathways, such as proline metabolism, are stress regulated and contribute to drought tolerance.The sensing and signaling mechanisms controlling growth and metabolic responses to drought remain unclear. Many hypotheses of how plants sense water loss center on detection of mechanical stimuli generated by loss of turgor and cell shrinkage. This includes changes in membrane shape or disruption of cell wall-cell membrane connections possibly detected by proteins, such as mechanosensitive channels or receptor-like kinases that bind cell wall components (4-9). Proteins that induce or detect membrane curvature are known in mammalian cells (10) but have been little considered in plants. Also, in analogy to mammal...

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The Agony of Choice: How Plants Balance Growth and Survival under Water-Limiting Conditions

Cited by 400 publications

References 110 publications

Physiological responses to intense water deficit in two genotypes of crambe (Crambe abyssinica Hochst.)

Physiological responses to intense water deficit in two genotypes of crambe (Crambe abyssinica Hochst.)

Seedling Growth and Physiological Responses of Sixteen Eucalypt Taxa under Controlled Water Regime

At14a-Like1 participates in membrane-associated mechanisms promoting growth during drought in Arabidopsis thaliana

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