Phenology, leaf gas exchange, growth and seed yield in Medicago polymorpha L. populations affected by water deficit and subsequent recovery

Yousfi, Nasreddine; Saïdi, Issam; Slama, Inès; Abdelly, Chédly

doi:10.1016/j.flora.2015.05.007

Cited by 16 publications

(9 citation statements)

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“…Some drought tolerance strategies can actually slow post-watering recovery; for example, roots exposed to dry soil can become suberized and limit water uptake until new root growth occurs [ 35 , 36 ]. Key post-drought recovery traits seem to be focused on rapid restoration of photosynthesis (membrane repair, photosystem protection and repair, pigment protection and repair), hydraulic conductance (aquaporin up-regulation, cavitation reversal, rapid osmotic adjustments), and fine root flushing [ 37 – 40 ].…”

Section: Introductionmentioning

confidence: 99%

Plant strategies for maximizing growth during water stress and subsequent recovery in Solanum melongena L. (eggplant)

2021

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Climate change is projected to increase the incidence of severe drought in many regions, potentially requiring selection for different traits in crop species to maintain productivity under water stress. In this study, we identified a suite of hydraulic traits associated with high productivity under water stress in four genotypes of S. melongena L. We also assessed the potential for recovery of this suite of traits from drought stress after re-watering. We observed that two genotypes, PHL 4841 and PHL 2778, quickly grew into large plants with smaller, thicker leaves and increasingly poor hydraulic status (a water-spender strategy), whereas PHL 2789 and Mara maintained safer water status and larger leaves but sacrificed large gains in biomass (a water-saver strategy). The best performing genotype under water stress, PHL 2778, additionally showed a significant increase in root biomass allocation relative to other genotypes. Biomass traits of all genotypes were negatively impacted by water deficit and remained impaired after a week of recovery; however, physiological traits such as electron transport capacity of photosystem II, and proportional allocation to root biomass and fine root length, and leaf area recovered after one week, indicating a strong capacity for eggplant to rebound from short-term deficits via recovery of physiological activity and allocation to resource acquiring tissues. These traits should be considered in selection and breeding of eggplant hybrids for future agricultural outlooks.

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Section: Introductionmentioning

confidence: 99%

Plant strategies for maximizing growth during water stress and subsequent recovery in Solanum melongena L. (eggplant)

2021

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“…In maize it has been suggested that drought recovery could play a more important role in plant resilience than drought resistance . A complete recovery after water deficit has been observed in different species such as maize (Sun et al, 2016), Medicago (Yousfi et al, 2015), chickpea (Yaqoob et al, 2013), and pea (Prudent et al, 2016). Although post-drought recovery is being increasingly studied, the available studies have generally focused only on a single harvest after the re-watering period, which lasted from a few days to weeks (da Silveira et al, 2001;Naya et al, 2007;Larrainzar et al, 2009;Nasr Esfahani et al, 2014;Prudent et al, 2016Prudent et al, , 2020.…”

Section: Introductionmentioning

confidence: 99%

Pea Efficiency of Post-drought Recovery Relies on the Strategy to Fine-Tune Nitrogen Nutrition

et al. 2020

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As drought is increasingly frequent in the context of climate change it is a major constraint for crop growth and yield. The ability of plants to maintain their yield in response to drought depends not only on their ability to tolerate drought, but also on their capacity to subsequently recover. Post-stress recovery can indeed be decisive for drought resilience and yield stability. Pea (Pisum sativum), as a legume, has the capacity to fix atmospheric nitrogen through its symbiotic interaction with soil bacteria within root nodules. Biological nitrogen fixation is highly sensitive to drought which can impact plant nitrogen nutrition and growth. Our study aimed at dynamically evaluating whether the control of plant N status after drought could affect nodulated pea plant's ability to recover. Two pea genotypes, Puget and Kayanne, displaying different drought resilience abilities were compared for their capacity to tolerate to, and to recover from, a 2-weeks water-deficit period applied before flowering. Physiological processes were studied in this time-series experiment using a conceptual structure-function analysis framework focusing on whole plant carbon, nitrogen, and water fluxes combined to two 13 CO 2 and 15 N 2 labeling experiments. While Puget showed a yield decrease compared to well-watered plants, Kayanne was able to maintain its yield. During the recovery period, genotype-dependent strategies were observed. The analysis of the synchronization of carbon, nitrogen, and water related traits dynamics during the recovery period and at the whole plant level, revealed that plant growth recovery was tightly linked to N nutrition. In Puget, the initiation of new nodules after water deficit was delayed compared to control plants, and additional nodules developed, while in Kayanne the formation of nodules was both rapidly and strictly re-adjusted to plant growth needs, allowing a full recovery. Our study suggested that a rapid re-launch of N acquisition, associated with a finetuning of nodule formation during the post-stress period is essential for efficient drought resilience in pea leading to yield stability.

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“…In contrast to the hastening of flowering in droughted chickpea (Chauhan et al, 2019;Fang et al, 2011), water deficit delayed time to first flower in Tunisian populations of burr medic (Medicago polymorpha) from wet (664 mm annual rainfall) and intermediate (345 mm yr -1 ) environments, with no effect on fast-developing populations from dry environments (173 mm yr -1 ) (Yousfi et al, 2015). The discrepancy between drought hastening or delaying development can be related to species, ecotype, and other factors such as the intensity of stress and interactions between water stress and temperature.…”

Section: Introductionmentioning

confidence: 91%

Genetic basis and adaptive implications of temperature-dependent and temperature-independent effects of drought on chickpea phenology

Lake

Chauhan³

et al. 2022

Preprint

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Water deficit often hastens flowering of pulses partially because droughted plants are hotter. Separating temperature-independent and temperature-dependent effects of drought is important to understand, model and manipulate phenology genetically and agronomically. We define a new trait, drought effect on phenology (DEP = difference in flowering time between irrigated and rainfed crops), and use FST genome scan to probe for genomic regions under selection for this trait. Genomic regions overlapping for early- and late-sown crops would associate with temperature-independent effects and non-overlapping genomic regions would associate with temperature-dependent effects. Time to flowering shortened with increasing water stress quantified with carbon isotope composition. Genomic regions on chromosomes 4, 5, 7 and 8 were under selection for DEP. An overlapping region for early and late sowing on chromosome 8 revealed a temperature-independent effect with four candidate genes: BAM1, BAM2, HSL2 and ANT. The non-overlapping regions included six candidate genes: EMF1, EMF2, BRC1/TCP18, BZR1, NPGR1 and ERF1. Modelling to assess DEP adaptive value showed it reduces the likelihood of drought and heat stress at the expense of cold risk. Accounting for DEP would improve phenology models to predict adaptation to future climates and breeding against the combined risks of drought, heat, and cold stress.

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Phenology, leaf gas exchange, growth and seed yield in Medicago polymorpha L. populations affected by water deficit and subsequent recovery

Cited by 16 publications

References 89 publications

Plant strategies for maximizing growth during water stress and subsequent recovery in Solanum melongena L. (eggplant)

Plant strategies for maximizing growth during water stress and subsequent recovery in Solanum melongena L. (eggplant)

Pea Efficiency of Post-drought Recovery Relies on the Strategy to Fine-Tune Nitrogen Nutrition

Genetic basis and adaptive implications of temperature-dependent and temperature-independent effects of drought on chickpea phenology

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