Dehydration survival of crop plants and its measurement

Blum, A.; Tuberosa, Roberto

doi:10.1093/jxb/erx445

Cited by 57 publications

(45 citation statements)

References 72 publications

(75 reference statements)

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“…This distinction is of relevance for the correct interpretation of physiological and omics data (Zhang and Bartels ). Therefore, although the terms dehydration‐ and desiccation‐tolerance have been used synonymously with respect to vegetative tissues (Blum and Tuberosa ), here we use DHT as a quantitative continuum trait and DT as a qualitative absolute term, the latter referring only to truly tolerant plants. It is necessary to mention that while this threshold of RWC <30% seems to be clearly defined for tracheophytes (Zhang and Bartels ), it may not be that accurate for bryophytes where a much higher proportion of species are known to tolerate this water content if the drying speed is sufficiently slow (>24 h and typically up to several days).…”

Section: Introductionmentioning

confidence: 99%

A field portable method for the semi‐quantitative estimation of dehydration tolerance of photosynthetic tissues across distantly related land plants

López‐Pozo

Flexas

Gulías

et al. 2019

Physiologia Plantarum

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Desiccation tolerant (DT) plants withstand complete cellular dehydration, reaching relative water contents (RWC) below 30% in their photosynthetic tissues. Desiccation sensitive (DS) plants exhibit different degrees of dehydration tolerance (DHT), never surviving water loss >70%. To date, no procedure for the quantitative evaluation of DHT extent exists that is able to discriminate DS species with differing degrees of DHT from truly DT plants. We developed a simple, feasible and portable protocol to differentiate between DT and different degrees of DHT in the photosynthetic tissues of seed plants and between fast desiccation (< 24 h) tolerant (FDT) and sensitive (FDS) bryophytes. The protocol is based on (1) controlled desiccation inside Falcon tubes equilibrated at three different relative humidities that, consequently, induce three different speeds and extents of dehydration and (2) an evaluation of the average percentage of maximal photochemical efficiency of PSII (F v /fm) recovery after rehydration. Applying the method to 10 bryophytes and 28 tracheophytes from various locations, we found that (1) imbibition of absorbent material with concentrated salt-solutions inside the tubes provides stable relative humidity and avoids direct contact with samples; (2) for 50 ml capacity tubes, the optimal plant amount is 50-200 mg fresh weight; (3) the method is useful in remote locations due to minimal instrumental requirements; and (4) a threshold of 30% recovery of the initial F v /fm upon reaching RWC ≤ 30% correctly categorises DT species, with three exceptions: two poikilochlorophyllous species and one gymnosperm. The protocol provides a semi-quantitative expression of DHT that facilitates comparisons of species with different morpho-physiological traits and/or ecological attributes.

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Section: Introductionmentioning

confidence: 99%

A field portable method for the semi‐quantitative estimation of dehydration tolerance of photosynthetic tissues across distantly related land plants

López‐Pozo

Flexas

Gulías

et al. 2019

Physiologia Plantarum

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“…Furthermore, plants have evolved survival traits to maximize fitness when growth conditions are not ideal, often by decreasing total seed number to ensure the full viability of a limited number of seeds. However, the ultimate goal of plant breeding is to increase or secure plant yield and production, not plant survival (Skirycz et al, 2011;Blum and Tuberosa, 2018). Future experimental planning with more thorough data collection beyond mere survival rate and that includes yield evaluations might overcome this limitation (Zhou et al, 2016).…”

Section: High-throughput Plant Phenotyping For Drought Traitsmentioning

confidence: 99%

“…Dehydration usually triggers signals that are osmotic and hormone related, with abscisic acid (ABA) mainly involved in the latter (Blum, 2015). These signals are followed by a response that could be broadly categorized into three main strategies: i) drought escape (DE), ii) dehydration avoidance, and iii) dehydration or desiccation tolerance (Kooyers, 2015;Blum and Tuberosa, 2018). DE is the attempt of a plant to accelerate flowering time before drought conditions hinder its survival.…”

Section: Introductionmentioning

confidence: 99%

Drought Resistance by Engineering Plant Tissue-Specific Responses

et al. 2020

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Drought is the primary cause of agricultural loss globally, and represents a major threat to food security. Currently, plant biotechnology stands as one of the most promising fields when it comes to developing crops that are able to produce high yields in water-limited conditions. From studies of Arabidopsis thaliana whole plants, the main response mechanisms to drought stress have been uncovered, and multiple drought resistance genes have already been engineered into crops. So far, most plants with enhanced drought resistance have displayed reduced crop yield, meaning that there is still a need to search for novel approaches that can uncouple drought resistance from plant growth. Our laboratory has recently shown that the receptors of brassinosteroid (BR) hormones use tissue-specific pathways to mediate different developmental responses during root growth. In Arabidopsis, we found that increasing BR receptors in the vascular plant tissues confers resistance to drought without penalizing growth, opening up an exceptional opportunity to investigate the mechanisms that confer drought resistance with cellular specificity in plants. In this review, we provide an overview of the most promising phenotypical drought traits that could be improved biotechnologically to obtain drought-tolerant cereals. In addition, we discuss how current genome editing technologies could help to identify and manipulate novel genes that might grant resistance to drought stress. In the upcoming years, we expect that sustainable solutions for enhancing crop production in water-limited environments will be identified through joint efforts.

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“…Dehydration tolerance is when plants are able to maintain their normal function under low leaf water status (Yates et al, 2019). Plants usually do this by accumulating both inorganic and organic substances to improve water retention by reducing the osmotic potentials (Blum, Tuberosa, 2018).…”

Section: Introductionmentioning

confidence: 99%

Drought stress response of Westerwolths ryegrass Lolium multiflorum ssp. multiflorum) cultivars differing in their ploidy level

Akinroluyo

Jaškūnė

Kemešytė

et al. 2020

Zemdirbyste-Agriculture

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Drought is one of the critical abiotic stresses that significantly affect agricultural production, and current models predict an increase in its severity and intensity in the future. Generally, polyploidy has been found to improve the resistance of plants to abiotic stress. Understanding the role of ploidy in resistance to drought was achieved by comparing the response between diploids and their respective induced autotetraploids of Westerwolths ryegrass (Lolium multiflorum ssp. multiflorum). Field trials were carried out in the 2017 and 2018 growing seasons, and mild drought simulation experiments in controlled conditions were carried out to validate the effect of chromosome duplication. Results obtained from morphological traits in the field experiment revealed that the induced tetraploids were significantly (p < 0.05) taller, had longer inflorescences and larger flag leaf area than their diploid counterparts, especially in the year 2018 characterized by the prolonged drought. This study also revealed that the induced tetraploids produced more dry matter yield than their diploid progenitors, especially in drought periods. The induced tetraploids had significantly higher antiradical activity and phenolic content than the diploid progenitors in response to mild drought, and this significantly correlated with the plant performance in 2018 field trials, indicating that increased ploidy level plays an important role in conferring resistance to drought in Westerwolths ryegrass. Furthermore, the antiradical activity and total phenolic content proved to be a good tool to evaluate drought tolerance at the vegetative stage in Westerwolths ryegrass.

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Dehydration survival of crop plants and its measurement

Abstract: Dehydration survival depends on dehydration avoidance and/or tolerance. The responsible factor is often not recognized in tests of dehydration survival. Possible correct methods for assessment of dehydration survival are proposed.

Cited by 57 publications

References 72 publications

A field portable method for the semi‐quantitative estimation of dehydration tolerance of photosynthetic tissues across distantly related land plants

A field portable method for the semi‐quantitative estimation of dehydration tolerance of photosynthetic tissues across distantly related land plants

Drought Resistance by Engineering Plant Tissue-Specific Responses

Drought stress response of Westerwolths ryegrass Lolium multiflorum ssp. multiflorum) cultivars differing in their ploidy level

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