Growth and developmental responses of crop plants under drought stress: a review

Anjum, Shakeel Ahmad; Ashraf, Umair; Zohaib, Ali; Tanveer, Mohsin; Naeem, Muhammad Kashif; Ali, Iftikhar; Tabassum, Tahira; Nazir, Usman

doi:10.13080/z-a.2017.104.034

Cited by 185 publications

(117 citation statements)

References 88 publications

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“…One of the main protective mechanisms against water restriction is ABA-mediated stomatal closure followed by a decrease in net photosynthetic rate and increase in photorespiration [ 15 , 16 , 17 ]. In addition, a disbalance in plant nutrients may result in nitrogen deficiency and reduced protein biosynthesis, even under mild drought [ 18 ].…”

Section: Introductionmentioning

confidence: 99%

Leaf Soluble Sugars and Free Amino Acids as Important Components of Abscisic Acid—Mediated Drought Response in Tomato

Živanović

Komić

Tosti

et al. 2020

Plants

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Water deficit has a global impact on plant growth and crop yield. Climate changes are going to increase the intensity, duration and frequency of severe droughts, particularly in southern and south-eastern Europe, elevating the water scarcity issues. We aimed to assess the contribution of endogenous abscisic acid (ABA) in the protective mechanisms against water deficit, including stomatal conductance, relative water potential and the accumulation of osmoprotectants, as well as on growth parameters. To achieve that, we used a suitable model system, ABA-deficient tomato mutant, flacca and its parental line. Flacca mutant exhibited constitutively higher levels of soluble sugars (e.g., galactose, arabinose, sorbitol) and free amino acids (AAs) compared with the wild type (WT). Water deficit provoked the strong accumulation of proline in both genotypes, and total soluble sugars only in flacca. Upon re-watering, these osmolytes returned to the initial levels in both genotypes. Our results indicate that flacca compensated higher stomatal conductance with a higher constitutive level of free sugars and AAs. Additionally, we suggest that the accumulation of AAs, particularly proline and its precursors and specific branched-chain AAs in both, glucose and sucrose in flacca, and sorbitol in WT, could contribute to maintaining growth rate during water deficit and recovery in both tomato genotypes.

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Section: Introductionmentioning

confidence: 99%

Leaf Soluble Sugars and Free Amino Acids as Important Components of Abscisic Acid—Mediated Drought Response in Tomato

Živanović

Komić

Tosti

et al. 2020

Plants

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“…Leaf area index (LAI) is among the most important variables in terms of improving crop productivity; it can also be widely modified by manipulating agronomic practices [24]. Most agronomic practices including nutrient management are often aimed at achieving higher LAI for maximizing interception of radiation which in turn maximizes the total dry matter production and grain yield.…”

Section: Leaf Area Index (Lai)mentioning

confidence: 99%

Combined Application of Phosphorus Fertilizer with Tithonia Biomass Improves Grain Yield and Agronomic Phosphorus Use Efficiency of Hybrid Maize

Endris

2019

International Journal of Agronomy

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Low soil phosphorous level is among several constraints limiting crop productivity in southwestern Ethiopia. The dominant soil types in the region are acidic nitosols that are low in plant-available phosphorus. Most farmers cultivate maize with minimal external inputs and hence result in suboptimal yield levels. The effect of applying Tithonia biomass and phosphorus fertilizer on the agronomic efficiency of phosphorus and yield of maize was therefore investigated in a randomized complete block design with three replications. Tithonia (Tithonia diversifolia) biomass and Triple Superphosphate (TSP) were used as organic and inorganic sources of phosphorus, respectively. Significant treatment differences (P<0.01) were observed for most of the parameters studied including agronomic efficiency, partial factor productivity (PFP), and grain yield. Agronomic phosphorus use efficiency increased from 26.3 at the sole TSP to 163 at treatment 7, a staggering 520% increment when combined with Tithonia biomass. Similarly, PFP of phosphorus increased from 169.1 to 324.8. At the same time, 53% increment of the grain yield was recorded over the control. Although applying the highest Tithonia biomass alone gave the highest grain yield, application of just 50% of the highest rate of Tithonia biomass and TSP looks more appealing to smallholder maize producers in the region. The result therefore indicated that Tithonia biomass could be utilized in smallholder maize production system as a source of plant nutrients such as phosphorus; it also emphasized the need to allot more resources and attention in exploring locally available and cheap sources of plant nutrients which could augment crop productivity amid the mounting financial challenges faced by farmers in the region.

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“…Regardless of the proposed irrigation management, inoculated plants grew taller, reiterating the benefits of B. aryabhattai on the height of sugarcane plant, an agronomic parameter that best represents the vegetative growth induced under water stress (Anjum et al, 2016;Wang et al, 2016). Drought suppresses several characteristics related to plant size; cell division and expansion are the main ones (Anjum et al, 2017). According to these authors, small plants are inefficient in photosynthesis due to the inability to intercept sunlight, a natural resource indispensable for the production of photoassimilates in autotrophic organisms.…”

Section: Development Of Sugarcane Plants Inoculated With B Aryabhattaimentioning

confidence: 99%

“…possess the ability to secrete plant hormones, which may partly explain the enhancement of phenotypic traits found in sugarcane seedlings inoculated with B. aryabhattai (Davière & Archard, 2013;Vurukonda et al, 2016;Arkhipova et al (2007); Liu et al, 2013). In plants under water stress, stem diameter is retracted due to the inability to maintain cell turgor, affected by the availability of water in soil (Huang et al, 2013;Anjum et al, 2017). Therefore, these references explain the occurrence of smaller diameter stem in sugarcane plants under dry environments and irrigated every 21 days, which are probably stressful, and would precede the probable contribution of B. aryabhattai to radial expansion of stem cells by the secretion of phytohormones regulating stem morphology, mainly cytokinins.…”

Section: Development Of Sugarcane Plants Inoculated With B Aryabhattaimentioning

confidence: 99%

Induction of drought tolerance by inoculation of Bacillus aryabhattai on sugarcane seedlings

May¹,

Moreira²,

Mascarin³

et al. 2019

Científica

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In twenty-first century, free-living endophytic and rhizosphere-competent microbes have become breakthrough strategies to meet global demands for sustainable foods and renewable fuelstocks owing to their great potential to produce stress-tolerant food and energy crops. Here, we investigate how Bacillus aryabhattai could mitigate water stress by drought in sugarcane seedlings. Briefly, the sugarcane genotypes, namely IAC91-1099 and RB85-5156, both exposed to cells-centrifuged B. aryabhattai suspension at 1x10 8 CFU mL-1 and non-treated were developed under irrigation regimes of 0, 7, 14 and 21 days to simulate different degrees of soil moisture content. The osmotolerant bacterium remarkably enhanced development of aboveground structures and root system, mainly in irrigated seedlings of IAC91-1099. Clearly noted that microbial metabolism depends on genotype and soil water potential to promote plant growth. This bacterium probably enabled sugarcane plants in early phenological stages to cope with water deficit by regulation of plant growth hormones along with solubilization of nutrients. Of particular importance, the bacterium exerted more pronounced effects by conferring drought tolerance at 7 and 14 days irrigation interval, irrespective of sugarcane genotype, which also translated into increased biomass of shoots and roots. Microbial degradation of ethylene precursors exuded in rhizosphere could reasonably explain why B. aryabhattai-associated seedlings developed deeper root systems to uptake water and nutrients and, consequently, allocating larger amounts of dry matter to shoots. Collectively, our findings provide relevant insights on the beneficial effects of the cacti-associated B. aryabhattai in alleviating the harmful effects of drought stress in seedlings and contribute to increasing our understanding of the phenotypic outcomes from the interaction between sugarcane genotypes and a beneficial rhizobacterium. Hence, this bacterial inoculant forms a low-cost and ecologically sound strategy to enhancing drought stress tolerance in sugarcane crops planted in water-limited zones in Brazil.

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Growth and developmental responses of crop plants under drought stress: a review

Cited by 185 publications

References 88 publications

Leaf Soluble Sugars and Free Amino Acids as Important Components of Abscisic Acid—Mediated Drought Response in Tomato

Leaf Soluble Sugars and Free Amino Acids as Important Components of Abscisic Acid—Mediated Drought Response in Tomato

Combined Application of Phosphorus Fertilizer with Tithonia Biomass Improves Grain Yield and Agronomic Phosphorus Use Efficiency of Hybrid Maize

Induction of drought tolerance by inoculation of Bacillus aryabhattai on sugarcane seedlings

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