Genotypic Variation in Root Anatomy, Starch Accumulation, and Protein Induction in Upland Rice (Oryza sativa) Varieties Under Water Stress

Singh, Amita; Shamim, Md.; Singh, Kirti

doi:10.1007/s40003-012-0043-5

Cited by 33 publications

(14 citation statements)

References 39 publications

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“…A recent study showed that root cortex thickness was reduced in sensitive varieties of rice subjected to water deficit [28]. Cortical parenchyma might serve as a storage area of nutrients and water [29]. In our study, the decrease in root parenchymatic cell size, suggest an important role in determining reactions to drought in A. gombiformis roots.…”

Section: Discussionsupporting

confidence: 62%

Anatomical adaptations of Astragalus gombiformis Pomel. under drought stress

et al. 2014

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The present study was designed to study the effect of drought on root, stem and leaf anatomy of Astragalus gombiformis Pomel. Several root, stem and leaf anatomical parameters (cross section diameter, cortex, root cortical cells, pith, leaf lamina and mesophyll thickness) were reduced under moderate to severe water deficit (20–30 days of withheld irrigation). The stele/cross section root ratio increased under moderate water deficit. The root’s and stems vascular systems showed reduced xylem vessel diameter and increased wall thickness under water deficit. In addition, the root xylem vessel density was increased in these drought conditions while it was unchanged in the stems. The stomata density was increased under prolonged drought conditions whereas the stomata size was untouched. The leaf vascular system showed reduced xylem and phloem tissue thickness in the main vein under moderate to severe water deficit. However, in the lamina the vascular tissue and the distance between vascular bundle were unaffected. Our findings suggest a complex network of anatomical adaptations such as a reduced vessel size with increased wall thickness, lesser cortical and mesophyll parenchyma formation and increased stomata density. These proprieties are required for the maintenance of water potential and energy storage under water stress which can improve the resistance of A. gombiformis to survive in arid areas.

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Section: Discussionsupporting

confidence: 62%

Anatomical adaptations of Astragalus gombiformis Pomel. under drought stress

et al. 2014

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“…Large xylem conduits with a low resistance to water flow and high theoretical hydraulic capacity might compensate for lower water uptake from shallower and lesser-branched root systems. A similar pattern was noted by Singh et al [32] on the rice root's anatomical and histological shifts towards larger xylem vessels under water stress in resistant genotypes. The same strategy was concluded by Von Arx et al [13], where upon release from drought stress, long-living perennial herb plants of Potentilla diversifolia were able to shift the vessel sizes towards larger diameters, enabling them to utilize increased soil moisture.…”

Section: Discussionsupporting

confidence: 87%

Environmentally-Related Cherry Root Cambial Plasticity

et al. 2018

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The general aim of this research was to determine whether the cherry root cambium possesses similar water-stress adaptation abilities as the scion. Specifically, this study aimed to determine whether there is a shift in root xylem structure due to precipitation fluctuations and temperature increase during the growing season in two cherry species. Oblačinska sour cherry and European ground cherry roots with secondary structure were anatomically surveyed in detail, and correlated with meteorological conditions occurring during the vegetation when the roots were formed. Under environmental signals, both investigated species altered their radial root growth imprinting stops and starts in a cambial activity that resulted in the occurrence of intra-annual false growth rings. Changing environmental conditions triggered the shifts of large and small vessels throughout the false growth rings, but their size seemed to be mainly genetically controlled. Taking into consideration all the above, genotypes with moderate vessel lumen area—lesser or around 1200 μm2 in the inner zone, as well as no greater than 1500 μm2 in the outer zone—are presumed to be both size-controlling and stable upon the drought events. Thus, further field trials will be focused on the SV2 European ground cherry genotype, and OV13, OV32, and OV34 Oblačinska sour cherry genotypes.

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“…Root represents the first plant organ that detects a limitation of the water supply in the soil and a defective root system due to damages from drought stress impairs plant survival 27 . Cortical parenchyma serves as a storage area of nutrients and water 28 . Air spaces in cortical tissue due to collapsed cells could interrupt radial water movement in roots and reduce root/soil contact because of root shrinkage away from the soil thus limiting water uptake in drying soils 29 .…”

Section: Discussionmentioning

confidence: 99%

Transcriptomic, biochemical and physio-anatomical investigations shed more light on responses to drought stress in two contrasting sesame genotypes

Dossa

Wang

et al. 2017

Sci Rep

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Sesame is an important oilseed crop with a high oil quality. It is prone to drought stress in the arid and semi-arid areas where it is widely grown. This study aims to decipher the response of tolerant (DT) and sensitive (DS) genotypes to progressive drought based on transcriptome, biochemical and physio-anatomical characterizations. Results indicated that under severe stress, DT relied on a well-functioning taproot while DS displayed a disintegrated root due to collapsed cortical cells. This was attributed to a higher accumulation of osmoprotectants and strong activity of antioxidant enzymes especially peroxidases in DT. From roots, DT could supply water to the aboveground tissues to ensure photosynthetic activities and improve endurance under stress. Temporal transcriptome sequencing under drought further confirmed that DT strongly activated genes related to antioxidant activity, osmoprotection and hormonal signaling pathways including abscisic acid and Ethylene. Furthermore, DT displayed unique differentially expressed genes in root functioning as peroxidases, interleukin receptor-associated kinase, heat shock proteins, APETALA2/ethylene-responsive element-binding protein and mitogen activated protein kinase, to effectively scavenge reactive oxygen species and preserve root cell integrity. Finally, 61 candidate genes conferring higher drought tolerance in DT were discovered and may constitute useful resources for drought tolerance improvement in sesame.

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Genotypic Variation in Root Anatomy, Starch Accumulation, and Protein Induction in Upland Rice (Oryza sativa) Varieties Under Water Stress

Cited by 33 publications

References 39 publications

Anatomical adaptations of Astragalus gombiformis Pomel. under drought stress

Anatomical adaptations of Astragalus gombiformis Pomel. under drought stress

Environmentally-Related Cherry Root Cambial Plasticity

Transcriptomic, biochemical and physio-anatomical investigations shed more light on responses to drought stress in two contrasting sesame genotypes

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