Drought stress condition increases root to shoot ratio via alteration of carbohydrate partitioning and enzymatic activity in rice seedlings

Xu, Wei; Cui, Kehui; Ai-hui, XU; Nie, Lei; Huang, Jikun; Peng, Shaobing

doi:10.1007/s11738-014-1760-0

Cited by 260 publications

(173 citation statements)

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“…This corroborates with the findings of [1], [5], [13]- [15]. Though many factors influence the drought tolerance of crops, these factors are not independent, but interact with one another.…”

Section: Discussionsupporting

confidence: 92%

“…The studies of [15] revealed that under drought conditions the plasticity of the plants allow increased allocation of several primary metabolites to roots while decreasing allocation to shoots.…”

Section: Effect Of Water Stress On Root/shoot Ratiomentioning

confidence: 99%

“…However, drought tolerant genotypes recorded significant root/shoot ratio under stressed condition. High root to shoot ratio has been reported as a component trait for drought avoidance by [1], [13] - [15].…”

Section: Effect Of Water Stress On Root/shoot Ratiomentioning

confidence: 99%

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In Vitro Screening of Indica Rice Genotypes for Drought Tolerance Using Polyethylene Glycol

2016

IJAAEE

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Abstract-Rice (Oryza sativa L 2n=24), one of the three major food crops of the world, covers 11 per cent of the arable land in the world. One of the main constraints of rice cultivation and production is drought, which affects the vegetative growth rate and grain yield. The present investigation was carried out to study the drought tolerance of 50 indica rice genotypes including 24 modern varieties, 16 rice cultures and ten traditional varieties along with the drought tolerant check varieties PMK 3 and MDU 5. The 50 rice genotypes were screened in in vitro bioassay method by using Polyethylene glycol (PEG 6000 MW) to assess their seedling response under drought. Drought stress was simulated at four different concentrations namely, -3.0, -5.0, -7.5 and -10.0 bars of water potential by dissolving 115, 196, 235 and 289 grams of PEG 6000 respectively in 1000 ml of distilled water. A control (0.0 bar) was maintained using distilled water The experiment was laid in completely randomized design with two replications. Data were recorded on germination percentage, root length, shoot length and root / shoot ratio at four different levels of treatment. Screening of the 50 rice genotypes for tolerance to drought at seedling stage using various concentrations of PEG 6000 resulted in the identification of nine rice genotypes namely, G3, G19, G21, G24, G25, G31, G35, G49 and G50 with tolerance to drought. The in vitro screening of rice seedlings using PEG 6000 can be adjudged as a simple, rapid and preliminary bioassay that can be used in mass screening for evaluating seedling of rice genotypes under drought.Index Terms-Drought, in vitro screening, PEG, Rice I. INTRODUCTION Drought is one of the major limiting factor that affects rice productivity in Asia [9]. It is estimated that by 2025, 15 million hectares of irrigated land and 22 million hectares in Asia will be under physical and economic water scarcity respectively [12].The percentage of drought affected land in the world has more than doubled since 1970s [4]. Early and rapid root elongation is an important indicator of drought tolerance and root length is more affected than shoot length under drought. Screenings for drought tolerance at seedling stage using osmotic solutions is reported as one of the robust methods to study resistance during germinal phase by [8] and [11]. With this background, the present study was undertaken to evaluate the drought tolerance of the 50 rice genotypes at seedling stages using polyethylene glycol 6000 (PEG 6000). II. MATERIALS AND METHODS A. Genetic materialsExperimental material comprised of fifty genotypes with broad genetic base involving 24 modern varieties, 16 rice cultures and ten traditional varieties along with the drought tolerant check varieties PMK 3 and MDU 5. B. Laboratory experimentThe experiment was conducted at the Abiotic Stress Laboratory of Department of Genetics and Plant Breeding, Faculty of Agriculture during August, 2014. The in vitro screening for drought tolerance was carried out using Polyethylene Glycol (PEG ...

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Section: Discussionsupporting

confidence: 92%

Section: Effect Of Water Stress On Root/shoot Ratiomentioning

confidence: 99%

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In Vitro Screening of Indica Rice Genotypes for Drought Tolerance Using Polyethylene Glycol

2016

IJAAEE

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“…Greater reductions in root growth compared to shoot growth under drought stress have been documented in several studies (Azhiri-Sigari et al 2000, Cui et al 2008). The reports indicated that the root growth response to drought stress depends on stress duration and stress development rate, and on the allocation of carbohydrates to the roots (Xu et al 2015). In the first year of our study, the roots probably contained lower amounts of carbohydrates; therefore, they experienced a greater reduction in dry weight compared to the shoots.…”

Section: Discussionmentioning

confidence: 55%

Morphological and physiological responses of grapevine (Vitis vinifera L.) to drought stress and dust pollution

Karami

Ghaderi

Javadi

2017

Folia Horticulturae

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Dust pollution can negatively affect plant productivity in hot, dry areas with high insolation during summer. To understand the effect of water-deficit and its interaction with dust pollution on vegetative and physiological changes in grapevine ʻBidaneh Sefidʼ, two-year-old plants were subjected to drought stress (-0.1 and -1 MPa) and dust treatment in a greenhouse during 2013 and 2014. The results showed that dust had a significant negative effect on the number of leaves, shoot length, root and shoot dry weights, and total dry weight under both drought and well-irrigated conditions. Dust, when applied in combination with drought, caused severe growth reduction. Leaf relative water content (RWC) and membrane stability index (MSI) were reduced under dust and drought stress, while soluble carbohydrate, proline, malondialdehyde (MDA) and H 2 O 2 concentrations increased. Furthermore, dust application resulted in characteristics similar to those induced by water-deficit stress and intensified vegetative and physiological changes when applied together. Dust and drought treatments increased peroxidases and ascorbate peroxidase activities when compared to the control. The results indicate that dust has an adverse effect on the growth and physiology of grapevine and plays a negative role in the response of grapevine to drought stress.Ke y wor d s: antioxidant enzymes, drought, dust, growth, lipid peroxidation

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“…'IR64' has been known as drought sensitive rice cultivar (Prakash et al, 2016). The high root to shoot ratio is to increase water uptake (Xu et al, 2015). Root characteristics become important for selection of rice cultivars (Baloch et al, 2012).…”

Section: Discussionmentioning

confidence: 99%

Morpho-Physiological and Genetic Responses of Bali Local Rice Cultivars to Drought Stress at Seedling Stage

Pharmawati

Wrasiati

2018

OnLine Journal of Biological Sciences

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Rice is the main food source in many countries in the world. One of the major limiting factors for rice growth and productivity is drought stress. In Bali there are several local rice cultivars, two of them are 'Mansur' and 'Putih Cempaka'. The cultivar 'IR 64' is one rice cultivar released by IRRI. The responses of those rice cultivars to drought stress were tested. This study aimed to analyze growth responses and expression of DREB and SOD genes under drought stress induced by PEG. Rice seedlings were grown in a hydroponic system. Two weeks old seedlings were treated with PEG 20% (-0.49 MPa) and 30% (-1.03 MPa) for three days. Root to shoot ratio was calculated and chlorophyll content was measured. RNA was extracted from the shoot. Semi-quantitative real-time PCR was conducted and the products were visualized using 1% agarose gel electrophoresis. The result showed that root to shoot ratio increased as PEG concentration increased in all rice cultivars tested. The chlorophyll content decrease under PEG treatments in all rice cultivars. The expression of Superoxide Dismutase (Cu/Zn-SOD) gene increased under drought treatmentsin 'Mansur' and 'Putih Cempaka', while in 'IR64' using SOD primer tested, the gene was not expressed. The expression of DehydrationResponsive Element Binding (DREB1) gene increased under PEG treatments both in 'Mansur' and 'Putih Cempaka'.

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Drought stress condition increases root to shoot ratio via alteration of carbohydrate partitioning and enzymatic activity in rice seedlings

Cited by 260 publications

References 44 publications

In Vitro Screening of Indica Rice Genotypes for Drought Tolerance Using Polyethylene Glycol

In Vitro Screening of Indica Rice Genotypes for Drought Tolerance Using Polyethylene Glycol

Morphological and physiological responses of grapevine (Vitis vinifera L.) to drought stress and dust pollution

Morpho-Physiological and Genetic Responses of Bali Local Rice Cultivars to Drought Stress at Seedling Stage

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