Increasing New Root Length Reflects Survival Mechanism of Rice (<i>Oryza sativa</i> L.) Genotypes under PEG-Induced Osmotic Stress

Hannan, Afsana; Hassan, Lutful; Hoque, Md. Najmol; Tahjib‐Ul‐Arif, Md.; Robin, Arif Hasan Khan

doi:10.9787/pbb.2020.8.1.46

Cited by 18 publications

(12 citation statements)

References 40 publications

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“…A higher root-shoot ratio indicates the root growth is less affected than shoot growth of the seedlings under PEG treatment. The less affected root growth under drought stress was considered as a drought escaping mechanism of wheat seedlings by other researchers [ 26 , 27 , 55 ]. Higher RSR of the genotypes of row cluster 2 and 3 in the current study was probably due to a higher reduction in SDW than RDW of the genotypes under PEG-induced drought.…”

Section: Discussionmentioning

confidence: 99%

“…PEG molecules are inert in nature, non-ionic, and induce uniform drought stress without entering the plant cells [ 19 ]. Many early drought screening studies had also involved PEG-6000 solutions for induction of dehydration or drought under controlled environments [ 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 ]. However, in the context of this paper, we will use the terminology ‘PEG-induced drought’.…”

Section: Introductionmentioning

confidence: 99%

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Multivariate Analysis of Morpho-Physiological Traits Reveals Differential Drought Tolerance Potential of Bread Wheat Genotypes at the Seedling Stage

Mohi-Ud-Din

Hossain

Rohman

et al. 2021

Plants

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Drought is one of the foremost environmental stresses that can severely limit crop growth and productivity by disrupting various physiological processes. In this study, the drought tolerance potential of 127 diverse bread wheat genotypes was evaluated by imposing polyethylene glycol (PEG)-induced drought followed by multivariate analysis of several growth-related attributes. Results showed significant variations in the mean values of different morpho-physiological traits due to PEG-induced drought effects. Correlation analysis revealed that most of the studied traits were significantly correlated among them. The robust hierarchical co-clustering indicated that all the genotypes were clustered into four major groups, with cluster 4 (26 genotypes) being, in general, drought-tolerant followed by cluster 1 (19 genotypes) whereas, cluster 2 (55 genotypes) and 3 (27 genotypes) being drought-sensitive. Linear discriminant analysis (LDA) confirmed that around 90% of the genotypes were correctly assigned to clusters. Squared distance (D2) analysis indicated that the clusters differed significantly from each other. Principal component analysis (PCA) and genotype by trait biplot analysis showed that the first three components accounted for 71.6% of the total variation, with principal component (PC) 1 accounting for 35.4%, PC2 for 24.6% and PC3 for 11.6% of the total variation. Both PCA and LDA revealed that dry weights, tissue water content, cell membrane stability, leaf relative water content, root-shoot weight ratio and seedling vigor index played the most important discriminatory roles in explaining drought tolerance variations among 127 wheat genotypes. Our results conclude that the drought-tolerant and -sensitive wheat genotypes identified in this study would offer valuable genetic tools for further improvement of wheat productivity in arid and semi-arid regions during this time of unpredictable climate change.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Multivariate Analysis of Morpho-Physiological Traits Reveals Differential Drought Tolerance Potential of Bread Wheat Genotypes at the Seedling Stage

Mohi-Ud-Din

Hossain

Rohman

et al. 2021

Plants

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“…The lateral length of the L-type root was also increased by 2.03 fold in Binadhan-11 under PEG 5%, compared to energy. The density and length of the root hairs increased substantially at first-order lateral roots in Binadhan-11 and slightly more than PEG 5% compared to control, which mainly has a role in the root area (Hannan et al 2020).…”

Section: Discussionmentioning

confidence: 84%

Drought tolerance selection of GT1 rubber seedlings with the addition of polyethylene glycol (PEG) 6000

et al. 2021

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Abstract. Pasaribu SA, Basyuni M, Purba E, Hasanah Y. 2021. Drought tolerance selection of GT1 rubber seedlings with the addition of polyethylene glycol (PEG) 6000. Biodiversitas 22: 394-400. Tolerance of the rootstock of rubber to drought stress is not optimal. The root system can therefore be used as an indicator of drought tolerance to inhibit the growth of the plant. A good root system of rubber rootstocks is thought to help the plants acquire greater resistance to drought stress. Polyethylene glycol 6000 osmotic solution controls the water potential in the growing medium. This study aimed to analyze the effect of PEG 6000 osmotic solution (0%; 7.5%; and 15% concentration) on rubber seedlings leading to the development of morphological characters and sensitivity index. GT1 (Gondang Tapen 1) rubber seeds to be used as planting material were collected from the seed source garden of PT Socfin Indonesia. The study was carried out from January to February 2019, using a non-factorial randomized block design. The morphological characters observed were tapped root length, shoot height, the increased rate of taproot length, shoot height increase rate, ratio of taproot length, and shoot height. Data were analyzed using analysis of variance, discriminant, and drought stress sensitivity index. The results showed that the addition of PEG 6000 in planting media in vitro significantly influenced the character of the rate of increase of taproot length. The sensitivity index of taproot increase rate and the ratio of taproot length and shoot height was moderate at 7.5% levely contrast, the addition of PEG 6000 in planting media in vitro did not significantly impact it. The present study suggested that the rate of increase of taproot length was a distinguishing character showing the initial tolerance level of the GT1 seedlings to drought.

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“…It is likely that a better plant water status helped to maintain higher root turgor and root growth, even under serious osmotic stress from 15% PEG 6000 solution, as also reported by Hannan et al . (2020).…”

Section: Discussionmentioning

confidence: 99%

Relative contribution of different members of OsDREB gene family to osmotic stress tolerance in indica and japonica ecotypes of rice

et al. 2021

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Drought/osmotic stress is the single largest production constraint in rain‐fed rice cultivation. Different members of the DREB gene family are known to contribute to osmotic stress tolerance. In this study, an attempt was made to understand their relative contribution towards osmotic stress tolerance in indica and japonica ecotypes of rice. Two genotypes (one tolerant and one susceptible) from each ecotype were grown hydroponically, and 21‐day‐old seedlings were subjected to polyethylene glycol‐induced osmotic stress (15% PEG‐6000, equivalent to −3.0 bars osmotic potential). The tolerant genotypes CR143 and Moroberekan were found to have superior root traits (total root length, surface area and volume), better plant water status and increased total dry biomass as compared to their susceptible counterparts after 10 days of osmotic stress. Different members of the DREB gene family were differentially induced in response to osmotic shock (1 h after stress) and osmotic stress (24 h after stress), which also differed between the two rice ecotypes. From the gene expression profiles of 10 DREB genes (both DREB1 and DREB2 families), in indica two DREB genes, DREB1B and DREB1G, were significantly correlated with stress tolerance indices, whereas in japonica significant correlations with five DREB genes (DREB1A, DREB1B, DREB1D, DREB1E and DREB2B) were observed. We found that only one member, i.e. DREB1B, showed a significant correlation with drought tolerance indices in both indica and japonica ecotypes. This study provides an overview of the relative contribution of different members of the DREB gene family and their association with drought/osmotic stress tolerance in rice.

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Increasing New Root Length Reflects Survival Mechanism of Rice (Oryza sativa L.) Genotypes under PEG-Induced Osmotic Stress

Cited by 18 publications

References 40 publications

Multivariate Analysis of Morpho-Physiological Traits Reveals Differential Drought Tolerance Potential of Bread Wheat Genotypes at the Seedling Stage

Multivariate Analysis of Morpho-Physiological Traits Reveals Differential Drought Tolerance Potential of Bread Wheat Genotypes at the Seedling Stage

Drought tolerance selection of GT1 rubber seedlings with the addition of polyethylene glycol (PEG) 6000

Relative contribution of different members of OsDREB gene family to osmotic stress tolerance in indica and japonica ecotypes of rice

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