scholarly journals Genetic Variability Parameters for Yield and Yield Related Traits in Rice (Oryza sativa L.) under Irrigated and Drought Stress Condition

2020 ◽  
Vol 9 (2) ◽  
pp. 1137-1143
Author(s):  
Sadia Perween ◽  
Anand Kumar ◽  
S. P. Singh ◽  
Saty endra ◽  
Mankesh Kumar ◽  
...  
Keyword(s):  
Oryza Sativa ◽  
Drought Stress ◽  
Genetic Variability ◽  
Stress Condition ◽  
Oryza Sativa L ◽  
Drought Stress Condition

scholarly journals The growth and leaf chlorophyll in black rice (Oryza sativa L. Indica) plants induced by gamma rays as responses to the drought stress condition

2021 ◽  
Vol 905 (1) ◽  
pp. 012016
Author(s):  
E Purwanto ◽  
A M Ula ◽  
Parjanto
Keyword(s):  
Oryza Sativa ◽  
Drought Stress ◽  
Chlorophyll Content ◽  
Gamma Rays ◽  
Gamma Ray ◽  
Oryza Sativa L ◽  
Black Rice ◽  
Leaf Chlorophyll ◽  
Drought Stress Condition ◽  
Gamma Ray Irradiation

Abstract The aims of this study to determine the growth and leaf chlorophyll content in black rice (Oryza sativa L. Indica) which were induced by gamma rays as responses to the drought stress conditions. This study was carried out on July–November 2020, at the experimental field (screenhouse), Medicinae Street, UNS Perum, Jati Village, Jaten District, Karanganyar Regency. Meanwhile, the chlorophyll content test was carried out at Plant Tissue Culture and Biotechnology Laboratory, Faculty of Agriculture, Universitas Sebelas Maret. The study was a field trial research design without replication. The research treatments were 24 genotypes as follows: 10 genotypes of 100 gray gamma-ray irradiation with 2 control genotypes; and 10 genotypes of 200 gray gamma-irradiation with 2 control genotypes. The results showed that the plant height was lower in plants with irradiation compared to the Control-01 plant. The crown-root ratio showed irradiated plants had higher average results than control plants. The leaf chlorophyll of 100 gray irradiated plants showed higher results than control; while 200 gray irradiated plants showed similar results.

scholarly journals Assessment of Genetic Diversity in Rice (Oryza sativa L.) under Irrigated and Drought Stress Condition

2020 ◽  
pp. 112-125
Author(s):  
Sadia Perween ◽  
Anand Kumar ◽  
Bishun Deo Prasad ◽  
Mukesh Choudhary
Keyword(s):  
Genetic Diversity ◽  
Drought Stress ◽  
Leaf Area ◽  
Stress Condition ◽  
Oryza Sativa L ◽  
Genetic Distances ◽  
Spikelets Per Panicle ◽  
Cluster Distance ◽  
Breeding Programmes ◽  
Drought Stress Condition

A set of 48 rice genotypes were evaluated to assess the magnitude of genetic diversity under irrigated (control) and reproductive stage drought stress conditions during Kharif, 2018 at Rice Research Farm, Bihar Agricultural University, Sabour (Bhagalpur), India. On the basis of D2 statistics, all the genotypes were grouped into nineteen clusters in irrigated condition with cluster I consisting of maximum number of genotypes (24) followed by cluster III (7) and rest of the clusters were represented by single genotype in irrigated condition. Under drought stress condition, forty eight genotypes were grouped into eleven clusters, cluster I consisted of maximum number of genotypes (24) followed by cluster II and III (8 genotypes in each cluster) and rest of the clusters were mono-genotypic. The highest inter-cluster distance was recorded between cluster XVIII and XIX (28.53), followed by cluster X and VIII (24.20), cluster XIII and XVIII (23.98) and cluster VII and XVIII (23.79) in irrigated condition while in drought stress condition the highest inter-cluster distance was observed between cluster IX and X (31.72), followed by cluster V and IX (28.77), cluster VI and VII (25.98) and cluster IV and IX (25.98) indicating wider genetic diversity among the genotypes between these clusters. The hybridisation programme involving genotype of cluster XVIII and cluster XIX under irrigated condition and the genotypes of cluster IX and X under drought stress condition could be undertaken to isolate high yielding segregants, since these genotypes have high yielding potential, number of effective tillers per hill, relative water content, leaf area, root biomass, panicle length, biological yield, harvest index, plant height, number of fertile grains per panicle, total number of spikelets per panicle, leaf area and proline content with more genetic distances. The parents for hybridisation could be selected on the basis of their large inter-cluster distance for isolating useful recombinants in the segregating generations. Hence, these genotypes might be used in a multiple crossing programme to recover transgressive segregants. Therefore, it is suggested that if the diverse genotypes from these groups along with the other desirable attributes are used in breeding programmes, it is expected to produce better segregants for high grain yield and yield contributing traits due to non-allelic interaction.

Assessment of rice (Oryza sativa L.) genotypes for drought stress tolerance using morpho-physiological indices as a screening technique

2020 ◽  
Vol 53 (1) ◽  
Author(s):  
Asma Asma ◽  
Iqbal Hussain ◽  
Muhammad Yasin Ashraf ◽  
Muhammad Arslan Ashraf ◽  
Rizwan Rasheed ◽  
...  
Keyword(s):  
Oryza Sativa ◽  
Drought Stress ◽  
Stress Tolerance ◽  
Oryza Sativa L ◽  
Screening Technique ◽  
Drought Stress Tolerance ◽  
Physiological Indices

scholarly journals Water uptake dynamics under progressive drought stress in diverse accessions of the OryzaSNP panel of rice (Oryza sativa)

2012 ◽  
Vol 39 (5) ◽  
pp. 402 ◽  
Author(s):  
Veeresh R. P. Gowda ◽  
Amelia Henry ◽  
Vincent Vadez ◽  
H. E. Shashidhar ◽  
Rachid Serraj
Keyword(s):  
Oryza Sativa ◽  
Drought Stress ◽  
Root Growth ◽  
Water Uptake ◽  
Root Length Density ◽  
Oryza Sativa L ◽  
Root Water Uptake ◽  
Snp Markers ◽  
Drought Response ◽  
Genotypic Differences

In addition to characterising root architecture, evaluating root water uptake ability is important for understanding drought response. A series of three lysimeter studies were conducted using the OryzaSNP panel, which consists of 20 diverse rice (Oryza sativa L.) genotypes. Large genotypic differences in drought response were observed in this genotype panel in terms of plant growth and water uptake. Total water uptake and daily water uptake rates in the drought-stress treatment were correlated with root length density, especially at depths below 30 cm. Patterns of water uptake among genotypes remained consistent throughout the stress treatments: genotypes that initially extracted more water were the same genotypes that extracted more water at the end of the study. These results suggest that response to drought by deep root growth, rather than a conservative soil water pattern, seems to be important for lowland rice. Genotypes in the O. sativa type aus group showed some of the greatest water uptake and root growth values. Since the OryzaSNP panel has been genotyped in detail with SNP markers, we expect that these results will be useful for understanding the genetics of rice root growth and function for water uptake in response to drought.

scholarly journals Response of some upland rice varieties to drought stress

2017 ◽  
Vol 1 (2) ◽  
pp. 69-77
Author(s):  
EDI PURWANTO ◽  
SAMANHUDI SAMANHUDI ◽  
YONIAR EFFENDI
Keyword(s):  
Drought Stress ◽  
Stress Condition ◽  
Upland Rice ◽  
Rice Variety ◽  
Dry Weight ◽  
Grain Weight ◽  
Rice Varieties ◽  
Resistance Level ◽  
Drought Stress Condition ◽  
Four Levels

Purwanto E, Samanhudi, Yoniar Effendi Y. 2017. Response of some upland rice varieties to drought stress. Trop Drylands 1: 69-77. The study aimed to examine the response of upland rice varieties at germination stage on several PEG (Polyethylene Glycol) 6000 concentration levels and to determine growth characteristics, physiological changes and yield of upland rice varieties under drought stress condition in a pot experiment. The study consisted of two experiments; the first was to study germination and early growth, and the second was to study the vegetative and generative growth of upland rice under drought stress condition. Experiments I and II were conducted in a completely randomized factorial design consisted of two factors and three replications. In experiments I, the first factor was upland rice variety comprised of 10 varieties and the second factor was PEG concentration consisted of four levels. In experiment II, the first factor was upland rice varieties that responded the best to drought stress in experiment I, and the second factor was the drought stress treatment consisted of moisture content at 100, 75, 50 and 25% field capacity. The research was conducted at the Laboratory of Plant Physiology and Biotechnology and the greenhouse of Faculty of Agriculture, Sebelas Maret University (UNS) Surakarta. The results showed that the germination and vigor index decreased with increasing levels of PEG concentration. PEG concentration of 25 g L-1 of water was the most optimum for screening drought resistant upland rice. In experiment I, Towuti, Situ Patengang, Kalimutu and Gajah Mungkur varieties showed the best response to drought stress. Increased intensity of drought stress resulted in a reduction of plant height, number of tillers, dry weight, relative growth rate, leaf area, number of grains hill-1, 1000 grain weight, dry grain weight hill-1 and root dry weight. The drought stress also caused an earlier flowering date and increased percentage of empty grain. Based on the dry grain weight hill-1, Towuti exhibited a higher drought resistance level than Gajah Mungkur, Situ Patenggang and Kalimutu.

scholarly journals Determination of the best indirect selection criteria in Iranian durum wheat (Triticum aestivum L.) genotypes under irrigated and drought stress conditions

Genetika ◽  
2015 ◽  
Vol 47 (2) ◽  
pp. 549-558 ◽  
Author(s):  
Ahmad Golparvar ◽  
Mohammad Gheisari ◽  
Davoud Naderi ◽  
Ali Mehrabi ◽  
Amin Hadipanah ◽  
...  
Keyword(s):  
Drought Stress ◽  
Durum Wheat ◽  
Total Variation ◽  
Seed Yield ◽  
Stress Condition ◽  
Spike Density ◽  
Plant Seed ◽  
Wheat Genotypes ◽  
Drought Stress Condition ◽  
Yield Factor

In order to evaluate and classify morphological and morpho-physiological traits of durum wheat genotypes in drought and irrigated conditions 200 durum wheat genotypes were sown in modify augmented design with four replications during 2013- 2014 farming season. Two replications were considered as drought condition and two as irrigated. Factor analysis based on principal component analysis method and varimax rotation indicated that four important factors accounted for about 87 and 92 percent of the total variation among traits in drought and irrigated conditions, respectively. In drought stress condition, the first factor assigned 37 percent of total variation between traits and was significantly related with spike yield and it?s components. Therefore, this factor was regarded as spike seed yield factor. Other factors in drought stress condition accounted for 22, 16 and 12 percent of variation between traits and were entitled as plant seed yield, spike density and assimilate transmission factors, respectively. In irrigated condition, the first factor assigned 36 percent of total variation between traits and was significantly related with traits plant and spike seed yield, plant and spike harvest index, No. seed/spike and plant height. This factor was regarded as plant seed yield factor. Other factors in irrigated condition accounted for 24, 18 and 14 percent of variation between traits and were entitled as production, assimilate transmission and spike density factors, respectively. Overall, results revealed effect of different environments on extracted factors, percent of variation accounted for by factors and traits related with each factor.

scholarly journals Effects of drought stress on shoot development of tomato (Solanum lycopersicum L.)

2021 ◽  
Vol 5 (2) ◽  
pp. 1208-1215
Author(s):  
Tuan Minh Nguy ◽  
Thang Thanh Tran ◽  
Huong Thanh Tran
Keyword(s):  
Drought Stress ◽  
Stress Tolerance ◽  
Leaf Area ◽  
Stress Condition ◽  
Carotenoid Content ◽  
Shoot Height ◽  
Drought Stress Tolerance ◽  
Drought Stress Condition ◽  
Number Of Leaves ◽  
Effects Of Drought

In recent years, drought stress was strongly affected on the development and yield of tomatoes. There are increasing interests in the study of physiological transformations in adaption to stress in plants In this study, effects of drought stress (mannitol at different concentration) on the development of tomato shoot were studied. Morphological and physiological changes during the development of shoot under drought stress conditions were analyzed. Based on the analysis results, the combination of cytokinin and gibberellin was treated to increase the drought stress tolerance of plants. Results showed that mannitol at 20 g/L induced tomato drought stress. Shoot height, number of leaves, leaf area, and the number of roots significantly decreased in the drought stress condition compared to the control. The formation superoxide (O2-) and hydrogen peroxide (H2O2) occurred in the meristem, elongation region and cap of the roots in the drought stress condition instead of only cap root in the control. In the drought stress condition, there was an increase in respiration intensity, proline and carotenoid content, and abscisic acid activity. In contrast, the content of chlorophyll, photosynthesis intensity, cytokinin and gibberellin activity decreased in comparison with the control. The combination treatment of zeatin 0.5 mg/L and GA3 0.5 mg/L improved the drought stress tolerance of plants. The shoot height, number of leaves, leaf area and number of roots of the treated plants were higher than those of the control plants.

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