Selection indices to identify maize (Zea mays L.) hybrids adapted under drought-stress and drought-free conditions in a tropical climate

2016 ◽  
Vol 67 (10) ◽  
pp. 1087 ◽  
Author(s):  
Bhupender Kumar ◽  
Satish Kumar Guleria ◽  
Subhash M. Khanorkar ◽  
Rajender Babu Dubey ◽  
Jashvantlal Patel ◽  
...  
Keyword(s):  
Zea Mays ◽  
Drought Stress ◽  
Grain Yield ◽  
Zea Mays L ◽  
Tolerance Index ◽  
Yield Performance ◽  
Susceptibility Index ◽  
Drought Tolerant ◽  
Selection Indices ◽  
Stress Susceptibility

Drought stress is the most important production constraint in maize (Zea mays L.), especially in rainfed agriculture. To improve productivity of rainfed maize, the development of hybrids with tolerance to drought stress is an important objective in maize breeding programs. The present study was undertaken to identify maize hybrids that perform better under drought-stress and drought-free conditions by using various selection indices. These selection indices were calculated on the basis of yield (t ha–1) performance of hybrids measured under drought stress and optimum environments. A set of 38 cultivars was evaluated at 10 environments (representing five each of drought stress and optimum growing conditions). The average reduction in grain yield due to drought stress was 52%. Effects of genotype, environment and their interaction were significant sources of variation in determining grain yield, respectively explaining 5.0–7.4%, 55.0–60.2% and 12.0–15.0% of total variation in yield under drought-stress and drought-free conditions. Of eight selection indices considered for study, three indices such as harmonic mean, geometric mean, and stress tolerance index were identified as suitable for selection of genotypes capable of performing well both under drought-stress and drought-free environments. Drought response index and drought resistance index were found useful in identifying hybrids that performed better under drought stress. Stress susceptibility index was negatively correlated with yield measured under drought stress. Stress susceptibility index could be used as selection index but only in combination with yield performance data under water-deficit conditions in order to identify drought-tolerant hybrids with reasonable productivity. Test weight, shelling percentage, days to maturity, and ear girth were found to be useful traits for improving yield performance across diverse environments. Cultivation of identified drought-tolerant hybrids would be useful to enhance maize productivity in drought-stress environments.

scholarly journals Evaluation of Drought Tolerance Indices for Screening Some of Corn (Zea mays L.) Cultivars under Environmental Conditions

2013 ◽  
Vol 5 (3) ◽  
pp. 388-393 ◽  
Author(s):  
Mohhamad Reza NAGHAVI ◽  
Alireza POUR ABOUGHADAREH ◽  
Marouf KHALILI
Keyword(s):  
Zea Mays ◽  
Drought Tolerance ◽  
Stress Tolerance ◽  
Zea Mays L ◽  
Stress Conditions ◽  
Tolerance Index ◽  
Drought Tolerant ◽  
Drought Tolerance Indices ◽  
Stress Susceptibility ◽  
Tolerance Indices

In order to study the effect of drought stress on eight cultivars corn (Zea mays L.), an experiment was conducted in a factorial experimental on the basis of randomized complete block design under two irrigated conditions during 2010-2011 cropping season. Twelve drought tolerance/resistance indices including stress tolerance index (STI), stress susceptibility index (SSI), tolerance index (TOL), geometric mean production (GMP), mean production (MP), yield index (YI), yield stability index (YSI), drought resistance index (DI), relative drought index (RDI), stress susceptibility percentage index (SSPI) and modified stress tolerance (K1STI and K2STI) were calculated based on grain yield under drought and irrigated conditions. Yield in stress and non-stress conditions were significantly and positively correlated with STI, GMP, MP, YI, TOL, DI, RDI, YSI, SSPI, K1STI, and K2STI and negatively correlated with SSI. Yield in stress and non-stress conditions were significantly and positively correlated with STI, GMP, MP, YI, TOL, DI, RDI, YSI, SSPI, K1STI, and K2STI and negatively correlated with SSI. Screening drought tolerant cultivars using ranking method, three dimensional plots discriminated cultivars ‘KSC720’, KSC 710GT and ‘KSC 700’ as the most drought tolerant. Cluster analysis classified the cultivars into three groups i.e., tolerant, susceptible and semi-susceptible to drought conditions. In general, Results of this study showed that among drought tolerance indices STI, YI, SSPI, K1STI, and K2STI can be used as the most suitable indicators for screening drought tolerant cultivars and ‘KSC720’, KSC 710 GT and ‘KSC 700’ had the highest tolerance to drought in our studies condition.

scholarly journals Effective selection criteria for screening drought tolerant recombinant inbred lines of sunflower

Genetika ◽  
2013 ◽  
Vol 45 (1) ◽  
pp. 153-166 ◽  
Author(s):  
Nishtman Abdi ◽  
Reza Darvishzadeh ◽  
Hatami Maleki
Keyword(s):  
Inbred Line ◽  
Recombinant Inbred ◽  
Recombinant Inbred Lines ◽  
Geometric Mean ◽  
Inbred Lines ◽  
Harmonic Mean ◽  
Tolerance Index ◽  
Yield Performance ◽  
Drought Tolerant ◽  
Stress Susceptibility

In this study, seventy two sunflower recombinant inbred lines were tested for their yielding ability under both water-stressed and well-watered states. The inbred lines were evaluated in a rectangular 8?9 lattice design with two replications in both well-watered and water-stressed conditions, separately. Eight drought tolerance indices including stability tolerance index (STI), mean productivity (MP), geometric mean productivity (GMP), harmonic mean (HM), stress susceptibility index (SSI), tolerance index (TOL), yield index (YI) and yield stability index (YSI) were calculated based on grain yield for every genotype. Results showed the highest values of mean productivity (MP) index, geometric mean productivity (GMP), yield index (YI), harmonic mean (HM) and stress tolerance index (STI) indices for ?C134a? inbred line and least values of stress susceptibility index (SSI) and tolerance (TOL) for C61 inbred line. According to correlation of indices with yield performance under both drought stress and non-stress states and principle component analysis, indices including HM, MP, GMP and STI could properly distinguish drought tolerant sunflower inbred lines with high yield performance under both states. Cluster analysis of inbred lines using Ys, Yp and eight indices, categorized them into four groups including 19, 6, 26 and 19 inbred lines.

scholarly journals Analysis of Water Stress in Different Varieties of Maize (Zea mays L.) at the Early Seedling Stage

2020 ◽  
pp. 15-24
Author(s):  
Kiran Ramesh Pawar ◽  
Sopan Ganpatrao Wagh ◽  
Pravin Prakash Sonune ◽  
Sakshi Raju Solunke ◽  
Shubham Babanrao Solanke ◽  
...  
Keyword(s):  
Zea Mays ◽  
Water Stress ◽  
Drought Stress ◽  
Zea Mays L ◽  
Negative Impact ◽  
Morphological Variability ◽  
High Rate ◽  
Tolerance Index ◽  
Biochemical Tests ◽  
Maize Varieties

Maize (Zea mays L.) is a widely grown crop with a high rate of photosynthetic activity due to its C4 pathway leading to higher yields of grain and a potential for biomass. It is predominantly cross-pollinated crop, a feature that has contributed to its wide morphological variability and geographical adaptability. Abiotic stress such as drought stress negatively affects plant growth and development. The present study was designed to investigate the effects of drought stress on the morphological and biochemical content of seven different maize varieties. Here we have tested 7 different varieties of maize from the Marathwada region of Maharshtra, India. One week old plants have been affected by drought stress. After one week of drought stress, the plants were subjected to various morphometric and biochemical tests. The results showed that water stress treatment significantly affects root length, shoot length and fresh biomass of seven different varieties, i.e. TMMH 806, NMH 1008, DELTA 10V30, INDAM 1122, SRIKAR 3555, DKC 9141, SGA. Drought stress also had a negative impact on chlorophyll and proline content. Result further exhibited that based on drought tolerance index, variety SRIKAR 3555 could be ranked as drought tolerant and NMH 1008 as drought-sensitive, while remaining cultivator ranked as drought intermediates.

scholarly journals Estimation of drought tolerance among maize landraces from mini-core collection

Genetika ◽  
2014 ◽  
Vol 46 (3) ◽  
pp. 775-788 ◽  
Author(s):  
Violeta Andjelkovic ◽  
Natalija Kravic ◽  
Vojka Babic ◽  
Dragana Ignjatovic-Micic ◽  
Zoran Dumanovic ◽  
...  
Keyword(s):  
Drought Stress ◽  
Drought Tolerance ◽  
Grain Yield ◽  
Stress Tolerance ◽  
Core Collection ◽  
High Density ◽  
Tolerance Index ◽  
Mini Core Collection ◽  
Drought Tolerant ◽  
Maize Landraces

Global climate change, its impact on stable food production in the future and possibilities to overcome the problem are the major priorities for research. Breeding varieties with increase adaptability to changing environments, together with better tolerance/resistance to abiotic stress, pest and diseases are possible solution. Maize is one of the most important crops, with high grain yield reduction induced by drought stress. In the present study twenty-six maize landraces from drought tolerant mini-core collection were tested under optimal, drought, and a combination of drought and high density stresses in the field. Morphological traits, plant height, total number of leaves, leaf length, leaf width, anthesis-silking interval and grain yield were recorded for each entry in two replications in three experiments. Besides, drought tolerant indices were evaluated to test the ability to separate more drought tolerant accessions from those with less stress tolerance. Five stress tolerance indices, including stress tolerance index (STI), mean productivity (MP), geometric mean productivity (GMP), stress susceptibility (SSI), and stress tolerance (TOL) were calculated. Data analyses revealed that STI, MP and GMP had positive and significant correlations with grain yield under all conditions. Three-dimensional diagrams displayed assignment of landraces L25, L1, L14, L3, L26, L15 and L16 to group A, based on the stress tolerance index and achieved grain yield under optimal, drought stress, and a combination of drought and high density stress. A biplot analysis efficiently separated groups of landraces with different level of drought tolerance and grain yield. Based on all obtained results, maize landraces L25, L14, L1 and L3, as the most valuable source of drought tolerance, could be recommended for further use in breeding programs.

scholarly journals Evaluation of Bread Wheat (Triticum aestivum L.) Genotypes for Drought Tolerance through Selection Indices

2019 ◽  
Vol 7 ◽  
pp. 40-52
Author(s):  
Jawed Aslam Khyber ◽  
Faiza Soomro ◽  
Wahid Dino Sipio ◽  
Abdul Wahid Baloch ◽  
Jay Kumar Soothar ◽  
...  
Keyword(s):  
Water Stress ◽  
Drought Stress ◽  
Grain Yield ◽  
Bread Wheat ◽  
Flag Leaf ◽  
Stress Conditions ◽  
Tolerance Index ◽  
Yield Traits ◽  
Wheat Genotypes ◽  
Drought Tolerant

The current study was planned to identify drought tolerant bread wheat genotypes based on physiological and yield traits. In this context, a set of 12 genotypes (Sarsabz, NIA-Sundar, NIA-Amber, Sassui, Khirman, Marvi-2000, NIA-Sarang, Kiran-95, NIA-Sunheri, Bhittai, Bathoor-08 and Tatara) were evaluated under normal and water stress conditions. Mean squares from analysis of variance exhibited that genotypes, treatments and genotype x treatment interaction showed significant differences (P<0.05) for majority of the studied traits, indicating that there is significant variations are existed for physio-yield traits; therefore these genotypes may be preferred for further breeding programs in respect to drought stress. Regarding reduction percentage of genotypes under drought stress against normal water conditions, the minimum reduction was observed in Bathoor-08 for spike length and flag leaf area, Kiran-95 for grain yield plant, NIA-Sundar for seed index, Marvi-2000 for relative water content, Sarsabz for grains spike, whereas maximum but desirable reduction of stomatal dimension and density was displayed by Sarsabz and Tatara under water stress conditions, respectively. On the basis of drought tolerant indices, the genotypes Kiran-95, NIA-Sundar and Sarsabz showed lower values for tolerance index (TOL), trait stability index (TSI) and stress susceptibility (SSI), nevertheless it is believed that lower values of these indices show the less reduction in yield and its related traits due to water stress conditions hence can be tagged as tolerant genotypes for drought. Correlation results revealed that MP, SSI, TOL and TSI indices were correlated with grain yield under two conditions and they can be the appropriate indices for screening wheat genotypes.

scholarly journals Grain yield performance and flowering synchrony of CIMMYT’s tropical maize (Zea mays L.) parental inbred lines and single crosses

Euphytica ◽  
2016 ◽  
Vol 211 (3) ◽  
pp. 395-409 ◽  
Author(s):  
Mosisa Worku ◽  
Dan Makumbi ◽  
Yoseph Beyene ◽  
Biswanath Das ◽  
Stephen Mugo ◽  
...  
Keyword(s):  
Zea Mays ◽  
Grain Yield ◽  
Zea Mays L ◽  
Inbred Lines ◽  
Tropical Maize ◽  
Yield Performance ◽  
Flowering Synchrony ◽  
Parental Inbred
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