Character association and stress indices for yield components in Saltol introgressed backcross inbred lines of rice (Oryza sativa L.)

Correlation, path coefficient and stress indices for yield and its components were studied in 32 Saltol introgressed backcross inbred lines (BIL) of rice along with a tolerant parent FL 478, susceptible check IR 29 and two recurrent parents viz., ADT 37 and CR 1009 Sub1 under normal and saline environments during rabi, 2016. Grain yield per plant showed positive significant association with all traits except 100 grain weight under normal environment and it showed positive significant association with all traits except panicle length, spikelet fertility and 100 grain weight under saline condition. The direct positive effects of number of tillers per plant, number of productive tillers per plant, number of filled grains per panicle and spikelet fertility on grain yield under normal and saline environment indicating direct selection of these traits would be effective for increasing grain yield. Under salinity, negative and significant association was shown by stress susceptibility index (SSI) and grain yield in contrast to positive and significant association shown by stress tolerance index (STI) and grain yield. These associations could be useful in identifying salt tolerant and sensitive high yielding genotypes. The lines viz., BIL 108, BIL 752, BIL 1101, BIL 1079, BIL 1094 and BIL 1095 had exhibited higher values of stress tolerance index in salinity.

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Studies on Correlation and Path Coefficient Analysis in Hybrid Rice (Oryza sativa L.) for Yield and Quality Traits

International Journal of Bio-resource and Stress Management ◽

10.23910/1.2021.2199 ◽

2021 ◽

Vol 12 (5) ◽

pp. 496-505

Author(s):

M. Vennela ◽

◽

B. Srinivas ◽

V. Ram Reddy ◽

N. Balram ◽

...

Keyword(s):

Grain Yield ◽

Path Analysis ◽

Plant Height ◽

Grain Weight ◽

Spikelet Fertility ◽

Path Coefficient ◽

Quality Traits ◽

Path Coefficient Analysis ◽

Kernel Length ◽

1000 Grain Weight

The present investigation was carried out at Regional Agricultural Research Station, Polasa, Jagtial, Telangana state, India to study the correlation and path coefficient analysis towards yield, physical and chemical quality traits in 46 genotypes including two checks in Randomized Block Design with two replications during kharif, october, 2019. Association of yield and yield components and among grain yield characters makes us to understand their relationship towards selecting a high yielding and good quality varieties. The result from the study revealed that all the nineteen characters studied has shown a great range of variation for correlation and path analysis. The character association studies in this experiment revealed that the trait grain yield plant-1 had showed significant positive correlation with plant height, spikelet fertility, 1000 grain weight, milling %, hulling %, kernel length and kernel breadth whereas it showed negative and non-significant association with days to 50% flowering. The path analysis studies revealed that kernel length was the major contributor for grain yield plant-1 followed by plant height, spikelet fertility, number of grains per panicle, 1000 grain weight, milling %, gel consistency, amylose content and alkali spreading value. These characters showed direct positive effects for grain yield plant-1. From the study it can be concluded that the above characters can be used directly as the selection criteria in any rice yield improvement breeding programmes.

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Morpho-physiological traits associated with heat stress tolerance in tropical maize (Zea mays L.) at reproductive stage

Australian Journal of Crop Science ◽

10.21475/ajcs.19.13.04.p1448 ◽

2019 ◽

Vol 13 ((04) 2019) ◽

pp. 536-545 ◽

Cited By ~ 2

Author(s):

Jewel Jameeta Noor ◽

M.T. Vinayan ◽

Shahid Umar ◽

Pooja Devi ◽

Muhammad Iqbal ◽

...

Keyword(s):

Heat Stress ◽

Grain Yield ◽

Stress Tolerance ◽

Inbred Lines ◽

Physiological Traits ◽

Optimal Temperature ◽

Tropical Maize ◽

Important Trait ◽

Heat Stress Tolerance ◽

Secondary Traits

Heat stress resilience has emerged as an important trait in maize hybrids targeted for post–monsoon spring cultivation in large parts of South Asia and many other parts of the tropics. Selection based on grain yield alone under heat stress is often misleading, and therefore an approach involving stress-adaptive secondary traits along with grain yield could help in the development of improved, stable heat stress tolerant cultivars. We attempted to identify reliable and effective secondary traits associated with heat stress tolerance in tropical maize and sources of heat stress tolerant germplasm. A panel of 99 elite maize inbred lines representing the wider genetic diversity of tropical maize and a set of 58 elite hybrids were phenotyped under natural heat stress and optimal temperature for grain yield and 15 secondary traits including 10 morpho-physiological traits and 5 yield attributes. Evaluation under natural heat stress was done during the spring season by adjusting the planting date so that the complete reproductive stage (from tassel emergence to late grain filling) was exposed to heat stress. The optimal temperature trial was planted during the monsoon season with no exposure to heat stress at any crop stage. Heat stress significantly affected most of the observed traits. Among the traits studied two yield attributing traits, i.e.- ears per plant (EPP) and kernel per row (KPR), and three morpho-physiological traits, i.e.- chlorophyll content (CC), leaf firing (LF) and tassel blast (TB) were found to be the key secondary traits associated with grain yield under heat stress. In addition, low anthesis-silking internal (ASI) is an important trait that needs to be added in the index selection for heat stress tolerance. The study identified nine promising heat stress tolerant maize inbred lines with desirable secondary traits and grain yield under severe heat stress, which could be used as source germplasm in heat stress tolerance maize breeding program.

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Assessing Genetic Diversity of Rice Varieties under Drought Stress Conditions

Notulae Scientia Biologicae ◽

10.15835/nsb315618 ◽

2011 ◽

Vol 3 (1) ◽

pp. 114-123 ◽

Cited By ~ 11

Author(s):

Mina ABARSHAHR ◽

Babak RABIEI ◽

Habibollah SAMIZADEH LAHIGI

Keyword(s):

Drought Stress ◽

Grain Yield ◽

Stress Tolerance ◽

Geometric Mean ◽

Minimum Variance ◽

Stress Conditions ◽

Productivity Index ◽

Stress Index ◽

Tolerance Index ◽

Rice Varieties

In order to compare different rice genotypes grown under drought stress conditions a field experiment was conducted. In this study thirty different genotypes of native, breeded and upland cultivars were evaluated. Analysis of variance showed significant differences among genotypes in respect of all vegetative and morphological traits. Genotypes were devided into three groups by cluster analysis based on all studied traits with minimum variance method (Wards Method). The total average indicates significant differences among groups in respect of all morphological and physiological characteristics. In addition, eight drought stress tolerance indices including: sensitivity to stress index (SSI), drought response index (DRI), relative drought index (RDI), tolerance index (TOL), mean productivity index (MP), stress tolerance index (STI), geometric mean productivity index (GMP) and harmonic mean index (HM) were calculated according to their grain yield under drought stress and normal conditions. In general, results of this experimnet revealed that, among rice cultivars Domsephid, Deylamany, Hasansaraei, Sadri, Anbarboo and Domsiah had the highest sensitivity referring to drought stress and produced the lowest grain yield. Also, genotypes of IR24 (breeded of IRRI), Nemat, Sephidroud, Kadoos and Bejar (breeded of Iran) and Vandana, upland cultivar (originally from India) had the highest tolerance to drought stress and produced the highest grain yield. In conclusion, it was suggested that, these cultivars are suitable for drought stress conditions and are appropriate for hybridization with the aim of increasing drought tolerance.

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Association and path coefficient analysis among grain yield and related traits in Ethiopian maize (Zea mays L.) inbred lines

African Journal of Plant Science ◽

10.5897/ajps2019.1784 ◽

2019 ◽

Vol 13 (9) ◽

pp. 264-272 ◽

Cited By ~ 1

Author(s):

Jilo Tadesse ◽

Tulu Leta

Keyword(s):

Zea Mays ◽

Grain Yield ◽

Zea Mays L ◽

Inbred Lines ◽

Path Coefficient ◽

Path Coefficient Analysis

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Evaluation of Yield-Based Low Nitrogen Tolerance Indices for Screening Maize (Zea mays L.) Inbred Lines

Agronomy ◽

10.3390/agronomy9050240 ◽

2019 ◽

Vol 9 (5) ◽

pp. 240 ◽

Cited By ~ 2

Author(s):

Zhixin Zhao ◽

Kunhui He ◽

Zhiqian Feng ◽

Yanan Li ◽

Liguo Chang ◽

...

Keyword(s):

Grain Yield ◽

Geometric Mean ◽

Inbred Lines ◽

Shaanxi Province ◽

High Yield ◽

Tolerance Index ◽

Heterotic Groups ◽

Maize Inbred Lines ◽

Low Nitrogen Tolerance ◽

Low Nitrogen

To screen the desired criterion to identify desirable genotypes and select genotypes best suited to limited nitrogen availability in order to facilitate the practice of low-nitrogen-tolerant breeding in maize, the response of 31 maize inbred lines, containing four control inbred lines (PH6WC, PH4CV, Zheng58, and Chang7-2) and others selected from the Shaan A and Shaan B heterotic groups cultivated at Northwest A&F University (Yangling, Shaanxi, China), were evaluated. The experiment was conducted following a split plot design with two replications during three growing seasons (2015, 2016, and 2017) under both high nitrogen (HN) and low nitrogen (LN) conditions at the Yulin and Yangling in Shaanxi Province, China. Seven screening indices, based on grain yield under two contrasting nitrogen (N) conditions, the stress susceptibility index (SSI), yield stability index (YSI), mean productivity (MP), geometric mean productivity (GMP), stress tolerance index (STI), harmonic mean (HM), and low nitrogen tolerance index (LNTI), were computed to assess the overall index that accurately screened the desirable genotypes. The results of the correlation analyses and principal component analysis showed that MP, GMP, HM and STI were correlated with grain yield significantly and positively under contrasting N conditions, and were able to accurately discriminate the desirable genotypes. Compared with the control inbred lines, many inbred lines selected from the Shaan A and Shaan B groups showed a higher LN tolerance. This shows that we can effectively improve the LN tolerance of maize inbred lines through LN screening. Based on the screening indices, the three-dimensional diagram and genotype and genotype × environment (GGE) biplots are agreed with this results, and we identified KA105, KB081, KA225, 91227, and 2013KB-47 as the desired genotypes that have the potential to be used to breed a high yield and stable hybrid.

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Character Association and Path Analysis for Yield Components and Biochemical Traits in Maize (Zea mays L.) Genotypes

Indian Journal of Agricultural Research ◽

10.18805/ijare.a-5723 ◽

2021 ◽

Author(s):

Prabhat Kumar Singh ◽

B. Sushma ◽

Nidhi Kumari

Keyword(s):

Grain Yield ◽

Block Design ◽

Standard Procedure ◽

Grain Weight ◽

Direct Selection ◽

Path Coefficient ◽

Biochemical Traits ◽

Internodal Length ◽

Selection For ◽

Positive Direct

Background: Grain yield is a complex character so direct selection for yield as such can be misleading. Keeping in view, the present study aimed to assess the path coefficient analysis with correlation coefficient technique to establish the direct and indirect relationship between the yield and its component. Methods: The present investigation carried out during kharif 2019 at Centurion University of Technology and Management, Odisha in randomized complete block design with 3 replication involving 20 maize genotypes. Data were collected from five randomly selected plnts on 20 agromorphic and biochemical traits. All the biochemical analysis estimated from leaf sample following standard procedure. Result: The traits shelled grain weight, cob diameter, number of grains per cob and anthesis silking interval were found to possess significant association in disirable direction with five ear weight at both genotypic and phenotypic levels. None of the biochemical trairts establishing significant positive association with yield. Highest positive direct effect on 5 ear weight was noticed by shelled grain weight (1.108) followed by phenols (0.115), internodal length (0.106) and days to 50 percent anthesis (0.102) indicating that the selection for these characters were likely to bring about an overall improvement in grain yield directly.

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Screening of Wheat (Triticum aestivum L.) Genotypes for Salt Tolerance on the Basis of Physiochemical Characteristics and Bio-Physiological Parameters and Indices

Revista de Chimie ◽

10.37358/rc.21.3.8438 ◽

2021 ◽

Vol 72 (3) ◽

pp. 71-80

Author(s):

Farzana Shaheen ◽

Zafar Iqbal Khan ◽

Tasneem Ahmad ◽

Muhammad Yaseen Ashraf ◽

Kafeel Ahmed ◽

...

Keyword(s):

Cluster Analysis ◽

Salt Tolerance ◽

Stress Tolerance ◽

Dry Weight ◽

Wheat Crop ◽

Tolerance Index ◽

Multivariate Techniques ◽

Stress Indices ◽

Wheat Genotypes ◽

Physiological Indices

Salt stress is a major threat for growth and development of wheat crop. Screening technique for salinity tolerance is an effective tool to identify tolerant cultivar and high yielding wheat genotypes. Present study was carried out to screen twenty wheat genotypes under laboratory terms utilizing various growth and physiological indices like plant fresh weight stress indices (PFSI), plant height stress tolerance index (PHSI), shoot length stress tolerance index (SLSI), germination stress tolerance index (GSI), plant dry weight stress indices (PDSI), root length stress tolerance index (RLSI), relative water content (RWC). Multivariate techniques like cluster analysis and correlation were used to analyze the variance between wheat genotypes. The correlations analysis indicated significant among different physiological indices like GSI, SLSI, RLSI, PFSI, PDSI and RWC. On the basis of cluster analysis 20 wheat genotypes were classified into three clusters: first cluster included (The genotype WL-711 was the premier scorer followed by Nifa Bathoor, ARRI-II and Millat-11) presents sufficient salt tolerating degree, on the other hand, cluster-2 is comprised of wheat genotypes (Inqilab-91, NIAB-09, Punjab-96, Sehar-2006, Tatara, AS-2002, SA-75, Lasani-09, FSD-08 and Galaxy-13) with medium level of salt tolerance and cluster-3 included genotypes (LU-26-S, Fakhar e Sarhad, Bakhtawar, Punjab-11, Barsat and Kohistan-97) did not perform upto the mark and have lower level of salt tolerance. Correlation analysis among different screening techniques indicated that physiological indices exhibited highly significant and positive correlations among GSI, PHSI, SLSI, PDSI, PFSI, and RWC while non-significant correlation existed among PDSI and RLSI. The correlation between PFSI and RWC was significant. Significant correlations between cluster analysis and different indices also proved that salt tolerant wheat genotypes screened.

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Study on relationship and selection index for yield and yield contributing characters in spring wheat

Journal of the Bangladesh Agricultural University ◽

10.3329/jbau.v8i2.7923 ◽

1970 ◽

Vol 8 (2) ◽

pp. 191-194

Author(s):

MF Ferdous ◽

AKM Shamsuddin ◽

D Hasna ◽

MMR Bhuiyan

Keyword(s):

Grain Yield ◽

Spring Wheat ◽

Selection Index ◽

Grain Weight ◽

Path Coefficient ◽

Path Coefficient Analysis ◽

Wheat Genotypes ◽

Selection Indices ◽

Days To Maturity ◽

The Relationship

The present study was conducted with twenty bread wheat genotypes at the experimental field of Bangladesh Agricultural University (BAU), Mymensingh, during the period from November 2008 to March 2009 to assess the relationship and selection index among yield and important yield attributing characters. Days to maturity, grains per spike, 100-grain weight and harvest index showed significant and positive correlation with grain yield per plant. Path coefficient analysis suggested that grains per spike followed by 100-grain weight and effective tillers per plant contributed maximum to grain yield positively and directly. Thus, selection based on these characters might be effective for improving grain yield. Selection indices were constructed through the discriminate functions using eight characters. From the results, the highest relative efficiency was observed with the selection index based on three characters; plant height and grains per spike and grain yield per plant. The present investigation indicates that the index selection based on these three characters might be more effective and efficient for selecting high yielding wheat genotypes. Keywords: Spring wheat; Relationship; Selection index; Yield contributing characters DOI: 10.3329/jbau.v8i2.7923 J. Bangladesh Agril. Univ. 8(2): 191-194, 2010

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