scholarly journals COMBINING ABILITY ANALYSIS OF PHYSIOLOGICAL TRAITS AND GRAIN YIELD IN MAIZE UNDER HEAT STRESS

2018 ◽  
Vol 55 (02) ◽  
pp. 295-301
Author(s):  
Hafiz Muhammad Wasif Ali
Keyword(s):  
Heat Stress ◽  
Grain Yield ◽  
Combining Ability ◽  
Physiological Traits ◽  
Combining Ability Analysis

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

2019 ◽  
Vol 13 ((04) 2019) ◽  
pp. 536-545 ◽  
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.

Inheritance of Grain Yield and Other Quantitative Traits in Maize

1977 ◽  
Vol 13 (3) ◽  
pp. 253-256 ◽  
Author(s):  
B. S. Dhillon ◽  
Joginder Singh
Keyword(s):  
Grain Yield ◽  
Combining Ability ◽  
Narrow Sense Heritability ◽  
Environmental Interactions ◽  
Grain Moisture ◽  
Maize Varieties ◽  
Combining Ability Analysis ◽  
Main Components ◽  
Very High

SUMMARYCombining ability analysis was carried out on diallel crosses of 20 yellow maize varieties in four environments. General combining ability variance (σ2g) was of greater importance than specific combining ability (σ2s) in the inheritance of all traits except grain yield and ear length, where the reverse was true. Interaction components (σ2ge, σ2se) were greater than the respective main components (σ2g, σ2s) for grain yield. The study brought out the prominent role of genotype-environmental interactions. Heritability in the broad sense was very high for all traits except grain yield and grain moisture, and narrow sense heritability was also high for all traits except grain yield and ear length.

COMBINING ABILITY ANALYSIS OF DROUGHT TOLERANCE IN WHEAT OVER DIFFERENT WATER REGIMES

2001 ◽  
Vol 48 (4) ◽  
pp. 353-361 ◽  
Author(s):  
E. Farshadfar ◽  
M. Farshadfar ◽  
J. Sutka
Keyword(s):  
Chlorophyll Fluorescence ◽  
Drought Tolerance ◽  
Grain Yield ◽  
Combining Ability ◽  
Relative Water Content ◽  
Harvest Index ◽  
Environment Interaction ◽  
Combining Ability Analysis ◽  
Rainfed Conditions ◽  
Relative Water

To study the properties of some drought tolerance criteria and  agronomic characters in wheat, an eight-parental diallel cross, excluding reciprocals, was grown in a randomized complete block design with three replications under two different water regimes (irrigated and rainfed) for two years in the College of Agriculture at Razi University, Kermanshah, Iran. High broad-sense heritability estimates were observed for harvest index, grain yield, and earliness. Additive gene action was found to be predominant for grain yield, harvest index, relative water content and chlorophyll fluorescence. The results of combining ability analysis revealed that Plainsman was the best general combiner and Plainsman × Kobomugi was the best specific combination for improving drought tolerance. The pooled analysis of variance for combining ability over rainfed conditions reflected that the GCA × environment interaction was not significant for harvest index and chlorophyll fluorescence, and the SCA × environment interaction was  non-significant for relative water content and relative water loss, indicating that genes controlling osmoregulation and the other physiological traits mentioned are not affected in these varieties by different rainfed conditions and hence show static stability.

Combining Ability Analysis of RILs Developed from a YML32 × Q11 Cross for Grain Yield and Resistance to Gray Leaf Spot

Crop Science ◽  
2018 ◽  
Vol 58 (3) ◽  
pp. 1070-1081 ◽  
Author(s):  
Z. W. Li ◽  
L. Liu ◽  
Y. D. Zhang ◽  
D. P. Jeffers ◽  
M. S. Kang ◽  
...  
Keyword(s):  
Grain Yield ◽  
Combining Ability ◽  
Leaf Spot ◽  
Gray Leaf Spot ◽  
Combining Ability Analysis

Combining Ability Analysis for Grain Yield and Its Component Traits in Linseed (Linum usitatissimum L.)

2018 ◽  
Vol 31 (4) ◽  
pp. 1-12
Author(s):  
Ram Balak Prasad Nirala ◽  
Neha Rani ◽  
Shiv Shankar Acharya ◽  
Ramanuj Vishwakarma ◽  
Tushar Ranjan ◽  
...  
Keyword(s):  
Grain Yield ◽  
Linum Usitatissimum ◽  
Combining Ability ◽  
Linum Usitatissimum L ◽  
Combining Ability Analysis ◽  
Component Traits

scholarly journals Variance components of combining ability for different morpho-physiological traits for heat tolerance in bread wheat

2017 ◽  
Vol 9 (3) ◽  
pp. 1338-1342
Author(s):  
Amarjeet Kumar ◽  
Swati Swati ◽  
N. K. Singh ◽  
Birendra Prasad ◽  
Anil Kumar
Keyword(s):  
Heat Stress ◽  
Grain Yield ◽  
Chlorophyll Content ◽  
Bread Wheat ◽  
Heat Tolerance ◽  
Climate Scenario ◽  
Kernel Weight ◽  
Grain Weight ◽  
Physiological Traits ◽  
Physiological Characters

To estimate the level of heat tolerance for different genotypes of bread wheat with respect to morphological characters under studied grains/ spike, grain weight/spike, grain filling duration (duration between the anthesis stage and the physiological maturity), 1000-kernel weight and grain yield/plant for yield. Physiological traits like relative injury (RI %), chlorophyll content, canopy temperature depression (CTD), were used in present investigation to contribute toward capability of plants to tolerate heat stress of the yield contributing traits during heat stress.The findings of present investigation had clearly explained that influences of environments on morpho physiological characters i.e. grain yield per plant (14886.15) and its attributing traits i.e. spike length (459.7), tillers per plant (622.34), spikelets per spike (278.1), 1000 kernel weight (13262.39), grain weight per spike (177.89) and number of grains per spike (2898.44) in wheat were highly significant and positive. Among the parent and their crosses had handsome amount of variations across the environment. The results of interaction for environments with parents, lines, testers and their crosses with respect to morpho physiological characters in wheat was found significant for some characters while variation was absent for other characters studied. Physiological traits like relative injury per cent, chlorophyll content and CTD were vital parameters to quantify the degree of heat stress to develop tolerant genotypes which is urgent and present need under changing climate scenario.

scholarly journals Combining Ability and Heterosis for Agronomic and Yield Traits in Indica and Japonica Rice Crosses

2018 ◽  
Vol 10 (12) ◽  
pp. 92 ◽  
Author(s):  
M. E. Yuga ◽  
J. M. Kimani ◽  
P. M. Kimani ◽  
M. F. Olubayo ◽  
J. W. Muthomi ◽  
...  
Keyword(s):  
Grain Yield ◽  
Combining Ability ◽  
Gene Action ◽  
Genetic Enhancement ◽  
F1 Hybrids ◽  
Japonica Rice ◽  
Yield Traits ◽  
Combining Ability Analysis ◽  
Days To Maturity ◽  
Check Variety

Understanding genetic variability and mode of gene action for agronomic and yield related traits is important in formulation of effective rice breeding program for genetic enhancement of grain yield. Combining ability analysis and heterosis was conducted to identify yield associated traits from nine male indicas and three female japonicas, together with their 27 F1 hybrids. Four parental lines, including Basmati 370, Basmati 217, K2-54 and Komboka showed good general combining ability in days to 50% flowering, days to maturity, number of tillers plant-1, number of spikelet’s panicle-1, number of panicles plant-1, number of filled grains panicle-1, and grain yield. While the combine K2-9 × Komboka, K2-9 × Basmati 370, K2-54 × Dourado Precoce and K2-54 × Basmati 217 showed specific good for grain yield. The hybrids K2-9 × Basmati 370, K2-8 × Basmati 217, K2-54 × Basmati 217 and K2-9 × Komboka showed 20% excess in standard check variety, suggesting that they could be good breeding donors.

scholarly journals Combining ability analysis in bread wheat (Triticum aestivum (L.) Em. Thell) under different environmental conditions

2019 ◽  
Vol 48 (1) ◽  
pp. 85-93
Author(s):  
Vijay Sharma ◽  
NS Dodiya ◽  
RB Dubey ◽  
Rumana Khan
Keyword(s):  
Grain Yield ◽  
Bread Wheat ◽  
Combining Ability ◽  
Gene Action ◽  
Flag Leaf ◽  
Triticum Aestivum L ◽  
Pooled Analysis ◽  
Combining Ability Analysis ◽  
Component Traits ◽  
Diverse Origin

Pooled analysis of 8 genotypes of wheat of diverse origin, their 28 F1s and 2 checks was carried out in 4 different environments to study the combining ability in bread wheat for grain yield and its component traits. On pooled basis, analysis of variance due to GCA and SCA was significant for all characters revealed difference between parents for GCA and difference between crosses for SCA. Similarly, mean square due to GCA × E was significant for number of effective tillers per plant and flag leaf area revealed influence of environment on GCA. Whereas SCA × E was also significant for number of effective tillers per plant and grain yield per plant revealed influence of environment on SCA. The variance due to GCA was higher than their respective SCA for all characters except number of grains per spike indicating that additive type of gene action played role in the expression of all these traits. Significant GCA effects for grain yield and its component traits were exhibited by the parents HD 2987, Lok 1 and HI 1544. Fourteen crosses recorded showed significant SCA effects for grain yield and related traits.

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