Faculty Opinions recommendation of Response to Direct Selection for Grain Yield under Drought Stress in Rice.

2008 ◽  
Author(s):  
Thomas Mitchell-Olds
Keyword(s):  
Drought Stress ◽  
Grain Yield ◽  
Direct Selection ◽  
Selection For

Response to Direct Selection for Grain Yield under Drought Stress in Rice

Crop Science ◽  
2007 ◽  
Vol 47 (1) ◽  
pp. 285-293 ◽  
Author(s):  
R. Venuprasad ◽  
H. R. Lafitte ◽  
G. N. Atlin
Keyword(s):  
Drought Stress ◽  
Grain Yield ◽  
Direct Selection ◽  
Selection For

scholarly journals Early generation selection strategy for yield and yield components in white oat

2005 ◽  
Vol 62 (4) ◽  
pp. 357-365 ◽  
Author(s):  
Giovani Benin ◽  
Fernando Irajá Félix de Carvalho ◽  
Antônio Costa de Oliveira ◽  
Claudir Lorencetti ◽  
Igor Pires Valério ◽  
...  
Keyword(s):  
Grain Yield ◽  
Indirect Selection ◽  
Grain Weight ◽  
Yield Potential ◽  
High Yield ◽  
Direct Selection ◽  
Selection Strategy ◽  
Breeding Method ◽  
Growing Seasons ◽  
Selection For

Several studies have searched for higher efficiency on plant selection in generations bearing high frequency of heterozygotes. This work aims to compare the response of direct selection for grain yield, indirect selection through average grain weight and combined selection for higher yield potential and average grain weight of oat plants (Avena sativa L.), using the honeycomb breeding method. These strategies were applied in the growing seasons of 2001 and 2002 in F3 and F4 populations, respectively, in the crosses UPF 18 CTC 5, OR 2 <FONT FACE=Symbol>´</FONT> UPF 7 and OR 2 <FONT FACE=Symbol>´</FONT> UPF 18. The ten best genetic combinations obtained for each cross and selection strategy were evaluated in greenhouse yield trials. Selection of plants with higher yield and average grain weight might be performed on early generations with high levels of heterozygosis. The direct selection for grain yield and indirect selection for average grain weight enabled to increase the average of characters under selection. However, genotypes obtained through direct selection presented lower average grain weight and those obtained through the indirect selection presented lower yield potential. Selection strategies must be run simultaneously to combine in only one genotype high yield potential and large grain weight, enabling maximum genetic gain for both characters.

Genetic loci responding to two cycles of divergent selection for grain yield under drought stress in a rice breeding population

Euphytica ◽  
2009 ◽  
Vol 167 (2) ◽  
pp. 261-269 ◽  
Author(s):  
R. Venuprasad ◽  
M. E. Bool ◽  
C. O. Dalid ◽  
J. Bernier ◽  
A. Kumar ◽  
...  
Keyword(s):  
Drought Stress ◽  
Grain Yield ◽  
Breeding Population ◽  
Divergent Selection ◽  
Rice Breeding ◽  
Genetic Loci ◽  
Selection For

Assessment of yield based selection under managed field stress condition for breeding for rice yield improvement under drought

Biologia ◽  
2013 ◽  
Vol 68 (4) ◽  
Author(s):  
Abhinav Jain ◽  
Padma Balaravi ◽  
Vinay Shenoy
Keyword(s):  
Drought Stress ◽  
Stress Condition ◽  
Rice Yield ◽  
Direct Selection ◽  
Rice Cultivars ◽  
The Past ◽  
Drought Tolerant ◽  
Selection For ◽  
Target Environment ◽  
Very High

AbstractThe progress in development and dissemination of drought tolerant lines has been slow as compared to the increasing drought prevalence in the rice growing regions. Significant amount of work has been done in the past on drought resistance traits in rice crop, still the benefit of improved drought tolerant rice cultivars reaching the farmer’s field is not very high and ways to expedite the development of drought tolerant and productive rice cultivars needs to be addressed. In this article, an assessment of easily practicable approach of managed stress screening and prospect of direct selection for yield under drought stress is discussed. Also the large effect yield QTLs identified for grain yield under drought stress field conditions is being reviewed for successful introgression into elite genetic background for developing drought tolerant cultivars with improved yield for the drought prone target environment.

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

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.

Approaches for enhancing grain yield of finger millet (Eleusine coracana)

2021 ◽  
pp. 1-9
Author(s):  
Y. A. Nanja Reddy ◽  
Jayarame Gowda ◽  
K. T. Krishne Gowda
Keyword(s):  
Grain Yield ◽  
Direct Effect ◽  
Photosynthetic Rate ◽  
Significant Contribution ◽  
Finger Millet ◽  
Direct Selection ◽  
Yield Improvement ◽  
Area Index ◽  
The Mean ◽  
Selection For

Abstract Finger millet is gaining importance as a food crop with the increasing emphasis on nutritional aspects and drought resilience. However, yield improvement has stagnated. Therefore, popular varieties have been examined for the purpose of whether direct selection for grain yield can be continued or an alternate trait-based approach using the germplasm is necessary. Direct selection for grain yield over the ruling variety, cv. GPU-28 (Germplasm Unit) has not been satisfactory. The path analysis has revealed a high direct effect of mean ear weight on grain yield followed by a moderate direct effect of photosynthetic rate and leaf area index. Furthermore, backward stepwise regression analysis revealed that among the independent traits, the mean ear weight made a significant contribution (60.8%) towards grain yield, followed by the photosynthetic rate (39.2%). The regression equation predicts the inclusion of mean ear weight by 1.0 g extra (as in GE-2672) to cv. GPU-28 will increase grain yield by 4.74%. The trait-specific genotypes are superior to the cv. GPU-28 were GPU-67 (photosynthetic rate) and GE-2672 (mean ear weight) and they could be used as donors for yield improvement. Future selection would aim for genotypes having 70–75 days for flowering with 4−5 productive tillers and mean ear weight of more than 8−9 g/ear. The possible approaches for enhancing grain yield are also discussed.

Direct Selection for Grain Yield under Moisture Stress in Oryza sativa cv. IR58025B × Oryza meridionalis Population

Crop Science ◽  
2012 ◽  
Vol 52 (2) ◽  
pp. 644-653 ◽  
Author(s):  
P. Kalmeshwer Gouda ◽  
C. Mohan Kumar Varma ◽  
S. Saikumar ◽  
B. Kiran ◽  
Vinay Shenoy ◽  
...  
Keyword(s):  
Oryza Sativa ◽  
Grain Yield ◽  
Moisture Stress ◽  
Direct Selection ◽  
Oryza Meridionalis ◽  
Selection For

scholarly journals Correlation and Path Analysis of Yield Components in Rice (Oryza sativa L.) under Irrigated and Reproductive Stage Drought Stress Condition

2020 ◽  
pp. 60-68
Author(s):  
Sadia Perween ◽  
Anand Kumar ◽  
Fariha Adan ◽  
Jitesh Kumar ◽  
Prince Raj ◽  
...  
Keyword(s):  
Drought Stress ◽  
Grain Yield ◽  
Path Analysis ◽  
Stress Condition ◽  
Reproductive Stage ◽  
Yield Attributes ◽  
Drought Stress Condition ◽  
Biological Yield ◽  
Selection For ◽  
Correlation And Path Analysis

Aim: The current experiment was conducted to study correlation and path analysis among morphological traits and their contribution towards yield under irrigated and drought stress condition using forty eight diverse rice genotypes. Study Design: The experiment was studied in three replications using Randomized Block Design. Place and Duration of Study: The research was carried out during Kharif 2018 at Rice Research Farm, Bihar Agricultural University, Sabour (Bhagalpur), India. Methodology: The experiment was conducted in two different sets; irrigated and drought stress condition. The yield and yield attributes were recorded under both the conditions to conduct the correlation and path analysis. Results: The analysis of variance revealed that genotypes significantly varied in yield and yield related traits. In addition, growth and yield attributes such as effective tillers per hill, biological yield, harvest index (%) and number of fertile grains per panicle were significantly and positively correlated with grain yield per plant under irrigated as well as reproductive stage drought stress condition. It was observed that total number of grains per panicle, number of fertile grains per panicle and biological yield had high positive direct effect on grain yield per plant in both irrigated (control) as well stress condition, indicating true relationship of these characters with grain yield and direct selection for these characters will be rewarding. In rest of the characters studied, correlation was mainly due to indirect effects through component characters and hence indirect selection will lead to yield improvement in rice. Conclusion: The potential for direct and indirect selection for reproductive stage drought stress tolerance using the associated characters may be useful to the breeder to formulate appropriate breeding plans for the selection of the genotype which tolerate high temperature condition.

scholarly journals SELECTION FOR THE DEVELOPMENT OF BLACK EYE COWPEA LINES

2018 ◽  
Vol 31 (1) ◽  
pp. 72-79 ◽  
Author(s):  
JÉSSICA DANIELE LUSTOSA DA SILVA ◽  
KAESEL JACKSON DAMASCENO-SILVA ◽  
MAURISRAEL DE MOURA ROCHA ◽  
JOSÉ ÂNGELO NOGUEIRA DE MENEZES JÚNIOR ◽  
VALDENIR QUEIROZ RIBEIRO
Keyword(s):  
Grain Yield ◽  
Block Design ◽  
Selection Index ◽  
Direct Selection ◽  
Selection Cycle ◽  
Lattice Design ◽  
Expected Gain ◽  
Selection For ◽  
New Cultivars ◽  
Selection Of

ABSTRACT Cowpea bean is a socioeconomically important legume that contribute to generate employment and income. This species presents great grain variability, and the commercial subclass black eye stands out as a very appreciated grain in Brazil and abroad, thus requiring the development of new cultivars. The objective of this work was to evaluate and select lineages of commercial black eye cowpea, based on simultaneous, and direct selection. First, 105 progenies and four controls were evaluated using the Federer's augmented block design. Seventy-seven progenies, selected from this evaluation-first selection cycle-and four controls were evaluated in three environments, using a simple 9×9 lattice design. Based on this evaluation, the second selection cycle was possible, resulting in 24 progenies. The gain by direct selection was lower than the predicted gain for grain yield in the first cycle, indicating that the selection was not effective. This result was probably due to the reduced genetic variability caused by the selection pressure. In the second cycle, the predicted and observed gains were similar, indicating that much of the expected gain was observed. The predicted and observed gains, with simultaneous selection based on the rank sum selection index, were similar in the first and second cycle. The simultaneous and direct selections resulted in genetic gains for grain yield in the two selection cycles, making it possible the selection of high grain yield lineages.

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