scholarly journals Selection indices for enhanced selection efficiency in Indian mustard under terminal heat stress conditions

2020 ◽  
Vol 80 (01) ◽  
Author(s):  
Surinder K. Sandhu ◽  
Pritpal Singh ◽  
Jasneet Kaur ◽  
Manpreet Singh ◽  
Karanveer Kaur
Keyword(s):  
Heat Stress ◽  
Seed Yield ◽  
Selection Index ◽  
Indian Mustard ◽  
Significant Loss ◽  
C3 Plant ◽  
Stage Of Development ◽  
Selection Indices ◽  
Terminal Heat Stress ◽  
Efficiency Of Selection

With global increase in temperature, terminal heat stress (THS) has emerged as a major challenge in food crops. Indian mustard (Brassica juncea L. Czern and Coss), C3 plant, grows well at 15-20°C. Heat stress at seedling as well as at flowering stage leads to enhanced vegetative growth and flower abortion leading to loss in seed yield. Late sowing after cotton and rice harvest expose the crop to high temperature stress during reproductive stage of development. A fixed diversity stock of 486 Indian mustard lines were evaluated under delayed planting conditions to expose the crop to THS for two consecutive years. Selection indices were computed using four different combinations of traits via Kang_SAS Path computer program along with expected genetic advance (GA) at 5% selection intensity. Set1, comprised of five traits viz., plant height (PH), number of secondary branches (NSB), number of siliquae on main shoot (NSMS), seed yield (SY) and 1000-seed weight (TSW) were recorded the highest GA (8.612) in comparison to other trait combinations tested in present study. Other important finding was slight difference in GA of set I (8.612; SY included) and set II (8.599; SY excluded) with efficiency of selection index 131% and 130%, respectively. This recommended that in initial breeding generations (F2/F3), a breeder may base his selection on four yield related traits (PH, NSB, NSMS and TSW) only without significant loss in genetic gains. This will save resources and time of breeders to compute seed yield. This is the first report on computation of selection index for efficient simultaneous selection under THS in Indian mustard.

scholarly journals Genetic study of terminal heat stress in indigenous collections of Indian mustard (Brassica juncea L.) germplasm

2022 ◽  
Vol 43 (1) ◽  
pp. 161-169
Author(s):  
H.K. Sharma ◽  
◽  
V.V. Singh ◽  
A. Kumar ◽  
H.S. Meena ◽  
...  
Keyword(s):  
Heat Stress ◽  
Seed Yield ◽  
Seed Weight ◽  
Block Design ◽  
Geometric Mean ◽  
Indian Mustard ◽  
Zone Length ◽  
Terminal Heat Stress ◽  
Heat Tolerant ◽  
Selection Of

Aim: The present study was carried out to evaluate 145 genotypes of Indian mustard for terminal heat stress under late sown irrigated conditions. Methodology: One hundred and forty five genotypes of Indian mustard were evaluated for terminal heat tolerance, along with six checks in augmented block design. The effect of heat stress was assessed on different agro-morphological traits. Data were recorded on five randomly selected plants for 12 different quantitative traits for each genotype. Results: Terminal heat stress caused significant reduction in performance of all traits, except oil content and fruiting zone length. Seed yield per plant showed highest reduction (33.92%) followed by 1000-seed weight (21.28%). Thousand-seed weight and secondary branches per plant were found associated with seed yield under late sown conditions. Based on yield under stress, yield index, geometric mean productivity and stress tolerance indices, five lines viz., DRMR-59, DRMR-2094, DRMR-2129, DRMR-2071, DRMR-2136 were identified as high yielding and terminal heat stress tolerant. Whereas, based on heat stress susceptibility index, DRMR-1347, DRMR-1154, DRMR-1190 were top performing lines tolerant to terminal heat stress. Interpretation: Selection of high yielding lines under stress condition can be done using correlated traits. Yield under stress was found significantly correlated with YSI, YI, MP, STI and GMP suggesting to use these indices for selection of high yielding and heat tolerant lines. However, further re-validation is very much needed for effective use of these indices for selection of heat tolerant lines in Indian mustard.

Effect of sampling errors on efficiency of selection indices. 2. Use of information on associated traits for improvement of a single important trait

1976 ◽  
Vol 23 (1) ◽  
pp. 1-14 ◽  
Author(s):  
Jill Sales ◽  
W. G. Hill
Keyword(s):  
Selection Index ◽  
Heritability Estimate ◽  
Parameter Estimates ◽  
Response To Selection ◽  
Sampling Errors ◽  
Estimation Of Parameters ◽  
Selection Indices ◽  
Important Trait ◽  
Selection For ◽  
Efficiency Of Selection

SUMMARYAn analysis is undertaken of the effect of errors in estimates of parameters on the response to selection for an economically important trait (trait 1) when one or more additional traits are added in a selection index. The detailed analysis is confined to one additional trait (trait 2) which contributes useful information unless the genetic and phenotypic regressions of trait 1 on trait 2 are equal.If there are errors in parameter estimates the extra response obtained by including trait 2 will usually be over-predicted. When trait 2 actually contributes no useful information the predicted benefit equals the real loss in efficiency from its inclusion.The loss in efficiency from poor estimation of parameters, whether or not the second trait makes a contribution, is roughly one-quarter of the squared coefficient of variation of a heritability estimate of trait 1 in the same experiment.

scholarly journals Response of antioxidative system of Brassica juncea (L.) Czern. to terminal heat stress

2020 ◽  
Vol 49 (4) ◽  
pp. 1185-1188
Author(s):  
Narender Mohan ◽  
Nisha Kumari ◽  
Minakshi Jattan ◽  
Ram Avtar ◽  
Babita Rani ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Hydrogen Peroxide ◽  
Ascorbic Acid ◽  
Heat Stress ◽  
Indian Mustard ◽  
Concomitant Increase ◽  
Maximum Increase ◽  
Stress Indicators ◽  
Terminal Heat Stress ◽  
Oxidative Stress Indicators

A differential response to terminal heat stress was observed on enzymatic and non-enzymatic components of antioxidant system of two thermo-tolerant genotypes viz., RGN-368 & RH-1566 and two thermo-sensitive genotypes viz., RH-1134 & RH-0749 in leaves of Indian mustard. The antioxidative enzymes viz., superoxide dismutase, peroxidase, catalase, ascorbate peroxidase and glutathione reductase showed higher activity in leaves of two thermo-tolerant genotypes as compared to thermo-sensitive. Terminal heat stress resulted in concomitant increase in non-enzymatic components like carotenoids, ascorbic acid and proline in all the genotypes but maximum increase was observed in thermo-tolerant genotypes. A remarkable accumulation was observed in oxidative stress indicators i.e., malondialdehyde, hydrogen peroxide and electrolyte leakage in all the genotypes, whereas, significant increase was observed in thermo-sensitive genotypes as compared to thermo-tolerant. It is inferred that leaves of thermo-tolerant genotypes tend to attain greater capacity to perform reaction of antioxidative pathway under the condition of terminal heat stress to combat thermo-induced oxidative stress.

Agronomic performance of autumn- and winter-cropped Indian mustard (Brassica juncea L.) in response to varying levels of nitrogen fertiliser

2020 ◽  
pp. 83-95
Author(s):  
Bent Al-Hoda Asghari ◽  
Mohsen Yousefi ◽  
Katarzyna Możdżeń ◽  
Joanna Puła ◽  
Peiman Zandi ◽  
...  
Keyword(s):  
Brassica Juncea ◽  
Seed Yield ◽  
Agronomic Traits ◽  
Growth Parameters ◽  
Indian Mustard ◽  
Climatic Conditions ◽  
Plant Seed ◽  
Nitrogen Fertiliser ◽  
Nitrogen Levels ◽  
Cropping Seasons

Indian mustard (Brassica juncea L. Czern) cultivation is suggested for regions with short seasons and low rainfall. Although there have been many studies conducted on agronomic production of mustard in Iran, the information regarding the interactive impact of cropping seasons and nitrogen fertiliser on growth characteristics and yield quality of mustard plant is still insufficient and requires further investigation. This study focused on the possible implications of different cropping seasons and different nitrogen levels on selected agronomic traits in mustard. In this experiment, five different doses of nitrogen and two sowing periods were used to assess for their combined effects on the growth parameters, seed yield and agronomic characteristics of mustard in the semi-arid climatic conditions of Takestan. The results revealed that cultivation seasons and nitrogen rates had a significant effect on plant height, biomass yield, number of siliques per plant, seed oil content and seed yield.

Combining Ability of Plant Height and Yield components in Indian Mustard (Brassica junceaL.Czern & Coss.) under Salt affected Soil using Line×Tester Analysis

2016 ◽  
Vol 3 (2) ◽  
Author(s):  
SHAILESH CHAND GAUTAM ◽  
MP Chauhan
Keyword(s):  
Plant Height ◽  
Seed Yield ◽  
Combining Ability ◽  
Yield Components ◽  
Indian Mustard ◽  
Heritability Estimate ◽  
Genetic Effects ◽  
Narrow Sense ◽  
Narrow Sense Heritability ◽  
Additive Genetic Effects

Line × tester analysis of twenty lines and three testers of Indian mustard (Brassica juncea L. Czern & Coss.) cultivars were used to estimate general combining ability (GCA), specific combining ability (SCA) effects, high parent heterosis and narrow-sense heritability estimate for plant height, yield components and seed yield. Significant variance of line x tester for the traits like pods per plant and seed yield indicating non additive genetic effects have important role for controlling these traits. Significant mean squares of parents v/s crosses which are indicating significant average heterosis were also significant for all the traits except seeds per pod. High narrow-sense heritability estimates for all the traits except seeds per pod exhibited the prime importance of additive genetic effects for these traits except seeds per pod. Most of the crosses with negative SCA effect for plant height had at least one parent with significant negative or negative GCA effect for this trait. For most of the traits except pods per plant, the efficiency of high parent heterosis effect was more than SCA effect for determining superior cross combinations.

Sign in / Sign up

Export Citation Format

Share Document