STUDIES ON STABILITY ANALYSIS FOR GRAIN IRON AND ZINC CONCENTRATIONS IN RICE (Oryza sativa L.) GENOTYPES
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Date
2015
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PROFESSOR JAYASHANKAR TELANGANA STATE AGRICULTURAL UNIVERSITY, RAJENDRANAGAR, HYDERABAD
Abstract
The present investigation entitled “STUDIES ON STABILITY ANALYSIS
FOR GRAIN IRON AND ZINC CONCENTRATIONS IN RICE (Oryza sativa L.)
GENOTYPES” was undertaken with thirty seven rice genotypes including two checks
at three different locations situated at different agro-climatic regions of TELANGANA
viz., Directorate of Rice Research farm at ICRISAT, Medak (Central Telangana Zone),
Regional Agricultural Research Station, Jagtial (Northern Telangana Zone) and
Agricultural Research Station, Kampasagar (Southern Telangana Zone) for studying
stability for ten characters viz., days to 50 per cent flowering, plant height, panicle
length, number of productive tillers per plant, total number of grains per panicle,
number of filled grains per panicle, grain Iron content, grain Zinc content, 1000- grain
weight and grain yield per plant.
At three locations, the analysis of variance indicated significant variation among
the genotypes for all the characters studied. The pooled analysis of variance indicated
significant variation among the environments, genotypes and Genotype x Environment
interaction for all the characters studied. The significance of genotype and environment
interaction suggests that genotypes behaved differently in different environment.
The thirty seven Genotypes showed significant differences for all the characters,
when tested against pooled error and pooled deviation. It reveals that the selected
genotypes are having significant variation for all characters and may not showing
uniform performance in different environments. Environments showed highly
significant differences for all the characters under study except thousand grain weight, when tested against pooled error and panicle length, grain Iron content and 1000 grain
weight showed no significant differences, when tested against pooled deviation. It
reveals that wide difference between environments. Whereas, Genotype x Environment
interaction components showed highly significant differences for all the characters,
when tested against pooled error and days to 50% flowering, plant height, total number
of grains per panicle, grain zinc content and 1000 grain weight showed significantly
differences, when tested against pooled deviation. It indicates wide differential behavior
of genotypes in changing environments. The environment + (Genotype x Environment)
was significant for all the characters, when tested against pooled error and all the
characters shown significant differences except panicle length, number of filled grains
and grain iron content, when tested against pooled deviation. It is indicating distinct
nature of environments and genotype x environment interactions in phenotypic
expression. Significance of Environment (linear) component for all the characters
except Grain iron content, when tested against pooled error and panicle length, grain
iron content and 1000 grain weight showed no significant differences, when tested
against pooled deviation. It’s indicating that difference between environments and their
influence on genotypes for expression of these characters.
The Genotype x Environment (linear) interaction was significant for all
characters except panicle length, when tested against pooled error, while it was
significant for days to 50% flowering, plant height and 1000 grain weight when tested
against pooled deviation showed the significant differences. This indicated significant
differences among the genotypes for linear response to environments (bi) behavior of
the genotypes could be predicted over environments more precisely and G X E
interaction was outcome of the linear function of environmental components. Hence,
prediction of performance of genotypes based on stability parameters would be feasible
and reliable. The significant pooled deviations for all characters, when tested against
pooled error, indicates that the performance of genotypes is entirely unpredictable in
nature.
Based on environmental indices, the location ICRISAT is best among three
locations for grain yield, grain Zinc content and most of the yield traits. The same
location may be used for further studies to expect yield stability in rice in future.
Kampasagar is best location for grain Iron content.
Among the genotypes studied, the genotypes RPHP104 and RPHP 107 were
identified as the best genotypes at three locations, as they recorded highest mean for
grain yield per plant with highest 1000 grain weight, number of productive tillers per
plant and highest number of filled grains per panicle with moderate Iron and Zinc
content. The genotypes RPHP 91 and RPHP 92 recorded the highest grain Zinc content
along with moderate grain yield and 1000 grain weight. The mean performance of
genotype RPHP 106 is high for grain Iron content along with grain yield per plant and
1000 grain weight.
Among the genotypes studied for the stability analysis at three locations, the
genotype RPHP 103 and RPHP 104 showed stable performance for grain yield along
with moderate to high grain Zinc content. The genotype RPHP 106 showed stable performance for grain yield, grain Iron content, total number of grains per panicle and
panicle length based on Eberhart and Russell (1966) stability criteria.
Description
Keywords
genotypes, grain, environment, yields, animal husbandry, rice, planting, developmental stages, iron, zinc