Evaluation of Drought Tolerant Lines of Rice (Oryza sativa L.) Obtained Through MAS under Rainfed and Control Condition
Loading...
Date
2013
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
JNKVV
Abstract
ABSTRACT
The present investigation entitled “Evaluation of drought tolerant lines of rice (Oryza sativa L.) obtained through MAS under rainfed and condition” was carried out with the objectives to estimate genetic parameters of variability, heritability, genetic advance for morphological traits. The character association to identify the stable genotype by stability analysis among ninety one drought tolerance genotypes conducted in the three environments viz. control condition, ranfed condition and reproductive stress condition were studied. The experiment was conducted at College of Agriculture, Rewa under Rice Improvement Project with these genotypes in randomized block design with two replications during Kharif 2012-13.
Observations were recorded on the basis of five random competitive plants selected from each drought tolerance genotypes in every replication for morphological traits e.g. days to fifty percent flowering, plant height (cm), panicle length (cm), tiller/hill, biological yield /meter (g), panicle weight /meter, no. of panicles /meter, grain weight /meter, grain yield /plot (g), harvest index (%) and thousands grain weight (g), were evaluated as per standard procedure.
The mean data estimated were subjected to analysis of variance as per the Randomized Block Design. Analysis of data revealed highly significant difference among genotypes for all traits in all environments.
The coefficients of phenotypic and genotypic variability were high for panicle weight per meter,(g) no. of panicles meter-1, grain weight per meter(g), grain yield per plot (g), harvest index (%), (All Env.), and the coefficients of phenotypic and genotypic variability were moderate for plant height(cm) and biological yield per plot(g) (All Env.).
The estimate of genetic advance as percentage of mean at five per cent selection intensity recorded were high for corrector, plant height(g), panicle weight per meter(g), no. of panicles meter-1, grain weight per meter(g), grain yield per plot (g), harvest index (%), (All Env.), biological yield per meter(g) (E1).
High heritability accompanied with high genetic advance indicated predominance of additive gene action for the traits viz., plant height, no. of panicle per meter, panicle weight per meter, grain weight per meter, grain yield per plot, harvest index (All Env.), biological yield per plot (E1, E2).
The characters like plant height, panicle length, days to fifty percent flowering, thousands grain weight, harvest index should be considered during selection for developing high yielding stable breeding lines.
The favourable environment for most of the economic traits is observed to be control condition (E1) followed by rainfed condition(E2), reproductive stress condition (E3) based on bi and s2di maximum number of genotypes revealed greater stability to all the environments for panicle length, thousands grain weight, harvest index, days to fifty percent flowering and plant height also other traits.
In the present investigation genotype x environmental interactions of stability analysis was significant for grain yield per plot, biological yield per plot plant height when tested against pooled error. However, analysis of variance for stability revealed significance of variance due to environment (linear) for all the above characters and G x E (linear) was significant for plant height, thousands grain weight, grain yield per plot, harvest index. Pooled deviations were also found to be significant for all the eleven characters.
The genotypes IR86991-B-192-B for days to 50% flowering, IR86918-B-124-B, IR86991-B-108-B for plant height, IR86918-B-319-B for biological yield per meter and IR86929-B-244-B for grain yield per meter were found to be stable.
The genotypes IR86918-B-117-B, IR869992-B-216-B, IR86931-B-148-B, IR86931-B-332-B, IR86918-B-17-B, IR86929-B-262-B, IR86931-B-522-B, IR86918-B-124-B, IR86929-B-262-B, IR86931-B-91-B, IR86929-B-108-B, IR86918-B-45-B, IR86929-B-456-B and IR86918-B-90-B were suitable for unfavourable environments for the character days to 50% flowering, tillers per hill, biological yield per meter, grain weight per meter, grain yield per plot, harvest index and test weight respectively.
The breeding lines IR86918-B-239-B, IR86929-B-178-B, IR86929-B-183-B, IR86929-B-482-B, IR86929-B-392-B, IR86929-B-326-B, IR86931-B-186-B, IR86931-B-273-B, IR86931-B-528-B, IR86931-B-273-B, APO, IR86931-B-30-B and IR86931-B-91-B were found to be suitable for favourable environments for the character plant height, panicles length, tillers per hill, biological yield per meter, panicles weight per meter, grain weight per meter, grain yield per plot, harvest index and test weight respectively.
***