Identification of superior genotypes for water stress tolerance in rice (Oryza sativa L.) for south central laterites of Kerala (Record no. 289770)
[ view plain ]
| 000 -LEADER | |
|---|---|
| fixed length control field | 05301nam a22001937a 4500 |
| 082 ## - DEWEY DECIMAL CLASSIFICATION NUMBER | |
| Classification number | 630.28 |
| Item number | ARA/ID PG |
| 100 ## - MAIN ENTRY--PERSONAL NAME | |
| Personal name | Aravind Krishnan R |
| 245 ## - TITLE STATEMENT | |
| Title | Identification of superior genotypes for water stress tolerance in rice (Oryza sativa L.) for south central laterites of Kerala |
| 260 ## - PUBLICATION, DISTRIBUTION, ETC. (IMPRINT) | |
| Place of publication, distribution, etc | Vellayani |
| Name of publisher, distributor, etc | Department of Plant Breeding and Genetics, College of Agriculture |
| Date of publication, distribution, etc | 2022 |
| 300 ## - PHYSICAL DESCRIPTION | |
| Extent | 146p. |
| 502 ## - DISSERTATION NOTE | |
| Dissertation note | M Sc |
| 520 ## - SUMMARY, ETC. | |
| Abstract | he present investigation entitled “Identification of superior genotypes for water <br/>stress tolerance in rice (Oryza sativa L.) for south central laterites of Kerala” was conducted <br/>at Farming Systems Research Station, Sadanandapuram, Kottarakkara during 2019-21 with <br/>an objective to identify and characterize the traditional as well as released rice genotypes <br/>of Kerala for water stress tolerance using phenotypic and biochemical markers, suitable for <br/>south central laterites of Kerala.<br/>The study comprised of thirty genotypes collected from RARS, Pattambi, <br/>Department of Seed Science and Technology, College of Agriculture, Vellanikkara, KAU, <br/>Thrissur and ICAR- NBPGR, New Delhi. Study was conducted in two experiments viz.<br/>laboratory and field study.<br/>In the first experiment (Experiment-I), thirty genotypes were evaluated for moisture <br/>stress tolerance at seedling stage for seven different morpho-physiological characters viz.<br/>Germination percentage, speed of germination, root length, shoot length, seedling dry <br/>weight, seedling vigor index 1 and seedling vigor index 2 in laboratory using PEG 6000 <br/>(Polyethylene Glycol- 6000) at five different concentrations of 0, 5, 10, 15, 20 percentage <br/>(%). The study was conducted in factorial completely randomized design, replicated thrice<br/>and the twenty-one tolerant genotypes were selected for field study. <br/>In the second experiment (Experiment-II), twenty-one best performing genotypes <br/>including the high performing standard check variety Apo in randomized block design <br/>were selected and evaluated in the field where irrigation was withheld for 10 days at critical <br/>growth stages. The seeds were sown on raised beds of 4 m2<br/>size at a spacing of 20 cm х 20 <br/>cm and cultural operations were adopted as per the “Package of Practices (2016)” of Kerala <br/>Agricultural University. Genotypes were evaluated for twenty-four characters which <br/>included different biometric, physiological and biochemical observations. Significant <br/>difference was observed among genotypes for all the characters studied in both field and <br/>laboratory experiments.<br/>Genetic parameter analysis was performed for 21 characters and for all the <br/>characters PCV values were higher than GCV values indicating the influence of <br/>environment. The phenotypic and genotypic coefficient of variation were maximum for <br/>recovery after stress release and minimum for days to 50 % flowering. Heritability was <br/>high for all the characters except leaf rolling score and genetic gain was high for all the <br/>selected characters. <br/>Correlation studies revealed significant positive correlation for all the selected <br/>characters except spikelet sterility, which exhibited significant negative correlation with <br/>grain yield. Path analysis conducted for eleven characters showed significant correlation <br/>with grain yield and also revealed that relative water content recorded high positive direct <br/>effect on grain yield. High positive indirect effect on grain yield was recorded by grain <br/>weight per panicle via spikelet sterility.<br/>Genetic divergence analysis using Mahanalobis D2 statistic following Tocher’s <br/>method grouped the twenty-one genotypes into five clusters. Cluster II with 10 genotypes <br/>was the largest followed by cluster I (8 genotypes) and cluster III, IV, V were solitary. The <br/>highest intra cluster distance was recorded among the genotypes of cluster II. Whereas <br/>highest inter cluster distance was observed between the genotypes of the clusters I and V. <br/>Among the selected characters, the relative contribution towards the genetic divergence <br/>was much higher for root length.<br/>In the present investigation, genotypes Parambuvattan, Apo, Vaisakh and <br/>Chuvannavattan were identified as the best water stress tolerant ones under PEG induced <br/>stress conditions based on various seedling parameters during laboratory experiment. <br/>While, field evaluation of the genotypes Vaisakh, Karanavara, Karuthadukkan, <br/>Kattamodan, Parambuvattan and Onamottan exhibited good and comparable grain yields <br/>with the Universal drought tolerant check Apo under field level drought conditions.<br/>Thus, it can be concluded that Parambuvattan, Karanavara, Karuthadukkan, <br/>Kattamodan and Onamottan were recognised as best performing genotypes capable for<br/>moisture stress tolerance despite the performance of universal check, Apo and high <br/>yielding Vaisakh. The best performing genotypes identified in the study can be <br/>recommended for upland cultivation in south central laterites of Kerala and also for <br/>molecular analysis in future rice breeding programs by Kerala Agricultural University. |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name as entry element | Plant Breeding and Genetics |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name as entry element | Rice |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name as entry element | Oryza sativa |
| 700 ## - ADDED ENTRY--PERSONAL NAME | |
| Personal name | Bindu M R (Guide) |
| 856 ## - ELECTRONIC LOCATION AND ACCESS | |
| Uniform Resource Identifier | https://krishikosh.egranth.ac.in/handle/1/5810217183 |
| 942 ## - ADDED ENTRY ELEMENTS (KOHA) | |
| Source of classification or shelving scheme | Dewey Decimal Classification |
| Item type | Theses |
| Not for loan | Collection code | Home library | Current library | Shelving location | Date acquired | Full call number | Barcode | Date last seen | Koha item type |
|---|---|---|---|---|---|---|---|---|---|
| Not For Loan | Reference Book | KAU Central Library, Thrissur | KAU Central Library, Thrissur | Theses | 01/08/2022 | 630.28 ARA/ID PG | 175439 | 01/08/2022 | Theses |