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Genetic analysis of medium duration rice genotypes for tolerance to iron toxicity in south central laterites of Kerala (Record no. 289772)

MARC details
000 -LEADER
fixed length control field	05096nam a22002057a 4500
082 ## - DEWEY DECIMAL CLASSIFICATION NUMBER
Classification number	630.28
Item number	ANA/GE PG
100 ## - MAIN ENTRY--PERSONAL NAME
Personal name	Anandhu Raj
245 ## - TITLE STATEMENT
Title	Genetic analysis of medium duration rice genotypes for tolerance to iron toxicity in 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	137p.
502 ## - DISSERTATION NOTE
Dissertation note	M Sc
520 3# - SUMMARY, ETC.
Abstract	The present study entitled “Genetic analysis of medium duration rice genotypes for <br/>tolerance to iron toxicity in South Central Laterites of Kerala” was conducted at Farming <br/>Systems Research Station, Sadanandapuram to evaluate and select rice genotypes tolerant <br/>to iron toxicity suited to South Central Laterites of Kerala during 2019-2021. The project <br/>was implemented as two experiments and in Experiment-I, initial evaluation of rice <br/>genotypes for iron toxicity tolerance was done as pot culture study. In Experiment-II, <br/>genotypes selected from experiment-1 was evaluated in paddy field where soil iron is at a <br/>toxic level.<br/>Thirty rice genotypes were collected from different research stations under KAU. Growing <br/>media consist of washed sand in polybags kept in plastic basins filled with Hoagland <br/>solution at different concentration (0,200,400,600 mgl-1<br/>) of iron at a constant pH of 4.0. <br/>Rice genotypes Uma, Karishma, Thekkan chitteni, Pournami, Panchami, Gouri, Bharati, <br/>Aiswarya, Asha, Pavithra and Samyuktha were selected from 30 genotypes screened in the <br/>laboratory based on morphological characters and iron toxicity score at highest iron <br/>concentration (600 mgl-1<br/>).<br/>Eleven rice genotypes were evaluated in field in iron toxicity affected field with pH <br/>(4.9) and iron content (544 mg kg-1<br/>), in randomized block design. Germinated seeds were <br/>sown in nursery and 21 days old seedlings were transplanted to main field. Seedlings were <br/>transplanted at a spacing of 20cm X 15cm. Agronomic practices which include lime <br/>application (600 kg ha-1<br/>) were carried out according to “Package of Practices <br/>Recommendation Crops 2016” of Kerala Agricultural University (KAU, 2016). A control <br/>block without lime application containing all treatments were maintained.<br/>The genotypes were evaluated for 33 characters including biometric and <br/>biochemical characters associated with iron toxicity tolerance. The genotypes showed <br/>significant differences for all the characters studied. Genetic parameter analysis was <br/>performed for 21 characters and for all the characters PCV values were higher than GCV <br/>values indicating the influence of environment. The phenotypic and genotypic coefficient <br/>of variation were maximum for straw yield per plant and minimum for days to 50% <br/>flowering. High heritability coupled with high genetic advance was observed for plant <br/>height, total number of tillers per plant, number of productive tillers per plant, panicle <br/>weight, sterility percentage, root length, grain yield per plant, straw yield per plant, number <br/>of fresh roots (20 DAT), iron content on root, iron content on 3rd leaf from tip, iron content <br/>in oldest fully opened matured leaf, iron content in grain, iron content in straw.<br/>Days to 50% flowering, number of tillers per plant, number of productive tillers per plant, <br/>panicle length, panicle weight, number of grains per panicle, number of filled grains per <br/>panicle, 1000 grain weight, root length and total number of roots(20 DAT) showed positive <br/>correlation with grain yield per plant. The path analysis provides information on <br/>contribution of traits by partitioning the total correlation into direct and indirect effects. <br/>Path analysis revealed highest positive direct effect of days to 50% flowering on grain yield <br/>per plant. Highest indirect effect of number of grains per panicle through days to 50% <br/>flowering.<br/>Cluster analysis aids in the selection of genetically divergent parents for hybridization <br/>programme which results in greater heterosis. Cluster analysis using Mahanalobis D2 <br/>statistic following Tocher’s method grouped the 11 genotypes into five clusters.Cluster I <br/>with 7 genotypes was the largest and cluster II, III, IV, V were solitary. Intra cluster <br/>distance was recorded only in cluster I (11.32). Highest intercluster distance observed <br/>between genotypes of cluster V and cluster II.<br/>The present study revealed that genotypes Panchami (6.4 t/ha) recorded maximum yield <br/>and was followed by Pournami (5.7 t/ha). These varieties can be recommended for iron <br/>toxic low land paddy fields of South Central Laterites of Kerala. Genotypes Panchami, <br/>Pournami, Uma, Karishma, Gouri and Pavithra recorded lowest leaf bronzing score at <br/>maturity under iron toxic field conditions. These genotypes can be used in breeding <br/>programmes to develop iron toxicity tolerant rice varieties.
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	Iron toxicity
650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM
Topical term or geographic name as entry element	Paddy fields
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/1/5810225576
942 ## - ADDED ENTRY ELEMENTS (KOHA)
Source of classification or shelving scheme	Dewey Decimal Classification
Item type	Theses

Holdings
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 ANA/GE PG	175437	01/08/2022	Theses