Genetic Variability Studies and Isolation of Transgressive Segregants Adaptable to Moisture Stress in Bread Wheat (Triticum aestivum L.) (Record no. 70769)

MARC details
000 -LEADER
fixed length control field 02687nam a2200205 4500
003 - CONTROL NUMBER IDENTIFIER
control field OSt
005 - DATE AND TIME OF LATEST TRANSACTION
control field 20250130145931.0
008 - FIXED-LENGTH DATA ELEMENTS--GENERAL INFORMATION
fixed length control field 250130b |||||||| |||| 00| 0 eng d
040 ## - CATALOGING SOURCE
Transcribing agency UAS Dharwad
041 ## - LANGUAGE CODE
Language code English
082 ## - DEWEY DECIMAL CLASSIFICATION NUMBER
Classification number 581.56
Author Label SAH
100 ## - MAIN ENTRY--PERSONAL NAME
Name of Author Sahithya B. Lakshmi
245 ## - TITLE STATEMENT
Title Genetic Variability Studies and Isolation of Transgressive Segregants Adaptable to Moisture Stress in Bread Wheat (Triticum aestivum L.)
260 ## - PUBLICATION, DISTRIBUTION, ETC.
Place of Publisher Dharwad
Name of Publisher University of Agricultural Sciences
Publication Year 2024
300 ## - PHYSICAL DESCRIPTION
Book Pages 143
Book Size 32 Cms
520 ## - SUMMARY, ETC.
Abstract. ABSTRACT<br/><br/> The study aimed to identify transgressive segregants with enhanced yield under moisture stress. The parents, UAS 375 (a rainfed variety), CWYT_609 (with strong root architecture), and HTWYT_66 (NDVI > 0.74 under stress), were hybridized to develop two populations: UAS 375 × CWYT_609 and UAS 375 × HTWYT_66. A total of 125 F3:4 progeny lines were evaluated under restricted irrigation during the Rabi 2023-24. Significant genetic variation among genotypes was observed, allowing for effective selection. Traits like peduncle length, flag leaf length, grains spike-1 and grain yield exhibited high heritability and genetic advance, suggesting additive gene action, making them ideal for direct selection. Positive but significant correlations between grain yield and traits such as plant height, peduncle length, flag leaf length, spike length, tillers per plant, 1000 grain weight and grains spike-1 indicated that improving these traits could boost yield under moisture stress. Early maturity was negatively associated with yield, suggesting that early-maturing varieties perform better in stress conditions. Path coefficient analysis revealed grains per spike (0.349) in the UAS 375 × CWYT_609 cross and 1000 grain weight (0.409) in the UAS 375 × HTWYT_66 cross as key traits for selection. Principal component analysis showed that four components explained 65.4 per cent of the variation in UAS 375 × CWYT_609 and three components explained 61.5 per cent in UAS 375 × HTWYT_66. Hence, carefully choosing genotypes from such groups can improve ability of wheat to survive moisture stress. Selection indices based on traits like plant height, grains spike-1, 1000 grain weight and grain yield resulted in high genetic gains and selection efficiency. Promising segregants, F4: 23-24 (77) in UAS 375 × CWYT_609 and F4: 23-24 (11) and F4: 23-24 (71) in UAS 375 × HTWYT_66, demonstrated high yields making them potential donor lines for breeding under moisture stress conditions.<br/>
650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM
Subject Genetics and Plant Breeding
700 ## - ADDED ENTRY--PERSONAL NAME
2nd Author, 3rd Author Uday G.
942 ## - ADDED ENTRY ELEMENTS (KOHA)
Koha Item type THESIS
Edition M.Sc. (Agri)
Classification part 581.56
Call number prefix SAH
Suppress in OPAC No
942 ## - ADDED ENTRY ELEMENTS (KOHA)
-- 581_560000000000000
999 ## -
-- 70769
-- 70769
Holdings
Withdrawn status Lost status Source of classification or shelving scheme Damaged status Not for loan Home library Current library Date acquired Total checkouts Full call number Barcode Date last seen Copy number Price effective from Koha item type
    Dewey Decimal Classification     University of Agricultural Sciences, Dharwad University of Agricultural Sciences, Dharwad 24/10/2024   581.56/SAH T14002 30/01/2025 1 30/01/2025 THESIS