Role of γ-amino butyric acid against stripe rust in wheat (Triticum aestivum L.)
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Date
2021
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Punjab Agricultural University, Ludhiana
Abstract
PBW 725 was found the most resistant cultivar against stripe rust in a screen of seven
wheat cultivars under field conditions. GABA applications improved the performance of all
seven cultivars against stripe rust. PBW 725 (resistant) and HD 2967 (susceptible) were
compared for antioxidant, phenolic, GABA, and carbohydrate metabolisms at 1, 2, and 4 d of
GABA, Puccinia striiformis. sp. tritici (Pst), GABA+Pst given to 30-d old seedlings growing
in the greenhouse. Fold increase of SOD, APX, GR, GPX, and GST was higher at 1 d in PBW
725 while at 4 d in HD 2967. H2O2 increased at 1 d but decreased at later stages in HD 2967,
while PBW 725 maintained H2O2 level during the stress period. PBW725 sustained CAT,
DHAR, MDHAR, soluble-POX/PPO, lignin, phenolics, and flavonoids, while HD 2967
became deficient at the late stage Pst. An early increase of lignin was seen in leaves of PBW
725 only. Glucanase and chitinase increased by a significant amount at the late stage of Pst in
HD 2967 only. Compared to PBW 725, starch decreased earlier and glucose utilized by more
amount in leaves while starch hydrolyzed poorly, and fructose, sucrose, and proline became
deficient in roots in HD 2967 under Pst. Compared to PBW 725, glutamate decarboxylase,
diamine oxidase, and GABA increased poorly in HD 2967 under Pst. Proteases increased only
in HD 2967 at earlier stages but decreased by 4 d of Pst. Protein levels became low by 4 d of
Pst in HD 2967 only. Toxicity as hydroxyl, malondialdehyde and protein carbonyls increased
only in HD 2967 and raised more in roots than leaves under Pst. GABA improved all studied
metabolisms in both cultivars under non-stressed as well as stressed conditions. Toxicity
decreased, and defense increased on the application of GABA in HD 2967 under stripe rust.
Results concluded that stress response over time is related to resistance against stripe rust.
Antioxidant sustainability during the stress period, sugar to starch interconversions, and
GABA-shunt activity may be the components of resistance. GABA applications can improve
stripe rust resistance in wheat.
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Citation
Parmdeep Singh (2021). Role of γ-amino butyric acid against stripe rust in wheat (Triticum aestivum L.) (Unpublished Ph.D. Dissertation). Punjab Agricultural University, Ludhiana, Punjab, India.