Evaluation of elicitor treatment on biochemical changes in cotton seedlings subjected to high temperature stress

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dc.contributor.advisorSangha, Manjeet Kaur
dc.contributor.authorHunjan, Harsimran
dc.date.accessioned2019-11-18T05:52:43Z
dc.date.available2019-11-18T05:52:43Z
dc.date.issued2019
dc.description.abstractIn the present study effect of elicitors; salicylic acid (SA, 50 ppm), calcium chloride (CaCl2, 50ppm), gibberellic acid (GA3, 5ppm) and succinic acid (100ppm recommended by PAU) on heat stress amelioration in seven day old cotton seedlings (Gossypium hirsutum - LH 2298 and LH 2076; Gossypium arboreum - LD 949 and LD 1019) was evaluated in terms of changes in morphophysiological, carbohydrate and protein status and oxidative and antioxidant parameters. High temperature (HT) stresswas given for 1 hr at 40, 45, 50 and 55°C to seven day old cotton seedlings. Seedlings of LH2298, LD949 depicted 50% survival at 55°C followed by LH 2076 (43%) and LD 1019 (41%). HT stress decreased the root and shoot length in seedling which got revived after recovery. Loss of moisture increased with increase in stress temperature. The chlorophyll content decreased from 26-37% with maximum decrease in LD 949. LH 2298 control had highest total carbohydrates, which were negatively affected by HT. The soluble sugars and soluble proteins registered increase. HT stress inceased electrolyte leakage, H2O2 as well as MDA content to minimum in LH 2298 and LD 949. Maximum increase in SOD, POD, APX and GR activity was seen in LH 2298 and LD949 whereas CAT activity declined after HT exposure. Proline, phenolics, ascorbic acid, tocopherols and carotenoids also depicted increase. Seed priming treatment with SA@50ppm was most effective in decreasing the negative effect of HT in terms of improving various estimated parameters in seven day old cotton seedlings, followed by treatment with CaCl2, succinic acid and GA. SA effect was demonstrated maximum in LH 2298 and LD 949. Priming treatment was more effective than seedling spray. In conclusion the given cotton genotypes showed heat tolerance with the order of tolerance as LH 2298>LD 949>LH 2076>LD 1019 and among the elicitors used, SA priming ameliorated the heat stress to maximum. The various parameters in cotton genotypes showed differential response towards heat stress.en_US
dc.identifier.urihttp://krishikosh.egranth.ac.in/handle/1/5810135546
dc.keywordsCotton, High temperature stress, Elicitor treatment, Biochemical changes, Oxidative and antioxidative statusen_US
dc.language.isoenen_US
dc.pages136en_US
dc.publisherPunjab Agricultural University, Ludhianaen_US
dc.research.problemEvaluation of elicitor treatment on biochemical changes in cotton seedlings subjected to high temperature stressen_US
dc.subBiochemistryen_US
dc.subjectnullen_US
dc.themeEvaluation of elicitor treatment on biochemical changes in cotton seedlings subjected to high temperature stressen_US
dc.these.typeM.Scen_US
dc.titleEvaluation of elicitor treatment on biochemical changes in cotton seedlings subjected to high temperature stressen_US
dc.typeThesisen_US
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