Photosynthetic performance in improved KDML105 rice (Oryza sativa L.) lines containing drought and salt tolerance genes under drought and salt stress


Citation

Sanitchon Jirawat, . and Siangliw Meechai, . and Siangliw Jonaliza L., . and Toojinda Theerayut, . and Pamuta Dechudom, . and Theerakulpisut Piyada, . and Pengrat Jarunjit, . Photosynthetic performance in improved KDML105 rice (Oryza sativa L.) lines containing drought and salt tolerance genes under drought and salt stress. pp. 653-675. ISSN 1511-3701

Abstract

Rice (Oryza sativa L.) KDML105 is the most popular aromatic rice originating in Thailand. This cultivar is highly susceptible to abiotic stresses especially drought and salt stress during the seedling stage. The objective of this study was to investigate the photosynthetic performance in response to drought and salt stress of four improved breeding lines specifically CSSL94 and CSSL103 (containing drought-tolerant quantitative trait loci: DT-QTLs) and RGD1 and RGD4 (containing a salt-tolerance gene SKC1) with KDML105 (susceptible) and DH103 (tolerant to drought and salt stress) as the controls. Rice seedlings were grown for 21 days in hydroponic solutions and then exposed to salt stress (150 mM NaCl) or drought stress (20 PEG6000) for 10 days. The results indicated that when subjected to drought and salt stress all rice lines/cultivar exhibited significant reductions in net photosynthesis rate (PN) stomatal conductance (gs) transpiration rate (E) the maximal quantum yield of PSII photochemistry (Fv/Fm) the effective quantum yield of PSII photochemistry (Fv/Fm) photosynthetic pigments and SPAD readings whereas water use efficiency (WUE) and non-photochemical quenching (NPQ) increased. Compared with KDML105 CSSL94 and CSSL103 were more tolerant to both drought and salinity showing less reduction in all photosynthetic parameters. For RGD1 and RGD4 it was confirmed that these lines had a higher level of salt tolerance than KDML105 based on better photosynthetic performance under salt stress demonstrating that these lines were also more tolerant to drought stress.


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Abstract

Rice (Oryza sativa L.) KDML105 is the most popular aromatic rice originating in Thailand. This cultivar is highly susceptible to abiotic stresses especially drought and salt stress during the seedling stage. The objective of this study was to investigate the photosynthetic performance in response to drought and salt stress of four improved breeding lines specifically CSSL94 and CSSL103 (containing drought-tolerant quantitative trait loci: DT-QTLs) and RGD1 and RGD4 (containing a salt-tolerance gene SKC1) with KDML105 (susceptible) and DH103 (tolerant to drought and salt stress) as the controls. Rice seedlings were grown for 21 days in hydroponic solutions and then exposed to salt stress (150 mM NaCl) or drought stress (20 PEG6000) for 10 days. The results indicated that when subjected to drought and salt stress all rice lines/cultivar exhibited significant reductions in net photosynthesis rate (PN) stomatal conductance (gs) transpiration rate (E) the maximal quantum yield of PSII photochemistry (Fv/Fm) the effective quantum yield of PSII photochemistry (Fv/Fm) photosynthetic pigments and SPAD readings whereas water use efficiency (WUE) and non-photochemical quenching (NPQ) increased. Compared with KDML105 CSSL94 and CSSL103 were more tolerant to both drought and salinity showing less reduction in all photosynthetic parameters. For RGD1 and RGD4 it was confirmed that these lines had a higher level of salt tolerance than KDML105 based on better photosynthetic performance under salt stress demonstrating that these lines were also more tolerant to drought stress.

Additional Metadata

[error in script]
Item Type: Article
AGROVOC Term: Oryza sativa
AGROVOC Term: Rice
AGROVOC Term: Cultivars
AGROVOC Term: Plant cultivation
AGROVOC Term: Drought stress
AGROVOC Term: Salt tolerance
AGROVOC Term: Photosynthesis
Depositing User: Mr. AFANDI ABDUL MALEK
Last Modified: 24 Apr 2025 00:55
URI: http://webagris.upm.edu.my/id/eprint/9550

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