scholarly journals Varietal Differences and Method of Selection for High-Temperature Stress Tolerance in Geranium (Pelargonium*hortorum Bailey)

2004 ◽  
Vol 6 (2) ◽  
pp. 57-63 ◽  
Author(s):  
Jingen Deng ◽  
Kana Hondo ◽  
Fumika Kakihara ◽  
Masahiro Kato
Keyword(s):  
High Temperature ◽  
Stress Tolerance ◽  
Temperature Stress ◽  
High Temperature Stress ◽  
Varietal Differences ◽  
Selection For

Assessment of wheat (Triticum aestivum L.) genotypes for high temperature stress tolerance using physico-chemical analysis

2020 ◽  
Vol 53 (2) ◽  
Author(s):  
Khalil Ahmed Laghari ◽  
Abdul Jabbar Pirzada ◽  
Mahboob Ali Sial ◽  
Muhammad Athar Khan ◽  
Jamal Uddin Mangi
Keyword(s):  
Triticum Aestivum ◽  
High Temperature ◽  
Chemical Analysis ◽  
Stress Tolerance ◽  
Temperature Stress ◽  
Triticum Aestivum L ◽  
High Temperature Stress ◽  
Physico Chemical

CHANGES IN ANTIOXIDANT ISOZYMES AS A BIOMARKER FOR CHARACTERIZING HIGH TEMPERATURE STRESS TOLERANCE IN RICE (ORYZA SATIVA L.) SPIKELETS

2012 ◽  
Vol 49 (1) ◽  
pp. 53-73 ◽  
Author(s):  
SMRUTI DAS ◽  
P. KRISHNAN ◽  
MONALISA NAYAK ◽  
B. RAMAKRISHNAN
Keyword(s):  
High Temperature ◽  
Stress Tolerance ◽  
Temperature Stress ◽  
Oryza Sativa L ◽  
High Temperature Stress ◽  
Spikelet Sterility ◽  
Antioxidant Metabolism ◽  
Different Temperatures ◽  
Temperature Exposure

SUMMARYHigh temperature stress at flowering can adversely affect rice yield, largely due to failure of fertilization. Oxidative damage can be a major reason inducing spikelet sterility in rice. In the present study, the effect of high temperatures on antioxidant metabolism in rice spikelets was characterised using nine different genotypes. Exposure to different temperatures at flowering stage revealed significant differences among various antioxidant enzymes in spikelets, both quantitatively and qualitatively. Spikelets of susceptible genotypes withstood temperature stress of up to 35 °C, those of moderately tolerant between 35 °C and 38 °C and those of tolerant genotypes up to 40 °C. Presence or absence, and changes in the isozyme intensities were consistent with alterations in their activities. Superoxide dismutase (SOD) isozymes II and III were present after exposure at 30 °C and 35 °C, while SOD I appeared above 40°C. Intensities of catalase isozymes I and III and the only isozyme of ascorbate peroxidase altered, while the only isozyme of guaical peroxidase and two (III and IV) of the four isozymes of catechol peroxidase disappeared after high temperature exposure of 45 °C. Thus, this work provides an evidence of the role of antioxidant metabolism in spikelets under high temperature stress conditions. Hence, changes in antioxidant isozymes in rice spikelets can be used as a biomarker for characterizing high temperature stress tolerance in rice spikelets.

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