Leaf Thickness and Gas Exchange Parameters Render Differential Drought Tolerance in Rice (Oryza sativa L.) at the Flowering Stage

Leaf thickness plays a fundamental role in species strategies of resource use and acquisition. Gas exchange parameters and leaf thickness are important for maintaining drought tolerance in rice (Oryza sativa L.). A pot experiment was conducted by imposing drought stress (DS) on fourteen rice genotyp...

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Bibliographic Details
Published inEnvironment and ecology Vol. 40; no. 2B; p. 693
Main Authors Parida, S, Dash, G K, Subhashree, Das, Samal, K C, Swain, P
Format Journal Article
LanguageEnglish
Published Kalyani MKK Publications 01.04.2022
Subjects
Carbon dioxide
Carbon dioxide concentration
Carboxylation
Drought
Drought resistance
Field capacity
Flowering
Gas exchange
Genotypes
Leaf area
Oryza sativa
Parameter sensitivity
Rice
Stomata
Stomatal conductance
Thickness
Water use
Water use efficiency
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Summary:Leaf thickness plays a fundamental role in species strategies of resource use and acquisition. Gas exchange parameters and leaf thickness are important for maintaining drought tolerance in rice (Oryza sativa L.). A pot experiment was conducted by imposing drought stress (DS) on fourteen rice genotypes selected from a pool of 100 genotypes for determining drought tolerance. Five days before flowering, DS was imposed by withdrawing irrigation maintained at 50% field capacity, whereas non-stress pots were maintained at 100% field capacity. Our results showed that the genotypes Parijata, IC 516003, IC 516008 and IC 516149 were less affected by DS with higher values of specific leaf weight (SLW), leaf area (LA), membrane stability index (MSI), photosynthetic rate (Pn), stomatal conductance (gs), water use efficiency (WUE), intercellular CO2 concentration (Ci) and carboxylation efficiency (CE) associated with better mechanism for DS tolerance. The genotype Prasad was most susceptible to DS with low in gas exchange and leaf growth parameters and genotypes Lalat, Pathara and IR 36 showed intermediate response. Overall, the parameters studied were found to be highly sensitive to DS and therefore can be used in breeding programs for screening drought tolerant genotypes.
ISSN:0970-0420