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Effects of Different Combination of Drought QTLs and their Physiological Response Under Controlled Moisture Stress Condition

K Baghyalakshmi , K Baghyalakshmi1 , S Ramchander2 , P Jeyaprakash3 , M Raveendran

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Indian Journal of Plant and Soil 6(2):p 73-77, July-December 2019. | DOI: DOI: http://dx.doi.org/10.21088/ijps.2348.9677.6219.2

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K Baghyalakshmi, S Ramchander, P Jeyaprakash, et al. Effects of Different Combination of Drought QTLs and their Physiological Response Under Controlled Moisture Stress Condition. Indian J Plant Soil. 2019;6(2):73–77.

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Abstract

Rice (Oryza sativa L.) being a water loving cereal crop, the water scaricity during the crop period is detrimental to the productivity. The present investiagation was undertaken to study the effect of different yield QTLs under drought and their physiological response to drought. Near-Isogenic Lines (NILs) of IR64 (CB-193 and CB-229) along with IR64, APO and the traditional rice variety Norungan were raised under both water stress and control condition. Infrared Gas Analyser (LICORModel LI 6400 version. 5) was used to observe the gas exchange parameters in each genotype both under control and stress condition in different intervals (52, 58, 66, 72 and 77 days after sowing) of stress induction with diverse moisture content. The reduction in moisture level in pot culture under stress condition minimizes the trait value of all gas exchange parameters viz., photosynthetic rate, stomatal conductance, transpiration rate, ratio between internal and atmospheric CO2 concentration (Ci/Ca) and relative water content in the leaf tissues. Among the genotypes studied, CB-229 (DTY2.2, DTY3.1 and DTY 8.1) had recorded higher photosynthetic rate and relative water content than the NIL CB-193 (DTY3.1 and DTY 8.1) under stress condition. This NIL also maintained the photosynthetic rate (reduction is minimum when stress increased) and relative water content as APO (72 and 77 DAS) when moisture stress is increased upto the lower level in pot culture. Relative water content was estimated by Weatherley (1950) method and expressed in percentage. Several biometrical traits were also observed in both under control and moisture stress condition. The overall study clearly visualized that the combination of three drought QTL line exhibited better performances with higher gas exchange parameter values than two QTL combination line which shown lesser response towards moisture stress.

Keyword: Rice; QTL; Near-Isogenic Lines; Drought and Relative Water Content.
 

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K Baghyalakshmi, S Ramchander, P Jeyaprakash, et al. Effects of Different Combination of Drought QTLs and their Physiological Response Under Controlled Moisture Stress Condition. Indian J Plant Soil. 2019;6(2):73–77.

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DOI: DOI: http://dx.doi.org/10.21088/ijps.2348.9677.6219.2

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