GENETIC EVALUATION AND SELECTION CRITERIA OF UPLAND RICE (Oryza sativa L.) FOR PHYSIOLOGICAL TRAITS UNDER REPRODUCTIVE STAGE DROUGHT STRESS

A.K. SINGH¹, V.N. SINGH², A.K. MALL³*, N.K. SINGH⁴, A. DUBEY⁵, P.K. SINGH^6
1N.D. University of Agriculture and Technology, Kumarganj, 224 229, Uttar Pradesh, India
²N.D. University of Agriculture and Technology, Kumarganj, 224 229, Uttar Pradesh, India
³ICAR-Indian Institute of Sugarcane Research, Lucknow, 226 002, Uttar Pradesh, India
⁴N.D. University of Agriculture and Technology, Kumarganj, 224 229, Uttar Pradesh, India
⁵N.D. University of Agriculture and Technology, Kumarganj, 224 229, Uttar Pradesh, India
⁶N.D. University of Agriculture and Technology, Kumarganj, 224 229, Uttar Pradesh, India
* Corresponding Author : Ashutosh.Mall@icar.gov.in

Received : 16-05-2017     Accepted : 07-06-2017     Published : 30-06-2017
Volume : 9     Issue : 30       Pages : 4438 - 4445
Int J Agr Sci 9.30 (2017):4438-4445

Keywords : Upland rice, Drought, Physiological traits, Direct and indirect selection parameters
Conflict of Interest : None declared
Acknowledgements/Funding : Authors are obliged to Vice-Chancellor and Dean of N.D. University of Agriculture & Technology, Kumarganj, Faizabad, 224 229, Uttar Pradesh for providing the facilities for conduction of experiment.
Author Contribution : All authors made substantial contributions to conception and design, acquisition of data, analysis and interpretation of data; Authors participate in drafting the article or revising it critically for important intellectual content.

The present investigation, attempt has been made to combine different type of germplasm in order to identifying the physiological basis of genetic variation in drought tolerance. The High estimates of PCV and GCV were observed for sterile grains per panicle, root dry weight, root volume, root length and fertile grains per panicle under both the conditions High estimates of heritability and genetic advance were recorded for water potential, fertile grains panicle-1, sterile grains panicle-1, straw yield, total biomass at flowering, total biomass at maturity, ACR, root length, root volume and grain yield under both the conditions. Thus, selection practiced for these characters in plant materials under study may be expected to be highly fruitful for isolating high yielding genotypes for irrigated/drought environments. The other traits would be unreliable indices for improvement through selection due to existence of low to moderate transmissibility along with low variability. None of the morpho-physiological traits appeared as strong associates of grain yield in irrigated control condition, whereas four traits, namely, straw yield, panicle length, total biomass at maturity and total biomass at flowering were found to be strong associates of grain yield in water stress condition. In overall consideration, soluble sugar upper root and starch at re-watering in control condition and starch in leaf, starch at re-watering and chlorophyll a in stress condition emerged as most important direct yield components owing to their high order positive direct effects at phenotypic as well as genotypic level.

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