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Sabrao Journal of Breeding and Genetics, Volume 45, Issue 2, 2013, pp. 255-263

Screening of wheat genotypes for drought tolerance based on drought related indices

Abstract :

Germplasm comprising of 61 entries was evaluated at Barani Agricultural Research Institute, Chakwal, under drought and irrigated conditions during 2008-09 and 2009-10. Under irrigated field conditions, 3 irrigations (75 mm each) were applied in addition to seasonal rainfall (252.6 and 104.1) at three critical crop growth stages (40 days after planting, booting and grain-filling stage). No irrigation was applied under drought field conditions during both crop seasons; it was also protected from seasonal rains by using a rain shelter for 70 days from crop emergence. Morphological and physiological parameters were recorded along with droughtrelated indices such as drought tolerance efficiency (DTE) and drought susceptibility index (DSI) to evaluate the best performing lines under water stress conditions. The drought tolerant genotypes with the minimum yield reduction and highest DTE and lowest DSI were TE173/4/LEE/KVZ/3/CC/RON/CHA, DH-7, WC-15, ML-177 and DH-4 in 2008-09 while LLR-30, DH-4, LLR-42, 5C003, and DH-6 in 2009-10. Inqilab-91, DH- 11, DH-12, DH-8, DH-9 and WC-9 (in 2008-09) and DH-15, Inqilab-91, DH-20, LLR-8, DH-26 and WC-18 (in 2009-10) were the most drought-susceptible genotypes with maximum yield losses, lowest DTE, and highest DSI. © Society for the Advancement of Breeding Research in Asia and Oceania (SABRAO) 2013.

Keywords : Drought indices,Drought tolerance,Wheat physiology
Subject Area : Biotechnology Genetics Agronomy and Crop Science Animal Science and Zoology Horticulture

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