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Osmotic Adjustment in Wheat in Relation to Grain Yield under Water Deficit Environments

^a Plant Physiol. Lab., Potash Res. Inst. of India, Sector-19, Dundahera, Gurgaon-122016, Haryana, India
^b Aust. Cent. for Int. Agric. Res., GPO Box 1571, Canberra, ACT 2601, Australia
^c Int. Cent. for Improvement of Maize and Wheat (CIMMYT), Lisboa 27, Apdo Postal 6-641, 0660, Mexico, D.F., Mexico

View larger version (10K): [in a new window]   Fig. 1. Layout of the double line source experiment (Field Exp. 3). LS1 and LS2 represent the two line sources, lying in parallel 15 m apart. The 15-m block extended on each side of the two line sources comprised 75 plots arranged perpendicular to the sprinkler line. Each plot was 1.2 m wide carrying six rows. Numbers 1–5 represent the line source moisture levels. The moisture level nearest to the line source (Level 1) was assumed as the irrigated plot (control) as it received the maximum water applied by the line source. LS1 was activated every 10 d for 1 h throughout the crop season while LS2 started functioning similarly after anthesis.

View larger version (18K): [in a new window]   Fig. 2. Genetic variance and heritability of osmotic adjustment (OA), osmotic potential at full turgor (OP100), and turgor potential (TP) computed by the pooled analysis of variance across the six greenhouse experiments.

View larger version (22K): [in a new window]   Fig. 3. (A and B) Relationship of yield stability index (YSI) and drought susceptibility index (DSI) with grain yield attained at fifth moisture level (T5) of the line source, and (C) the relationship between YSI and DSI (n = 8) (Field Exp. 1).

View larger version (18K): [in a new window]   Fig. 4. Relationships of osmotic adjustment with (A) osmotic potential at full turgor and (B) turgor potential. All data points represent mean values across the six greenhouse experiments.