Physiological Indices for Drought Tolerance in Stay-green Sorghum (Sorghum bicolor L. Moench) Accessions
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Date
2015-06
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Addis Ababa Universty
Abstract
Drought is one of major stress factor, which results in a profound effect on plant growth and yield. The effect becomes severe mainly where rainfed agriculture practiced. Having this thought, assessing of genotypes that can better tolerate such condition and methods that can help for screening are important in reducing associated yield loss. The study was carried out at Addis Ababa University, College of Natural Science, Addis Ababa in glasshouse using randomized complete block design (RCBD) with 3 replications. Five Sorghum accessions Sorcoll 141/07, Sorcoll 146/07, Sorcoll 163/07, Sorcoll 060/07 and E36-1 (check) were used and grown under well watered and post- flowering water stress condition. Data were collected for growth parameters of specific leaf area (SLA) and specific leaf weight (SLW), Biochemical parameters such as leaf proline, total soluble sugar (TSS), leaf nitrogen (N%) and protein content yield per panicle and drought indices such as tolerance (TOL), mean productivity (MP), yield stability index (YSI), yield index (YI), stress tolerance index (STI), stress susceptibility index( SSI), geometric mean (GM) and harmonic mean (HM). Based on SLA and SLW value, Sorcoll 141/07 and Sorcoll 060/07 were observed to be drought tolerant. Proline, TSS, N, Protein, yield per panicle, TOL, SSI, MP, STI, GM, HM value had revealed Sorcoll 060/07 and E36-1 tolerant accessions whereas Sorcoll 146/07 was sensitive. Correlation result showed that there existed a positive and negative association of proline and SLW with yield at P < 0.05. Future studies will be required to assess the association of stress induced osmolytes with SG trait and QTL identification for better utilization of these traits in breeding program.
Key words/phrases: Sorghum; drought tolerance; growth and biochemical parameters; drought indices.
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Keywords
Sorghum, Drought tolerance, Growth and biochemical parameters, Drought indices