Hefny, M.M. and Metwali, E.M.R. and Mohamed, A.I. (2013) Assessment of genetic diversity of sorghum (Sorghum bicolor L. Moench) genotypes under saline irrigation water based on some selection indices. Australian Journal of Crop Science, 7 (12). pp. 1935-1945.
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Abstract
Genetic improvement for salt tolerance is of high importance due to the extent and the constant increase in salt affected areas. Sorghum has been considered relatively more salt tolerant than maize and has the potential as a grain and fodder crop for salt affected areas. In order to study the reaction of twenty two genotypes of sorghum to saline irrigation treatments (0.33, 6.25 and 9.37 dS m-1), a split-plot experiment was conducted under randomized complete block design with three replications. The results showed that sorghum genotypes differed in their response to salinity levels, and genotypes G3, G8, G9, G20, and G14 recorded reasonable forage yield under saline and non-saline irrigation water treatments. Selection indices, ie; GMP (Geometric mean productivity), MP (Mean productivity), STI (Stress tolerance index) were more informative towards classification of better or superior genotypes with respect to tolerant and susceptible groups. In addition, these indices recorded positive correlations either with fresh and dry weights of shoots, root dry weight and K+ content or negative correlations with Na+ and Cl- contents and Na+/K+ ratio. Cluster analysis based on resistance indices discriminated the genotypes into three and four groups under 6.25 and 9.37 dS m-1, respectively. The genotypes with high STI, GMP and MP values were suitable for cultivation under saline and non-saline environments. In contrast, cluster with highest TOL (Tolerance Index) and SSI (Stress Sensitivity Index) is sensitive to saline irrigation and more suitable for non-saline conditions. Such genotypes are considered new valuable sources for sorghum breeding programs under saline affected areas
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Cluster analysis, salinity, selection indices, sorghum, fresh weight, ion content |
| Author Affiliation: | Department of Agronomy, Faculty of Agriculture, Suez Canal University, Ismailia 41522, Egypt |
| Subjects: | Crop Improvement |
| Divisions: | Sorghum |
| Depositing User: | Mr B Krishnamurthy |
| Date Deposited: | 16 Feb 2014 06:25 |
| Last Modified: | 16 Feb 2014 06:25 |
| Official URL: | http://search.informit.com.au/documentSummary;dn=6... |
| URI: | http://eprints.icrisat.ac.in/id/eprint/12544 |
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