EDTA osmoticum - A heritable prognosis trait for drought resistance potential in sugarcane genotypes
1995
Dwidevi, R.S. | Srivastava, K.K. | Nigam, M. (Indian Inst. of Sugarcane Research Lucknow (India). Div. of Crop Physiology & Biochemistry)
EDTA osmoticum, dry matter production behavior and drop in the pH of EDTA leaf extract were examined in 21 genotypes of Saccharum complex represented by drought adapted wild lines, viz, S. spontaneum L., Erianthus sp., E. arundinaceus Jesw. and Schlerostachya sp. in conjugation with parents and their drought tolerant, moderately tolerant and drought sensitive cultivars, viz, Co 1148 and Lalari; CoS 770, Co 7717 and COLK 8102 and Saharanpuri Ponda and COLK 8901 respectively. Accumulation of EDTA osmoticum in drought adapted wild lines and drought tolerant, moderately tolerant and sensitive parents/cultivars were 1860-2660, 1310-1580 and 870-1080 micro g oxalic acid/g dry leaves respectively. This corresponded with 20.0-32.1 percent, 45.0-55.2 percent and 65.0-75.0 percent decline in dry matter yield at 1.00 MPa soil water stress. Like EDTA osmoticum, the drop in pH of EDTA extract of leaves also varied but the differences were not so marked. Consequently the genotypic and phenotypic coefficient of variations for EDTA osmoticum were noted to be 26.65 percent and 16.2 percent respectively resulting in 98.31 percent incheritance (h*[2)). A highly significant negative correlation of 0.9746 between dry matter decline and EDTA osmoticum content further supported the suitability of EDTA osmoticum for prognosis of drought resistance potential in sugarcane phenotypes.
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