34-6 Identifying the Promising Drought Tolerant Genotypes Having High WUE Using Extreme Values of d 13C and d 18O Ratios.
See more from this Division: C02 Crop Physiology and Metabolism
See more from this Session: C-2/C4 Graduate Student Oral Competition - I
Monday, November 7, 2016: 9:15 AM
Phoenix Convention Center North, Room 225 B
Abstract:
High water use efficiency (WUE) genotypes could be used to improve drought tolerance under water-limited conditions. However, increased WUE is often associated with reduction in transpiration (T), which is often accompanied by a reduction in biomass. In this research, the 13C:12C 13C) and 18O:16O 18O) ratios were used as surrogate measurement for WUE and T, respectively. From a panel of 373 MG IV accessions, five genotypes from extreme groups having either high or low 13C and for having high or low 18O were chosen based on their phenotypic values and marker effects, similar to methods used in genomic selection. The study’s objective was to identify the genotypes with high WUE associated with relatively high T, and hence, high rate of biomass production. Growth chamber and field experiments were conducted to evaluate the different extremes under well-watered and drought conditions. In the growth chamber experiment, transpiration data, based on gravimetrical measurements, and WUE were estimated. Measured WUE in this study was positively correlated to both 13C and 18O. In the field experiment, canopy wilting and temperature were recorded. In the growth chamber experiment, significant difference in extreme groups and genotypes within group were observed. The genotype group having high 13C and high 18O also had higher WUE. From the field experiment, extreme group and genotypes within group showed significant differences for canopy temperature and wilting. Genotype PI567572B had both higher WUE and also had slower canopy wilting.
See more from this Division: C02 Crop Physiology and Metabolism
See more from this Session: C-2/C4 Graduate Student Oral Competition - I