Table 3.
Photosynthetic efficiency parameters (photosynthetic rate, stomatal conductance, and internal CO₂ concentration) in sweet sorghum genotypes under natural stem borer infestation at different sowing dates.
| Genotypes | Date of Sowing | Photosynthetic rate (µmol CO2 m-2 s-1) | Stomatal Conductance (mol H2O m-2 s-1) |
iCO2 (µmol mol-1) |
|---|---|---|---|---|
| SUGARGRAZE | 08.06.2024 | 19.26 ± 0.69aB | 0.17 ± 0.01aB | 145.67 ± 7.80aA |
| 22.06.2024 | 17.86 ± 0.86aB | 0.15 ± 0.01aB | 153.67 ± 11.29aA | |
| 06.07.2024 | 16.48 ± 0.71aB | 0.14 ± 0.01aB | 158.33 ± 9.56aA | |
| CSV 24SS | 08.06.2024 | 20.74 ± 0.47aAB | 0.19 ± 0.02aB | 116.67 ± 5.36bAB |
| 22.06.2024 | 18.40 ± 0.55abAB | 0.17 ± 0.01aB | 122.00 ± 7.57bAB | |
| 06.07.2024 | 17.43 ± 0.57bAB | 0.16 ± 0.01aB | 177.33 ± 8.11aAB | |
| SPV 3078 | 08.06.2024 | 22.19 ± 0.86aA | 0.20 ± 0.01aAB | 108.33 ± 14.75aBC |
| 22.06.2024 | 21.21 ± 0.27aA | 0.18 ± 0.02abAB | 119.67 ± 14.17aBC | |
| 06.07.2024 | 16.49 ± 1.03bA | 0.17 ± 0.01bAB | 134.33 ± 6.57aBC | |
| SPV 3083 | 08.06.2024 | 23.45 ± 0.64aA | 0.26 ± 0.01aA | 96.00 ± 8.72aC |
| 22.06.2024 | 19.87 ± 0.38bA | 0.18 ± 0.01bA | 113.67 ± 13.59aC | |
| 06.07.2024 | 17.86 ± 0.69cA | 0.17 ± 0.01bA | 120.00 ± 10.12aC |
Each value represent mean ± SE of triplicates; means followed by different lowercase letters indicate significant differences among dates of sowing, while means followed by different uppercase letters indicate significant differences among genotypes at p ≤ 0.05.