Vol. 12, Issue 6 (2023)

Author(s):
AM Langhi, Patel Savankumar N, SR Patel and Hardik A Patel

Abstract:
In the present investigation, information on the magnitude of heterosis was obtained for seed yield per plant and its related components following line x tester mating design involving four lines and seven testers of sunflower (Helianthus annuus L.). The eleven parents and their 28 F₁s with two standard checks were tested for five characters in a randomized block design with three replications at Bharuch (Gujarat). The standard heterosis ranged from -7.82% (SVCMS-1 x SVSR-4) to 44.87% (SVCMS-4 x SVSR-4) over LSFH-171 for seed yield per plant. The highest standard heterosis was observed for head diameter in cross SVCMS-4 X SVSR-4 (30.60). The maximum value of seed volume weight in cross SVCMS-2 x SVSR-5 (16.32%). While considering physiological traits like chlorophyll content better parent heterosis ranged from 18.03% (SVCMS-1 x SVSR-4) to 85.19% (SVCMS-2 x SVSR-5) and standard heterosis ranged from -10.61% (SVCMS-1 x SVSR-2) to 30.65% (SVCMS-4 x SVSR-4). For leaf area standard heterosis ranged from -18.15% (SVCMS-1 x SVSR-1) to 12.94% (SVCMS-1 x SVSR-5). The high heterotic response in these hybrids for seed yield per plant resulted mainly due to substantial heterosis for head diameter, leaf area, chlorophyll content and seed volume weight.