Evaluation of staygreen sunflower lines and their hybrids for yield under drought conditions

Abstract

The experimental material for the present study comprised of 28 inbred lines (including two checks) which were developed by mutation and hybridization among the lines from AICRP trials MARS, UAS, Dharwad and on the basis of SPAD readings and stay green nature, they were considered as drought tolerant lines. These lines were used for the present experiment and were evaluated under both normal and moisture stress condition in rain out shelter to study their root characteristics. Among 28 inbreds evaluated, eight inbred lines i.e. DSR-13, DSR-19, DSR-23, DSR-24, DSR-37, DSR-66, DSR-107 and DSR-132 were identified as drought tolerant nature which exhibited least reduction in their yield under moisture stress condition. Simultaneously hybridization programme was also initiated during summer 2018 using these 28 inbred lines as testers (males) and 5 CMS lines as female lines in Line × Tester fashion. Among 140 hybrids developed, only 40 F1 hybrid combinations were further analyzed for heterosis and combining ability studies along with four checks RHA 6D-1, RHA 95C-1, KBSH-53 and Cauvery Champ. Most of the hybrid combinations showed significant negative heterosis for flowering indicating earliness, and also all the combinations showed a positive heterosis for plant height indicating tallness dominant over dwarf checks. The combinations CMS 7-1-1 A × DSR-37 (624 kg/ha), CMS-853A × DSR-19 (624 kg/ha), and CMS-853A × DSR-23 (619 kg/ha) exhibited significant maximum heterosis for seed yield (kg ha−1) over the checks KBSH-53 (496.50 kg/ha) and Cauvery Champ (486.50 kg/ha) showing maximum seed yield per hectare.

Genetic Evaluation for Seed Yield and Its Component Traits in Sunflower (Helianthus Annuus L.) Using Line × Tester Approach

“…This indicates specific combinations of lines and testers influencing trait expression, highlighting the importance of evaluating specific hybrids rather than individual lines and testers. This aligns with previous research by Hilli and Immadi (2021), Bohra et al (2022), Memon et al (2015), Mehmood (2021), Ashraf et al (2015), and Shyam Sundar et al (2021),.…”

Forage Production in India: Bottlenecks and Opportunities by Opening up New Way with an Increase in Fodder Oats Demand: A Review

“…Short oats, or Avena brevis, are grown in South Europe as green fodder. Oats suits to a wide range of soil with good water holding capacity but high N content in soil is not a desirable condition as it may lead to lodging (Hilli and Immadi, 2022;Hilli, 2021;Hilli and Immadi, 2021). It grows best in cool and moist climates which is important during grain filling for high yield.…”

An Overview of Breeding Objectives to Improve the Economically Important Traits in Oat

“…Agricultural productivity can be reduced by 50 to 70 percent as a result of abiotic stress, which has a substantial influence on the growth and development of crop plants. 23,24,25 The release of greenhouse gases from diverse sources (global warming) is one of the factors assumed to be responsible for the steady increase in global average temperature. This alters the pattern of precipitation, which in turn leads to irregular drought or flood stress.…”