Combining Ability of Sunflower Inbred Lines under Drought Stress

Abstract

Sixteen sunflower hybrids obtained by crossing between four CMS and four restorer lines as tester were evaluated for combining abilities of agronomic traits under optimum and water limited conditions using line×tester mating design. There was considerable variability among genotypes for the traits in both normal and stressed experiments. The results indicated that the lines AGK344 and AGK148 with suitable GCA for early maturity and plant height respectively and AGK52 for oil content and seed and oil yield were desirable combiner under both optimum and stressed condition. In other hand, AGK344 expressed a significant GCA for plant height in suitable direction under stressed condition. Among the testers RGK26 and RGK56 had suitable GCA for days to maturity under both conditions. RGK56 and RGK26 were appropriate combiner for oil content under optimum and water stressed conditions respectively the later had desired GCA for seed and oil yield under water stressed condition too. According to the results, there was differentiate GCA of testers for days to flowering, seed weight and oil content in normal and stressed condition. Differential expressions of GCA in parent inbred lines indicated that selection of restorer lines for the agronomic traits would be more efficient than the selection of CMS lines. It is concluded that heritability of a trait determines the kind of SCA in response to different environments and the SCA effects are more stable for traits with higher heritability.

Genetic Analysis of Morpho-Physiological Characteristics of Sunflower Under Stress and Non-Stress Drought Conditions

“…RGHK50 and RGHK25 testers also had the highest positive and significant general combining ability in grain yield and oil yield under normal and stress conditions (Table 5). Ghaffari & Shariati (2018) also achieved similar results.…”

“…Combining ability of inbred lines could be estimated with various methods, such as top cross; line x tester analysis, in which several testers are used (Ghaffari & Shariati, 2018). Jocić, Miladinović, & Kaya (2015) analyzed four male sterile lines and 10 testers and found additive gene effects for seed yield.…”

Korelasi Dan Sidik Lintas Pada Hasil Dan Komponen Hasil Bunga Matahari (Helianthus Annuus L.)

“…(2013) yang menyatakan tinggi tanaman, diameter kepala bunga, dan jumlah daun per tanaman berkorelasi positif dengan hasil. Menurut Ghaffari et al (2012), tinggi tanaman merupakan karakter penting yang menentukan hasil baik dalam kondisi normal maupun cekaman kekeringan. Daun adalah media pembentukan fotosintat pada tanaman.…”

EVALUATION OF MALE INBRED LINES OF SUNFLOWER (Helianthus annuus L.) FOR RESISTANCE TO DROUGHT VIA CHLOROPHYLL FLUORESCENCE

“…Thus, yield and seed quality decrease due to biotic and abiotic stresses. Abiotic stresses including drought, high temperatures, cold, salinity, deficiency and toxicity of plant nutrients are mainly responsible for yield losses on the crop plants in the world (Awais et al, 2015;Ghaffari et al, 2012;Gül and Kara, 2015;Güney et al, 2012;Shehzad and Maqsood, 2015;Yıldırım et al, 2010). Drought together with high temperature are thought to be the most important abiotic stresses in arable lands because of global warming (Toker 2009 and2014;Sezener et al 2015).…”

“…It is cultivated widely in drylands and rainfed areas. Drought stress is common factor affecting adversely sunflower plants growth resulting in seed and oil yield and quality losses (Karadoğan et al, 2009;Ghaffari et al, 2012;Kaya, 2014;Kaya et al, 2016). Although sunflower is thought to be more tolerant/resistant (Howell et al, 2015), especially some vegetation stages such as germination, flowering and milky seed are known as the most critical stages for experiencing water stress.…”