Effect of Waterdeficit on Seed Yield and Prolinecontent in Some Faba Bean Genotypes

Abstract

Drought stress is one of the most serious problems for agriculture production and sustainability. This study was carried out to investigate seed yield and its components in addition to estimate free proline content in leaves of nine faba bean genotypes with different types grown under three water regimes (well-watered, mild and severe drought).A field experiment was laid out in split plot with three replications during two growing seasons, 2013/14 and 2014/15. The results indicated that drought had pronounce negative effects on yield and its components for all faba bean yield characters, while the effect was positive with leaves proline content. Hassawi 2 out yielded all genotypes under all water treatments and was followed by Giza 843 and ILB 1814 under well irrigation and by Giza Blanka and Giza 843 under high drought stress. Furthermore Hassawi 2 and Nubaria 1 showed higher drought tolerance efficiency (42.3 and 39.5), less drought stress susceptibility index (0.6) and minimum reduction in seed yield 58.3 and 60.4%, respectively. Proline content ranged from 46.3μg/g for Gazira 2 to 69.7 for ILB 1814 under well-watered and from 89.8 for Kamline to 264.0 for Gazira 1 under severe drought. Proline content and seed yield/plant negatively correlated (r =-0.65**) over all treatments and was insignificant under both well-watered (r= 0.62) and high drought stress (r= 0.43). This indicated that proline content was drought stress sensor and could not use as selection parameter for drought tolerant genotype.

Effect of Water Regimes and Polyvinyl Alcohol on Faba Bean Yield, Chemical Composition and Water Use Efficiency

“…The differences between the three (ASMD) treatments on WUE were significant in both seasons. The obtained results are in full agreement with those reported by Ekebafe et al(2011), Chandrika et al (2014 and El-Harty (2016).…”

“…El-Harty (2015) showed that drought had pronounced negative effects on yield and its components for all faba bean yield characters. El-Harty, (2016) identified a decrease in Faba bean traits with water deficit except WUE which was highest under moderate stress.…”

Combining Ability and Selecting Elite Faba Bean Genotypes Under Drought Stress Conditions Using Tolerance Indices

“…The importance of additive genetic action in controlling these traits was previously mentioned by Abdelmula (2006), EL-Harty (2006), Ibrahim (2010), , Farag and Afiah (2012), El-Banna et al, (2014), EL-Harty (2016), andBishnoi et al, (2018). On the other hand, the non-additive genetic variance was previously reported to be the most prevalent for seed yield plant -1 by Obiadalla et al, (2013), El-Harty et al, (2016 and El-Abssi et al (2019) No. of branches plant -1 by Sattar et al, (2012); and Ashrei et al (2014) ; For 100-seed weight by Abd-Elrahman et al, (2012) and Farag and Afiah (2012).…”