Assessment of drought tolerance indices in faba bean genotypes under different irrigation regimes

Abstract

Drought stress has devastating impacts on faba bean production, particularly with the current abrupt climate changes in arid environments. Hence, it is essential to identify drought-tolerant genotypes. The present study aimed at assessing six faba bean genotypes under three irrigation levels during two winter successive growing seasons (2018/2019 and 2019/2020). The applied irrigation levels were well-watered (every 4 days (D1), moderate drought every 8 days (D2), and severe drought 12 days (D3)) regimes. The analysis of variance exhibited highly significant differences among genotypes, irrigation treatments, and their interactions for all studied traits, except the number of pods plant−1 in the first season. Yield traits of all assessed genotypes decreased significantly with increasing drought stress. Otherwise, proline content (Pro) increased significantly with increasing drought stress. The genotypes Giza.843, Nubaria.2, and Nubaria.3 recorded the highest values of plant height, number of branches/plant, pods/plant, pods weight/plant, 100 seed weight, seed yield/plant, and seed yield/kg under drought stress. Similarly, the highest Pro was displayed by Giza.843 and Nubaria.3 under drought stress in both seasons. Furthermore, Giza.843, Nubaria.2, and Nubaria.3 genotypes had the highest values for most tolerant indices. Accordingly, these genotypes could be exploited in developing drought-tolerant and high-yielding faba bean genotypes in arid environments through breeding programs.

Evaluation of Drought Tolerance in USDA Tomato Germplasm at Seedling Stage

“…Several previous studies reported decreased chlorophyll content for plants exposed to extremely dry conditions, depending on the period of drought [59]. Leaf chlorophyll content is shown to increase during an early stage of water stress and decrease gradually with increasing periods of drought [60]. The results of this study showed that leaf chlorophyll content was greatly reduced in drought-stressed tomato plants, indicating that water stress negatively affected chlorophyll synthesis, as illustrated in many previous studies.…”

Response of Growth, Productivity and Quality For Some Faba Bean (Vicia faba L.) Cultivars to Different Irrigation Regimes

“…In this concern, many researchers found that exposing faba bean plants to inadequate moisture caused a reduction in RWC % and total chl. (Abdel Samie et al, 2021;Abdelhaleim et al, 2022) and TWC% (El-Gabry & Morsi, 2019).…”

“…increasing irrigation intervals (El -Metwally et al, 2007), skipping irrigation number (Ibrahim, 2011) and decreasing either water applied (Fouda et al, 2022) or number of irrigations (Eid et al, 2008). Other investigators found that exposing faba bean plants to any water drought stress caused a significant damaging for plant growth (Oukaltouma et al, 2021;Abdelhaleim et al, 2022), seed yield/ plant and its components (El-Emshaty et al, 2021;Yousry et al, 2021) and seed yield/ fed (Abdel-Ghany et al, 2016;EL-Mansoury & Saleh, 2017) but led to an increase in protein % (Mekkei, 2014;Megawer et al, 2017) and water use efficiency (Abdel Samie et al, 2021;Noreldin & Abd-Alla, 2022). Moreover, Fakkar et al (2016), Tawfik et al (2018) and El-Gabry & Morsi (2019) found that the faba bean cultivars differed in their behaviour and seed and water productivity under various drought stress conditions.…”

Diversity of harmful and beneficial insects on Faba bean, Vicia faba L. (Fabales: Fabaceae) crop in Assiut Governorate, Northern Upper Egypt

“…Faba bean, Vicia faba L. (Family: Fabaceae) is one of the oldest economic legume crops globally (Elsebaie et al 2022) which is believed to be originated in the Near East (Merga et al 2019). Worldwide, the most producing countries of this crop are China, Ethiopia, France, Egypt, and Australia (Abdelhaleim et al 2022). In Egypt, V. faba is considered the most popular nutritive crop and stable food in the Egyptian diet (El-Metwally et al 2017).…”