Genetic diversity of sugar beet under heat stress and deficit irrigation

Abstract

In the light of climate changes and global warming, as well as the rapid expansion in sugar beet (Beta vulgaris L.) cultivation in Egypt, the development of sugar beet varieties with improved tolerance to high temperature and deficit irrigation is of great importance. The objective of this study was to evaluate sugar beet genotypes under high temperatures and deficit irrigation conditions for further identification and selection of heat and drought tolerant genotypes. In the current study, a panel of 18 sugar beet breeding lines produced at the USDA-ARS-NWISRL, Kimberly, ID, and the commercial sugar beet cultivar Kawimera were evaluated for yield and quality under high temperature. Six promising lines in terms of yield and quality were further evaluated under both high temperature and deficit irrigation for two growing seasons. All lines performed differently under deficit irrigation, indicating a high degree of genetic variability in the evaluated lines. Additionally, yield traits showed negative effect due to deficit irrigation. A significant positive correlation was observed between stress tolerance index (STI), and average root and sugar yields under stressed and non-stressed conditions. A linear relationship between STI and average root and sugar yields indicates that STI is a reliable stress index to select high yielding genotypes under both optimum-and deficit-irrigation conditions. USKPS25 and USC944-6-68 breeding lines are most likely adapted to deficit irrigation and high temperature and suitable to be utilized in the proposed sugar beet breeding programs in Egypt.

Evaluation of chemical composition of roots of three sugar beets varieties growing under different water deficit and harvesting dates in Upper Egypt

“…From results it could be seen that level of 70% WR recorded the best value of α-amino N% in the first season but the best value of α-amino N% in the second season was with 100% WR, while the highest value of sodium % was recorded 4.388% compared with irrigation 70%WR in the first season only and 3.713% and compared with irrigation 85% WR in the second season only and the highest values of K % was recorded 5.104% compared with irrigation 70 WR in the first season only and 4.958% and compared with irrigation 100 WR in the second season only .These data are in partial agreement with those obtained by this is probably due to the various counteracting effects of deficit irrigation on ion uptake. [26][27][28]…”

“…Similarly, extractable sugar % of 85% WR and 70% WR irrigation treatments increased by 1.4% and 0.9 % in 2018/19 season and by 1.1 % and 0.7 % in the 2019/20 season as compared by 100% WR, respectively. 34,35,28…”

“…Also, the same treatments increased extractability sugar%.1.4 and 0.9% in 2018/19 season and 1.1% and 0.7% in 2019/20 season compared to 100% WR treatment, respectively. 28…”

SNP Alleles Associated With Low Bolting Tendency in Sugar Beet

“…Sugar beet is an important crop in the temperate areas providing about 30% of total sugar (OECD-FAO, 2020 ). In the global change scenario, an emerging priority for sugar beet breeding is to increase the yield in the face of recurrent and adverse environmental conditions, such as cold, thermal, water, and nutritional stresses (Hoffmann and Kenter, 2018 ; Abou-Elwafa et al, 2020 ).…”

Recycling of beet sugar byproducts and wastes enhances sugar beet productivity and salt redistribution in saline soils

“…The increasing production of sugar beet (Beta vulgaris, L.) in the tropical and subtropical regions is an important part of the beet sugar industry. Its salt tolerance is the main advantage of sugar beet and makes it a promising sugar crop in these regions (Kaffka &Hembree 2004).It has e cient growth, high sugar production, and completes its lifecycle in a short growing season in the newly reclaimed soils dominating these regions which are mostly characterized as saline soils (Abo-Elwafa et al 2013, Abo-Elwafa et al 2006, Abou-Elwafa et al 2020, Balakrishnan &Selvakumar 2009. In Egypt, salt affected soils represent 9.1 % of the total area and 30 % of the cultivated area (FAO 2005).…”