agrba8_230.pdf 813 KB
Toderich, Kristina International Platform for Dryland Research and Education (IPDRE), Tottori University / International Center for Biosaline Agriculture for Central Asia and Caucasus (ICBA-CAC) Researchers DB
Shuyskaya, Elena K.A. Timiryazev Institute of Plant Physiology, Russian Academy of Science
Rakhmankulova, Zulfira K.A. Timiryazev Institute of Plant Physiology, Russian Academy of Science
Bukarev, Roman K.A. Timiryazev Institute of Plant Physiology, Russian Academy of Science
Khujanazarov, Temur Water Resources Research Center, Kyoto University
Zhapaev, Rauan International Maize and Wheat Improvement Center for Central Asia and the Caucasus
Ismail, Shoaib International Center for Biosaline Agriculture for Central Asia and Caucasus (ICBA-CAC)
Gupta, Shashi K. International Crops Research Institute for the Semi-Arid Tropics (ICRISAT)
Boboev, Fazyl Nukus Branch of Uzbek Corn Research and Experimental Station
Pennisetum glaucum germplasm
With continued population growth, increasing staple crop production is necessary. However, in dryland areas, this is negatively affected by various abiotic stresses, such as drought and salinity. The field screening of 10 improved genetic lines of pear millet originating from African dryland areas was conducted based on a set of agrobiological traits (i.e., germination rate, plant density, plant maturity rate, forage, and grain yields) in order to understand plant growth and its yield potential responses under saline environments. Our findings demonstrated that genotype had a significant impact on the accumulation of green biomass (64.4% based on two-way ANOVA), while salinity caused reduction in grain yield value. HHVBC Tall and IP 19586 were selected as the best-performing and high-yielding genotypes. HHVBC Tall is a dual purpose (i.e., forage and grain) line which produced high grain yields on marginal lands, with soil salinization up to electrical conductivity (EC) 6–8 dS m−1 (approximately 60–80 mM NaCl). Meanwhile, IP 19586, grown under similar conditions, showed a rapid accumulation of green biomass with a significant decrease in grain yield. Both lines were tolerant to drought and sensitive to high salinity (above 200 mM NaCl). The threshold salinity of HHVBC Tall calculated at the seedling stage was lower than that of IP 19586. Seedling viability of these lines was affected by oxidative stress and membrane peroxidation, and they had decreased chlorophyll and carotenoid biosynthesis. This study demonstrated that ionic stress is more detrimental for the accumulation of green and dry biomass, in combination with increasing the proline and malonic dialdehyde (MDA) contents of both best-performing pearl millet lines, as compared with osmotic stress.
(C) 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Toderich Kristina, Shuyskaya Elena, Rakhmankulova Zulfira, et al. Threshold Tolerance of New Genotypes of Pennisetum glaucum (L.) R. Br. to Salinity and Drought. AGRONOMY-BASEL. 2018. 8(10). doi:10.3390/agronomy8100230
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