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Article

Threshold Tolerance of New Genotypes of Pennisetum glaucum (L.) R. Br. to Salinity and Drought

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International Platform for Dryland Research and Education (IPDRE), Tottori University, Tottori 680-8550, Japan
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International Center for Biosaline Agriculture for Central Asia and Caucasus (ICBA-CAC), 6A, Osyo Street, Tashkent 100000, Uzbekistan
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K.A. Timiryazev Institute of Plant Physiology, Russian Academy of Science, Botanicheskaya Street 35, Moscow 127276, Russia
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Water Resources Research Center, Kyoto University, Gokasho, Kyoto 611-0011, Japan
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International Maize and Wheat Improvement Center for Central Asia and the Caucasus, 51, Zhandosova Street, Almaty 050035, Kazakhstan
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International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Hyderabad, Patancheru, Telangana 502 324, India
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Arid Land Research Center, Tottori University, Tottori 680-8550, Japan
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Nukus Branch of Uzbek Corn Research and Experimental Station, 25, Kegeli Street, Nukus 230100, Uzbekistan
*
Author to whom correspondence should be addressed.
Agronomy 2018, 8(10), 230; https://doi.org/10.3390/agronomy8100230
Received: 31 August 2018 / Revised: 15 October 2018 / Accepted: 16 October 2018 / Published: 18 October 2018
(This article belongs to the Section Crop Breeding and Genetics)
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. View Full-Text
Keywords: salinity stress; drought; Pennisetum glaucum germplasm; photosynthesis; non-conventional crops salinity stress; drought; Pennisetum glaucum germplasm; photosynthesis; non-conventional crops
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MDPI and ACS Style

Toderich, K.; Shuyskaya, E.; Rakhmankulova, Z.; Bukarev, R.; Khujanazarov, T.; Zhapaev, R.; Ismail, S.; Gupta, S.K.; Yamanaka, N.; Boboev, F. Threshold Tolerance of New Genotypes of Pennisetum glaucum (L.) R. Br. to Salinity and Drought. Agronomy 2018, 8, 230. https://doi.org/10.3390/agronomy8100230

AMA Style

Toderich K, Shuyskaya E, Rakhmankulova Z, Bukarev R, Khujanazarov T, Zhapaev R, Ismail S, Gupta SK, Yamanaka N, Boboev F. Threshold Tolerance of New Genotypes of Pennisetum glaucum (L.) R. Br. to Salinity and Drought. Agronomy. 2018; 8(10):230. https://doi.org/10.3390/agronomy8100230

Chicago/Turabian Style

Toderich, Kristina, Elena Shuyskaya, Zulfira Rakhmankulova, Roman Bukarev, Temur Khujanazarov, Rauan Zhapaev, Shoaib Ismail, Shashi K. Gupta, Norikazu Yamanaka, and Fazyl Boboev. 2018. "Threshold Tolerance of New Genotypes of Pennisetum glaucum (L.) R. Br. to Salinity and Drought" Agronomy 8, no. 10: 230. https://doi.org/10.3390/agronomy8100230

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