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

Toderich, K and Shuyskaya, E and Rakhmankulova, Z and Bukarev, R and Khujanazarov, T and Zhapaev, R and Ismail, S and Gupta, S K and Yamanaka, N and Boboev, F (2018) Threshold Tolerance of New Genotypes of Pennisetum glaucum (L.) R. Br. to Salinity and Drought. Agronomy, 8 (10) (230). pp. 1-13. ISSN 2073-4395

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Abstract

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.

Item Type: Article
Divisions: Research Program : Asia
CRP: UNSPECIFIED
Uncontrolled Keywords: salinity stress; drought; Pennisetum glaucum germplasm; photosynthesis; non-conventional crops
Subjects: Others > Abiotic Stress
Others > Plant Genetics
Mandate crops > Millets > Pearl Millet
Others > Crop Physiology
Others > Drought
Others > Genetics and Genomics
Depositing User: Mr Ramesh K
Date Deposited: 22 Oct 2018 07:52
Last Modified: 22 Oct 2018 07:52
URI: http://oar.icrisat.org/id/eprint/10899
Official URL: http://dx.doi.org/10.3390/agronomy8100230
Projects: UNSPECIFIED
Funders: UNSPECIFIED
Acknowledgement: Funding: Parts of this study were conducted within the project NAS Sub-Grant Award Number: AID-OAA-A-11-00012 “Use of Non-Conventional AgriculturalWater Resources to StrengthenWater and Food Security in Transboundary Watersheds of the Amu Darya River Basin (UNCAWR)”, which was financially supported by the United States Agency for International Development, and within the framework of the National State Program “Scientific-based knowledge for sustainable use of water resources and promotion of technologies of improvement productivity of agricultural landscapes”, which was financially supported by the Ministry of Agriculture of the Republic of Kazakhstan. Acknowledgments: We thank Lesley Benyon, from Edanz Group (www.edanzediting.com/ac) for editing a draft of this manuscript.
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