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Exogenous jasmonic acid and humic acid increased salinity tolerance of sorghum.

Authors :
Ali, Adam Yousif Adam
Ibrahim, Muhi Eldeen Hussien
Zhou, Guisheng
Nimir, Nimir Eltyb Ahmed
Jiao, Xiurong
Zhu, Guanglong
Elsiddig, Aboagla Mohammed Ibrahim
Suliman, Mohamed Suliman Eltyed
Elradi, Safiya Babiker Mustafa
Yue, Wang
Source :
Agronomy Journal; Mar/Apr2020, Vol. 112 Issue 2, p871-884, 14p
Publication Year :
2020

Abstract

Salinity limits germination and plant growth and development in 45 million ha worldwide. Techniques to overcome this problem are needed. This project investigated the effects of jasmonic acid (JA) (0, 5, and 10 mM JA) and humic acid (HA) (0, 3, and 6 g HA kg−1 soil) on growth and physiological parameters of forage sorghum (Sorghum bicolor L. Moench) under different NaCl salinity levels (0, 100, and 200 mM NaCl, with an equivalent electrical conductivity (EC) of 0.12 dSm−1 as control treatment, 3.22, and 5.78 dSm−1, respectively). NaCl salinity reduced emergence percentage, emergence rate, salt tolerance index and seedling vigor index, all seedling growth parameters, ascorbate peroxidase (APX) activity, chlorophyll a, b and total chlorophyll content. Proline content and soluble protein content were increased with salinity. At the 200 mM salinity level, seeds treated with 10 mM JA had a positive effect on emergence percentage, emergence rate, shoot length, total fresh weight, salt tolerance index, seedling vigor index, chlorophyll a and total chlorophyll content. At 200 mM NaCl salinity level, seeds treated with 6 g HA kg−1 soil had increased root length, total dry weight, salt tolerance index, seedling vigor index, shoot length, protein content, APX, chlorophyll b, and total chlorophyll in seedlings. The application of 5 mM JA combined with 6 g HA kg−1 soil was most effective in minimizing salinity stress. Our study suggested that the appropriate combined application of HA and JA could efficiently protect early seedlings from salt stress damage and alleviate abiotic stress. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00021962
Volume :
112
Issue :
2
Database :
Supplemental Index
Journal :
Agronomy Journal
Publication Type :
Academic Journal
Accession number :
142832642
Full Text :
https://doi.org/10.1002/agj2.20072