Open Access

ARTICLE

Effects of Salt-Alkaline Stress on Carbohydrate Metabolism in Rice Seedlings

Xiwen Shao¹, Dongsheng Gai¹, Dapeng Gao¹, Yanqiu Geng^1,*, Liying Guo^1,2,*
1 Jilin Agricultural University, Changchun, 130118, China
2 Key Laboratory of Germplasm Innovation and Physiological Ecology of Grain Crops in Cold Region, Ministry of Education, Harbin, 150030, China
* Corresponding Authors: Yanqiu Geng. Email: ; Liying Guo. Email:
(This article belongs to this Special Issue: High-Yield Rice Physiology & Genetics)

Phyton-International Journal of Experimental Botany 2022, 91(4), 745-759. https://doi.org/10.32604/phyton.2022.018933

Received 25 August 2021; Accepted 02 November 2021; Issue published 09 December 2021

Abstract

The aim of this study was to investigate carbohydrate metabolism in rice seedlings subjected to salt-alkaline stress. Two relatively salt-alkaline tolerant (Changbai 9) and sensitive (Jinongda 138) rice cultivars, grown hydroponically, were subjected to salt-alkaline stress via 50 mM of salt-alkaline solution. The carbohydrate content and the activities of metabolism-related enzymes in the leaves and roots were investigated. The results showed that the contents of sucrose, fructose, and glucose in the leaves and roots increased under salt-alkaline stress. Starch content increased in the leaves but decreased in the roots under salt-alkaline stress. The activities of sucrose-phosphate synthase, sucrose synthase, amylase, and ADP-glucose pyrophosphorylase increased whereas the activities of neutral invertase and acid invertase decreased in the leaves under salt-alkaline stress. The activities of sucrose-phosphate synthase, sucrose synthase, amylase, neutral invertase, and acid invertase increased in the roots under salt-alkaline stress. In conclusion, salt-alkaline stress caused the accumulation of photosynthetic assimilates in the leaves and decreased assimilation export to the roots.

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Keywords

Rice; salt-alkaline stress; starch metabolism; sucrose metabolism

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