Photosynthetica 2019, 57(3):890-896 | DOI: 10.32615/ps.2019.106

Physiological characterization and thylakoid ultrastructure analysis in super high-yield hybrid rice leaves under drought stress

Y.W. WANG†, D.X. JIANG†, J.J. HOU, G.X. CHEN
Jiangsu Key Laboratory of Biodiversity and Biotechnology, Life Sciences College, Nanjing Normal University, 210023 Nanjing, China

Rice serves for more than a third of the world's population. However, drought stress (DS) affects its growth and yield. In order to understand plant drought adaptability, we explored the physiological and thylakoid ultrastructural alteration in super high-yield hybrid rice Liangyoupeijiu (LYPJ) under DS. Results showed that DS altered the thylakoid ultrastructure; twisted and fractured stroma thylakoids and more starch granules in chloroplast of LYPJ were present. Also, DS lowered chlorophyll and carotenoid contents in LYPJ after 7 d. DS reduced the proportion of unsaturated fatty acids in thylakoid membranes and increased the content of linoleic and abscisic acids (ABA) and osmotic substances such as calcium and potassium in LYPJ. Based on these results, we concluded that although DS severely affected normal growth, plants employed various strategies, such as changing their membrane lipid fluidity, increasing endogenous ABA and osmotic substance contents and stabilizing the grana thylakoids, in order to adapt to drought stress.

Keywords: abiotic stress; membrane lipid fluidity; osmotic adjustment; phytohormone.

Received: March 14, 2019; Accepted: June 26, 2019; Prepublished online: July 18, 2019; Published: July 23, 2019Show citation

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WANG, Y.W., JIANG, D.X., & CHEN, J.J.H.G.X. (2019). Physiological characterization and thylakoid ultrastructure analysis in super high-yield hybrid rice leaves under drought stress. Photosynthetica, 57(3), 890-896. doi: 10.32615/ps.2019.106.
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