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Changes in low-molecular weight heat shock protein 22 of mitochondria during high-temperature accelerated ageing of Beta vulgaris L. seeds

Song Songquan, Fredlund K M, Moller I M

School of Life Sciences,Zhongshan University.Guangzhou 510275,Guangdong；Sweden

Abstract

High-temperature accelerated ageing (at 30deg C and 100% RH) of sugar beet (Beta vulgaris L. cv. Loke) seeds resulted in radual loss of dry weight, viability and vigour of seeds, and lowering of mitochondrial respiratory rate and activities of cytochrome c oxidase and malate dehydrogenase in mitochondria. Protein composition in mitochondria showed marked changes with ageing of seeds; low-molecular weight heat shock protein (LMW HSP) 22 increased from 0 d to 30 d of ageing, and then decreased from 30 d to 90 d of ageing. It was found that changes in mitochondria activity and LMW HSP 22 content were closely correlated with seed vigour during accelerated ageing of sugar beet seeds.

Key words: Ageing;Beta vulgaris;Cyt .c oxidase;MDH;LMW HSP 22;Respiratory rate;Seed vigour

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Citing This Article：

Song Songquan, Fredlund K M, Moller I M. Changes in low-molecular weight heat shock protein 22 of mitochondria during high-temperature accelerated ageing of Beta vulgaris L. seeds. Acta Physiol Sin 2001; 53 (1): (in Chinese with English abstract).