Keywords

Osmotic Stress, Wheat, Nucleosome (Dnp), Bound Polyamines

Abstract

The noncovalently conjugated polyamines (NCC-PAs) and covalently bound polyamines (CC) on the deoxyribonucleic acid-protein (DNP) in the roots of wheat seedlings under osmotic stress were detected. -PAs) content. The NCC-Spm (spermine) content of both varieties increased due to osmotic stress, and the increase in Yumai 18 with strong drought resistance was significantly greater than that of Yangmai 9 with weak drought resistance; The NCC-Spd (spermidine) content increased significantly due to stress, while the NCC-Spd change in Yangmai 9 was not obvious; NCC-Put (putrescine) was not detected in the two varieties. Exogenous Spm treatment significantly promoted The increase in NCC-Spm and NCC-Spd content on the ribosomes of Yangmai No. 9 under osmotic stress also improved the resistance of Yangmai No. 9 seedlings to osmotic stress; methylglyoxal-bis(guaninehydrazone) ( That is, MGBG (an inhibitor of the biosynthesis of Spd and Spm) has the opposite effect when treating Yumai 18. The two varieties of wheat seedlings have covalently bound putrescine (covalentlyconjugated, CC-Put) and CC- on the root ribosomes under osmotic stress. Spd levels increased, and the increase in Yumai 18 with strong drought resistance was significantly greater than that in Yangmai 9 with weak drought resistance. Phenanthroline (i.e. o-Phen, inhibitor of CC-PAs synthetase and transglutaminase (TGase) ) treatment significantly inhibited the increase of CC-PAs on the ribosomes in the roots of Yumai 18 wheat seedlings under osmotic stress, and significantly reduced the resistance of its seedlings. These results show that: NCC-Spm on the ribosomes in the roots of wheat seedlings under osmotic stress The increase in the levels of NCC-Spd and CC-Put and CC-Spd is beneficial to enhancing the ability of wheat seedlings to adapt to osmotic stress.

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Original research done by Liu Huaipan, Yu Bingjun, Ji Xiu’e, Liu Youliang

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