Polyamines conjugated to deoxyribonucleic acid-protein in cell nucleus from filling grain embryos were involved in tolerance of wheat to drought

Deoxyribonucleic acid-protein (DNAP) of the cell nucleus was purified from developing wheat ( Triticum aestivum L.) embryo cells under drought stress, with two cultivars differing in drought tolerance as experimental materials – Longmai No. 079 (drought-tolerant) and Wanmai No. 52 (drought-sensitive). Levels of polyamines (PAs) non-covalently conjugated to the DNA and covalently conjugated to the proteins of DNAP were detected. After soil drought treatment for 10 days, in drought-tolerant Longmai No. 079, the increases in the levels of spermine and spermidine non-covalently conjugated to DNA of DNAP were more statistically significant ( P