Effect of 1-naphthaleneacetic acid on the seed, protein, oil, and fatty acids of Egyptian cotton

The effects of 1‐naphthaleneacetic acid (NAA) applied at various levels and times on yield, seed index, protein and oil content and fatty acid compositions of cotton plants seeds were studied. NAA increased the seed yield/plant and the seed, protein, and oil yields/ha compared to the control. A level of 20 ppm proved best for yield. Most NAA treatments significantly increased the seed index, but only slight increases in seed protein content were recorded. Increases in the amount of seed oil was moderate, with fluctuation that was due to treatment. NAA generally caused decreases in saturated fatty acids that were associated with increases in unsaturated fatty acids. One treatment proved to be more effective than multiple treatments. Palmitic acid and linoleic acid were the most abundant saturated and unsaturated fatty acids, respectively.