Drought deteriorated the nutritional quality of cottonseed by altering fatty acids and amino acids compositions in cultivars with contrasting drought sensitivity
2022
Li, Yuxia | Zou, Jie | Zhu, Honghai | He, Jiaqi | Setter, Tim L. | Wang, Youhua | Meng, Yali | Chen, Binglin | Zhao, Wenqing | Wang, Shanshan | Hu, Wei | Zhou, Zhiguo
Cottonseed is an excellent source of vegetable oil and plant protein for food industry due to its natural ability of high oil and protein content. This study is designed to examine the influence of drought stress on the yield and quality of cottonseed kernels. Cottonseed yield and kernel yield per plant, as well as oil yield and protein yield, were significantly decreased under drought. The oil concentration (%/dry weight) decreased, but protein concentration (%/dry weight) increased significantly in response to drought. Total unsaturated fatty acids (UFA) and total essential amino acids (EAA) concentrations decreased notably under severe drought. Moreover, the decrease of polyunsaturated to saturated fatty acids ratio (PUFA/SFA), health-promoting index (HPI), unsaturation index (UI), and the increased atherogenicity index (AI), indicated the lower unsaturation of fatty acids which induced an unhealthy oil under drought stress. Otherwise, the variations of essential amino acids index (EAAI), nutritional value (NI), score ratio coefficient of amino acid (SRC) and biological value (BV) forecasted a diminished amino acids quality under drought stress. Results suggested that drought stress decreased cottonseed yield and deteriorated cottonseed nutritional values. The present research is a leading report describing the influences of drought on the nutritional quality indices in cottonseed. In addition, this study contributes to understanding the response of cottonseed nutritional value to soil moisture stress.
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