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Abstract
The potato steroidal glycoalkaloids (SGAs) are secondary metabolites,two major SGA in cultivated potato (Solanum tuberosum) are α-chaconine and α-solanine,and their total content in tubers should not exceed the safety limit of 20 mg 100 g-1 FW,otherwise it can be toxic to humans. Accumulation of SGAs in potato tubers is influenced by many factors including the key environmental factors,temperature and light. In order to reduce the content of SGAs and research the accumulation mechanism of SGAs in potato tubers,in the present study we attempted to compare the contents of SGAs,second messengers—calmodulin and the G protein in potato tubers,treated with the treatments of red light,blue light,white light and darkness under the same tem-perature (15℃ ). The results indicated that red light significantly (P 0.01) increased the average content of SGAs in potato tubers,with 26.02%,55.50%,and 100.79% higher than that treated with blue light,white light and darkness,respectively. It was confirmed that light with different wavelengths has different effects on accumulation of SGAs in potato tubers. Among factors influencing the accumulation of SGAs in potato tubers,the red light took the first place and the blue light took the second place. Meanwhile,the content of second messengers—the G protein in potato tubers treated with red light was 0.95%,2.01%,and 3.86% higher than that treated with blue light,white light and darkness,respectively. And the content of calmodulin in potato tubers treated with red light was 7.94%,37.41%,and 87.24% higher than that treated with blue light,white light and darkness,respectively. It was inferred that the red light is the signal molecule for SGAs accumulation,which stimulates the acceptor (PHYB) of red light and participate in accumulation of SGAs in potato tubers,together with the second messenger G protein,calmodulin,and so on.
Published Version
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