Plant Growth Regulators Affect Germination and Main Carbon-Nitrogen Metabolites of Potato Tubers
American Journal of Agriculture and Forestry
Volume 7, Issue 1, January 2019, Pages: 10-16
Received: Nov. 6, 2018;
Accepted: Dec. 29, 2018;
Published: Jan. 30, 2019
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Zhong Lei, Key Laboratory of Crop Ecophysiology and Farming System in Southwest of China, Ministry of Agriculture/College of Agronomy, Sichuan Agricultural University, Chengdu, China
Wang Liangjun, Agricultural Extension Station of Dongpo District of Meishan City in Sichuan, Meishan, China
Yuan Jichao, Key Laboratory of Crop Ecophysiology and Farming System in Southwest of China, Ministry of Agriculture/College of Agronomy, Sichuan Agricultural University, Chengdu, China
Zheng Shunlin, Key Laboratory of Crop Ecophysiology and Farming System in Southwest of China, Ministry of Agriculture/College of Agronomy, Sichuan Agricultural University, Chengdu, China; Ministry of Agriculture Key Laboratory of Tuber Crop Genetics and Breeding, Chengdu Jiusen Agricultural, Chengdu, China
Hu Jianjun, Crop Institute, Sichuan Academy of Agricultural Sciences, Chengdu, China
Assessing the effects of different growth regulators on sprout growth and tuber carbon-nitrogen metabolism during the storage of potato tubers is helpful to understand the physiological changes of dormancy in potatoes. In this study, a major potato cultivar ‘Chuanyu-117’ of Southwestern China was used as the experimental material. The tubers were immersed in sprouting inhibitors chlorpropham (CIPC), abscisic acid (ABA), and gibberellin A3 (GA3) to study sprout growth and changes in the carbon-nitrogen metabolism during tuber storage. The results showed that GA3 treatment shortened the dormancy intensity and amplitude by 17 days and 11 days, respectively, and that the sprouts grew faster after germination. Compared to the control treatment, ABA prolonged dormancy and increased its intensity by 6 days but shortened the amplitude by 11 days. After dormancy, the sprouts grew rapidly and uniformly. The CIPC treatment had a more significant dormancy prolonging effect. The stems germinated 70 days post treatment, and the germination period was extended by at least 40 days compared with the control. Tubers treated with different growth regulators showed similar carbon-nitrogen metabolism during the storage period. However, the rate of variation was significantly different. After 12 weeks, the starch content of tubers treated with GA3, ABA, and CIPC decreased by 13.36%, 11.30%, and 5.93%, respectively, while soluble sugar content decreased by 48.3%, 58.9%, and 56.1%, respectively. Soluble protein and crude protein content in the treated tubers first increased and then decreased. Soluble protein content in the tubers treated with GA3, ABA, and CIPC increased during storage but decreased in the later period. Crude protein content also increased the first time, and then decreased in the later period. Changes in the carbon-nitrogen ratio of tubers in different treatments during storage were also different. The carbon-nitrogen ratio of tubers treated with sprouting promotors was high, while that of the tubers treated with sprouting inhibitors was low and showed a gradual decreasing trend.
Plant Growth Regulators Affect Germination and Main Carbon-Nitrogen Metabolites of Potato Tubers, American Journal of Agriculture and Forestry.
Vol. 7, No. 1,
2019, pp. 10-16.
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