Abstract:

The study aimed to explore the differences of yield and endogenous hormone content of different sweet potato varieties under salinized soil conditions, in order to screen suitable varieties for planting in salinized soil and parent materials for breeding new salt tolerant varieties. 20 locally selected sweet potato varieties (lines) in Fujian Province were used as materials for adaptive planting experiments in salinized soil. After 60 days of planting, the endogenous hormone contents of sweet potato leaves and tubers were measured, and the tuber yield was measured after 140 days. The results showed that: (1) the varieties (lines) with sweet potato tuber yield of more than 30000 kg/hm² in salinized soil included ‘Longshu 10’, ‘Fushu 604’, ‘R132’, ‘R106’, ‘Jinshan 57’, ‘Jinshu 20’, ‘Longshu 116’ and ‘funingzi 5’, which belonged to the high-yield type in salinized soil. The tuber yield decreased by less than 10% compared with the control, and the salt tolerance index was higher than 1.1, belonging to strong salt tolerant varieties (lines). (2) Correlation analysis showed that the tuber yield of different sweet potato varieties (lines) planted in salinized soil was significantly positively correlated with IAA, GA3 and ZR contents in leaves, and significantly negatively correlated with ABA content in leaves. It was extremely significantly positively correlated with IAA, GA3 and ZR content in tubers, and extremely significantly negatively correlated with ABA content in tubers. In conclusion, sweet potato varieties(lines) such as ‘Longshu 10’, ‘Fushu 604’, ‘R132’, ‘R106’, ‘Jinshan 57’, ‘Jinshu 20’, ‘Longshu 116’, and ‘Funingzi 5’ are suitable for planting in salinized soil and be used as parent materials for breeding new salt tolerant sweet potato varieties.

Key words: salinized soil, sweet potato, yield, endogenous hormone, IAA, GA3, ZR, ABA