Abstract:

【Objective】 The relationship between potato growth, tuber formation and endogenous GA3,ABA and JA was studied with an aim to provide a basis for the balanced production and variety introduction of potato in Yunnan. 【Method】 Four main potato cultivars used in Yunnan, including Atlantic, Cooperation 88, Mira and Zhongdianhong, were planted under 6 different temperature and photoperiod treatments (15℃8 h, 15℃12 h , 15℃16 h , 25℃8 h, 25℃12 h and 25℃16 h). 【Result】 Results showed that the sensitivity of potato cultivars to temperature and photoperiod was significantly different. Variety of Atlantic was sensitive to temperature and no tuber formed in treatments of 25℃8 h, 25℃12 h and 25℃16 h, variety of Cooperation 88 was sensitive to photoperiod and no tuber formed in temperature-photoperiod treatments of 15℃16 h and 25℃16 h, no tuber formed for the variety of Zhongdianhong in treatment of 25℃16 h. Only Mira formed tuber in all treatments. Contents of endogenous GA3, ABA and JA in potato leaves were evaluated, and the results showed that the content of GA3 was high in no tuber form conditions and was low in tuber formation condition, content of ABA and JA increased with the potato development in any conditions. 【Conclusion】 GA3 was an important factor inhibiting the tuber formation of potato, content of ABA and JA was more significantly related with senescence than the tuber formation.

Key words: potato ( Solanum tuberosum L.), temperature, photoperiod, endogenous hormone