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Effects of Low Temperature Stress and INA Bacteria on Chlorophyll a Fluorescence Induction Kinetics in Young Fruit of Two Apricot Cultivars |
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| Authors: | YANG Jian-min MENG Qing-rui PENG Wei-xiu WANG Xue-dong ZHANG Yuan-hui SUN Fu-Zai ZHAO Ting-Chang LI Shao-hua |
| Institution: | 1. College of Forestry, Hebei Agricultural University, Baoding 071000, P.R.China 2. Institute of Plant Protection, Chinese Aeademy of Argricultural Sciences, Beijing 100094, P.R.China 3. College of Horticultural Sciences, China Agricultural University, Beijing 100094, P.R.China |
| Abstract: | Effects of low temperature and INA bacteria on the change of chlorophyll a fluorescence inyoung fruit from two apricot cultivars were investigated. Low temperature decreased the potential activity(Fv/Fo) ,conversion efficiency of primary light energy (Fv/Fm)of PS Ⅱ and photochemical quenching (qP) inyoung fruit of two apricot cultivars. Low temperature enhanced non-photochemical quenching qN, decreasingthe quantum yield of photosynthetic electron transfer. The presence of ice nucleating active (INA) bacteria in-tensified the effects of low temperature, raised the injury temperature threshold from - 4℃ to - 2 - - 3℃.INA bacteria can be a factor to induce frost susceptibility of apricot fruit. The amount of damaged PS Ⅱ activi-ty center was related to apricot fruit size and cultivar. |
| Keywords: | Apricot Young fruit Chlorophyll a fluorescence qP qN Cold resis-tance Ice nucleating active bactetia |
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