Effects of Temperature and Potassium Chlorate on Leaf Gas Exchange and Flowering in Longan
The effects of low temperature and potassium chlorate (KCIO3) on leaf gas exchange and flowering of sixty four grafted longan trees cv.Daw (Dimocarpus longan Lour.) were investigated.The longan trees were kept in two growth chambers under low temperature (17/12℃ day/night),high temperature (30/25℃ day/night) half of the trees in each room were treated with KCIO3,respectively. The results showed that flower emergence in longan occurred 37 days following low temperature and high temperature exposure with KCIO3 treatment, while low temperature with KCIO3 delayed flowering and high temperature exposure completely inhibited flowering.Efficiency of photosystem Ⅱ (Fv/Fm) as well as leaf net CO2 assimilation rate decreased under low temperature and KCIO3 treatments,when compared to the high temperature treatments. Transpiration rate and stomatal conductance were both reduced in low temperature no matter whether KCIO3 was applied. After 28 days,when temperature in low temperature treatments were increased,net CO2 assimilation rate,transpiration rate and stomatal conductance also increased to similar values found in high temperature treatments. Both temperature and KCIO3 treatments did not affect the chlorophyll content of longan leaves.
Dimocarpus longan KCIO3 chlorophyll fluorescence net CO2 assimilation stomata conductance
C.Sritontip P.Tiyayon M.Hegele P.Sruamsiri D.Naphrom P.Manochai J.N.Wünsche
Lampang Agricultural Research and Training Center,Rajamangala University of Technology Lanna,Lampang Institute for Special Crops Cultivation and Crop Physiology,University of Hohenheim,Stuttgart,German Department of Horticulture,Chiang Mai University,Chiang Mai,Thailand Department of Horticulture,Mae Jo University,Chiang Mai,Thailand
国际会议
福州
英文
323-328
2008-08-25（万方平台首次上网日期，不代表论文的发表时间）