Physiological Basis of Jackfruit Split Skin Disease Induced by Drought Stress
The jackfruit is one of the important tropical fruits in China.In case of studying on the key pathogenic factors of jackfruit skin splitting disease and the mechanism of drought induced jackfruit skin splitting disease,the growth characters and photosynthesis indexes of jackfruit seedlings under different water gradients of 40％,30％,20％and 10％and drought stress of 3,6 and 9 days were measured by designing different pot water control experiments.The results showed that 10％water drought treatment had the greatest impact on the leaf area,the leaf length,the leaf width and the chlorophyll content of'Qiongyin No.1'and'Qiongyin No.8'jackfruits,with the leaf growth＜0;the photosynthetic indicators such as the chlorophyll content and the net photosynthetic rate significantly decreased,both of which were significantly lower than that of CK.Under drought stress for 9 days,leaf areas of two strains showed significant changes,with growth rates of-33.48％and-42.16％respectively,followed by growth rates of-27.82％and-34.12％for the leaf lengths,both of which were＜0,and significantly lower than the growth rates of CK;the photosynthetic indicators such as the chlorophyll contents and the net photosynthetic rates significantly decreased,both of which were significantly lower than that of CK;the effects of different short-term drought stress on stem circumferences and plant heights were not significant.In the range of 10％～40％moisture concentrations,with the decrease of soil moisture contents and the increase of drought time,the impact on the growth characteristics of jackfruit plants was more obvious,and the impact degrees were in the order of moisture contents 10％＞20％＞30％＞40％;the decreasing trends of the drought duration were 9 days＞6 days＞3 days.This study elucidated the effects of different drought stress on the growth and photosynthetic physiological system of jackfruits,which was to provide a basic support for the research on the pathogenic mechanism of jackfruit skin splitting disease induced by drought and the reasonable water use in production.
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维普
