1887

Abstract

Impact of periodic drought stress on photosynthesis changes was examined in branchlets of Haloxylon aphyllum. Parameters F0, Fm, Fv, and the amounts of chlorophyll a and chlorophyll b were the traits that were measured in this experiment. Drought stress factor was considered as lack of irrigation of potted-seedlings of two haloxylon species in periods 0, 2, 4, 6... 26 and 28 days, and each drought period were repeated 6 times. Analysis of variance showed that drought stress had significant impact on the parameters F0, Fm, Fv, Fv/Fm and t1/2 with 99% probability in the haloxylon. Drought stress intensity was significantly effective on the amount of both chlorophyll a and b and total chlorophyll at 99% level in Haloxylon aphyllum. Drought stress was extremely affected on values of chlorophyll a and b, and reduced them up to more than 50% compared to the control. The obtained data were reviewed within the format of a Randomized Complete Design. Analysis of data was made by using two-side variance analysis; and comparison of averages was made by using Duncan's test. Key words: Haloxylon, photosynthesis, stress, drought, fluorescence

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/content/papers/10.5339/qfarf.2013.EEP-02
2013-11-20
2019-11-15
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