Evaluation on Main Biological Characters of Host-plant Haloxylon ammodendron and Haloxylon persicum of Cistanche deserticola
Haloxylon ammodendron and Haloxylon persicum,belonging to the family Amaranthaceae,genus Haloxylon Bunge,serve as host plants for Cistanche deserticola.They are widely distributed in the arid zones of China.In this study,biological characteristics and agronomic traits of both species were mainly compared by field observation and molecular identification.The results showed that there were significant differences in phenotypic characters,agronomic traits and pollen structure.Notably,the fruit wing length and 1000-grain weight in H.ammodendron were significantly lower compared to those of H.persicum,but the germination rate and germination potential were significantly higher compared to those of H.persicum.The pollen volume and surface particle structure of H.ammodendron were significantly smaller than those of H.persicum.Additionally,the pollen net of H.ammodendron exhibited a deep structure,while it was shallow and most of it protruding outwards in H.persicum pollens.The correlational analysis revealed significant positive correlations between the agronomic indexes of both H.ammodendron and H.persicum and climate factors such as temperature and humidity.Water and light are the primary limiting factors for the geographic distributionH.persicum in Junggar Basin of Xinjiang,while environmental adaptations ofH.ammodendron were found to be stronger.H.ammodendron and H.persicum can be effectively identified by ITS barcode,and both of them can be parasitized by C.deserticola.However,the survival rate of C.deserticola were different.According to their biological characteristics,cultivating H.ammodendron is with priority in the production of cistanches herba.This study provided a scientific basis for the identification and conservation ofHaloxylon,as well as the selection of optimal hosts for C.deserticola.
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