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| Effects of Different Concentrations Exogenous Selenium Application on Selenium Content and Nutritional Indices of Konjac Bulbs |
| CAI Yangguang，DUAN Longfei，QIN Jianfeng，ZHOU Gaoxin* ，TANG Xiaodong，XU Cong，GUO Bangli |
| Ankang Academy of Agricultural Sciences，Ankang 725000，Shaanxi，China |
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Abstract In order to verify the selenium enrichment and selenium tolerance properties of flower
konjac，amorphophallus albus and optimum line ZL-19 from their hybrid offspring；and effects of exogenous selenium on nutrients of Amorphophallus Rivieri corms，this paper carried out root irrigation test with different concentrations of sodium selenite（0，5，10，20，40 mg · kg-1 ）using potting method．The results showed that the highest selenium content in corms of different varieties（lines）were as following：Zl-19 was equivalent to amorphophallus albus（0.192 mg · kg-1 ），lower than that of flower konjac（0.265 mg · kg-1 ）．In selenium tolerance：ZL-19 ＞ amorphophallus albus ＞ flower konjac．While，in selenium enrichment capacity：flower konjac ＞ ZL-19 ＞ amorphophallus albus．When the concentration of exogenous selenium in flower konjac was 10 mg · kg-1 ，the general performance of various nutritional indexes of the corms were comparatively excellent．And the corm fresh weight was increased by 13.13%．The contents of total sugar，reducing sugar，total protein，soluble protein and GSH-Px activity in corm were 71.265，27.019，50.811，17.605 mg · g-1 and 1.845 U · g-1 ，respectively．When the concentration of exogenous selenium in amorphophallus albus was 20 mg · kg-1 ，the general performance of various nutritional indexes of
the corms were comparatively excellent．And the corm fresh weight was increased by 12.94%．The contents of total sugar，reducing sugar，total protein，soluble protein and GSH-Px activity in corms were 97.012，29.632，52.773，16.892 mg · g-1 and 1.642 U · g-1 ，respectively．Also when the concentration of exogenous selenium in ZL-19 was 20 mg · kg-1 ，the general performances of various nutritional indexes of the corms were comparatively excellent．The corm fresh weight was increased by 28.80%．The contents of total sugar，reducing sugar，total protein and soluble protein and GSH-Px activity in corms reached 84.717，31.819，49.402，17.709 mg · g-1 and 1.719 U · g-1 ，respectively．
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Received: 27 November 2023
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