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| Effects of Delftia sp. B9 on rice seed germination and cadmium accumulation in rice seedlings under Cd stress |
| Received:March 11, 2019 |
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| KeyWord:Delftia sp. B9;cadmium stress;siderophores;chlorophyll |
| Author Name | Affiliation | E-mail | | LIU Yu-ling | College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
Engineering Research Center for Water Pollution Purification of Irrigation Source in Hunan Province, Changsha 410128, China
Hunan Engineering Research Center for Safe and High-Efficient Utilization of Heavy Metal Pollution Farmland, Changsha 410128, China | | | PENG Ou | College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
Engineering Research Center for Water Pollution Purification of Irrigation Source in Hunan Province, Changsha 410128, China
Hunan Engineering Research Center for Safe and High-Efficient Utilization of Heavy Metal Pollution Farmland, Changsha 410128, China | | | TIE Bai-qing | College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
Engineering Research Center for Water Pollution Purification of Irrigation Source in Hunan Province, Changsha 410128, China
Hunan Engineering Research Center for Safe and High-Efficient Utilization of Heavy Metal Pollution Farmland, Changsha 410128, China | tiebq@qq.com | | LIU Yi-ting | College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China | | | LUO Hai-yan | College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
Engineering Research Center for Water Pollution Purification of Irrigation Source in Hunan Province, Changsha 410128, China
Hunan Engineering Research Center for Safe and High-Efficient Utilization of Heavy Metal Pollution Farmland, Changsha 410128, China | | | LI Dan-yang | College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
Engineering Research Center for Water Pollution Purification of Irrigation Source in Hunan Province, Changsha 410128, China
Hunan Engineering Research Center for Safe and High-Efficient Utilization of Heavy Metal Pollution Farmland, Changsha 410128, China | | | LIU Shou-tao | College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
Engineering Research Center for Water Pollution Purification of Irrigation Source in Hunan Province, Changsha 410128, China
Hunan Engineering Research Center for Safe and High-Efficient Utilization of Heavy Metal Pollution Farmland, Changsha 410128, China | |
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| Abstract: |
| To explore the effects of Delftia sp. B9 strain on seed germination and Cd accumulation in rice seedlings, three different levels of Cd stress (0, 0.01, and 0.1 mg·L-1) were applied to two rice varieties (Huarun No. 2 and Shenliangyou No. 5814) following inoculation of Delftia sp. B9 strain. The results showed that Delftia sp. B9 produced 2.87 mg·L-1 less indoleacetic acid under 0.1 mg·L-1 Cd stress, whereas the siderophore production decreased by 17.34%, accordingly. The addition of Delftia sp. B9 had a significant role in promoting rice seed germination and tolerance coefficient under 0.1 mg·L-1 Cd stress. Exposure to Delftia sp. B9 stress (T3) significantly increased the root length, height, and chlorophyll a and chlorophyll b content of the two rice varieties compared to that of the control (T1). After the addition of Delftia sp. B9, the Cd concentrations in the roots, stems, and leaves of Huarun No. 2 were decreased by 63.81%, 67.59%, and 70.84%, respectively, and correspondingly decreased by 75.95%, 74.84%, and 80.81% in Shenliangyou No.5814. The results showed that the Cd-tolerant bacteria Delftia sp. B9 promoted germination of rice seed and increase chlorophyll content and plant height of rice seedlings under Cd stress, while reducing Cd content in the roots, stems, and leaves of rice seedlings. |
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