关键词:小麦DELLA蛋白; NaCl胁迫; 叶绿素含量; 超氧化物歧化酶; 丙二醛 A Wheat DELLA Gain-of-function Mutant Aibian 1 Promotes Seedling Salt Tolerance WANG Run-Qing1,2,**, FAN Xiao-Cong2,3,**, SONG Mei-Fang2,4, XIAO Yang5, GUO Lin2, MENG Fan-Hua2, YANG Qing-Hua3, WU Da-Fu1,*, YANG Jian-Ping1,2,* 1School of Life Science & Technology, Henan Institute of Science and Technology, Xinxiang 453000, China
2Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing 100081, China
3College of Agronomy, Henan Agricultural University / Collaborative Innovation Center of Henan Grain Crops, Zhengzhou 450002, China
4 Beijing Radiation Center, Beijing 100875, China
5 Graduate School of Chinese Academy of Agricultural Sciences, Beijing 100081, China
Fund:This study was supported by the National Key R&D Program of China (Pilot Project on Seven Main Crop Breeding) (2016YFD101802 ), the Natural Science Foundation of Beijing (Key Program) (6151002) and the Agricultural Science and Technology Innovation Program of CAAS AbstractDELLA proteins are negative regulators in GA signal pathway. DELLA protein is able to response to various environmental signals and plays an important role in plant resistance to biotic and abiotic stresses. The DELLA gain-of-function mutant Aibian 1 has been widely applied in wheat breeding for dwarfness, but its tolerance to salt is unclear. In this study, Aibian 1 was compared with Chinese Spring, Jing 411, and Aiganzao in salt tolerance using Hoagland’s hydroponic culture with 200 mmol L-1 NaCl. Total chlorophyll content, relative water content, superoxide dismutase (SOD) activity and malondialdehyde (MDA) content were measured to evaluate the ability of salt tolerance. Immunoblot assay was employed to assess the DELLA protein abundance in wheat seedlings. After seven-day NaCl treatment, Aibian 1 showed no clear withering leaves, whereas the other three cultivars displayed obviously wilting and yellowing leaves. Among the four cultivars, Aibian 1 had the least loss on chlorophyll content and relative water content, the highest SOD activity, and the lowest levels of MDA content after salt treatment. Immunoblot assay indicated the highest accumulation of DELLA protein in Aibian 1 among the four cultivars. Thus, we consider the high level of DELLA protein is closely related to salt tolerance in Aibian 1.
Keyword:Wheat DELLA proteins; Salt tolerance; Chlorophyll content; Superoxide dismutase; Malondialdehyde Show Figures Show Figures
图1 盐胁迫前后的小麦幼苗形态 小麦种子28℃催芽24 h后在蛭石中22℃生长4 d (A和B), 然后在Hoagland液(pH 6.0)中缓冲2 d, 再分别转入不含(C)或含(D) 200 mmol L-1 NaCl的Hoagland培养液(pH 6.0)生长7 d。E图是D图方框部分的局部放大。1: 中国春; 2: 京411; 3: 矮秆早; 4: 矮变1号。Bar = 2 mm。Fig. 1 Morphology of wheat seedlings in response to salt stress Wheat seeds were germinated at 28 ° C for 24 h and grown in vermiculite for 4 d in greenhouse at 22 ° C (panels A and B). Wheat seedlings were carefully transferred into the Hoagland’ s solution (pH 6.0) for 2 d to buffer and finally cultured in Hoagland’ s solution without (panel C) or with (panel D) 200 mmol L-1 NaCl for 7 d. Panel E is the enlargement of framed parts in panel D. 1: Chinese Spring; 2: Jing 411; 3: Aiganzao; 4: Aibian 1. Bar = 2 mm.
图2 盐胁迫和无胁迫下4个小麦品种的叶绿素含量(A)和相对含水量(B)变化 数据为3次生物学重复的平均值和标准差。Fig. 2 Changes of chlorophyll content (A) and relative water content (B) in four wheat cultivars under treatment with or without salt stress Data are the means and standard deviations of three biological repeats.
图3 盐胁迫和无胁迫下4个小麦品种中MDA含量(A)和SOD活性(B)的变化 数据为3次生物学重复的平均值和标准差。Fig. 3 Changes of MDA content (A) and SOD activity (B) in four wheat cultivars under treatments with or without salt stress Data are the means and standard deviations of three biological repeats.
图4 4个小麦品种的幼苗在白光或黑暗下DELLA蛋白的免疫印迹检测 A: 22℃白光(30.0 µ mol m-2 s-1)生长6 d; B: 22℃黑暗生长6 d。HSP82免疫印迹显示大约相当的上样量。Fig. 4 Immunoblot analysis of DELLA protein accumulation in four wheat cultivars under white light or darkness A: Seedlings were grown for six days under 22° C and white light (30.0 µ mol m-2 s-1); B: Seedlings were grown for six days under 22℃ and darkness. Anti-HSP82 immunoblots indicates approximately equal loading.
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