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盐胁迫对稻米中矿质元素和抗氧化物质含量的影响
许江环,杨善,王盼盼,郭海峰,周鸿凯
0
(广东海洋大学 滨海农业学院, 广东 湛江 524088)
摘要:
为探究盐胁迫对水稻糙米中抗氧化物质和矿质元素含量的影响,以‘海红11’、‘海红12’、‘建新99’、‘阳山香稻’、‘香粘3号’和‘泰香粘’等6个基因型水稻为材料,设置9个含有NaCl的土壤处理(0、0.5、1.0、1.5、2.0、2.5、3.0、3.5和4.0 g/kg),分别测定稻米中抗氧化物质(抗坏血酸、植酸、花青素和总黄酮)和矿质元素(P、Fe、Zn、Mg、Se和Mn)的含量,并进行典型相关和典型冗余分析。结果表明:不同NaCl浓度处理下,1)稻米中花青素含量的累积受到基因型和NaCl处理相互独立的影响,而P、Zn、Fe和Se的含量均在互作效应上达到显著相关。2)在不同的NaCl处理中,除1.5 g/kg的NaCl处理,‘建新99’稻米中植酸含量均为最低,分别较其他8个处理中含量最高的基因型低72%~92%;除0.5、1.0 和3.5 g/kg的NaCl处理,‘海红12’稻米中抗坏血酸含量均为最高,分别较其他6个处理中含量最低的基因型高105%~566%;‘海红11’、‘海红12’和‘建新99’ 稻米中总黄酮含量均显著高于其他3个基因型。3)对稻米中矿质元素和抗氧化物质进行典型相关和典型冗余分析。典型相关分析表明稻米中第Ⅰ对典型变量(U1V1)相关系数λ为0.546(P<0.01),在这一对典型变量中,在一定范围内,随着Zn和Se含量的降低以及Fe含量的增加,稻米中抗坏血酸和植酸的含量呈上升趋势。典型冗余分析结果表明,第 Ⅰ 对典型变量中抗氧化物质含量的变量组U1对自身含量变异的解释程度为39.1%,矿质元素含量的变量组V1对自身含量变异的解释程度为20.2%;同时,抗氧化物质含量的变量组U1解释了矿质元素含量的变量组V1总变异程度的11.7%,矿质元素含量的变量组V1解释了抗氧化物质含量变量组U1总变异的6.0%。综上,不同NaCl处理下,抗坏血酸和植酸含量在不同基因型稻米中差异显著;除Mg外,其他矿质元素含量在不同NaCl浓度处理间差异均达显著。在基因型和不同NaCl处理的互作效应下,稻米中Fe的含量分别与抗坏血酸和植酸含量呈显著正相关,而Zn和Se的含量分别与抗坏血酸和植酸含量呈显著负相关。
关键词:  稻米  抗氧化物质  矿质元素  盐胁迫  典型相关
DOI:10.11841/j.issn.1007-4333.2022.06.03
投稿时间:2021-06-05
基金项目:广东省重点领域研发计划资助(2020B020219004);广东省普通高校省级重大科研项目(2017KZDXM044);湛江市科技专项资金(2020A06013)
Effects of salt stress on the contents of mineral elements and antioxidant substances in rice
XU Jianghuan,YANG Shan,WANG Panpan,GUO Haifeng,ZHOU Hongkai
(College of Coastal Agricultural Sciences, Guangdong Ocean University, Zhanjiang 524088, China)
Abstract:
In order to investigate the variability of antioxidant substances and mineral elements in brown rice under salt stress, six genotypes of rice, ‘Haihong 11', ‘Haihong 12', ‘Jianxin 99', ‘Yangshanxiangdao', ‘Xiangzhan 3' and ‘Taixiangzhan', were taken as materials. Nine soil treatments with different NaCl content(0, 0. 5, 1. 0, 1. 5, 2. 0, 2. 5, 3. 0, 3. 5 and 4. 0 g/kg), were used to determine antioxidant substances(ascorbic acid, phytic acid, anthocyanin and total flavonoids)and mineral elements(P, Fe, Zn, Mg, Se and Mn)in rice. Canonical correlation and canonical redundancy analysis were performed. The results showed that: 1)The accumulation of anthocyanin content in rice was affected by the independent interaction between genotype and NaCl treatment, while the contents of P, Zn, Fe and Se were significantly correlated with each other. 2)The phytic acid content of ‘Jianxin 99' rice was the lowest among the different NaCl concentrations except for 1. 5 g/kg NaCl treatment, which was 72% to 92% lower than that of the genotypes with the highest content in the eight treatments, respectively. Except for the NaCI treatment of 0. 5, 1. 0 and 3. 5 g/kg, the content of ascorbic acid in ‘Haihong 12' rice was the highest, which was 105% to 566% higher than that of the genotype rice with the lowest content in the six treatments. 3)The canonical correlation and canonical redundancy analysis were carried out for mineral elements and antioxidant substances in rice. The results of canonical correlation analysis showed that the correlation coefficient of the first pair of canonical variables(U1, V1)was 0. 546(P<0. 01), and of this pair of typical variables, with the decrease of Zn and Se content and the increase of Fe content, the contents of ascorbic acid and phytic acid in rice tended to increase. The results of canonical redundancy analysis displayed that the first pair of canonical variables explained 39. 1% of the variation of antioxidant indexes and 20. 2% of the variation of mineral elements, while antioxidant indexes explained 11. 7% of the total variation of mineral elements and mineral elements explained 6. 0% of the total variation of antioxidant indexes. In conclusion, under different NaCl treatment, the contents of ascorbic acid and phytic acid were significantly different among different genotypes of rice; except Mg, the accumulation of other mineral elements was significantly different between treatments with different NaCl. Under the interaction of genotypes and different NaCl treatments, Fe content was significantly positively correlated with ascorbic acid and phytic acid contents, while Zn and Se contents were significantly negatively correlated with ascorbic acid and phytic acid contents, respectively.
Key words:  rice  antioxidant substance  mineral elements  salt stress  canonical correlation