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作物学报 ›› 2021, Vol. 47 ›› Issue (5): 894-903.doi: 10.3724/SP.J.1006.2021.02048

• 耕作栽培·生理生化 • 上一篇    下一篇

水稻内源油菜素甾醇对施氮量的响应及其对颖花退化的调控作用

姚佳瑜1,2(), 于吉祥1,2, 王志琴1,2, 刘立军1,2, 周娟1,2, 张伟杨1,2,*(), 杨建昌1,2,*()   

  1. 1江苏省作物遗传生理重点实验室 / 江苏省作物栽培生理重点实验室 / 扬州大学农学院, 江苏扬州225009
    2江苏省粮食作物现代产业技术协同创新中心 / 扬州大学, 江苏扬州225009
  • 收稿日期:2020-07-14 接受日期:2020-11-13 出版日期:2021-05-12 网络出版日期:2020-12-23
  • 通讯作者: 张伟杨,杨建昌
  • 作者简介:E-mail: yaojiayuyzu@163.com
  • 基金资助:
    国家自然科学基金项目(31901445);国家自然科学基金项目(31771710);江苏省大学生实践创新训练计划项目(201911117010Z);国家重点研发计划(2016YFD0300206-4);国家重点研发计划(2018YFD0300800);国家重点研发计划(2017YFD0301206);中国博士后科学基金资助项目(2018M640528);江苏高校优势学科建设工程项目(PAPD);扬州大学高端人才支持计划项目(2015-01)

Response of endogenous brassinosteroids to nitrogen rates and its regulatory effect on spikelet degeneration in rice

YAO Jia-Yu1,2(), YU Ji-Xiang1,2, WANG Zhi-Qin1,2, LIU Li-Jun1,2, ZHOU Juan1,2, ZHANG Wei-Yang1,2,*(), YANG Jian-Chang1,2,*()   

  1. 1Jiangsu Key Laboratory of Crop Genetics and Physiology / Jiangsu Key Laboratory of Crop Cultivation and Physiology / Agricultural College of Yangzhou University, Yangzhou 225009, Jiangsu, China
    2Jiangsu Co-Innovation Center for Modern Production Technology of Grain Crops / Yangzhou University, Yangzhou 225009, Jiangsu, China
  • Received:2020-07-14 Accepted:2020-11-13 Published:2021-05-12 Published online:2020-12-23
  • Contact: ZHANG Wei-Yang,YANG Jian-Chang
  • Supported by:
    Natural Science Foundation of China(31901445);Natural Science Foundation of China(31771710);Training Programs of Innovation and Entrepreneurship for Undergraduates of Jiangsu Province(201911117010Z);Development Program of China(2016YFD0300206-4);Development Program of China(2018YFD0300800);Development Program of China(2017YFD0301206);Project funded by China Postdoctoral Science Foundation(2018M640528);Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD);Top Talent Supporting Program of Yangzhou University(2015-01)

摘要:

为探明油菜素甾醇(brassinosteroids, BRs)是否介导氮肥对水稻颖花退化的影响。水稻品种扬稻6号和甬优2640种植于盆钵, 全生育期设置3种施氮水平, 观察了不同氮肥处理下水稻减数分裂期幼穗中氮含量、BRs、过氧化氢(H2O2)和总抗氧化能力(total antioxidant capacity, T-AOC)水平及其与颖花退化的关系。结果表明, 颖花退化率的降低与稻穗中增加的24-表油菜素甾酮(24-epicastasterone, 24-epiCS)和28-高油菜素内酯(28-homobrassinolide, 28-homBL)含量密切相关。当稻穗的氮含量为1.25%时, 幼穗中BRs (24-epiCS和28-homBL)含量显著增加, 颖花退化率显著降低。稻穗中T-AOC水平与BRs含量变化趋势相同, 且均与水稻颖花退化率显著负相关, 而H2O2含量与BRs含量和T-AOC变化趋势相反。施用外源BRs (24-epiCS或28-homBL)可显著提高稻穗中内源BRs (24-epiCS和28-homBL)含量与T-AOC水平, 并显著降低稻穗中H2O2含量和颖花退化率, 施用BRs合成抑制剂则效果相反。表明BRs可以介导氮肥对水稻颖花退化的调控, 在减数分裂期适宜的稻穗含氮量(1.25%)可有效提高幼穗中的BRs含量, 并通过提高抗氧化能力来抑制颖花退化。

关键词: 油菜素甾醇, 氮素, 水稻, 颖花退化

Abstract:

In order to investigate whether and how brassinosteroids (BRs) mediate the effect of nitrogen (N) rates on spikelet degeneration of rice, rice cultivars Yangdao 6 and Yongyong 2640 were grown in pots subjected to three N rates in the whole growth periods. The contents of N, BRs, hydrogen peroxide (H2O2) and total antioxidant capacity (T-AOC) in young rice panicles at meiosis stage and their relationship with spikelet degeneration rate were observed. The results showed that the decreased spikelet degeneration rate was closely associated with enhanced 24-epicastasterone (24-epiCS) and 28-homobrassinolide (28-homBL) contents in young panicles. When N content of rice panicle was 1.25%, the BRs (24-epiCS and 28-homBL) content in young panicle increased significantly, and the spikelet degeneration rate decreased. The variation trend of T-AOC level was very consistent with BRs, and T-AOC was significantly negatively correlated with spikelet degeneration rate, whereas the variation trend of H2O2 content was opposite to that of T-AOC and BRs contents in the young panicles. Application of exogenous BRs (24-epiCS or 28-homBL) to young panicles could significantly increase the T-AOC level and contents of endogenous 24-epiCS and 28-homBL, but significantly reduce the H2O2 content and spikelet degeneration rate, while application of BRs synthesis inhibitor had the opposite effect. In summary, BRs mediated the effects of N application rates on spikelet degeneration, and elevated BRs contents in young panicles could inhibit spikelet degeneration by elevating antioxidant capacity under a proper panicle N content (1.25%) at meiosis stage in rice.

Key words: brassinosteroids, nitrogen, rice (Oryza sativa L.), spikelet degeneration

表1

不同施氮量处理对水稻颖花发育、产量和产量构成因素的影响"

年份/品种/处理
Year/cultivar/treatment
每盆穗数
Number of panicle
每穗分化颖花数
Differentiated spikelets per panicle
颖花退化率
Spikelet degeneration rate (%)
每穗粒数
Spikelets per panicle
结实率
Fully-filled grains rate (%)
千粒重
1000-grain weight (g)
产量
Grain yield
(g pot-1)
2015
扬稻6号YD-6
低氮LN 15.0 ± 0.56 c 188 ± 2.69 c 8.32 ± 0.29 b 170 ± 2.95 b 89.1 ± 0.98 a 28.3 ± 0.48 a 62.9 ± 2.20 c
中氮MN 19.9 ± 0.72 b 201 ± 2.87 a 7.49 ± 0.04 c 181 ± 4.22 a 86.5 ± 1.03 b 27.0 ± 0.53 ab 83.7 ± 2.55 a
高氮HN 22.3 ± 0.91 a 195 ± 2.78 b 9.68 ± 0.12 a 172 ± 2.21 b 80.0 ± 0.71 c 25.9 ± 0.83 b 78.2 ± 2.91 b
甬优2640 YY-2640
低氮LN 14.2 ± 0.57 b 293 ± 5.79 c 14.9 ± 0.16 a 245 ± 5.06 b 84.4 ± 1.80 a 25.4 ± 0.37 a 73.6 ± 3.47 b
中氮MN 17.8 ± 0.23 a 336 ±4.80 b 13.4 ± 0.34 b 276 ± 3.73 a 78.7 ± 2.66 b 24.8 ± 0.38 a 95.3 ± 1.61 a
高氮HN 18.5 ± 0.40 a 347 ± 4.96 a 11.8 ± 0.27 c 282 ± 5.76 a 72.7 ± 2.07 c 24.5 ± 0.27 a 91.6 ± 3.41 a
2016
扬稻6号YD-6
低氮LN 14.4 ± 0.36 c 185 ± 2.45 b 8.52 ± 0.56 ab 172 ± 2.25 b 90.3 ± 1.59 a 28.6 ± 0.70 a 65.5 ± 2.38 c
中氮MN 19.5 ± 0.83 b 198 ± 3.19 a 7.55 ± 0.31 b 179 ± 3.43 a 87.1 ± 0.99 b 27.3 ± 0.75 ab 85.0 ± 2.70 a
高氮HN 22.1 ± 0.76 a 191 ± 3.01 ab 9.36 ± 0.47 a 174 ± 2.06 ab 79.0 ± 1.72 c 26.1 ± 1.14 b 80.2 ± 4.42 b
甬优2640 YY-2640
低氮LN 13.8 ± 0.75 c 292 ± 5.76 b 15.8 ± 0.33 a 241 ± 7.12 b 84.1 ± 2.33 a 25.6 ± 0.52 a 73.1 ± 4.05 b
中氮MN 17.4 ± 0.41 b 330 ± 6.23 a 13.8 ± 0.32 b 272 ± 5.69 a 80.7 ± 1.22 b 25.0 ± 0.60 ab 97.3 ± 3.01 a
高氮HN 18.9 ± 0.61 a 341 ± 4.59 a 12.5 ± 0.29 c 278 ± 8.58 a 74.3 ± 1.53 c 24.1 ± 0.49 b 93.6 ± 4.58 a

图1

不同施氮量处理对稻穗含氮量(A, B)的影响 缩略词同表1。数据为平均值±标准误, 品种柱上方不同字母表示0.05水平上差异显著(同一品种内比较, n = 5)"

图2

不同施氮量处理对稻穗中24-表油菜素甾酮(24-epiCS) (A, B)和28-高油菜素内酯(28-homoBL) (C, D)含量的影响 缩写同表1。数据为平均值±标准误, 品种柱上方不同字母表示0.05水平上差异显著(同一品种内比较, n = 3)。"

图3

不同施氮量处理对稻穗中总抗氧化能力(T-AOC) (A, B)和过氧化氢(H2O2) (C, D)含量的影响 缩写同表1。数据为平均值±标准误, 品种柱上方不同字母表示在0.05水平上差异显著(同一品种内比较, n=3)。"

图4

稻穗含氮量与油菜素甾醇(BRs) (A, B)、总抗氧化能力(T-AOC) (C)、过氧化氢(H2O2) (D)含量和颖花退化率(E)的关系 *, **分别代表在0.05和0.01水平上差异显著(n = 12)。"

图5

稻穗中油菜素甾醇(BRs)含量与总抗氧化能力(T-AOC) (A, B)、过氧化氢(H2O2)含量(C, D)和颖花退化率(E, F)的关系 **表示在0.05和0.01水平上差异显著(n = 12)。"

表2

外源化学调控物质对稻穗中油菜素甾醇(BRs)、总抗氧化能力(T-AOC)和过氧化氢(H2O2)水平的影响"

品种
Cultivar
生理指标
Physiological parameter
化学物质处理 Chemical treatment
CK T1 T2 T3 T4
扬稻6号 24-epiCS (pmol g-1 DW) 37.9 ± 2.28 c 58.6 ± 2.61 a 50.4 ± 1.72 b 14.8 ± 1.01 d 37.2 ± 2.26 c
YD-6 28-homoBL (pmol g-1 DW) 73.7 ± 3.54 c 106 ± 4.99 b 126 ± 3.62 a 35.4 ± 2.07 d 79.3 ± 4.12 c
T-AOC (U g-1 DW) 80.3 ± 2.58 b 114 ± 4.09 a 119 ± 5.08 a 34.6 ± 2.46 c 79.8 ± 2.26 b
H2O2 (μmol g-1 DW) 7.68 ± 0.78 b 4.24 ± 0.26 c 4.17 ± 0.25 c 17.76 ± 0.56 a 7.76 ± 0.68 b
甬优2640 24-epiCS (pmol g-1 DW) 21.5 ± 1.18 c 38.5 ± 1.45 a 31.3 ± 1.21 b 10.8 ± 0.48 d 21.9 ± 0.83 c
YY-2640 28-homoBL (pmol g-1 DW) 32.2 ± 1.35 c 52.6 ± 2.87 b 62.7 ± 2.07 a 15.3 ± 0.71 d 32.1 ± 1.58 c
T-AOC (U g-1 DW) 36.4 ± 1.38 b 50.9 ± 1.74 a 51.7 ± 1.91 a 16.0 ± 0.55 c 35.4 ± 2.23 b
H2O2 (μmol g-1 DW) 14.9 ± 1.22 b 7.81 ± 0.46 c 7.50 ± 0.49 c 33.8 ± 1.63 a 13.7 ± 0.96 b

表3

外源化学调控物质对水稻颖花分化与退化、每穗粒数、饱粒率和粒重的影响"

品种
Cultivar
处理
Treatment
每穗颖花分化数
Differentiated spikelets per panicle
颖花退化率
Spikelet
degeneration rate (%)
每穗粒数
Spikelets per
panicle
饱粒率
Fully-filled grains rate (%)
千粒重
1000-grain weight
(g)
扬稻6号 CK 204 ± 2.25 a 7.35 ± 0.19 c 185 ± 3.77 bc 88.2 ± 1.69 b 27.2 ± 0.38 a
YD-6 T1 202 ± 3.18 a 4.12 ± 0.17 e 194 ± 3.50 ab 92.3 ± 1.81 a 26.8 ± 0.40 a
T2 205 ± 2.68 a 4.75 ± 0.09 d 196 ± 3.83 a 92.2 ± 1.80 a 26.6 ± 0.52 a
T3 201 ± 3.11 a 15.3 ± 0.29 a 172 ± 1.84 c 76.5 ± 1.65 c 27.4 ± 0.84 a
T4 207 ± 3.49 a 8.03 ± 0.15 b 187 ± 2.61 d 88.3 ± 1.35 b 27.1 ± 0.41 a
甬优2640 CK 346 ± 5.61 a 14.2 ± 0.37 b 292 ± 3.94 b 81.3 ± 1.02 b 24.9 ± 0.40 ab
YY-2640 T1 348 ± 6.63 a 8.92 ± 0.25 c 313 ± 5.40 a 84.2 ± 1.37 a 24.4 ± 0.29 ab
T2 343 ± 4.95 a 9.07 ± 0.17 c 310 ± 4.56 a 84.4 ± 1.45 a 24.4 ± 0.30 ab
T3 349 ± 4.42 a 28.4 ± 0.87 a 241 ± 2.97 c 65.3 ± 1.04 c 25.3 ± 0.60 a
T4 346 ± 5.03 a 14.6 ± 0.51 b 288 ± 4.41 b 80.6 ± 1.53 b 25.0 ± 0.37 ab
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