中国水稻科学 ›› 2022, Vol. 36 ›› Issue (4): 367-376.DOI: 10.16819/j.1001-7216.2022.210805
黄奇娜1,#, 江苏2,#, 汪利民2, 张燕1, 俞林飞1, 李春福1, 丁利群2, 邵国胜1,*()
收稿日期:
2021-08-09
修回日期:
2021-10-02
出版日期:
2022-07-10
发布日期:
2022-07-12
通讯作者:
邵国胜
基金资助:
HUANG Qina1,#, JIANG Su2,#, WANG Limin2, ZHANG Yan1, YU Linfei1, LI Chunfu1, DING Liqun2, SHAO Guosheng1,*()
Received:
2021-08-09
Revised:
2021-10-02
Online:
2022-07-10
Published:
2022-07-12
Contact:
SHAO Guosheng
摘要:
【目的】为了探究低温冷害胁迫后水分/湿度对水稻幼苗根系活力和水分运输等的影响,【方法】以具有低温耐性差异的嘉籼7号和辐8329两个水稻品种为研究材料进行低温胁迫处理后,在进行实验Ⅰ(不同湿度梯度,正常温度培养条件下)和实验Ⅱ(快速回温处理实验,以正常温度恢复为对照)。【结果】实验Ⅰ结果表明,与较低湿度(30%)相比,较高的湿度(60%和90%)可以提高根系活力,有效保证水稻幼苗的存活率并缓解其遭受的低温冷害。水孔蛋白基因OsPIP2;5和OsPIP2;6的表达水平与根系活力密切相关,对水稻的抗寒和低温耐性具有显著的调控作用。实验Ⅱ结果表明,与对照组(CK)相比,快速回温处理后水稻幼苗的含水量和根系活力显著降低;且正常自然恢复状态下,两个水稻品种的存活率明显高于快速回温组幼苗。【结论】低温胁迫显著影响水稻幼苗的生长发育过程。较高的湿度环境有助于缓解幼苗的低温冷害损伤,保证存活率。同时,低温胁迫后的外界环境湿度对水稻幼苗的含水量、根系活力和水孔蛋白相关基因表达有显著影响,其中OsPIP2;5和OsPIP2;6的表达水平与根系活力正相关,在水稻幼苗抵御外界低温冷害过程中起重要作用。因此,与低温胁迫后田间大量灌溉相比,正常温度下土壤缓慢的温度上升对幼苗的根系活力影响较小,有助于其在低温冷害后恢复生命活动。
黄奇娜, 江苏, 汪利民, 张燕, 俞林飞, 李春福, 丁利群, 邵国胜. 低温胁迫后水分对水稻幼苗根系活力和水孔蛋白相关基因表达的影响[J]. 中国水稻科学, 2022, 36(4): 367-376.
HUANG Qina, JIANG Su, WANG Limin, ZHANG Yan, YU Linfei, LI Chunfu, DING Liqun, SHAO Guosheng. Effects of Moisture Content on Root Vigor and the Expression of Aquaporin-related Genes in Rice Seedlings Under Low Temperature Stress[J]. Chinese Journal OF Rice Science, 2022, 36(4): 367-376.
图1 低温处理3 d后的嘉籼7号和辐8329表型变化 A―低温处理前;B―低温处理1 d后;C―低温处理3 d后。
Fig. 1. Phenotype of Jiaxian 7 and Fu 8329 after 3 days of low temperature treatment. A, Before low temperature treatment; B, 1 d of low temperature treatment; C, 3 d of low temperature treatment.
图2 低温胁迫后不同湿度恢复处理嘉籼7号和辐8329的表型、沙子温度变化和存活率 A-嘉籼7号在低湿度(30%)、中湿度(60%)和高湿度(90%)三个湿度处理5 d的表型;B―辐8329在三个湿度处理5 d的表型;C―嘉籼7号和辐8329在不同湿度处理下沙子温度变化;D,嘉籼7号和辐8329在三个湿度处理5 d后的幼苗存活率。数值表示平均值±标准差(n=3)。不同小写字母表示幼苗存活率在处理之间的差异达0.05显著水平。
Fig. 2. Phenotype, sand temperature and survival rate of Jiaxian 7 and Fu 8329 under different humidity after low temperature stress. A, Phenotype of Jiaxian 7 under different humidity conditions(30%,60%,90%); B, Phenotype of Fu 8329 under different humidity conditions; C, Sand temperature of Jiaxian 7 and Fu 8329; D, Survival rate of Jiaxian 7 and Fu 8329. Data were means ± standard deviation (SD) from three replicated experiments (n = 3). Different lowercase letters represent significant differences (P < 0.05).
品种 Variety | 低湿度 Low humidity | 中湿度 Medium humidity | 高湿度 High humidity |
---|---|---|---|
嘉籼7号Jiaxian 7 | 129.75 ± 5.34 d | 170.92 ± 2.60 b | 97.48 ± 3.36 e |
辐8329 Fu 8329 | 144.84 ± 1.78 c | 404.19 ± 18.53 a | 161.63 ± 2.88 b |
表1 嘉籼7号和辐8329三个不同湿度处理5 d后的根系活力
Table 1. Root vigor of Jiaxian 7 and Fu 8329 exposed to different humidity for 5 d. mg/(g·h)
品种 Variety | 低湿度 Low humidity | 中湿度 Medium humidity | 高湿度 High humidity |
---|---|---|---|
嘉籼7号Jiaxian 7 | 129.75 ± 5.34 d | 170.92 ± 2.60 b | 97.48 ± 3.36 e |
辐8329 Fu 8329 | 144.84 ± 1.78 c | 404.19 ± 18.53 a | 161.63 ± 2.88 b |
图3 低温胁迫后不同湿度恢复处理对嘉籼7号和辐8329根系中水孔蛋白相关基因表达量影响。 数值表示±SD(n=3)(t-test);**,表示极显著差异P < 0.01。
Fig. 3. Effect of humidity treatments after chilling stress on relative expression levels of aquaporin-related genes in roots of Jiaxian 7 and Fu 8329. Data were means ± standard deviation (SD) from three replicated experiments (n = 3)(t-test); **, Significant at P < 0.01.
图4 快速回温后嘉籼7号和辐8329的表型、沙子温度变化和存活率 A-对照组(CK);B-快速回温组(QR)处理5 h后;C,常温恢复3 d后的表型;D,快速回温处理后沙子温度变化;E,快速回温处理后的幼苗存活率。数值表示平均值±标准差(n=3),不同的小写字母表示水稻幼苗率在处理之间的显著性差异(P < 0.05)。
Fig. 4. Phenotype, sand temperature and survival rate of Jiaxian 7 and Fu 8329 after quick rewarming. A, Controls; B, Quick rewarming after 5 h of treatment; C, Phenotype of Jiaxian 7 and Fu 8329 with water change test after 3 d; D, Sand temperature of Jiaxian 7 and Fu 8329; E, Survival rate. Data were means ±SD (n = 3). Different lowercase letters represent significant differences (P < 0.05).
图5 快速回温实验常温恢复0,4和8 h后嘉籼7号和辐8329地上部、根系水分含量和含水量百分比 CK表示对照,QR表示快速回温处理,数值表示±SD(n=3),柱形图上不同的小写字母表示P < 0.05。A和B表示地上部和根系的水分含量(g);C和D表示地上部和根系的含水量(%)。
Fig. 5. Moisture content and water content in shoots and roots of Jiaxian 7 and Fu 8329 after 0, 4 and 8 h of treatment. CK, Control; QR, Quick rewarming. Data were means ± standard deviation (SD) from three replicated experiments (n = 3). Different lowercase letters above the error bars represented significant differences (P < 0.05). A, Moisture content of shoots; B, Moisture content of roots; C, Water content (%) of shoots; D, Water content (%) of roots.
品种 Variety | 处理后0 h 0 h after treatment/ (mg·g−1·h−1) | 处理后3 d Three days after treatment/ (mg·g−1·h−1) | ||
---|---|---|---|---|
对照组 CK | 快速回温组 Quick rewarming | 对照组 CK | 快速回温组 Quick rewarming | |
嘉籼7号 Jiaxian 7 | 12.68 ± 0.66 b | 25.40 ± 5.59 a | 181.66 ± 1.85 b | 43.12 ± 2.52 d |
辐8329 Fu 8329 | 9.74 ± 1.49 b | 13.17 ± 1.03 b | 308.67 ± 5.95 a | 87.40 ± 2.97 c |
表2 快速回温和常温恢复对低温胁迫处理后的嘉籼7号和辐8329根系活力的影响
Table 2. Effect of quick rewarming and normal rewarming on root vigor of chilled Jiaxian 7 and Fu 8329.
品种 Variety | 处理后0 h 0 h after treatment/ (mg·g−1·h−1) | 处理后3 d Three days after treatment/ (mg·g−1·h−1) | ||
---|---|---|---|---|
对照组 CK | 快速回温组 Quick rewarming | 对照组 CK | 快速回温组 Quick rewarming | |
嘉籼7号 Jiaxian 7 | 12.68 ± 0.66 b | 25.40 ± 5.59 a | 181.66 ± 1.85 b | 43.12 ± 2.52 d |
辐8329 Fu 8329 | 9.74 ± 1.49 b | 13.17 ± 1.03 b | 308.67 ± 5.95 a | 87.40 ± 2.97 c |
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