The effect of genome duplication on seed germination and seedling growth of rice under salt stress
The effect of genome duplication on seed germination and seedling growth of rice under salt stress
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盐胁迫下基因组复制对水稻种子萌发及幼苗生长的影响
DOI：
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发表时间：
2013-11
影响因子：
--
通讯作者：
X Xue
中科院分区：
文献类型：
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作者：
Z Song;Y He;D Cai;X Xue
多倍体被广泛认为有助于提高植物对极端环境的适应性。基因组复制对盐胁迫下水稻发育影响的报道很少。本研究以四倍体水稻品种和二倍体水稻祖先为研究对象，研究了6种不同盐度条件下基因组重复对水稻种子萌发和幼苗生长的影响。结果表明，盐胁迫在两个阶段都有较大的负面影响，但基因组复制在调节不同水稻品种对盐胁迫的响应中具有重要的积极作用。四倍体水稻品种在盐胁迫下的发芽率普遍高于二倍体品种；其中，品种Nipponbare-4x和HN2026-4x在150 mM NaCl条件下的发芽率为50%左右。所有二倍体和四倍体品种的生长均受到盐胁迫的抑制。四倍体的死亡率均低于二倍体；HN2026-4x（12.3%）和Nipponbare-4x（12.6%）的死亡率较低，表现出较好的耐盐性。不同四倍体水稻品种游离脯氨酸含量差异较大，均较二倍体品种有所增加。盐胁迫下可溶性糖含量在四倍体和二倍体品种间差异不显著。盐胁迫下四倍体水稻叶片丙二醛积累量显著低于二倍体品种，盐胁迫下日本裸4x的丙二醛含量最低（55.3 μ mol g-1），表明膜损伤最小。
Polyploidy was widely believed to facilitate increased plant adaptability to environmental extremes. Reports of the effect of genome duplication on rice development under salt stress are rare. In this study, tetraploid rice cultivars and the diploid ancestors were subjected to six levels of salinity, and the effects of genome duplication at seed germination and at the seedling growth stage were investigated. The results suggest salt stress has a large negative impact at both stages but genome duplication has important positive roles in modulating the response to salt stress in different rice cultivars. The germination rate of four tetraploid rice cultivars was generally higher than those of diploid cultivars under salt stress; in particular, cultivars Nipponbare-4x and HN2026-4x have >50% of the germination rate in 150 mM NaCl. The growth of all diploid and tetraploid cultivars studied was inhibited by salt stress. The mortality rates of tetraploids were all lower than those of diploids; the low mortality of HN2026-4x (12.3%) and Nipponbare-4x (12.6%) showed potentially better salt tolerance. The amount of free proline in different tetraploid rice cultivars varied greatly and was increased compared to that in the diploid cultivars. The difference of soluble sugar content under salt stress, was not significant between tetraploid and diploid cultivars. Malonyldialdehyde accumulated in the leaves of tetraploid rice was significantly lower than that of diploid cultivars under salt stress, the content of MDA in Nipponbare-4x (55.3 mumol g-1) under salt stress was the lowest among all cultivars, indicating membrane damage was the least.
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影响因子：
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作者：
F. Ahmad;M. A. Khan;Mushtaq Ahmad;M. Zafar;A. Nazir;S. K. Marwat
通讯作者：
F. Ahmad;M. A. Khan;Mushtaq Ahmad;M. Zafar;A. Nazir;S. K. Marwat
影响因子：
11.6
作者：
Xiong, LZ;Yang, YN
通讯作者：
Yang, YN
影响因子：
6.9
作者：
Kanlaya Kong-ngern;S. Daduang;C. Wongkham;S. Bunnag;M. Kosittrakun;P. Theerakulpisut
通讯作者：
Kanlaya Kong-ngern;S. Daduang;C. Wongkham;S. Bunnag;M. Kosittrakun;P. Theerakulpisut
影响因子：
2.9
作者：
Kawaura, Kanako;Mochida, Keiichi;Ogihara, Yasunari
通讯作者：
Ogihara, Yasunari
影响因子：
--
作者：
M. Shahid;M. A. Pervez;R. Balal;T. Abbas;C. M. Ayyub;N. Mattson;A. Riaz;Z. Iqbal
通讯作者：
M. Shahid;M. A. Pervez;R. Balal;T. Abbas;C. M. Ayyub;N. Mattson;A. Riaz;Z. Iqbal