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当前位置: 首页 > 文章 > 低盐胁迫对5个海水稻种质若干生理生化指标的影响 热带农业科学 2018 (8) 24-29
Position: Home > Articles > Effect of Low Salt Stress on Several Physiological and Biochemical Indicators of Five Accessions of Sea Rice Chinese Journal of Tropical Agriculture 2018 (8) 24-29

低盐胁迫对5个海水稻种质若干生理生化指标的影响

作  者：
王旭明;赵夏夏;陈景阳;李震;陈佳媚;许江环;周鸿凯
关键词：
海水稻;低盐胁迫;耐盐性;生理生化特性
摘  要：
以HH11、R15A14、Pokkali、FL478、 IR29为材料,设0、2.5 g/kg NaCl两种盐胁迫处理进行盆栽试验,研究不同盐浓度对水稻叶片的光合速率、叶绿素含量、游离脯氨酸含量、丙二醛含量、细胞膜透性以及农艺性状的影响。结果表明:在低盐胁迫条件下,HH11、R15A14与耐盐基因型(Pokkali和FL478)和盐敏感基因型(IR29)水稻相比:⑴5个海水稻叶绿素含量没有显著性差异,但是HH11低于pokkali而高于FL478耐盐品种;海水稻在低盐胁迫下光合速率变化较小,并且维持在较高水平;⑵不同海水稻体内的游离脯氨酸维持在较高水平,而HH11游离脯氨酸含量达到最大值;⑶HH11、R15A14和FL478丙二醛含量相近;相比其他种质,R15A14和Pokkali细胞膜透破坏程度相对较小,细胞膜透性仍处于稳定状态;⑷低盐胁迫下植株细胞聚集大量的丙二醛,细胞膜透性受伤害程度加剧,从而造成光合速率下降;而脯氨酸作为小分子渗透调节物质,以缓解细胞渗透压,维持细胞膜结构稳定,从而维持水稻植株叶片可以进行正常光合速率,植株保持正常生命活动;⑸HH11和R15A14这2份海水稻种质在盐胁迫下仍能进行正常生长并且具有显著抗盐胁迫能力,表现了较好的耐盐碱性,可作为耐盐碱籼稻资源加以利用。
译  名：
Effect of Low Salt Stress on Several Physiological and Biochemical Indicators of Five Accessions of Sea Rice
作  者：
WANG Xuming;ZHAO Xiaxia;CHENG Jingyang;LI Zheng;CHENG Jiamei;XU Jianghuan;ZHOU Hongkai;College of Agriculture, Guangdong Ocean University;
单  位：
WANG Xuming%ZHAO Xiaxia%CHENG Jingyang%LI Zheng%CHENG Jiamei%XU Jianghuan%ZHOU Hongkai%College of Agriculture, Guangdong Ocean University
关键词：
sea rice;;low salt stress;;salt tolerance;;physiological and biochemical characteristics
摘  要：
The rice accessions HH11, R15 A14, Pokkali, FL478 and IR29 were pot cultured and treated with 0 or 2.5 g/kg of NaCl(stress of low salt) to observe their photosynthetic rate, chlorophyll content, free proline content, malondialdehyde content, cell membrane permeability and agronomic traits in rice leaves. The rice accessions HH11 and R15 A14 were compared with the salt-tolerant genotypes(Pokkali and FL478) and salt-sensitive genotype(IR29) of the rice accessions under the stress of low salt. The results showed that all the five accessions of the sea rice were not significantly different in chlorophyll content. The HH11 was lower in chlorophyll content than the Pokkali but higher than the salt-tolerant accession FL478. All the accessions of sea rice had a high photosynthetic rate with little change. The accessions of sea rice all maintained a high free proline content but HH11 was maximum in free proline content. The HH11, R15 A14 and FL478 were similar in malondialdehyde content. Compared with other accessions, Pokkali and R15 A14 were relatively less injured in their cell membrane and had stable cell membrane permeability. The sea rice plants under low salt treatment accumulated a large amount of malondialdehyde in their cells, which increased the injury of cell membrane permeability and hence decreased their photosynthetic rate. Proline was used as a low-molecular-weight material to relieve cell osmotic pressure and stabilize cell membrane structure for the normal photosynthetic rate of the leaves and the life of the plants. The HH11 and R15 A14 were still able to grow normal under the salt stress and had significant saline-alkaline resistance. They could be used as salt-tolerant resources of Japonica rice.

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