| 田蕾，王娜，张雪艳，杨斌林，孙佳莹，李敏，李培富.盐胁迫下不同粳稻品种的形态和生理特性[J].广东农业科学,2014,41(23):1-6 |
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盐胁迫下不同粳稻品种的形态和生理特性 |
| Morphological and physiological characteristics of different japonica rice varieties under salt stress |
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| DOI： |
| 中文关键词: 水稻 苗期耐盐性 耐盐级别 叶片伤害率 丙二醛含量 |
| 英文关键词: rice salt tolerance at seedling stage salt tolerance score leaf damage percentage content of MDA |
| 基金项目:宁夏自然科学基金（NZ12120）；国家自然科学基金（31401361） |
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| 中文摘要: |
| 用国际水稻所标准营养液培养60个粳稻品种，发芽14d后加入125 mmol/L NaCl 胁迫处理，于盐胁迫后第3、6 d分别取样测定叶片伤害率、叶片丙二醛含量；叶片盐害症状明显时（盐胁迫6 d后），根据盐害症状评价水稻耐盐级别，分别测定株高、地上部和根的干鲜重等耐盐相关生理指标。结果表明，叶片伤害率、叶片丙二醛含量等生理指标均与耐盐级别呈极显著负相关，耐盐品种的相对干鲜重极显著高于盐敏感品种，而叶片伤害率、盐胁迫6d后叶片丙二醛含量则均极显著低于盐敏感品种；利用耐盐级别将各品种分为耐盐组（T）、中间组（M）和盐敏感组（S）3组，3 组品种盐胁迫3 d 叶片丙二醛含量差异不显著，而耐盐组（T）的叶片伤害率（盐处理3、6 d），盐胁迫6 d 叶片丙二醛含量均极显著低于盐敏感组（S）和中间组（M），且在分布范围上与盐敏感组没有重叠部分。表明这两个指标能有效区分苗期耐盐和盐敏感水稻品种，可作为定量生理指标评价水稻苗期耐盐性，为水稻种质资源苗期耐盐鉴定，耐盐基因发掘和品种培育奠定了基础。 |
| 英文摘要: |
| Soil salinity is recognized as one of the major abiotic stresses negetively affecting crop productivity worldwide. In this study, 60 japonica rice varieties were grown in IRRI standard nutrient solution, in which 125 mmol/L NaCl was added 14 days after germination. In the third and sixth days after salt stress treatment, the leaf damage percentage and MDA content were measured. The visual foliar symptom was used to evaluate the scale of the salt tolerance at the sixth day after salt treatment, and then plant height, shoot fresh and dry weight, root fresh and dry weight were measured. The results showed that the leaf damage percentage, MDA content and other physiological traits were significantly negatively correlated with salt tolerance score. The relative fresh and dry weight of the tolerant cultivars were significantly higher than those of the sensitive cultivars, while the leaf damage percentage and leaf MDA content measured after stress for six days of the tolerant cultivars were significantly lower than those of the sensitive cultivars. According to the salt tolerance score, these 60 japonica rice varieties were divided into three groups. The MDA content of leaves measured after stress for three days had no significantly differance among these 3 groups. The leaf damage percentage and leaf MDA content measured after stress for six days of salt tolerance group (T) were significantly lower than the saltsensitive group (S) and intermediate group (M) and there was no overlap in the distribution range between those of saltsensitive group and salt tolerance group. The results indicated that the leaf damage percentage and leaf MDA content measured after stress for six days could be used for the evaluation of salt tolerance in cultivated rice at the seedling stage.Therefore, the method of evaluating salt tolerant rice cultivars at the seedling stage by these two physiological traits in hydroponics will be used in germplasm identification, gene cloning and cultivar development of salt tolerance in rice. |
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