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中国农学通报

中国农学通报 ›› 2010, Vol. 26 ›› Issue (8): 149-156.

所属专题： 生物技术； 水稻； 农业气象

• 农学 农业基础科学 • 上一篇    下一篇

PEG-6000模拟干旱对水稻苗期根系形态和部分生理指标影响的研究

马廷臣1,2,3,余蓉蓉3,陈荣军3,曾汉来2,张端品2   

  • 收稿日期:2009-10-23 修回日期:2009-12-25 出版日期:2010-04-20 发布日期:2010-04-20
  • 基金资助:

    国家自然科学基金项目

Study on Effect of Drought Stress with PEG-6000 on Root Morphology and Some Physiological Indices in Rice Seedling

Ma Tingchen1,2,3, Yu Rongrong3, Chen Rongjun3, Zeng Hanlai2, Zhang Duanpin2   

  • Received:2009-10-23 Revised:2009-12-25 Online:2010-04-20 Published:2010-04-20

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摘要：

本文研究了不同PEG浓度处理对2个不同抗逆性的水稻品种根体积、根粗、最长根长3个形态指标和SOD活性、MDA含量、Pro含量、根系活力4个生理指标的影响，结果如下：耐旱品种和敏感品种根部的形态指标都受严重干旱（T3处理）抑制，敏感品种更为明显；形态指标在T0、T1、T2、T3处理下随着处理时间的增加而增大，不同浓度处理之间一般处理3－4天后才会产生明显差异；CAT活性和SOD活性随处理浓度增加而增大，随处理时间延长，抗旱品种SOD的活性增加的速度快于敏感的品种，下降的速度慢于敏感品种；MDA含量和Pro含量随着处理浓度升高而增加，随处理时间增加而增大，敏感品种高于耐旱品种，作为抗旱选择指标并不合适，作为胁迫敏感指标更合适；根系活力随处理时间增加而增大，其最适的处理浓度为T1；相关分析表明根系活力与形态指标正相关极显著，根粗、CAT活性和SOD活性与MDA含量和Pro含量负相关显著或极显著，MDA含量和Pro为极显著的正相关关系，CAT活性和SOD活性也为极显著的正相关关系。

关键词: 柑橘, 柑橘, 植物生长调节剂, 茎段培养, 生根培养

Abstract:

Two different drought resistant varieties have been treated by PEG-6000 grades(T0,T1,T2,T3) in rice seedling. Their morphology and physiological indices are surveyed and concluded as followed: The morphology indices of 2 varieties are restrained by strictness drought(T3 treatment) and the sensitive one is more effective than the resistant one. The morphology indices augment with treatment time prolonging by all PEG-6000 grades and their difference appear after 3-4 days. CAT and SOD activity augment with treatment time prolonging and PEG-6000 concentration increasing. The resistant one augments faster than the sensitive one and descends slower than the sensitive variety. MDA and Pro content augment with treatment time prolonging and PEG-6000 concentration increasing. The effect of the sensitive variety is stronger than the resistant one. So they are not adapted to be drought resistant indices. Root activity augments with treatment time prolonging. The consistent with or coincide with or et al optimum treatment is T1. Correlation analysis showed that there were very significantly positive correlations between root activity and morphology indices, and significantly or very significantly negative correlations between root diameter, CAT activity, SOD activity and MDA content, praline content. MDA content was very significantly positively related to praline content, CAT activity was very significantly positive correlation to SOD activity.