摘要
【目的】探讨菊芋幼苗耐碱性与生物量和可溶性渗透物质在不同器官分配积累的关系。【方法】采用营养液砂培试验,以2个耐碱程度不同的菊芋品种‘南芋8号’(Ht1,耐碱)和‘南芋1号’(Ht2,耐碱性较弱)为材料,设置0.0、12.5、25.0以及37.5mmol·L-1Na2CO3溶液模拟碱胁迫,研究其幼苗不同器官生物量分配和可溶性渗透物质含量的变化。【结果】碱胁迫下,2种菊芋幼苗各器官生物量比、Na+含量、K+含量、可溶性糖以及脯氨酸含量存在较大差异。相比之下,Ht1在低碱胁迫(12.5mmol·L-1)时叶片保持了较高的K+含量,根系积累了较多的干物质;较高碱胁迫(25.0,37.5mmol·L-1)时叶片和根系积累了较多的可溶性糖,根系保持了较高的K+含量和较低的Na+含量,而Ht2根系Na+含量、各器官脯氨酸含量以及茎可溶性糖含量在所有设定碱浓度下均较高。【结论】菊芋幼苗品种间耐碱性差异与其不同器官生物量和可溶性渗透物质的分配积累有关。耐碱菊芋品种低碱胁迫时叶片保持了较高的K+含量,根系分配了较多的干物质,较高碱胁迫时叶片和根系保持了较高的可溶性糖含量,根系保持了较高的K+含量和较低的Na+含量,这可能是其耐碱性较强的重要原因之一。
【Objective】The objective of this paper is to investigate the relationship between the tolerance of two Helianthus tuberosus L. genotypes to alkaline stress and the allocation of biomass and soluble osmoticum in different organs.【Method】With sandy culture in greenhouse,two Helianthus tuberosus L. genotypes Nanyu 8 （Ht 1, alkaline-tolerant） and Nanyu 1 （Ht 2, lower alkaline-tolerant） were exposed to 1/2 strength Hoagland’s nutrient solution with Na2CO3 added （0.0, 12.5, 25.0, 37.5mmol·L^-1）, and the biomass and osmoticum in different organs （leaf, stem and root） were determined.【Result】Under alkaline stress, there were considerable differences in the allocation of biomass and osmoticum （Na^＋, K^＋, soluble sugar, proline） between two genotypes. Comparatively it can be found that, Ht 1presented higher K^＋ content in leaf and more biomass in root under lower alkaline stress （12.5 mmol·L^-1）, and higher contents of soluble sugar in leaf and root and also higher K^＋ but lower Na^＋ content in root under higher alkaline stress （25.0, 37.5 mmol·L^-1）, while Ht 2 higher Na^＋ content in root, higher content of soluble sugar in stem and also higher proline content in all organs. 【Conclusion】The results indicated that the allocation of biomass and soluble osmoticum in plant organs were involved in alkaline tolerance of the seedlings of Helianthus tuberosus L. genotypes. For Ht 1, there were higher K^＋ content in leaf and more biomass invested in root under lower alkaline stress, higher soluble sugar content in leaf and root, and also higher K^＋ but lower Na^＋ content in root under higher alkaline stress, which can partly ascribe to its higher alkaline tolerance.
出处
《中国农业科学》
CAS
CSCD
北大核心
2008年第3期901-909,共9页
Scientia Agricultura Sinica
基金
国家“863”海洋计划主题项目(2003AA627040)
江苏省自然科学基金项目(BK2003201)
江苏省“十五”农业科技攻关课题(BE2013370)
关键词
碱胁迫
菊芋
品种
生物量分配
可溶性渗透物质
Alkaline stress
Helianthus tuberosus L.
Genotypes
Biomass allocation
Soluble osmoticum
