HUANG Yi-ting,GUO Peng,XUE Han-jie.Effect of Salt Stress on Root Morphological Characteristics and Leaf Water Use Efficiency in Alfalfa[J].HEILONGJIANG AGRICULTURAL SCIENCES,2016,(04):114-120.[doi:10.11942/j.issn1002-2767.2016.04.0114]
盐胁迫对紫花苜蓿根系形态特征和水分利用效率的影响
- Title:
- Effect of Salt Stress on Root Morphological Characteristics and Leaf Water Use Efficiency in Alfalfa
- 文章编号:
- 1002-2767（2016）04-0114-06
- Keywords:
- alfalfa (Medicago sativa); root; salt stress; WUE
- 分类号:
- S551+.7
- 文献标志码:
- A
- 摘要:
- 为提高紫花苜蓿的耐盐能力，分别采用盆栽试验和田间试验，利用Delta-t scan根系分析软件对不同盐处理下紫花苜蓿根总面积、根总长度、平均直径和根尖数进行分析。结果表明：在田间试验条件下，在低度盐浓度胁迫下，无论不同土壤深度还是全株根系分析过程中，只有平均直径略有所下降，其它各根系形态指标均呈上升趋势。中度盐胁迫下，根系的平均直径和根总长度显著低于轻度盐处理，但还高于对照。重度盐胁迫下，各根系指标均低于对照。但在盆栽试验下，随着盐胁迫的加重，各根系指标均呈下降趋势。另外在轻度盐胁迫下发现叶片通过降低Tr和提高WUE的方式减少水分的损失，提高植物的耐盐性，但随着盐胁迫的加重，WUE逐渐下降。总之盐胁迫下紫花苜蓿根面积、根长度、根尖数、根平均半径等形态上的变化虽然趋势不一,但彼此相互协调一方面维系了根系的吸水功能进而提高对盐胁迫的一种适应性反应。
- Abstract:
- In order to improve the ability of salt tolerance of alfalfa, the field and pot experiment were carried on ,the total area,total length,average diameter and tips number of alfalfa roots under different concentration of salt stress were analyzed with the root analysis software of Delta-t scan.The results showed that in the field experiment,all the roots morphological indexes increased in different deep and the whole roots,only except the root average diameter.Under moderate salt stress,the total length and average diameter of root were significantly lower than that in low salt stress,but still higher than that of the control.Under severe salt stress,all the root indexes were lower than the control,but in the pot experiment,all the root indexes showed a downward trend with the increasing salt stress.In addition,under low salt stress,found that the decreasing Tr and increasing WUE mode reduce the loss of water and improve plant salt tolerance,but with the increase of salt stress,WUE decreased.In short,under salt stress，the change of alfalfa root area,root length,root number,root average diameter were not consistent,but they harmonized each other to maintain the water absorption capacity and improved the adaptive reaction to salt stress.
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备注/Memo
收稿日期：2016-02-20