DCPTA对盐胁迫下玉米苗期根系生长、渗透调节及膜透性的影响

生态学杂志

DCPTA对盐胁迫下玉米苗期根系生长、渗透调节及膜透性的影响

张翯^1,2,顾万荣^1,2,王泳超¹,李丽杰¹,曾繁星¹,杨振芳¹,杨德光^1,2,魏湜^1,2**

（¹东北农业大学农学院，哈尔滨 150030； ²农业部东北地区作物栽培科学观测实验站，哈尔滨 150030）

出版日期:2015-09-10 发布日期:2015-09-10

Effects of DCPTA on root growth, osmotic adjustment and cell membrane permeability of maize seedlings under salt stress.

ZHANG He^1,2, GU Wan-rong^1,2, WANG Yong-chao¹, LI Li-jie¹, ZENG Fan-xing¹, YANG Zhen-fang¹, YANG De-guang^1,2, WEI Shi^1,2**

(¹College of Agronomy, Northeast Agricultural University, Harbin 150030, China; ²The Observation Experiment Station of the Ministry of Agriculture for Crop Cultivation Science in Northeast Area, Harbin 150030, China)

Online:2015-09-10 Published:2015-09-10

摘要/Abstract

摘要： 黑龙江省西部地区盐碱土面积约有66.7×10⁴ hm²，制约着黑龙江省粮食生产水平的进一步提高。叔胺类活性物质2-(3,4-二氯苯氧基)-乙基-二乙胺（DCPTA）具有提高作物抗逆性作用，为探讨DCPTA提高玉米耐盐性机制，采用营养液水培试验，在前期试验基础之上，选取“先玉335”（耐盐性强）和“丰禾1号”（耐盐性弱）2个品种，研究DCPTA(15 mg·L^-1)对NaCl胁迫下（150 mmol·L^-1）玉米幼苗根系生长、渗透调节及质膜透性的影响。结果表明：DCPTA能增加盐胁迫下幼苗的根长、根表面积、根体积、根鲜重和根干重，缓解盐胁迫对根系生长的抑制；DCPTA维持了根系水分平衡，提高了盐胁迫下幼苗根系相对含水量，“先玉335”和“丰禾1号”分别提高3.6%和6.4%；DCPTA通过提高根系可溶性糖含量和可溶性蛋白含量，降低幼苗根系脯氨酸含量，增强了盐胁迫下玉米幼苗根系的渗透调节能力，并通过降低根系丙二醛（MDA）含量和相对电导率，保护了根系质膜结构和功能；与盐胁迫相比，“先玉335”丙二醛含量和相对电导率分别降低21.6%和24.2%，“丰禾1号”分别降低28.1%和30.4%；DCPTA缓解盐胁迫对根系伤害的效果表现为“丰禾1号”＞“先玉335”。

关键词: 系统发育树, 天童, 样地, 森林动态

Abstract: The salinealkali land area is about 667000 hm² in the western Heilongjiang Province, and the salinealkali soil restricts the further enhancement of food production level in the province. The diethylaminoethyl3,4dichlorophrylether (DCPTA) is one of tertiary amines active substances, playing an important role in improving crop resistance. The objective of this study was to investigate the mechanism of maize salt tolerance enhanced by DCPTA. A hydroponic experiment was performed with ‘Xianyu 335’ (salttolerant) and ‘Fenghe No. 1’ (saltsensitive) to investigate the effects of DCPTA (15 mg·L^-1) on root growth, osmotic adjustment and cell membrane permeability of maize seedlings under salt stress (150 mmol·L^-1). The results showed that exogenous DCPTA application led to a marked increase in root length, root surface, root volume, root fresh weight and root dry weight of seedlings, alleviating growth inhibition under salt stress. In comparison with salt stress, DCPTA could maintain the water balance of roots and improved the relative water contents of ‘Xianyu 335’ and ‘Fenghe No. 1’ seedlings by 3.6% and 6.4%, respectively. DCPTA enhanced the osmotic adjustment ability of maize seedling roots by increasing soluble sugar and soluble protein and decreasing proline content. The exogenous DCPTA may play an important role in stabilizing root plasma membrane structure and function. The malondialdehyde (MDA) content and relative conductivity of ‘Xianyu 335’ and ‘Fenghe No. 1’ under DCPTA pretreatment were decreased by 21.6% and 24.2%, and 28.1% and 30.4%, respectively. The mitigating effects of DCPTA on root damage by salt stress of ‘Fenghe No. 1’ were greater than those of ‘Xianyu 335’.

Key words: Tiantong, forest dynamic plot, phylogenetic structure

张翯1,2,顾万荣1,2,王泳超1,李丽杰1,曾繁星1,杨振芳1,杨德光1,2,魏湜1,2**. DCPTA对盐胁迫下玉米苗期根系生长、渗透调节及膜透性的影响[J]. 生态学杂志.

ZHANG He1,2, GU Wan-rong1,2, WANG Yong-chao1, LI Li-jie1, ZENG Fan-xing1, YANG Zhen-fang1, YANG De-guang1,2, WEI Shi1,2**. Effects of DCPTA on root growth, osmotic adjustment and cell membrane permeability of maize seedlings under salt stress.[J]. cje.

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