NaCl胁迫下平欧杂种榛幼苗生物量和离子积累与分配特征  

Accumulation and Allocation Characteristics of Biomass and Salt Ion of Corylus heterophylla X Corylus avellana Seedlings Under NaCl Stress

作　　者：罗达[1] 宋锋惠[1] 史彦江[1] LUO Da;SONG Fenghui;SHI Yanjiang(Institute of Economic Forests,Xinjiang Academy of Forestry Science,Urumqi,Xinjiang 830063)

机构地区：[1]新疆林业科学院经济林研究所,新疆乌鲁木齐830063

出　　处：《北方园艺》2023年第19期22-28,共7页Northern Horticulture

基　　金：国家自然科学基金资助项目(31960324);新疆自然科学基金资助项目(2022D01A62);新疆“天山英才”计划资助项目(XJTSYC-343)。

摘　　要：以二年生平欧杂种榛幼苗为试材,采用盆栽控盐法,研究了不同浓度NaCl胁迫(0、50、100、200 mmol·L^(-1))对植株不同组织生物量和盐离子积累与分配特征的影响,以期明确平欧杂种榛对盐胁迫的响应与适应机制。结果表明:NaCl胁迫后,幼苗根、茎、叶、冠以及整株生物量积累显著下降,但根冠比显著提高。不同浓度NaCl胁迫下,植株生物量分配至根中最多(75.75%),其次为茎(8.34%),叶最少(15.91%)。随着NaCl浓度的升高,不同组织Na^(+)含量均呈大幅增加的趋势,其中,50、100 mmol·L^(-1)和200 mmol·L^(-1)NaCl胁迫下根Na^(+)含量较对照分别显著增加1.12、2.08倍和4.22倍。Na^(+)含量表现为叶(18.46 mg·g^(-1))>茎(2.58 mg·g^(-1))>根(1.77 mg·g^(-1))。随着NaCl浓度的升高,不同组织Na^(+)净积累和相对净积累的变化趋势不尽相同。Na^(+)净积累与相对净积累则表现为叶(70.99 mg·株^(-1)和68.53%)>根(28.03 mg·株^(-1)和26.97%)>茎(4.60 mg·株^(-1)和4.50%)。综合分析表明,盐胁迫下平欧杂种榛通过将大比例生物量分配至根系的方式提高根冠比;同时,根系将吸收的过量Na^(+)转运至叶片,使叶片最终成为Na^(+)的主要贮存库,一方面减弱Na^(+)对根系的毒害,另一方面增强地上与地下部分之间的渗透势差,进而维持正常的生理功能。平欧杂种榛具有一定的耐盐性,可作为生态经济型树种在新疆盐碱地区合理开发利用。Two-year-old seedlings of Corylus heterophylla X Corylus avellana were selected as test materials.The seedlings were treated with different NaCl concentrations(0,50,100,200 mmol.L^(-1))in a pot salt experiment,Subsequently,the effects of NaCl stress on the accumulation and allocation characteristics of biomass and salt ion in different tissues were studied,in order to definite the response and adaptive mechanism of C.heterophylla X C.avellana to salt stress.The results showed that after NaCl stress,the biomass accumulation of roots,stems,leaves,shoots and the whole plant all decreased significantly,while the root-shoot ratio increased significantly.Under different NaCl stress,plant biomass was allocated to the root most(75.75%),followed by the stem(8.34%),and the leaf least(15.91%).With the increase of NaCl concentration,the Na^(+)content in different tissues showed a significant increase trend.Under 50,100 mmol·L^(-1)and 200 mmol·L^(-1)NaCl stress,the Na^(+)content in roots increased 1.12,2.08 times and 4.22 times,respectively,compared with the control.The Na^(+)content showed that leaves(18.46 mg·g^(-1))>stems(2.58 mg:g^(-1))>roots(1.77 mg:g^(-1)).With the increase of NaCl concentration,the changes of net accumulation and relative net accumulation of Na^(+)in different tissues was different.The net Na^(+)accumulation and relative net accumulation showed that leaves(70.99 mg·plant^(-1)and 68.53%)>roots(28.03 mg·plant^(-1)and 26.97%)>stems(4.60 mg·plant^(-1)and 4.50%).In conclusion,our findings suggested that,C.heterophylla X C.avellana could improve the root-shoot ratio by allocating a large proportion of biomass to the root under salt stress.At the same time,the root transports the absorbed excess Na^(+)to the leaves,and finally become the main storage tissue of Na^(+).On the one hand,it reduced the Na^(+)toxicity in the root,on the other hand,it enhanced the osmotic potential difference between the aboveground and underground,thus maintaining normal physiological functions.C.heterophylla X C.avellana had

关 键 词：NACL胁迫 Na^(+) 净积累 分配 平欧杂种榛 

分 类 号：S664.4[农业科学—果树学]