苗木蒸腾和Na+吸收对切根及NaCl处理的响应
Response of Transpira tion and Na+ Intake of Seedlingto Cutting Root and NaCl Trea tments
-
摘要: 盐碱地造林时根系伤口对盐分吸收有无影响至今未见报道。本研究在150 mmol NaCl处理的水培条件下,切断供试苗木的吸收根,通过检测叶被害率、蒸腾速率及苗木根、枝干和叶中Na+含量,进一步阐明蒸腾和Na+吸收对切根及NaCl处理的响应。试验结果表明: (1)青栲和金木犀两树种的切根处理都使Na+含量和含有率增大,导致叶被害率升高; (2)与对照及不切根做NaCl处理及切根后3 d做NaCl处理相比,切根后立即进行NaCl处理的苗木,Na+的吸收显著增多,苗木盐害最重,蒸腾速率降低的幅度也最大;切根后放置3 d,Na+吸收和盐害明显受到抑制;(3)随着蒸腾速率的增大,青栲和金木樨的Na+吸收量都增加,且金木樨的二者的相关关系呈极显著( r = 0. 613**,n = 18) 。这为盐碱地造林措施的改进提供了理论依据,即在盐碱地造林时最好采用不需要修剪根系的苗木,如果确有修剪的必要,也要在修剪并经过几天圃地的假植后再行种植,避免盐分被迅速吸收,使苗木遭受盐害。Abstract: There were no report on whether cutting root influence salinity intake in afforestation in saline-alkali soils.To further examine the response of transp iration and Na+ intake of seedling to cutting root and NaCl treatment, itwastested to leaf damage rate, transp iration rate and Na+ content in the root, branches and leaves, by cutting absorption root of the seedling of Cyclobalanopsis m y rsinaefolia and Osm anthus fragrans var. auran tiacus under the condition of 150 mmol NaCl treatment. The results showed: (1) Cutting root treatments of both C. m yrsinaefolia and O.fragrans var. auran tiacus resulted in the increase ofNa+ content and its content ratio, which leaded to the increasement of leaf damage rate. (2) If NaCl treatmentswere immediately done after cutting root, itwas significant to increase Na+ up take, caused serious salinity p roblems, and largest range of decrease of transp iration rate. In contrast,if NaCl treatmentswere done on 3 days after cutting root, Na+ intake and salinity p roblems were obviously inhibi2ted. (3) Na+ up take increased with the increase of transp iration rate in C. m y rsinaefolia and O. frag rans, and therewas a significant positive correlation ( r = 0. 613**, n = 18) between Na+ up take and transp iration rate for O. fragrans. All these suggested that it was not feasible for afforestation in saline2alkali soils to cutting root of seedling,however, if itmust be cut, it was necessary to heeling-in for a few days in the garden to p revent salinity p roblem from the rap id up take of salinity.
-
Key words:
- NaCl treatment
- / cutting root
- / seedling
- / transp iration rate
- / Na+ content
-
[1] 何龙飞,刘友良,沈振国,等. 植物离子通道特征、功能、调节与分子生物学[J]. 植物学通报, 1999, 16 (5) : 517 - 525 [C]. 日本林学会論文集, 1997, 108: 297 - 298 [3] 土屋幹夫. 塩分? ¨ ì ?下の作物の生理[J]. 遺伝, 1993, 47:82 - 87 [4] 重永英年, 石田厚, 上村章,等. NaCl処理を行ったˉ ??? 苗木の塩集積特性[M]. 第107回日林講要, 1996: 126 [5] 土屋幹夫,内藤整,江原宏,等. 塩分濃度に対する? - の生理反応に関する研究—第一報. 蒸散とNaの吸収移行の関係について[J]. 日作紀, 1992, 61: 16 - 21 [6] 小畑 仁,茅野充男. 個体における水と? ? ó [M] / /茅野充男. 物質の輸送と貯蔵—現代植物生理学5. 東京: 朝倉書店,1994 : 61 - 88 [7] Dalton F N, Raats P A C, GardnerW R. Simultaneous up take ofwater and solutes by palnt roots[J]. Agronomy Journal, 1975, 67:334 - 339 [8] Naito H, TsuchiyaM, Kumano S. Physiological response to salinityin rice p lant II. Relationship of sodium exclusion to transp iration androot-resp iration rate in NaCl-stress conditions [J]. Jpn J Crop Sci,1994, 63: 320 - 325 [9] TsuchiyaM, MiyakeM, Naito H. Physiological response to salinityin rice p lant III. A possiblemechanism forNa+ exclusion in rice rootunderNaCl-stress conditions[J]. Jpn J Crop Sci, 1994, 63: 326 -332 [10] 内藤整, 土屋幹夫, 熊野誠一. 高NaCl濃度下における? - のNa吸収と蒸散速度および根部呼吸速度との関係[J]. 日本作物記事, 1993, 62: 138 - 139 [11] 姜国斌,矢幡久. 樹木の耐塩性のá ? ?? à に関する研究-苗木の塩吸収量に及ぼす蒸散の影響 [12] TakagiM, J iang G B, Yahata H. Apop lastic pathways of tree species roots identified by fluorescent dye[J]. Bull Inst Trop Agr Kyushu Univ, 1998, 21: 43 - 47 [13] Walker R R. Sodium exclusion and potassium-sodium selectivity insalt tri-foliate orange ( Poncirus trifolilata) and Cleopatra mandarin(Citrus reticulata) p lants [J]. Aust J Plant Physiol, 1986, 13:293 - 303 -
点击查看大图
计量
- 文章访问数: 3224
- HTML全文浏览量: 180
- PDF下载量: 1398
- 被引次数: 0
下载:
