共查询到20条相似文献，搜索用时 187 毫秒
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绢毛匍匐委陵菜(Potentilla reptans var.sericophyll)是品质优良的园林地被植物,但目前其繁殖方法不能适应生产需求,发掘新的繁殖方式迫在眉睫。笔者使用撒茎覆土法种植绢毛匍匐委陵菜茎段,施用3种不同配比的N,P,K复合肥,结果表明:N,P,K配比为1∶1∶2时,最有利于绢毛匍匐委陵菜茎段繁殖,其成活率可达到96%;70 d后盖度达89%,分株数428株/m~2,匍匐茎数80条/m~2;生物量积累较多,其中,地上部分为0.010 7 g/cm~2,地下部分为0.003 4 g/cm~2;叶绿素含量较高,达到2.67 mg/g.因此,采用撒茎覆土法,施用N,P,K配比为1∶1∶2的复合肥,不仅可以适应大田生产,而且能够提高绢毛匍匐委陵菜的成坪质量。 相似文献
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对毛豹皮樟4个品种在人为水涝胁迫下测定其叶片的可溶性蛋白、丙二醛(MDA)、可溶性糖、SOD、叶绿素含量,结果表明:涝害处理对SOD有显著影响,对叶绿素有极显著影响;品种对SOD有显著影响,对MDA有极显著影响;涝害和品种对可溶性糖与可溶性蛋白均没有显著影响,而对SOD则有显著影响。经主成分分析SOD与耐涝性有较好的相关性(R2=0.99563),SOD对毛豹皮樟耐涝性评价经检验精度都在98%以上。因此SOD可以作为毛豹皮樟耐涝性评价指标。 相似文献
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城市园林植物的耐涝性筛选及其合理应用,对海绵城市设施功能的实现作用显著。本研究选取华南地区22种园林植物,通过水淹胁迫(0、5、10和15d)试验,观测其叶绿素相对含量、丙二醛(MDA)含量、过氧化物酶活性(POD)活性的变化,运用隶属函数和主成分分析法,综合评价其耐涝性。结果表明,对22种植物的耐涝性综合评价值的聚类分析可划分为3个抗逆级别,分别为Ⅰ级耐涝植物:中华天胡荽Hydrocotyle chinensis、风车草Cyperus involucratus、黄蝉Allamanda schottii、鸢尾Ⅰris tectorum、鹅掌柴Schefflera heptaphylla、蓝花草Ruellia simplex、栀子Gardenia jasminoides;Ⅱ级一般较耐涝植物:茉莉花Jasminum sambac、红鳞蒲桃Syzygium hancei、基及树Carmona microphylla、米仔兰Aglaia odorata、四季桂Osmanthus fragrans var. semperflorens、灰莉Fagraea ceilanica、紫薇Lagerstr... 相似文献
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木兰科植物兼具观赏、药用、材用、生态和科研价值，文化内涵深远，适应范围广，几乎涵盖整个中国，可作为建设低碳生态园林城市的重要植物材料，但相对较差的抗逆性成为制约其园林应用推广的最大瓶颈。为发掘耐涝性种质资源，研究人员根据淹水胁迫过程中木兰科植物的表型变化，选定叶色变化、植株萎蔫情况、茎基部变化和成活率变化4个指标，将其定量分级，制定等级得分标准及评价方案，然后以各指标得分的总和对耐涝性进行综合评价，建立了木兰科植物耐涝性评价体系。研究已对31木兰科种类的2～3年生种播苗进行了耐涝性鉴定，初步筛选出3个耐涝性强的木兰科优异种质。 相似文献
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干旱胁迫对5种园林绿化植物生理生化的影响 总被引：1，自引：0，他引：1
为给抗旱性较强的城市园林绿化植物的筛选提供依据,以5种园林绿化植物蛇莓、蛇莓萎陵菜、东北玉簪、紫萼玉簪和大萼铁线莲为试材,在持续干旱条件下,研究了园林绿化植物的渗透调节和抗氧化酶活性的响应特性。结果表明,持续15d干旱降低了土壤田间持水量,5种植物叶片水势和净光合速率随之下降。但是,蛇莓叶片水势和净光合速率降低的幅度比其它4种植物降低幅度小。干旱胁迫提高了叶片的丙二醛含量,细胞膜脂发生了过氧化。在持续15d干旱过程中,蛇莓和蛇莓萎陵菜叶片SOD活性增强。因此,蛇莓和蛇莓萎陵菜在干旱胁迫下能保持相对较高的光合速率,并利用酶促和非酶促系统清除氧自由基,表现出较强的抗旱能力。 相似文献
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We studied photoprotection and antioxidative protection in the three major species of the Canarian laurel forest (Laurus azorica (Seub.) Franco, Persea indica (L.) K. Spreng and Myrica faya Aiton). Trees were exposed to drought under controlled conditions by withholding water until leaf relative water content (RWC) reached 50-55%. Drought reduced photosynthetic rate (P(N)) and was associated with decreased quantum yield of photosystem II (PSII) electron transport and increased non-photochemical quenching (NPQ) in L. azorica and M. faya, but did not increase NPQ in P. indica. Drought-treated trees of L. azorica had the highest de-epoxidation state (DPS) of the xanthophyll cycle and the highest zeaxanthin (Z) concentration, suggesting that this species had more effective photoprotective mechanisms than M. faya and P. indica. Moreover, beta-carotene remained unaltered in L. azorica trees during drought, suggesting that the chloroplasts of this species are better protected against oxidative stress than those of M. faya and P. indica. Increased antioxidation by ascorbate peroxidase, superoxide dismutase and glutathione reductase in L. azorica removed activated oxygen species (AOS) generated during drought treatment. Although M. faya was able to increase its energy dissipation rate by forming Z and thus increasing the DPS of the xanthophyll cycle, it did not respond to drought-induced oxidative stress with the result that beta-carotene degradation occurred. Persea indica did not activate an energy dissipation mechanism in response to drought treatment, hence formation of AOS was likely high in the drought-treated trees. In general, L. azorica was most resistant and P. indica most sensitive to photoinhibition and oxidative stress during drought. 相似文献
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干旱胁迫对华南地区三种苗木蒸腾耗水的影响 总被引：1，自引：0，他引：1
石灰岩裸露地区土壤普遍具有土层浅薄、保水性差的特征,因此石灰岩地区植物会经常面临干旱胁迫逆境。该研究选择华南石灰岩地区常见的任豆,以及两种石灰岩地区造林供选树种楝叶吴茱萸、车轮梅,通过比较分析这三种植物的盆栽苗木在不同的干旱胁迫程度下的叶片水势、耗水量以及耗水速率,揭示蒸腾耗水规律,为评价植物抗旱性能提供参考依据,同时为在水分亏缺条件下进行造林或者植被恢复提供理论指导。实验结果表明,三种苗木以白天的耗水为主;在不同水分条件下,日总耗水量的大小顺序均为：任豆〉车轮梅〉楝叶吴莱萸正常水分条件下三种苗木的耗水速率日变化趋势呈“单峰”曲线,轻度干旱胁迫时,楝叶吴菜萸和车轮梅的耗水速率日变化趋势则呈“双峰”曲线,其中值得注意的是在干旱胁迫较为严重时,三种苗木的耗水速率受环境温、湿度的影响比较小,在7．9～114．3μmol．m^-1·s^-1之间。综合实际耗水速率的降幅以及重度干旱胁迫下的耗水速率来看,抗旱节水性能大小为：任豆〉车轮梅〉楝叶吴茱萸。 相似文献
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Paper mulberry (Broussonetia papyrifera L. Vent) is well known for its bark fibers, which are used for making paper, cloth, rope, etc. It was found that, in addition to its well-documented role in the enhancement of plant salt tolerance, overexpression of the Na+/H+ antiporter (AtNHX5) gene in paper mulberry plants showed high drought tolerance. After exposure to water deficiency and salt stress, the wild-type (WT) plants all died, while the AtNHX5-overexpressing plants remained alive under high salt stress, and had a higher survival rate (>66%) under drought stress. Measurements of ion levels indicated that Na+ and K+ contents were all higher in AtNHX5-overexpressing leaves than in WT leaves in high saline conditions. The AtNHX5 plants had higher leaf water content and leaf chlorophyll contents, accumulated more proline and soluble sugars, and had less membrane damage than the WT plants under water deficiency and high saline conditions. Taken together, the results indicate that the AtNHX5 gene could enhance the tolerance of paper mulberry plants to multiple environmental stresses by promoting the accumulation of more effective osmolytes (ions, soluble sugars, proline) to counter the osmotic stress caused by abiotic factors. 相似文献
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李吉跃 《中国林学(英文版)》1996,(2)
本文研究了多重复干旱循环对１年生北美短叶松（ＰｉｎｕｓｂａｎｋｓｉａｎａＬａｍｂ．）和黑云杉（Ｐｉｃｅａｍａｒｉａｎａ［Ｍｉｌ］Ｂ．Ｓ．Ｄ．）苗木的气体交换速率及水分利用效率的影响。结果表面，多重干旱循环对它们的气体交换（Ｃｓ，Ｐｎ，Ｔｒ）有显著影响（Ｐ＜０．５），而对其水分利用效率（ＷＵＥ）影响不大（Ｐ＞０．１）。尽管北美短叶松的气孔对轻度干旱胁迫不如黑云杉敏感，但是它对中度及严重干旱胁迫的敏感程度却高于黑云杉。在轻度及中度干旱胁迫下，北美短叶松的光合作用主要受非气孔因素的影响，而黑云杉则主要受气孔因素的影响。解除干旱胁迫后，黑云杉的气孔敏感性、光合能力及水分利用效率的恢复都要比北美短叶松更快．我们认为，延迟脱水是北美短叶松的主要耐旱机理，而忍耐脱水则是黑云杉重要的耐旱途径。轻度的干旱胁迫锻炼可以帮助北美短叶松在更严重的干旱胁迫下保持固有而较强的耐旱能力。然而，通过多重复干旱循环锻炼后黑云杉在改善耐旱能力的强度方面则大于北美短叶松 相似文献
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以辽宁阜新种植的不同种源文冠果为研究对象,采用水分胁迫的方法探讨不同种源文冠果植物体内脯氨酸、可溶性糖和可溶性蛋白质对干旱环境的响应。研究结果表明:脯氨酸和可溶性糖含量随着水分胁迫的增加而增加,以延安和沈阳的2个种源的耐旱性较好。可溶性蛋白质变化幅度不大,不适宜作为反映文冠果的耐旱能力重要指标。 相似文献
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