Effect of Osmotic Stress with PEG6000 on Osmotic Adjustment Solute in Seedling Leaves of Chenopodium album L.

[ Objective] The purpose was to discuss drought resistance mechanism of Chenopodium album L. and supply theoretical basis and practical guidance for artificial cultivation and popularization of C. album. [ Method] C. album seedlings grown to 6th leaf stage were conducted osmotic stress treatment with PEG6000 osmotic whose concentration was set up as 0, 5%, 10% and 20% and the various physiological indices of the 3rd -5th function leaves in upper plant were determined after being treated for 0, 1,3, 5, 7 and 9 d. [ Result] Under osmotic stress with 5% PGE, the relative water content （RWC） of C. album reduced less. Under osmotic stress with 10%, the RWC in seedling leaves of C. album decreased to 62% on the fifth day and the leaves began to wither. Under osmotic stress with 20%, the RWC in seedling leaves of C. album decreased to 61.9% on the third day and the leaves appeared withering, and the RWC decreased to 48.6% on the 7th day and the leaves were dry and yellow. Proline contents in seedling leaves of C. album under osmotic stress with 5%, 10% and 20% PEG were 7.64, 10.9 and 29.4 times of CK on the 7th day. [ Conclusion] C. album hed some adaptability to moderate osmotic stress, but the PEG osmotic stress with high concentration and long time might lead to severe damage on C. album.

Effects of Nitrogen Application on Osmotic Adjustmentof Ramie (Boehmeria nivea L.) with Different NitrogenEfficiency

Ramie (Boehmeria nivea L.) is one of the most important fiber crops and biomass materials. However, previous studies showed that ramie presented a very low nitrogen agronomy efficiency (NAE, 23.2%~27.8%) in traditional farming, and the nitrogen fertilizer was applied excessively in ramie field. Plant osmotic adjustment (OA) responses to environmental stresses positively and exhibits improvements in plant tolerance. Whereas results varied due to the complexity of plant-environment interactions and lack of insights of specific species. In order to improve ramie production through osmoregulation, our current study investigated the role of nitrogen application and osmotic adjustment in improving the growth and yield in two varieties of ramie (H2000-03 and Ceheng Jiama) with contrasting nitrogen use efficiency (NUE) grown at 5 different N rates including N0, N6, N9, N12 and N15;0, 6, 9, 12 and 15 mmol/L N, respectively. The results showed that ramie adapted to different nitrogen rates through OA and significant differences of osmolyte content between varieties only presented at the particular growth stage. Obvious inflexion of yield, osmolyte content involving proline, soluble protein (SP), soluble sugar (SS) and malonaldehyde (MDA);nitrogen sensitive index (NSI) and comprehensive evaluation (D) in both varieties were observed. Our results recommended that the overall lifting of OA at a lower N level and at the proper growth stage would be a reasonable approach for improving ramie NUE.

Exogenous Glycine Betaine Reduces Drought Damage by Mediating Osmotic Adjustment and Enhancing Antioxidant Defense in Phoebe hunanensis

Drought stress negatively impacts growth and physiological processes in plants.The foliar application of glycine betaine(GB)is an effective and low-cost approach to improve the drought tolerance of trees.This study examined the effect of exogenously applied GB on the cell membrane permeability,osmotic adjustment,and antioxidant enzyme activities of Phoebe hunanensis Hand.-Mazz under drought stress.Two levels(0 and 800 mL)of water irrigation were tested under different applied GB concentrations(0,50,100,and 200 mM).Drought stress decreased the relative water content by 58.5%while increased the electric conductivity,malondialdehyde,proline,soluble proteins,soluble sugars,and antioxidant enzyme activities(superoxide dismutase,catalase,peroxidase)by up to 62.9%,42.4%,87.0%,19.1%,60.5%,68.3%,71.7%,and 83.8%,respectively,on the 25^(th) day.The foliar application of GB,especially at 100 mM,increased the relative water content of P.hunanensis leaves under drought stress.The concentration of GB from 50 to 100 mM effectively alleviated the improvement of cell membrane permeability and inhibited the accumulation of membrane lipid peroxidation products.Under drought stress,the concentrations of proline,soluble proteins,and soluble sugars in the leaves of P.hunanensis increased as the applied GB concentration was increased and the water stress time was prolonged.Exogenously applied GB decreased oxidative stress and improved antioxidant enzyme activities as compared with treatments without GB application.Furthermore,the physiological and biochemical indexes of P.hunanensis showed a certain dose effect on exogenous GB concentration.These results suggest that GB helps maintain the drought tolerance of P.hunanensis.

Osmotic adjustment of winter wheat leaves under different soil water stress

Two varieties of winter wheat,Bei Nong 2(B. N. 2)and Jing 411(J. 411),were selected for osmotic adjustment study. At wheat growing stages,from recovery period to mature period,leaf relative water content(LRWC) ,water potential(LWP)and saturated osmotic potential (LSOP) were positively correlated to soil relative water content (SRWC) and decreased as SRWC descended at each growth stage,and the decreasing range exhibited B. N. 2【J. 411. The turgor pressure(TP)of both the varieties decreased less than LRWC and LWP. It was shown that both varieties had a osmotic adjustment ability(OAA) ,and the decreasing range presented B. N. 2【J. 411. Both the varieties had a TP tubercle in TP vs SRWC graph at heading and filling stages,and their OAA was the strongest at these two stages.

Water Stress in <i>Beta vulgaris</i>: Osmotic Adjustment Response and Gene Expression Analysis in ssp. <i>vulgaris</i>and <i>maritima</i>

Beta vulgaris genus comprises wild and cultivated subspecies. The “maritima” subspecies is formed by wild or weedy accessions, well adapted to low-water potential environments;it was previously shown that B. vulgaris ssp. maritima has mechanisms of osmotic adjustment more effective than the cultivated B. vulgaris ssp. vulgaris. The response to a progressive lowering of soil potential was compared in two Beta accessions, a cultivated and a wild one. Throughout the 4-months experiment under rain shelters, osmotic potential and relative water content were measured and total RNA was extracted to test the expression of six target genes known in sugar beet or in other plants to be modulated by water shortage. The mild occurrence of drought was paralleled by slow increase in transcription for sucrose synthase 1 and choline monoxygenase, in a way that was in some cases accession-dependent, e.g. the gene for choline monoxygenase was found to be up-regulated at the later stages of growth in stressed plants compared to control ones, and showed a higher constitutive transcription in sea beet compared to sugar beet. Transcription factor DREB2Aalso was slowly induced during the growth season and upon onset of water shortage, and this induction was stronger in sea beet than in sugar beet. In control plants, the transcription of all genes tested except DREB2Awere significantly higher in maritima accession compared to vulgaris one.

Ion Accumulation, Water Relations and Osmotic Adjustment in Atriplex argentina, A. crenatifolia, A.lampa and A. nummularia under Saline Conditions

Salinity is a major stress that adversely affects growth and productivity in plants. There are species that tolerate this stresswithin the genus Atriplex. Four species, A. lampa, A. crenatifolia, A. nummularia and A. argentina were compared for their ionaccumulation and water relations under saline conditions. A greenhouse study was conducted by irrigating the four species with NaCIsolutions at concentrations 0%, 1%, 2% and 4% starting when plants were six months old. Plants were harvested 45 d after startingthe salinity treatments and analyzed for their ion contents. In the four Atriplex species, Na^＋ and Cl^- contents in plants increased, whileCa^2＋ and Mg^2＋ decreased with the increase of salinity in the irrigation solution. The results suggested that A. argentina and A.nummularia were able to maintain a higher leaf relative water content （RWC） at low leaf water potential, which was associated witha greater capacity of osmotic adjustment. A. lampa showed lower ion accumulation and minor osmotic adjustment than the otherspecies. It can be concluded that the accumulation of ions favors the lower osmotic potential and contributes to osmotic adjustment inthese halophytes.

外源硅对盐胁迫下棉花渗透物质含量和钠钾平衡的影响

以陆地棉‘中J9807’(以下简称Z9807,耐盐材料)和‘中J0102’(以下简称Z0102,盐敏感材料)为试验材料开展温室水培试验,设置NaCl 0和150 mmol·L^(-1)两个盐浓度与Na 2 SiO 30和0.4 mmol·L^(-1)两个硅浓度,共8个处理。处理14 d后,测定棉花幼苗根系表型指标、叶片渗透调节物质含量、钠、钾含量及相关基因表达量。结果表明:盐胁迫显著降低了两个棉花材料根系的总根长、总表面积及总体积,外源硅的添加显著改善了根系的生长。施硅显著增加盐胁迫下棉花幼苗可溶性糖和可溶性蛋白含量,减轻盐引起的渗透胁迫。盐胁迫引起Na^(+)在棉花根系及地上部的大量积累,显著降低K+含量,导致Na/K比值增大。外源硅降低盐胁迫下两棉花材料地上部Na^(+)含量和Na/K,并显著降低耐盐材料Z9807地上部根系Na^(+)含量和Na/K比值,缓解盐胁迫引起的离子失衡。硅对盐敏感材料Z0102盐胁迫下离子稳态及耐盐能力的调节主要是通过显著上调SOS1和HKT1的表达,促进Na^(+)外排和区隔化,减少地上部Na^(+)的积累;而对耐盐品种的调节主要是下调HKT1的表达,减少了向地上的转运,并通过上调HAK5的表达促进高Na^(+)环境中K+的吸收,从而降低Na/K比值。综上,外源硅通过调节棉花幼苗中渗透调节物质含量,以及钾吸收、钠的外排和区隔化等关键基因的表达,提高棉花幼苗耐盐性。

妇产科护士工作适应障碍的现状调查分析

目的通过调查了解妇产科护士工作适应障碍现状以及影响因素,以提高妇产科护士的工作适应能力。方法采用明尼苏达多相人格调查表中的工作适应障碍量表对吴川市两家医院妇产科102名护士进行问卷调查,并对调查所得数据进行统计学分析。结果妇产科护士工作适应障碍得分为(22.04±3.21)分,明显高于我国成年女性常模(P<0.05)。其工作适应障碍受年龄、职称、学历、婚育、收入、护龄等因素影响(P<0.05)。结论妇产科护士存在一定程度的工作适应不良、缺乏工作动机,适应障碍较严重,且受个体因素影响,护理管理者应予以重视,给予其关爱和帮助,提高其工作适应能力和职业能力;妇产科护士应注重提高自身心理素质和抗压能力,培养沟通交流技巧,以有效解决护患矛盾,增强工作适应性,减少工作适应障碍。

外源褪黑素对受渍芝麻幼苗生长及抗氧化代谢的影响

为探究不同浓度褪黑素对苗期受渍芝麻(Sesamum indicum L.)的影响,本研究以鄱阳黑为试验材料,采用盆栽试验,在渍水胁迫下设置6个浓度(0、50、100、200、400、800μmol·L^(-1),分别记为M0、M1、M2、M3、M4、M5)褪黑素喷施处理,以正常供水为对照(CK),调查芝麻幼苗的叶片生理指标、根系形态变化,并采用主成分分析和隶属函数法对芝麻幼苗的耐渍性进行综合评价。结果表明,与对照相比,渍水胁迫下各处理芝麻幼苗生长受到抑制,总根长、根表面积和根体积分别平均减少38.42%、30.28%和7.51%;叶片MDA和H2O2含量平均显著增加62.71%和108.99%。同时,与对照相比,渍水处理SOD、CAT活性和脯氨酸含量显著提高,POD活性和可溶性蛋白含量降低;喷施褪黑素可缓解渍害对芝麻幼苗的抑制作用,主要表现为提高幼苗总根长、根表面积、根直径和根体积,降低膜质过氧化损害程度。与M0相比,M1和M2处理叶片MDA、H2O2含量分别下降13.02%~24.17%、13.94%~25.81%,SOD、POD和CAT活性分别上升22.19%~16.59%、36.47%~74.84%和3.26%~13.76%,可溶性蛋白和脯氨酸含量分别增加47.68%~48.67%和22.46%~33.25%。主成分分析和隶属函数综合评价结果显示,耐渍性强弱表现为M2>M1>M3>M4>M5>M0,以100μmol·L-1褪黑素处理(M2)对受渍芝麻幼苗的缓解效果最好。综上,叶面喷施褪黑素溶液能有效缓解渍水胁迫对芝麻幼苗造成的损伤,清除植株体内过量的有毒物质,维持细胞膜结构的稳定性和渗透平衡,从而提高芝麻幼苗的耐渍性。本研究结果为提高芝麻耐渍性提供了理论依据。

难治性哮喘患儿重返学校适应现状及其影响因素分析

目的:调查难治性哮喘患儿重返学校适应现状,并分析其影响因素。方法:采用一般资料调查表、社会支持量表、自我护理能力评估量表、学校生活适应量表对长沙市某三级甲等专科医院呼吸内科返院门诊随诊的256例难治性哮喘患儿进行调查。结果:难治性哮喘患儿学校生活适应量表总分为(62.35±6.34)分,多元线性回归分析结果显示难治性哮喘患儿重返学校适应的影响因素包括疾病严重程度、疾病控制情况、病程、复发次数、社会支持水平及自我护理能力。结论:难治性哮喘患儿重返学校适应处于较低水平,医护人员需重点关注难治性哮喘患儿重返学校适应现状,并根据其影响因素制订针对性管理方案,以提高其适应学校生活的能力。

根灌外源褪黑素对干旱胁迫下紫花苜蓿生理特性的影响研究

为探究褪黑素对干旱胁迫下紫花苜蓿(Medicago sativa L.)生长的影响,本研究以‘中苜3号’紫花苜蓿为试验材料,设置正常供水和干旱2个水分梯度,采用盆栽试验根灌不同浓度褪黑素,分析不同条件下幼苗表型、生理生化指标的变化。结果表明:90μmol·L^(-1)褪黑素处理能够显著提高紫花苜蓿幼苗株高、茎粗、相对含水量、相对叶绿素含量,此外,90μmol·L^(-1)褪黑素处理显著增加干旱胁迫下紫花苜蓿幼苗叶片抗氧化酶活性及酶合成相关基因表达水平,并降低脯氨酸、可溶性糖含量及丙二醛、相对电导率、过氧化氢含量。综上所述,褪黑素提高干旱胁迫下紫花苜蓿幼苗抗氧化酶生物合成基因表达水平,增强抗氧化酶活性,清除过量活性氧,缓解膜损伤,提高幼苗抗旱性。

Research on the Ability of Regional Industrial Sustainable Development

In this paper, firstly, we construct the regional industrial sustainable development indicator system which are consist with resource, environment, technology and industrial economy efficiency levels and 16 indicators from the perspective of “two-oriented society”;Secondly, using the method of AHP to determine the weight of each indicator and evaluate the ability of industrial sustainable development of 30 regions in China;Finally, according to the results, we used the method of cluster analysis to put the regions into classification and then author put forward certain suggestions to improve the ability of industrial sustainable development of each region.

海洋贝类对盐度胁迫适应机制的研究进展

盐度是影响海洋贝类存活、生长、发育、繁殖等生命活动的关键因素,其生命活动时刻受到海洋局部环境中盐度变化的影响。对海洋贝类适应盐度胁迫机制的研究是学术界长期关注的问题。大量研究表明,盐度胁迫会对海洋贝类的生长、渗透调节、能量代谢和免疫反应等生物学过程产生影响。近年来,随着基因组、转录组等组学技术的发展和广泛应用,许多研究从分子水平来探讨海洋贝类适应盐度胁迫的机制。本文综述了海洋贝类在盐度胁迫过程中的调控机制,包括渗透调节、能量代谢、免疫反应,以及转录组和基因组在海洋贝类盐度胁迫机制研究中的应用,提出了广盐性海洋贝类在盐碱水领域中的开发潜力,为海洋贝类抗逆品种选育以及绿色养殖提供重要参考。

新质生产力赋能农业经济韧性提升:理论逻辑、现实挑战与实践路径

加快发展新质生产力是新时代实现我国经济和社会高质量发展的必然要求,也是我国增强农业韧性、加快建设农业强国的必然选择。新质生产力凭借新型劳动者、新型劳动资料、新型劳动对象三大构成要素对农业的生产体系、经营体系和产业体系赋能增效,从而提升农业的抵御风险能力、适应调整能力和转型创新能力,有效增强农业经济韧性。新质生产力赋能农业经济韧性提升仍面临较大挑战,主要体现在:农业科技自主创新能力有待提升、科技创新成果推广和应用不足,农业人才供给数量不足、质量不高,农村产业结构相对单一、规模效应不显,农业新型基础设施发展滞后、农业生产效率不高,财政支农政策和农业科技创新体制机制有待完善。以新质生产力赋能农业经济韧性提升,要根据国家战略需求和国情农情特点,在科技创新、人才培养、产业体系、基础设施和体制机制等多个层面精准施策,进一步破解新质生产力发展难题,增强农业经济韧性。

地方公共预算稳定调节能力与债务风险关系研究——基于“四本预算”统筹的视角

公共预算稳定调节机制是我国2007年以来设置的跨年度预算平衡机制。笔者以2015—2021年我国内地31个省级政府为研究样本,根据现行财政预算管理体制特点,实证检验地方公共预算稳定调节能力对债务风险的影响。研究结果显示,地方公共预算稳定调节能力可显著抑制债务风险,该影响通过增强财政韧性、缓解财政压力发挥作用。且在产业结构合理化水平和数智化程度偏低的地区,地方公共预算稳定调节能力对债务风险的抑制作用更明显。进一步分析表明,公共预算稳定调节能力还可抑制债务率和增加地方政府债务限额的空间留存率,该结论对一般债务率和一般债务限额的空间留存率仍旧成立。据此建议优化预算稳定调节基金补充机制,构建预算稳定调节基金动用与债务风险的关联机制,通过财政金融的协调治理,发挥公共预算稳定调节机制对中长期债务风险波动的“调节器”作用。

盐胁迫对不同种质小黑麦幼苗水分利用效率和渗透调节的影响

为探讨小黑麦幼苗经过盐胁迫后水分利用效率和渗透调节系统的响应机制,选用10份不同种质小黑麦为对象,以土壤含盐量0.6%NaCl为胁迫组,正常浇水为对照组(CK),研究盐胁迫对小黑麦生长、水分利用特征、渗透调节物质含量的影响,以明确不同种质小黑麦苗期耐盐能力的强弱,为宁夏地区耐盐小黑麦品种评价提供理论依据。结果表明:盐胁迫抑制小黑麦的正常生长,促进其水分利用效率和渗透调节物质的积累与转移。在盐胁迫下,X-520的株高最高,X-516次之,SD的分蘖数和地上生物量最多;此外,SD、X-520和X-516的稳定碳同位素(δ13C)含量较高,分别为-27.33‰、-27.40‰和-27.39‰;SD的脯氨酸、可溶性蛋白和淀粉含量均为最高。相关分析表明,δ^(13)C与相对含水量、有机渗透调节物质、根系钠离子、叶片钾离子间均显著正相关(P<0.05)。通过聚类分析得出,不同种质小黑麦耐盐能力强弱可分为3类,耐盐性较好(SD、X-520、X-516),耐盐性一般(JIN、J-46),耐盐性较差(T-5、HN、T-9、XJ、T-11);同时,经主成分综合评价(PCA)得出不同种质小黑麦的耐盐性高低顺序依次为SD>X-520>X-516>J-46>JIN>HN>T-11>T-9>T-5>XJ。因此,建议将SD、X-516和X-520作为宁夏盐碱地推广种植的育种材料。

斑块面积对干燥-复水条件下藓类植物生理活性的影响

干扰会导致生物结皮斑块破碎并退化。为明确生物结皮斑块破碎诱发生物结皮退化机理,以黄土丘陵区土生对齿藓(Didymodon vinealis)结皮为研究对象,研究了干燥-复水条件下,单株和直径1 cm、2 cm、3 cm、4 cm、5 cm的藓结皮斑块内土生对齿藓的干燥速率、渗透调节物质、丙二醛和光合色素含量等的变化,以期揭示干扰后生物结皮退化的生物学机理。结果表明(1)除单株外,干燥速率随斑块面积减小而增加,直径1 cm斑块内藓的干燥速率是直径5 cm的2倍。(2)反复干燥-复水25天后,直径小于5 cm的斑块内藓的可溶性糖、可溶性蛋白和叶绿素含量低于直径5 cm斑块内藓的含量,丙二醛含量随斑块面积变化无明显规律。(3)干燥速率与斑块面积、可溶性糖、可溶性蛋白及叶绿素含量均呈极显著负相关。以上结果表明,藓结皮斑块面积通过影响斑块内藓类植物干燥速率进而影响其渗透调节和光合作用能力。藓结皮斑块面积减小,藓类植物干燥速率增大,生理活性降低,是藓结皮斑块破碎诱发其退化的原因。研究从藓类植物生理的角度,阐明了干扰后藓类植物衰亡的生理学原因,为生物结皮的保护和管理提供了科学依据。

内生真菌对宿主布顿大麦耐碱性的渗透调节和膜系统影响

为了研究带内生真菌(E+)和不带内生真菌(E-)布顿大麦(Hordeum bogdanii)的耐碱性,选择来源于新疆阿克苏温宿县的带内生真菌(E+)和不带内生真菌(E-)布顿大麦种子,先在培养皿中进行发芽,然后进行室内蛭石无土栽培,对其进行21 d的不同浓度混合碱胁迫处理,测定其渗透调节和膜系统变化。结果表明,在相同混合碱处理下,E-植株的相对电导率均显著高于E+植株(P<0.05),E+植株的细胞通透性弱于E-植株。在碱胁迫下E+植株的脯氨酸、可溶性糖和可溶性蛋白含量均显著高于E-植株(P<0.05)。内生真菌具有提高宿主渗透调节物质和降低膜损伤来提高布顿大麦抗碱的能力。

盐胁迫对菊花‘紫燕翻飞’生长及生理特性的影响

为探究盐胁迫对大菊生长及生理特性的影响,明确其对盐胁迫响应的生理机制,本试验以传统大菊品种‘紫燕翻飞’为材料,设置不同浓度盐(0、50、100、150、200 mmol/L NaCl)胁迫处理,研究其对‘紫燕翻飞’株高、叶长、叶宽、植株地上部和地下部干重、根冠比以及叶片丙二醛(MDA)含量、脯氨酸含量、超氧化物歧化酶(SOD)活性、过氧化物酶(POD)活性、相对电导率(REC)、叶绿素含量、相对含水量的影响。结果表明,与对照(0 mmol/L NaCl)相比,随着NaCl浓度升高,株高呈下降趋势,叶长、叶宽无显著变化,地上部干重、地下部干重整体呈下降趋势,根冠比则呈上升趋势;50 mmol/L NaCl处理下,各生长指标与对照相比无显著差异,当NaCl浓度增至100、150、200 mmol/L时,株高、地上部干重、地下部干重较对照均显著降低(100 mmol/L NaCl处理的株高除外),根冠比均显著增大。随着盐浓度升高及胁迫时间延长,菊花‘紫燕翻飞’叶片MDA含量、相对电导率及脯氨酸含量均呈逐渐上升趋势;低浓度盐(50、100 mmol/L NaCl)胁迫下,叶片SOD、POD活性呈升高趋势,高浓度盐(150、200 mmol/L NaCl)胁迫下,SOD和POD活性均呈现先升后降的变化趋势,且均显著高于对照;叶片叶绿素含量、相对含水量则均呈逐渐下降趋势。可见,盐胁迫处理下菊花‘紫燕翻飞’幼苗生长受到一定程度的抑制,植株可通过提高脯氨酸含量、增强SOD和POD活性来减缓盐胁迫对其造成的伤害,因此该品种菊花具备一定的耐盐能力。

外源甜菜碱对烤烟幼苗干旱胁迫的缓解效应

为明确甜菜碱缓解烤烟干旱胁迫的作用机理,以秦烟96为供试品种,用15%的聚乙二醇(PEG 6000)模拟干旱胁迫环境,探究叶面喷施不同浓度(35、40、45、50 mmol/L)的甜菜碱对烤烟幼苗农艺性状及相关生理指标的影响,同时以正常条件下生长的烟苗为正面对照(CK),以干旱胁迫下生长的烟苗为负面对照(CK0),共设6个处理。结果表明,干旱胁迫显著抑制了烤烟幼苗的生长发育,而叶面喷施甜菜碱可以缓解干旱对烤烟幼苗胁迫,其中,45 mmol/L的甜菜碱处理缓解效果最佳,该处理下烤烟幼苗的株高、叶面积、地上部干质量分别较CK0显著增加了6.69%、38.78%和25.00%;超氧阴离子产生速率和MDA含量分别较CK0显著降低了39.88%和52.28%;SOD、POD和CAT活性分别分别较CK0显著增加了44.04%、36.33%和104.26%;叶绿素含量、Pn、Gs和Tr分别较CK0显著增加了177.38%、116.85%、72.97%、67.27%,而Ci较CK0显著降低了22.31%;脯氨酸和可溶性蛋白含量分别较CK0显著提高了156.64%和93.58%;根系活力较CK0显著增加了130.77%;失水率较CK0显著降低了27.27%,而相对含水率较CK0显著提高了12.35%。整体来看,喷施适宜浓度的外源甜菜碱可以显著缓解干旱胁迫对烤烟幼苗的伤害。