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Juan Jin Huimei Cui Xinmin Lv Yifan Yang Yi Wang 《The Journal of Horticultural Science and Biotechnology》2017,92(1):98-106
In this study, we investigated the effects of 10 mM CaCl2 on membrane permeability, malondialdehyde (MDA), reactive oxygen species (ROS), and Na+, K+, Ca2+, and Mg2+ concentrations in different organs of sour jujube grown under 150 mM NaCl stress. Our results showed 73% leaf wilting in the Na treatment. The Na treatment significantly increased leaf superoxide (O2.?) production rates, hydrogen peroxide (H2O2) concentrations, cell membrane permeability, MDA concentrations, and Na+ concentrations in roots, stems, and leaves. The Na treatment significantly reduced K+, Ca2+,and Mg2+ concentrations in roots, but increased K+ concentrations in stems. Compared with the Na treatment, 39% of the leaves showed wilting symptoms in the Na+Ca treatment. The Na+Ca treatment significantly decreased leaf O2.? production rates, H2O2 concentrations, cell membrane permeability, and MDA concentrations. Moreover, the Na+Ca treatment (1) significantly reduced Na+ concentrations in roots, stems, and leaves; (2) significantly increased root K+ concentrations; (3) significantly increased K+/Na+ ratios in roots; (4) significantly increased Ca2+ concentrations in stems and leaves, and Mg2+ concentrations in roots. In conclusion, exogenous CaCl2 reduces NaCl stress in sour jujube by reducing Na+ concentrations and increasing K+, Ca2+, and Mg2+ concentrations in various plant organs. 相似文献
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以加工番茄品系KT-7为试验材料,研究了不同浓度(0.010、0.025 mmol·L-1)外源CO对盐胁迫(150 mmol·L-1)下加工番茄的光合参数、快速荧光动力学曲线、渗透调节物质等生理特性的影响。结果表明,盐胁迫抑制了加工番茄的光合和生长,导致光合同化效率降低和PSⅡ反应中心活性下降,净光合速率Pn、干物质积累量分别降低了72.11%、35.04%。叶片喷施CO供体可不同程度地改变OJIP曲线形状,增加光合色素含量,提高光合同化效率,调控渗透性调节物质含量,降低盐胁迫对细胞膜结构的伤害;其中以Na150H1效果最佳,叶绿素a、叶绿素b含量与盐胁迫处理相比分别提高了10.58%、19.52%,净光合速率、表观CO2利用效率与盐胁迫相比分别提高了87.24%和152.58%,脯氨酸和可溶性糖含量与盐胁迫相比分别降低了40.16%、25.18%。综上所述,适宜浓度的外源CO提高了叶片的光合能力,激活自我保护机制,降低过量的活化电子对细胞光合膜结构的破... 相似文献
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调亏灌溉对新疆滴灌春小麦土壤水分、硝态氮分布及产量的影响 总被引:2,自引:2,他引:0
2017年和2018年在北疆滴灌春小麦栽培中,额定施氮量为纯氮300kg/hm2,设置3个调亏灌水量(水分不调亏E1:100%ET0;水分中度调亏E2:80%ET0;水分重度调亏E3:60%ET0)和2个小麦品种(水分敏感型X1:新春22;水分不敏感型X2:新春44),灌溉频率为7天1次。研究不同处理对滴灌春小麦土壤水分、硝态氮分布及产量的影响。结果表明:(1)水分重度调亏(E3)可以缓解0—40cm土壤水分和土壤硝态氮向深层流失,减少作物耗水量,提高水分利用效率。(2)新春22和新春44在土壤质量含水量、土壤硝态氮含量指标上无显著的品种间差异,小麦品种对于土壤理化性质的影响较小。(3)在水分中度调亏(E2)处理下,新春44(X2)能在节约大量灌水同时,提高水分利用效率,保持最适的氮素营养指数(NNI),进而使产量得到了显著的补偿,而新春22(X1)通过中度和重度调亏不能使产量得到有效的补偿。(4)在同一灌溉频率、施氮量水平下,品种对滴灌春小麦水分利用效率的影响大于调亏灌溉水平对滴灌春小麦水分利用效率的影响。(5)水分不敏感型品种新春44(X2)更适合在北疆地区采用调亏灌溉模式生产,综合考虑氮素营养指数(NNI)、耗水量、水分利用效率及产量,其最适的调亏灌溉水平为E2。 相似文献
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利用在小RNA高通量测序试验中筛选出的脱萼组与宿萼组差异表达新miRNA基因,采用 Stem-loop法对总体表达量居前20位、在脱萼组和宿萼组中具有显著性差异表达、在子房和萼片组织中具有显著性差异表达的新miRNA进行成熟体的克隆鉴定、前体序列二级结构分析、qRT-PCR试验以及靶基因预测。结果显示,在不同的样本中有9个新miRNA(novel_miRNA)的成熟体序列以及4个novel_miRNA的表达量与高通量测序结果完全一致,并且预测得到大量具有生物学功能的靶基因。新发现的miRNA可能与‘库尔勒香梨’萼片脱落和宿存有密切关系。 相似文献
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【目的】研究NaCl胁迫下外源ALA对酸枣幼苗叶绿素含量、光合特性及膜脂过氧化的影响,筛选缓解NaCl胁迫的最佳ALA处理浓度。【方法】以酸枣幼苗为试材,测定幼苗叶片在150 mmol/L NaCl胁迫下喷施不同浓度的外源ALA(50、75、100和150 mg/L)后第3 d和第6 d的叶绿素含量、光合特性、抗氧化酶活性及MDA含量的影响。【结果】150 mmol/L NaCl胁迫下酸枣幼苗叶片的叶绿素含量、光合特性及抗氧化酶活性均显著下降。喷施外源ALA可以显著提高NaCl胁迫下酸枣叶片叶绿素含量光合指标和抗氧化酶的活性,降低Ci和MDA含量。其中,以ALA处理后第3 d的T3处理的效果最佳,叶绿素a、总叶绿素含量、Pn、Gs、Tr、SOD、POD和CAT分别增加了67.50%、72.74%、85.71%、135%、87.06%、20.79%、69.59%、和61.25%;Ci和MDA分别降低了22.53%和24.71%。【结论】NaCl胁迫对酸枣造成了明显的损害,抑制其光合作用,破坏了抗氧化酶系统;喷施外源ALA能够通过提高叶绿素含量,增强抗氧化酶活性,促进叶片的光合作用,缓解NaCl胁迫对酸枣幼苗的伤害,提高酸枣的耐盐性;Chl a、Chl、SOD和CAT可以作为评价喷施不同浓度ALA对NaCl胁迫缓解效果的主要指标;不同浓度的外源ALA均能有效缓解NaCl胁迫对酸枣幼苗的伤害,并以100 mg/L ALA处理在第3 d缓解效果最佳。 相似文献
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CaCl_2对NaCl胁迫下酸枣苗AsA-GSH循环的影响 总被引:1,自引:0,他引:1
以酸枣(Ziziphus acidojujuba C.Y.Cheng et M.J.Liu)水培实生幼苗为试材,研究了CaCl_2对NaCl胁迫下其根、茎、叶中抗坏血酸—谷胱甘肽循环(AsA-GSH)的影响。结果表明:与对照(日本园试配方营养液)相比,NaCl处理下根和叶中AsA含量升高,MDHAR活性升高,APX活性下降;根、茎、叶中GSH含量升高。NaCl+CaCl_2处理与NaC处理相比,根和茎中AsA含量进一步升高,叶中AsA含量下降,叶中APX下降,根中MDHAR活性进一步升高,茎和叶中DHAR活性升高;根和叶中GSH含量下降。外源CaCl_2可能通过提高酸枣实生苗根、茎和叶中AsA再生关键酶MDHAR和DHAR活性,促进根和茎中AsA的再生与生物合成,从而提高根、茎清除过量H_2O_2的能力,缓解NaCl胁迫对酸枣幼苗根和茎部的伤害。 相似文献
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Li Ma Chenjing Li Maosong Pei Fujun Cao Shaowen Quan 《The Journal of Horticultural Science and Biotechnology》2019,94(3):305-316
The objective of the study was to learn more about some newly identified miRNAs related to calyx persistence in Korla fragrant pear (Pyrus sinkiangensis Yu). Small RNAs were subjected to high-throughput sequencing after extraction from the ovaries and sepals of flowers with either a deciduous or a persistent calyx. Differentially expressed miRNAs were screened, and 73 new miRNAs were obtained. Twenty of these new miRNAs were selected to further validate all of the new miRNAs. Their mature miRNAs were cloned and identified, the secondary structures of the precursor miRNAs (pre-miRNAs) were analysed, and then qRT-PCR analysis was conducted. The results showed that the mature sequences of nine new miRNAs (novel_miRNA) in different samples were consistent with the results of high-throughput sequencing. Overall, this study improved current methods for the molecular cloning and identification of fruit tree miRNA. Nine new miRNA types were identified. This study laid a good foundation for elucidating the biological functions of these new miRNAs. 相似文献
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