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1.
四个梨品种果实套袋试验 总被引：2，自引：0，他引：2
１９９８年进行，试验地为红壤丘陵，供试品种有新世纪（５年生和１０年生），黄花、杭青（５年生），金水二号（１０年生），均为棠梨砧。梨园管理水平一致，植株生长结果大致相同。供试果袋为河北省石家庄果树研究所研制的“海河牌”ＬＢ４型梨果实袋。均设套袋与不套袋... 相似文献
2.
以黄瓜幼苗为试材,研究了淹水胁迫(0、4、8、12d)对黄瓜幼苗生长指标及不定根解剖结构的影响。结果表明:淹水胁迫抑制了黄瓜幼苗的根、茎、叶鲜质量、株高及子叶上下1cm处茎粗的正常生长,淹水胁迫4d对根、茎、叶鲜质量及株高产生显著抑制作用,淹水8、12d分别显著抑制了子叶上、下1cm处茎粗生长,而淹水胁迫12d内未对黄瓜幼苗叶片数的生长起到抑制作用。黄瓜幼苗叶片MDA含量在淹水胁迫4d后淹水处理显著高于对照。淹水胁迫12d后,黄瓜不定根皮层出现溶生性通气组织,但不发达。说明黄瓜幼苗具有一定的耐淹水能力,但能力有限。 相似文献
3.
淹水胁迫对丝瓜和苦瓜幼苗形态及不定根解剖结构的影响 总被引：1，自引：0，他引：1
以荆州本地丝瓜和香帅5号为试材,研究淹水胁迫对丝瓜和苦瓜幼苗形态、不定根解剖结构和屏障结构的影响。结果表明:丝瓜幼苗淹水胁迫12 d内株高、叶片数及鲜质量与对照差异不显著,淹水胁迫16 d后才显著低于对照,而苦瓜幼苗淹水胁迫4 d后株高、叶片数及鲜质量均显著低于对照。丝瓜幼苗淹水胁迫8 d后淹水部位茎粗(子叶以下1 cm处)显著大于对照,但苦瓜幼苗与对照差异不显著。淹水胁迫16 d后,丝瓜幼苗不定根内有发达的通气组织,而苦瓜没有形成;淹水后丝瓜幼苗不定根幼嫩部位(距根尖20 mm处)出现具明显凯氏带且栓质化的内皮层,而苦瓜幼苗不定根在距根尖40 mm处才出现。说明淹水后丝瓜幼苗不定根内发达的通气组织以及20~40 mm处的屏障结构是丝瓜比苦瓜耐淹水的主要原因。 相似文献
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5.
生长调节剂对金水一号梨物候期和坐果率的影响 总被引：1，自引：0，他引：1
金水一号梨花期偏早,缺乏优良的授粉品种,坐果率低.用赤霉素(GA~3)50、100、200mg·1~(-1)和2,4-D10、20、40mg·1~(-1)进行了喷施试验,结果表明:GA_3 100、200mg·1~(-1)比对照推迟落叶13—17d、萌动期3—5d、盛花期3—4d,提高坐果率2—4倍,株产增加2.5—2.7倍,效果最好;2,4—D20mg·1~(-1)效果次之;GA_3 50mg·1~(-1)和2,4—D10mg·1~(-1)落叶期明显推迟,坐果率显著提高;其它处理与对照无异. 相似文献
6.
PBO对金水1号梨新梢生长与座果的影响(初报) 总被引：1，自引：0，他引：1
试验于花前15d进行,分根施、喷施两种方法,以不同浓度的PBO对金水1号梨进行处理。结果表明:PBO能显著抑制金水1号梨新梢生长,提高其座果率,在几种处理中,以根施15g/株效果最好。 相似文献
7.
淹水对不同葫芦科作物叶绿素荧光特性的影响 总被引：4，自引：0，他引：4
在温室条件下,研究了根部淹水3d及淹水恢复3d后对黄瓜、丝瓜、苦瓜、黑籽南瓜叶绿素荧光参数的影响。结果表明,淹水对黄瓜、黑籽南瓜造成的胁迫最大,其光适应下初始荧光（F0’）、光适应下最大荧光（Fm’）、表观光合电子传递速率（ETR）、实际光化学量子产量（Yeild）、光化学猝灭系数（qP）显著降低,非光化学猝灭系数（qN）极显著升高;丝瓜表现为最耐淹水,苦瓜次之;淹水恢复3d后,黄瓜、黑籽南瓜的光系统II最大光化学效率（Fv／Fm）和其对照出现显著性差异,说明淹水对其光抑制的表现可能在恢复时才显现出来;试验中黄瓜恢复最慢,而黑籽南瓜恢复相对较快;淹水对黑籽南瓜胁迫较重可能和其处理时叶片数量较多有关。 相似文献
8.
金水1号梨授粉品种的选配初探 总被引：1，自引：0，他引：1
选用黄花和安农 1号分别对主栽品种金水 1号进行授粉试验 ,结果表明 :金水 1号的有效授粉时期为开花后的 1～ 5天 ,安农 1号和黄花均可作为金水 1号的授粉品种 ,但以黄花最为适宜 ,其与金水 1号的花期基本相遇 ,正反交的座果率也较高。 相似文献
9.
淹水胁迫对茄子生长和光合作用的影响 总被引：1，自引：0，他引：1
为了了解淹水条件下茄子对环境的适应性及耐淹水性,研究了不同淹水时间(1、3、5、7、9d)对茄子生长和气体交换参数的影响。结果表明:淹水时间越长,茄子地上部鲜质量和干质量降低越明显,当植株淹水处理3d后,便和对照出现显著性差异;同样,茄子净光合速率也随着淹水时间延长而降低,淹水5d后,净光合速率显著降低,气孔导度、蒸腾速率和净光合速率呈相似变化。非气孔因素是淹水茄子光合作用降低的主要原因;此外,茄子淹水3d可以较快得到恢复,而淹水5~9d虽然仍能得到一定的恢复,但难以达到对照水平。 相似文献
10.
早熟苹果新品种“金水苹”简介 总被引：1，自引：0，他引：1
《中国果树》1980,(1)
<正> “金水苹”(原代号:65～1)系湖北省农科院果茶研究所于1964年以“瑞香”为母本,“老笃”为父本杂交育成. 1974年初选,1979年经湖北省科委和农办联合主持召开鉴定会,正式定名为“金水苹”.目前省内有武汉、武昌、钟祥、枣阳等13个市、县及河南、江西等8个省、市有 相似文献
11.
AIM: Although endovascular radiotherapy inhibits neointimal hyperplasia, the exact alterations induced by β-particles irradiation remain to be elucidated. The objective of this study was to investigate the ability and the cellular mechanism of local β-particles emission from 188Re to inhibit vascular smooth muscle cells (SMCs). METHODS: The SMCs in vitro were irradiated by 188Re with single doses of 2.6 Gy-25.8 Gy. The effects of β-particles on SMCs, such as effective irradiate doses, the period of inhibition for SMCs proliferation, the changes of cell proliferation rate and DNA synthesis rate, cell cycle progression and related gene expression, were investigated by cell count, [3H]-TdR incorporation, cell cycle progression analysis, cell viability and immunocytochemistry, respectivecy. RESULTS: β-particles irradiation with dose of 5.2 Gy could inhibit significantly SMCs proliferation. At dose of 20.6 Gy DNA synthesis inhibitory rate was 92%, SMCs proliferation rate was only 3%. Renoval of 188Re did not abolish the inhibitory effects of β-particles on SMCs proliferation. The expression of P53 was up regulation and PCNA was down regulation after irradiation. CONCLUSION: β-particles from 188 Re was significantly effective and permanent in inhibiting SMCs proliferation, and inhibitory effect was in dose-dependet manner ED50was 5 Gy, the best dose to inhibit SMCs proliferation was 20 Gy. β-particles irradiation induced SMCs to occur G0/G1 arrest, damaged the ability of SMCs reproliferation and led to cell clonogenic death. P53 and PCNA had regulatiory effects on SMCs proliferation after β-particles irradiation. 相似文献
12.
多效唑对猕猴桃离体试管苗生长及内源激素的影响 总被引：18，自引：0，他引：18
多效唑（ＰＰ３３３）处理猕猴桃试管苗，降低了其生长强度；植株体内的ＧＡ３、ＩＡＡ和ＺＴ含量下降，ＡＢＡ的含量上升，乙烯释放率增加；并且能降低外源的ＧＡ３和ＩＡＡ促进生长的作用，而外源的ＧＡ３和ＩＡＡ又能不同程度地逆转多效唑的抑制作用，使植株恢复生长。 相似文献
13.
HU Zhi-cheng ZHU Jia-yuan ZHU Bin GUO Dong CHEN Bin ZHANG Kai HU Kun-hua LI Ming-tao TANG Bing 《园艺学报》2011,27(9):1802-1806
AIM: To investigate and screen the sensitive proteins in the formation mechanism of pathological scars by comparing the results of differential proteomic analysis between pathological scars and normal skin.METHODS: Two-dimensional gel electrophoresis was used to detect the protein expression profiles in 8 keloid patients, 8 hypertrophic scar patients and 3 matched normal skin patients.The proteins that showed differential expression of over 4-fold change were cut and analyzed by MALDI-TOF/TOF mass spectrometry.RESULTS: A two-dimensional protein profiling comparison between pathological scars and normal skin was successfully established.On average, 2 978 spots in keloid, 2 975 spots in hypertrophic scar and 3 053 spots in normal skin were identified using gel analysis software.Compared with normal skin, there were totally 36 differentially-expressed proteins in keloid and hypertrophic scar identified from the spots of over 4-fold change, including 16 proteins in both keloid and hypertrophic scar (8 up-regulated and 8 down-regulated), 11 only in keloid (9 up-regulated and 2 down-regulated) and 9 only in hypertrophic scar (4 up-regulated and 5 down-regulated).CONCLUSION: Proteomic analysis can identify the proteins with variance of pathological scars versus normal skin, thus providing probable new clues to reveal the formation mechanism of pathological scars. 相似文献
14.
Duncan Brean W. Boyle Shannon Breininger David R. Schmalzer Paul A. 《Landscape Ecology》1999,14(3):291-309
Historic landcover dynamics in a scrubby flatwoods (Tel-4) and scrub landscape (Happy Creek) on John F. Kennedy Space Center were measured using aerial images from 1943, 1951, 1958, 1969, 1979, and 1989. Landcover categories were mapped, digitized, geometrically registered, and overlaid in ARC/INFO. Both study sites have been influenced by various land use histories, including periods of range management, fire suppression, and fire management. Several analyses were performed to help understand the effects of past land management on the amount and spatial distribution of landcover within the study sites. A chi-squared analysis showed a significant difference between the frequency of landcover occurrence and management period. Markov chain models were used to project observed changes over a 100-year period; these showed current management practices being effective at Tel-4 (restoring historic landscape structure) and much less effective at Happy Creek. Documenting impacts of past management regimes on landcover has provided important insight into current landscape composition and will provide the basis for improving land management on Kennedy Space Center and elsewhere. 相似文献
15.
AIM: Previous studies performed with XBP-01 in vitro indicated that XBP-01 could inhibit vascular smooth muscle cells from being transformed into foam cell and could eliminate the atherosclerotic plaque in C57BL/6J mouse. This experiment is to investigate its mechanism of eliminating plaques in vitro. METHODS: The cultured porcine artery smooth muscle cells incubated with XBP-01 of 0.1 mg/L for 24 h after preincubated with oxidized low density lipoprotein of 15 mg/L for 72 h in vitro. The samples were analyzed by fluorescence microscope, confocal microscope system and flow cytometry. RESULTS: Apoptosis was triggered by being incubated with oxidized low density lipoprotein and this process was accelerated additionally by being incubated with XBP-01. CONCLUSION: XBP-01 can be effective in eliminating atherosclerotic plaque by accelerating the process in which oxidized low density lipoprotein induced smooth muscle cell apoptosis. 相似文献
16.
Species distribution models (SDMs) often use elevation as a surrogate for temperature or utilise elevation sensitive interpolations
from weather stations. These methods may be unsuitable at the landscape scale, especially where there are sparse weather stations,
dramatic variations in exposure or low elevational ranges. The goal of this study was to determine whether radiation, moisture
or a novel estimate of exposure could improve temperature estimates and SDMs for vegetation on the Illawarra Escarpment, near
Sydney, Australia. Forty temperature sensors were placed on the soil surface of an approximately 12,000 ha study site between
November 2004 and August 2006. Linear regression was used to determine the relationship with environmental factors. Elevation
was correlated more with moderate temperatures (winter maximums, summer minimums, spring and autumn averages) than extreme
temperatures (summer maximums, winter minimums). The correlation (r
2) between temperature and environmental factors was improved by up to 0.38 by incorporating exposure, moisture and radiation
in the regressions. Summer maximums and winter minimums were predominately determined by exposure to the NW and coastal influences
respectively, while exposure to the NE and SW was important during other seasons. These directions correspond with the winds
that are most influential in the study area. The improved temperature estimates were used in Generalised Additive Models for
37 plant species. The deviance explained by most models was increased relative to elevation, especially for moist rainforest
species. It was concluded that improving the accuracy of seasonal temperature estimates could improve our ability to explain
the patchy distribution of many species.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users. 相似文献
17.
AIM: To detect the expression of cytoplasmic inhibitor of apoptosis protein 2 (c-IAP2) and growth arrest-specific gene 1 (GAS1) in Hodgkin's lymphoma (HL) and anaplastic large cell lymphoma (ALCL) and to investigate the role of two genes in the pathogenesis of HL and ALCL.METHODS: HE staining, the antibodies CD30, CD15, CD45RO and CD20 were used to screen the cases of HL and ALCL from 288 cases of lymphoma. The clarified HL and ALCL were subjected for immunohistochemical staining by SP and ABC methods to analyze the expression of c-IAP2 and GAS1. RESULTS: ①The positive rate of c-IAP2 in HL was 25/26(96.1%) while that in ALCL was 6/19(31.6%), there presented statistic significance between HL and ALCL groups(P<0.05), meanwhile the positive rate of GAS1 showed statistic significance between HL and ALCL groups(P<0.05). ②Two cases were showed to be a mixed type combined with large tumor cells of HL and relatively smaller tumor cells of ALCL.CONCLUSION: ①The different expression of c-IAP2 and GAS1 in HL and ALCL implied a different mechanism of oncogenesis and the different defects in the pathway of signal transduction of apoptosis in HL and ALCL;②Few cases showed an overlap and a likely transitional state between HL and ALCL; ③The different expressing manner of GAS1 and c-IAP2 in HL and ALCL implied the potential marks for the differential dignosis of two kinds of lymphoma. 相似文献
18.
Effects of patch attributes, barriers, and distance between patches on the distribution of a rock-dwelling rodent (Lagidium viscacia) 总被引：1，自引：0，他引：1
We tested whether size of habitat patches and distance between patches are sufficient to predict the distribution of the mountain
vizcacha Lagidium viscacia a large, rock-dwelling rodent of the Patagonian steppe Argentina, or whether information on other patch and landscape characteristics
also is required. A logistic regression model including the distance between rock crevices and depth of crevices, distance
between a patch and the nearest occupied patch, and whether or not there was a river separating it from the nearest occupied
patch was a better predictor of patch occupancy by mountain vizcachas than was a model based only on patch size and distance
between patches. Our results indicate that a simple metapopulation analysis based on size of habitat patches and distance
between patches may not provide an accurate representation of regional population dynamics if patches vary in habitat quality
independently of patch size and features in the matrix alter connectivity.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
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β3-adrenergic receptor is the third subtype of β-adrenergic receptors. The genetic structure and pharmacological property of β3-adrenergic receptor are markedly distinguished from β1-and β2-adrenergic receptor subtypes. Recently studies show that myocardial β3-adrenergic receptor mediates negative inotropic effect through Gi-protein/NO/cGMP pathway, the expression of β3-adrenergic receptor and negative inotropic effect mediated by β3-adrenergic receptor are increased in heart failure. However, because of the low expression of β3-adrenergic receptor in the heart, the actual pathophysiological significance of β3-adrenergic receptor remains unknown. 相似文献