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Ma Si Li Yaxin Li Xin Sui Xiaolei Zhang Zhenxian 《Journal of Plant Growth Regulation》2019,38(2):494-500
Journal of Plant Growth Regulation - Carbohydrate produced by photosynthesis is loaded into phloem via collection phloem, translocated via the transport phloem, and unloaded by release phloem into... 相似文献
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A new cell line from larval fat bodies of the bollworm, Helicoverpa armigera (Lepidoptera: Noctuidae) 总被引:1,自引:0,他引:1
Zhang H Zhang YA Qin Q Wang Y Li X Miao L Yin Z Zhang A Qu L Ding C 《In vitro cellular & developmental biology. Animal》2006,42(10):290-293
Summary A new cell line, designated IOZCAS-Ha-I, was initiated from the fat body of larvae of Helicoverpa armigera (Lepidoptera: Noctuidae) in TNM-FH medium containing 10% fetal bovine serum. Spherical cells were predominant among the various
cell types. The cell line showed a typical lepidopteran chromosome pattern ranging from 58 to 239 chromosomes in the majority
of the cells, it was confirmed to have originated from the H. armigera by the DNA amplification-fingerprinting polymerase chain reaction (DAF-PCR) technique. The new cell line was only slightly
susceptible to the multiple nucleocapsid nuclear polyhedrosis viruses (NPV) from H. armigera. 相似文献
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Shaohui Wang Liping Hu Jianlei Sun Xiaolei Sui Yuxia Wei Zhenxian Zhang 《Plant Growth Regulation》2012,66(1):87-93
Cucumber (Cucumis sativus L.) seeds were pretreated with exogenous abscisic acid (ABA) prior to germination. After germination, seedlings with three
leaves were exposed to gradual dehydration. The effects of ABA on photosynthetic rate (Pn), daily water loss (WL) and water
utilization efficiency (WUE) during dehydration were investigated, in addition to the variation of carbohydrates in leaves.
ABA improved the Pn, WL and WUE of cucumber seedlings during dehydration. After rehydration, the seedlings pretreated with
ABA showed a higher recovery in Pn, WL and WUE, as compared to those without an ABA pretreatment. Subsequent to dehydration,
concentration of stachyose, raffinose, sucrose, glucose, and fructose increased in seedlings pretreated with ABA. Dehydration
altered the proportions of the sugars in the total carbohydrates, and accelerated the accumulation of stachyose, raffinose
and sucrose. After rehydration, carbohydrate concentrations of seedlings pretreated with ABA recovered to levels observed
prior to dehydration. These results demonstrated that pretreatment of seeds with exogenous ABA enhanced carbohydrate tolerance
to dehydration of cucumber seedlings. 相似文献
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不同小麦品种对播娘蒿的影响 总被引:2,自引:0,他引:2
播娘蒿是黄淮麦区主要田间杂草,在管理粗放的麦田,播娘蒿密度可达100株·m-2以上,严重影响了小麦的产量和品质。因此,对小麦-杂草复合体中杂草的生长发育规律进行研究,寻找降低草害的有效途径引起许多学者极大关注[1,2],而目前有关防除麦田杂草的研究多集中于化学防治方面[3]。然而,出于环境保护和经济成本上的考虑,化学除草受到了挑战。研究人员[4,5]发现,不同物种在竞争力上存在差异,禾谷类作物属于竞争力很强的作物[6],冬小麦及冬黑麦又是其中竞争力最强的物种。就小麦栽培种而言,存在着不同的品种类型,研究不同小麦品种对杂草的抑制作… 相似文献
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Inappropriate and excessive irrigation and fertilization have led to the predominant decline of crop yields, and water and fertilizer use efficiency in intensive vegetable production systems in China. For many vegetables, fertigation can be applied daily according to the actual water and nutrient requirement of crops. A greenhouse study was therefore conducted to investigate the effect of daily fertigation on migration of water and salt in soil, and root growth and fruit yield of cucumber. The treatments included conventional interval fertigation, optimal interval fertigation and optimal daily fertigation. Generally, although soil under the treatment optimal interval fertigation received much lower fertilizers than soil under conventional interval fertigation, the treatment optimal interval fertigation did not statistically decrease the economic yield and fruit nutrition quality of cucumber when compare to conventional interval fertigation. In addition, the treatment optimal interval fertigation effectively avoided inorganic nitrogen accumulation in soil and significantly (P<0.05) increased the partial factor productivity of applied nitrogen by 88% and 209% in the early-spring and autumn-winter seasons, respectively, when compared to conventional interval fertigation. Although soils under the treatments optimal interval fertigation and optimal daily fertigation received the same amount of fertilizers, the treatment optimal daily fertigation maintained the relatively stable water, electrical conductivity and mineral nitrogen levels in surface soils, promoted fine root (<1.5 mm diameter) growth of cucumber, and eventually increased cucumber economic yield by 6.2% and 8.3% and partial factor productivity of applied nitrogen by 55% and 75% in the early-spring and autumn-winter seasons, respectively, when compared to the treatment optimal interval fertigation. These results suggested that optimal daily fertigation is a beneficial practice for improving crop yield and the water and fertilizers use efficiency in solar greenhouse. 相似文献
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目的探讨存活素(survivin)反义寡核苷酸(antisense oligodeoxyribonucleotide,ASODN)在人甲状腺髓样癌裸鼠模型中的抑瘤作用。方法构建12只人甲状腺髓样癌裸鼠模型,随机分配到正常组,SODN(sense oligodeoxyribonucleotide,正义寡核苷酸)组和ASODN组,每组4只。各组每日一次瘤内注射相应处理液,连续7d。治疗结束后1周,杀死全部瘤鼠,切取瘤体,测算瘤重和抑瘤率以评价肿瘤生长情况,瘤组织石腊切片分别行HE、免疫组化(IHC)和DNA末端原位标记法(TUNEL法)染色以评价组织病理构造、survivin与VEGF蛋白表达和细胞凋亡的变化。结果HE染色显示ASODN组具有明显减低的血管新生特点。此外,相对于正常组和SODN组,ASODN组具有显著的survivin和VEGF低表达、高凋亡、低瘤重和高抑瘤率特点(各P<0.01),而正常组与SODN组间未见上述各特点的统计学差异。结论本研究证实针对人甲状腺髓样癌survivin基因沉默治疗能够达到明显抑瘤效果,此效果至少部分通过促进肿瘤调亡和抑制肿瘤血管新生而实现。这提示survivin基因在人甲状腺髓样癌中具有重要意义和其可成为人甲状腺髓样癌基因靶向沉默治疗的重要候选基因之一。 相似文献
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