Changes in Soybean Raceme and Petiole Anatomy Induced by 6-Benzylaminopurine

An enlargement of the peduncle and rachis of the terminal racemeand the petiole of the uppermost mainstem leaf was observedin soybean plants [Glycine max (L.) Merr.] treated with thecytokinin, 6-benzylaminopurine (BAP). Histological studies wereperformed to determine the timing and extent of anatomical changesaccompanying BAP treatment. Swelling of treated ‘Tracy-M’peduncles, rachises, and petioles was observed within 4–6d after treatment initiation. A significant increase in totalcross-sectional tissue area was observed at lower and intermediateinternodes of treated rachises after 11 d. Rachis enlargementwas due to increases in both cell size and cell number, particularlyof the vascular tissue. In treated petioles of IX93-100, procambialcells of vascular bundles were the first to respond to the BAPtreatment. These cells differentiated into a vascular cambiumwhich formed secondary xylem and phloem. Soybean, Glycine max (L.) Merr., anatomy, rachis, BAP.     

荷花 PIN 基因家族的鉴定及非生物胁迫表达分析

【目的】探究荷花中NnPIN家族成员的特征及在非生物胁迫响应中的作用,为荷花抗逆新品种的选育提供新的基因资源。【方法】采用生物信息学方法对荷花NnPIN家族进行全基因组鉴定,并通过qRT-PCR技术分析了其在低温(4℃)、水淹及外源3 mmol/L脱落酸(ABA)处理下的表达模式。【结果】(1)荷花基因组中共鉴定出12个具跨膜结构域的NnPIN基因,分别命名为NnPIN1～12,且分布在6条染色体上,并主要定位于质膜和内质网;(2)系统进化分析表明,NnPIN蛋白可根据中央亲水环的长度分为经典型和非经典型2种类型,且同一类型具相似结构;经典型具完整的motif 1～12,而非经典型则缺失中央亲水环部分(motif 6,8,9,12);(3)NnPIN基因在启动子区域具有大量光响应、非生物胁迫和激素响应元件,并特异性地具有厌氧、脱落酸(ABA)、低温等响应元件;(4)NnPIN基因(除NnPIN8外)均正向响应外源ABA和低温胁迫,而NnPIN6和NnPIN7正向响应水淹胁迫,NnPIN1、NnPIN2、NnPIN3、NnPIN4、NnPIN5、NnPIN8、NnPIN9和NnPIN12...     

以贵州梵净山国家级自然保护区为模式产地的维管植物物种模式标本研究

在对有关模式标本资料广泛查询的基础上，统计出以梵净山国家级自然保护区为模式产地的维管植物91种(含种下单位)，隶属于47科73属。除1种无采集人信息外，其余90种由31人或团队采集，这些标本保存于国内外21个研究机构。以该地为模式产地的物种中，19种以梵净山命名。原学名中有17个被归并，其中12个学名在种级水平发生了变化，5个学名在种下水平发生了变化。以该地为模式产地的物种中受威胁的共15种，包括极危(CR) 1种，濒危(EN) 6种，易危(VU) 8种。     

PERCEPTION OF FAT IN A MILK MODEL SYSTEM USING MULTIDIMENSIONAL SCALING

This study examined the contributions of stimulus fat content and flavor volatiles to the perception of fat in a milk model system. The model system was formulated by adding bland vegetable oil (0%, 5%, or 10% w/v) and natural cream flavor (0%, 0.5% or 1% w/v) to a skim milk base. Panelists judged pairs of samples for similarity on the basis of three attributes (fat content, mouthcoating and thickness) and the results were analyzed using a multidimensional scaling procedure. Two-dimensional solutions best represented the data. The stimulus spaces for fat content and mouthcoating were visually similar to each other and provided reasonable separation of the samples. Instrumental measures helped to define the underlying dimensions of the stimulus space for fat content. Dimension 1 related to texture and included the contributions of viscosity, and fat particle size and number distribution; dimension 2 related to flavor perception. The sample with a moderate fat content (5%) and the highest concentration of added cream flavor (1%) was perceived to be similar to the 10% fat samples with added flavor. Thus, the added flavor provided the sensation of higher fat content. These data suggest that flavor plays an important role in the preception of fat in dairy foods. A psychophysical model of fat perception in dairy foods is proposed which includes the contribution of viscosity, fat particle size and number distribution, and volatile flavor perceptions.     

益生菌联合口腔洁治对慢性萎缩性胃炎的疗效及安全性评价

目的对益生菌联合口腔洁治治疗慢性萎缩性胃炎的有效性、安全性进行评价。方法选择2015年12月到2018年2月我院收治的102例慢性萎缩性胃炎患者为研究对象,随机分为对照组(n=51)与观察组(n=51)。对照组患者采用益生菌治疗,观察组在对照组基础上予以口腔洁治进行治疗。对两组患者治疗的有效性、安全性进行比较。结果观察组患者总有效率(92.16%)高于对照组(68.63%),差异有统计学意义(χ~2=8.956,P=0.003)。治疗前,两组患者病理和症状评分差异无统计学意义(t=0.226、0.142,P=0.087、0.074)。治疗后,两组患者病理和症状评分均显著降低,且观察组患者病理评分(5.22±1.03)和症状评分(6.46±1.24)均低于对照组的病理评分(7.59±1.22)和症状评分(9.16±1.25),差异有统计学意义(t=10.600、10.951,P0.001)。观察组患者不良反应发生率(3.92%)低于对照组(31.37%),差异有统计学意义(χ~2=13.222,P0.001)。观察组患者无复发,对照组复发率为17.65%,差异有统计学意义(χ~2=9.871,P=0.001)。结论在慢性萎缩性胃炎治疗中应用益生菌联合口腔洁治具有显著效果,安全性较高,值得推广。     

超高产杂交水稻皮秒分辨荧光特性

采用时间分辨荧光光谱测试系统，研究了超高产杂交水稻(Oryza sativa L.)两优培九(P9)和对照汕优63(SH 63)类囊体膜的荧光光谱特性和时间特性。以脉宽为120ps，重复率为4MHz，波长为514nm的Ar^-激光分别激发P9和SH 63水稻类囊体膜荧光。通过对其超快荧光的时间特性和光谱特性比较研究发现：无论是在灌浆期还是在扬花期，P9水稻类囊体膜中光系统I激发能传递的速度比光系统Ⅱ的快；P9和SH 63两种水稻类囊体膜在灌浆期的激发能传递速度都比扬花期的快；两种水稻类囊体膜的光谱特性还给出，在从扬花期到灌浆期这一生长发育过程中，SH63水稻类囊体膜的色素成分和结合状态发生了变化，而P9却没有出现这种变化。