LeJA2基因沉默表达载体导入番茄转化系统的建立

试验设侵染时间、菌液浓度和侵染温度3个因素,利用根癌农杆菌将LeJA2基因按L9（3^4）正交表转化番茄。结果表明,当菌液浓度为OD260=0．6、侵染温度40℃、侵染10min时的转化效果较好,从而建立了较优的LeJA2基因沉默表达载体导入番茄的转化体系,并已得到14株转化再生的番茄植株,经卡那抗性筛选和PCR检测,证明LeJA2-RNAi基因已导入番茄并表达。     

抗TY番茄新品种星宇206的选育

星宇206是以S5为母本、以TS19为父本配制成的中熟番茄杂交一代品种。生长旺盛,坐果率高,丰产性好,果实粉红色、正圆形,平均单果质量230 g左右;色泽鲜艳,口味佳,抗裂果,耐储运;高抗番茄黄化曲叶病毒病(TY),兼抗烟草花叶病毒病、枯萎病、叶霉病、根结线虫病;耐热性强,适宜于南北方早秋、早春日光温室和大棚越夏栽培。     

不同施肥处理对日光温室番茄光合指标及果实品质的影响

通过控制有机肥和化肥的施用量,研究不同的施肥水平对日光温室番茄光合生理及果实品质的影响。结果表明:重施腐熟鸡粪的处理Ⅰ、Ⅱ光合生理的各项指标表现最好,并且在不同的测定时期都表现出相同的规律;其次是处理Ⅲ,处理Ⅳ、Ⅴ(CK)最差,但各个处理之间的差异不明显。随着施肥量的增加,番茄果实中各品质指标有增加趋势,大量且不平衡施肥会降低果实风味品质。     

番茄斑萎病毒TSWV 的鉴定及抗病种质的筛选

 在北京顺义地区番茄栽培温室中随机抽取了15份疑似感染番茄斑萎病毒（TSWV）的植株叶片和果实,利用TSWV试剂盒进行DAS-ELISA检测,结果均为阳性,表明其感染了TSWV。利用来自秘鲁番茄的抗TSWV基因Sw-5的共显性SCAR标记,对442份番茄材料进行分析,筛选出24份含有Sw-5的材料,其中4份为野生番茄,1份为杂交种,16份为高代育种自交系,3份为野生潘那利番茄渐渗系。4份野生番茄综合农艺性状较差,如果实小、产量低、品质和风味差等,不能直接应用于育种;其余20份含Sw-5的材料综合农艺性状较好,可作为番茄抗TSWV的育种材料。     

Evidence of a new Tomato yellow leaf curl virus in Japan and its detection using PCR

A new isolate of Tomato yellow leaf curl virus (TYLCV) has been identified from tomato plants in Kochi Prefecture in Japan and designated TYLCV-[Tosa]. The complete nucleotide sequence of the isolate was determined and found to consist of 2781 nt. In phylogenetic analyses of entire nucleotide sequences, TYLCV-[Tosa] was delineated as a single branch and was more closely related to TYLCV-[Almeria] than TYLCV isolates Ng, Sz, or Ai reported in Japan, which had spread since 1996. Isolate TYLCV-[Tosa] is suggested to be a newly introduced, novel isolate of TYLCV that dispersed into Kochi Prefecture. In addition, a rapid method using the polymerase chain reaction to separate TYLCV isolates into four genetic groups was established. This method would be useful for reliable diagnosis based on genetic differences among isolates of TYLCV.The nucleotide sequence data reported are available in the DDBJ/EMBL/GenBank databases under accession numbers AB192965 and AB192966     

Biomanagement of Fusarium wilt of tomato by the soil application of certain phosphatesolubilizing microorganisms

Abstract

We tested whether a new automated bait dispenser, the Scentinel®, could be programmed to deliver non-toxic bait selectively only to animals of specified dimensions (>400 g body weight and <110 mm body diameter, the size of a ferret or a mink). We tested whether wild ferrets would discriminate between two types of bait (egg/oil and homogenised brain tissue). We set 24 Scentinels in 12 randomised pairs for 11 weeks on a 2400-ha area of pastoral farmland in New Zealand. Of 1559 visits by small animals, 198 were by ferrets (c. 28 individuals). The Scentinels correctly delivered 895 baits to visitors weighing >400 g, and no baits to 543 visitors of <400 g. The mean body weight of live ferrets recorded by Scentinels was not significantly different from that of 34 carcasses collected from the same area by professional trappers. Of the 145 baits dispensed to ferrets, egg/oil bait was significantly more often eaten. We conclude that the Scentinel can reliably deliver bait to specified sizes of animals and deny it to others. It can also facilitate extensive bait preference tests on unrestrained wild pests.     

番茄黄化曲叶病毒在湖北首次报道

2014年春季,在湖北省武汉市发现种植的番茄表现植株矮缩,叶片上卷,叶缘黄化等症状。PCR检测结果显示,所有采集的病样中均存在菜豆金色花叶病毒属病毒。进一步通过滚环扩增方法获得了该病毒的湖北分离物HB01的全基因组。基因克隆及序列分析结果表明,该病毒基因组全长为2 781nt,与已报道的番茄黄化曲叶病毒(TYLCV)各分离物同源性在89.0%以上,而与来自中国不同地区的TYLCV分离物的同源率均在97.0%以上。因此,HB01属于TYLCV的一个分离物。     

侵染新疆加工番茄的中国番茄黄化曲叶病毒 DNA-A的基因组特征

 从新疆加工番茄上分离到病毒分离物XJ26-4,对其基因组DNA-A 全序列测定表明,XJ26-4 DNA-A 全长2 737 个核苷酸(GenBank 登录号:FN985163),具有典型的双生病毒基因组特征。进一步序列比较发现,XJ26-4 DNA-A 与中国番茄黄化曲叶病毒(Tomato yellow leaf curl China virus, TYLCCNV)各分离物的同源性最高,达到91. 2% ~ 99. 5% ,而与其他双生病毒的序列相似性均在79. 5% 以下,表明XJ26-4 是TYLCCNV 的一个分离物。这是首次明确新疆加工番茄受到粉虱传双生病毒的侵染。