排序方式: 共有57条查询结果,搜索用时 31 毫秒
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Xi-Shu Gu Wen-Jun Bu Wei-Hong Xu Yi-Chuan Bai Bai-Ming Liu Tong-Xian Liu 《Insect Science》2008,15(3):263-270
We conducted three experiments for management of Bemisia tabaci (Gennadius) biotype ‘B’ on tomatoes under greenhouse conditions: (i) vertically placing yellow sticky cards either parallel or perpendicular to tomato rows at a rate of 1 per 3‐m row; (ii) releasing Eretmocerus sp. nr. rajasthanicus once at 30 adults/m2 in the high whitefly density greenhouses (> 10 adults/plant), or twice at 15 adults/m2 at a 5‐day interval in the low whitefly density greenhouses (< 10 adults/plant); and (iii) using combinations of yellow sticky cards that were placed vertically parallel to tomato rows and parasitoids released once at 30/m2 in high whitefly density greenhouses or twice at 15/m2 at a 5‐day interval in low whitefly density greenhouses. Our data show that yellow sticky cards trapped B. tabaci adults and significantly reduced whitefly populations on tomato. The yellow sticky cards that were placed parallel to tomato rows caught significantly more whitefly adults than those placed perpendicular to tomato rows on every sampling date. In the treatment where parasitoids were released once at 30/m2 in high whitefly density greenhouses, the number of live whitefly nymphs were reduced from 4.6/leaf to 2.9/leaf in 40 days as compared with those on untreated plants on which live whitefly nymphs increased from 4.4/leaf to 8.9/leaf. In the treatment where parasitoids were released twice at 15/m2 in low whitefly density greenhouses, the numbers of live nymphs of B. tabaci on tomato leaves were reduced from 2.1/leaf to 1.7/leaf in 20 days as compared with those on untreated plants on which numbers of live nymphs of B. tabaci increased from 2.2/leaf to 4.5/leaf. In the treatment of yellow sticky cards and parasitoid release once at 30/m2 in high whitefly density greenhouses, the numbers of live nymphs of B. tabaci on tomato leaves were reduced from 7.2/leaf to 1.9/leaf, and in the treatment of yellow sticky cards and parasitoid release twice at 15/m2 at a 5‐day interval at low whitefly density, the numbers of live nymphs of B. tabaci on tomato leaves were reduced from 2.5/leaf to 0.8/leaf; whereas the numbers of live nymphs of B. tabaci on untreated plants increased from 4.4/leaf to 8.9/leaf. An integrated program for management of B. tabaci on greenhouse vegetables by using yellow sticky cards, parasitoids and biorational insecticides is discussed. 相似文献
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The utilization of current nucleic acid technologies in crop improvement and phylogenetic studies require the development
and application of efficient DNA extraction procedures from plants. This paper describes efficient, reliable DNA extraction
procedures forIpomoea andMusa. These procedures are combinations and modifications of the techniques described by Murray and Thompson (1980) and Saghai-Maroof
et al. (1984) and are applicable, without further modification, to other plant genera. 相似文献
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转10kD玉米醇溶蛋白基因甘薯蛋白质及农艺性状分析 总被引:2,自引:1,他引:1
目的:检测转10kD玉米醇溶蛋白基因甘薯蛋白质及农艺性状的变化,初步证明外源目的基因在转基因甘薯中能够表达。方法:以转基因甘薯和非转基因甘薯无菌苗及田间栽培苗为试材,对两者叶片、叶柄、茎、根不同器官醇溶性和水溶性蛋白质含量,以及田间栽培中植株农艺性状的变化作了比较研究。结果:离体培养20d转基因植株根中醇溶性蛋白质含量较对照增加了330.43%,是对照的4.30倍;田间栽培45d转基因植株叶片、茎、根中醇溶性蛋白质含量分别是对照植株的8.38倍、4.60倍、5.19倍,较对照分别高出738.30%、360.26%、418.60%;田间栽培中转基因植株的形态及生长状况分析表明,转基因植株中外源遗传物质的存在对植株生长状况影响不显著。结论:初步证实了转基因甘薯中外源目的基因能够特异表达。 相似文献
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The sweetpotato whitefly, Bemisia tabaci (Gennadius), is a worldwide pest of numerous agricultural and ornamental crops. In addition to directly feeding on plants, it also acts as a vector of plant viruses of cultivated and uncultivated host plant species. Moreover, host plants can affect the population dynamics of whiteflies. An open‐choice screening experiment was conducted with B‐biotype B. tabaci on a diverse collection of crops, weeds, and other indigenous plant species. Five of the plant species were further evaluated in choice or no‐choice tests in the laboratory. The results reveal 49 new reproductive host plant species for B. tabaci. This includes 11 new genera of host plants (Arenaria, Avena, Carduus, Dichondra, Glechoma, Gnaphalium, Molugo, Panicum, Parthenocissus, Trianthema, and Triticum) for this whitefly. All species that served as hosts were acceptable for feeding, oviposition, and development to the adult stage by B. tabaci. The new hosts include three cultivated crops [oats (Avena sativa L.), proso millet (Panicum miliaceum L.), and winter wheat (Triticum aestivum L.)], weeds and other wild species, including 32 Ipomoea species, which are relatives of sweetpotato [I. batatas (L.) Lam.)]. Yellow nutsedge, Cyperus esculentus L., did not serve as a host for B. tabaci in either open‐choice or no‐choice tests. The results presented herein have implications for whitefly ecology and the numerous viruses that B. tabaci spreads to and among cultivated plants. 相似文献
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为了探索适宜的磷肥用量,提高鲜食型甘薯的经济产量和磷肥利用率,以徐薯32为例,于2018—2019年进行两年的田间试验(土壤有效磷含量为31.70 mg·kg-1),比较了不同施磷量对鲜食甘薯产量、品质、磷积累和磷利用效率的影响。试验设置5个施磷水平(P2O5),分别为0(P0)、25(P25)、50(P50)、75(P75)和100 kg·hm-2 (P100)。结果表明: 1)与P0相比,施磷显著提高了鲜薯产量和商品薯产量,以P75处理最高,其次为P50处理,两处理间差异不显著。2)施磷显著提高了薯块中淀粉和还原糖含量,在P50处理下可溶性糖和蛋白质含量显著增加。3)在生育期90~120 d,施磷显著提高了甘薯的磷积累量和干物质积累量。4)磷表观利用率随着施磷量的增加而下降,磷农学效率则随着施磷量的增加先升后降,在P50处理下显著高于其他处理。综合考虑鲜薯产量、品质、经济产量和磷肥利用率,本试验条件下P2O5的适宜用量为50 kg·hm-2。 相似文献
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Tetsuya Masutani Junkichi Iwasa Itsuo Ichimoto Hiroo Ueda 《Bioscience, biotechnology, and biochemistry》2013,77(11):2483-2489
Rhodojaponin-III and 10,14-epoxy-10-deoxy grayanotoxin-III were derived from grayanotoxin-I and -III, respectively. Preparation of 13 new derivatives from α-dihydro grayanotoxin-II was discussed. Some of them showed higher physiological activity than that of natural grayanotoxins. 相似文献