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60Co-γ射线辐射对车前草六项生理指标的影响 总被引：6，自引：0，他引：6
本试验探讨了60Co-γ射线不同剂量对车前草六项生理指标的影响.结果表明:可溶性糖与辐射剂量之间存在显著负相关;淀粉、蛋白质、类胡萝卜素含量以20 Gy辐射处理最高;叶绿素(a b)以30 Gy辐射处理最高,20 Gy辐射处理次之;车前草的六项生理指标以20 Gy辐射处理的表现较好. 相似文献
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本文分别以大蕉、香蕉、粉蕉的未成熟雄花为材料,取其幼嫩花序和花序轴薄片作外植体,研究了不同浓度的2,4-D、6-BA、KT、IAA、NAA对其胚性愈伤组织的诱导和增殖的影响及诱导过程的一系列反应。结果表明,前胚性性愈伤的诱导难易程度为:大蕉难于香蕉,粉蕉最难,胚性愈伤组织相似。诱导前胚性愈伤组织适宜的培养基配方,大蕉为:MS 6-BA4.0 2,4-D1.;香蕉为:MS BA6.0 2,4-D2.0;粉蕉的配方和香蕉一样。诱导胚性愈伤组织适宜的培养基配方MA IAA1.0 2,4-D4.0 NAA1.0。增殖适宜的培养基,大蕉为:MS 6-BA3.0 2,4-D0.5。香蕉为:MA IAA1.0 2,4-D4.0 NAA1.0粉蕉的配方和香蕉一样。 相似文献
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Hannington H. Mukasa David Ocan Dirk De Waele Patrick R. Rubaihayo Guy Blomme 《Biology and Fertility of Soils》2006,43(2):229-235
A study to determine the impact of a multispecies nematode population on the root, corm, and shoot growth of East African Musa genotypes was carried out. Eight genotypes comprising the plantain “Gonja” (Musa AAB group), the dessert banana “Sukali Ndizi” (AAB), the beer banana “Kayinja” (ABB), and five East African Highland bananas (AAA-EA) were assessed at flower emergence of the plant crop. Root damage and plant growth characteristics were assessed on both infected and noninfected plants. This study showed that Radopholus
similis and Helicotylenchus
multicinctus were recovered in highest numbers from infected mother plants. Significantly (P<0.05) higher shoot and root damage was observed in the infested plot compared to the noninfested plot. The differences in nematode damage observed among the different Musa genotypes confirm the variability in susceptibility to nematodes. Most of the East African Highland bananas and “Gonja” had a significant reduction in root system size. In addition, toppling and lengthening of the period to flower emergence of the plant crop was much more pronounced in these genotypes. In contrast to previous reports, this study indicated that a multispecies nematode infection significantly (P<0.05) reduced shoot and root growth of “Kayinja”. “Sukali Ndizi”, however, was observed to be tolerant to nematode infection as a small reduction in the root system size was associated with a negligible effect on the corm and shoot growth characteristics. Therefore, the percentage reduction in root and shoot growth due to nematode infection is not constant but depends on the plant genotype. 相似文献
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从表现枯萎病症状的大蕉球茎病组织中获得10株分离物,采用形态学分类方法将这些分离物鉴定为尖孢镰刀菌.利用分离物DJ1的rDNA-ITS区序列和IGS序列开展的系统发育分析迸一步确定DJ1为尖孢镰刀菌.对不同香蕉品系的致病性测定结果表明,DJ1对粉蕉(Musa sp.ABB)的致病性最强,其次是特威(Musa sp.AAA)、巴西蕉(Musa sp.AAA)和泰蕉(Musa sp.AAA),对皇帝蕉(Musa sp.AA)的致病性较弱,根据DJ1的寄主范围确定DJ1为尖孢镰刀菌古巴专化型生理4号小种.对IGS序列的进一步比对分析表明DJ1不属于热带4号生理小种菌株.这些结果为大蕉枯萎病的防治提供了重要依据和指导. 相似文献
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L.?H.?M.?Blommers H.?H.?M.?HelsenEmail author F.?W.?N.?M.?Vaal 《Journal of pest science》2004,77(3):155-163
The rosy apple aphid Dysaphis plantaginea (Passerini) is a key pest in western European apple orchards; the economic damage threshold is so low that outbreaks cannot be forecasted. A mass rearing of the species on plantain (Plantago lanceolata L.) was initiated, with the aim to infest apple trees with either the autumn migrants, gynoparae and males, or the egg-laying females (oviparae). Here, data are presented about the propagation of the species on plantain, on the production of autumn migrants under laboratory conditions, and on the duration of juvenile development and reproductive capacities of both gynoparae and oviparae. Under long-day conditions (18 h light/day) on plantain, the thermal constant for the duration of juvenile development was 166 dd (day-degrees) above the lower development threshold of 5.1 °C, and daily larviposition amounted to 1.87 times the temperature (°C)minus 0.8, above a lower threshold of 4.3 °C. Between 32 and 36 larvae were produced by the young female before the first larvae become adult and their reproduction started to overshadow their mothers. A plant freshly infested with 12 reproducing females and transferred to short-day conditions (12 h light/day) yielded up to 5,000 autumn migrants, with males in the majority. The first gynoparae appeared after about 25 days at both 16 and 20 °C, and males appeared after 40 and 33 days, respectively. Young adult gynoparae produced most of their about ten offspring right after landing on apples, unless temperature was well below 15 °C. The duration of juvenile development of these oviparae appeared to be rather variable and their egg-laying so protracted that each of these females needs to survive several weeks to produce a handful of winter eggs. With reproductive capacities of up to 14 progeny/female for gynoparae and 7.4 for oviparae, release of one gynopara in the field could theoretically lead to the deposition of 100 winter eggs. 相似文献
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