Increased Endogenous Methyl Jasmonate Altered Leaf and Root Development in Transgenic Soybean Plants

Methyl jasmonate （MeJA） is a plant-signaling molecule that regulates plant morphogenesis and expression of plant defense genes. To determine the role of the endogenous MeJA levels in the development of plants, transgenic soybean [Glycine max （L.） Merrill] plants harboring NTR1 gene encoding for jasmonic acid carboxyl methyltransferase （JMT） were produced. The activation of NTR1 gene expression resulted in the production of MeJA. Overexpression of the NTR1 cDNA under the regulation of cauliflower mosaic virus （CaMV） 35S promoter in the transgenic soybean plants was confirmed using Northern blot analysis. The significant differences in leaf and root growth patterns were observed between the transgenic plants and the wild-type plants. The leaves of the transgenic plants were slightly elongated in length but dramatically narrowed in width compared with the nontrans-formed wild-type plants. In addition, elongation of primary root was inhibited in the overexpressed transgenic soybean plantlets, whereas the development of lateral root was stimulated relative to the nontransformed plants. The leaves of the transgenic plants showed 2-2.5-fold higher levels of MeJA than the control plants. These results indicated that the increased endogenous levels of MeJA is involved in regulation of morphogenesis in soybean plants.

猪瘟的克星——根瘟灵

湖北省天门市根瘟灵研究所的廖斌发研究员,根据生产上猪瘟大量发生的实际需要,研制成功了根瘟灵注射液和水肿解救散注射液(急性水肿病特异疗法),用于治疗猪瘟、疑似猪瘟、猪溶血性链球菌病和水肿病,收到明显的效果。已在全国25个省(市自治区)应用10年,治愈25万余只病猪。

苹果黄蚜的防治

苹果黄蚜又称苹果蚜,俗名腻虫。在冬季干旱年份易大量发生。主要吸食汁液,危害苹果树的新叶、嫩梢,被害叶片常显淡黄色并向叶背横卷。一年发生10余代,以卵在枝梢的芽旁或粗皮裂缝内越冬。翌年4月开始孵化,6—7月为繁殖高峰,大量的胎生雌蚜向周围寄主转移,是危害最为严重的时期。防治措施是:

魔芋软腐病防治有新法

近几年来,随着魔芋种植面积的扩大,魔芋软腐病也随之大量发生,其危害程度日趋严重。1992午,四川省仪陇县农业技术推广站的科技人员,针对魔芋软腐病进行了专题研究。通过试验和示范,总结出了一套防治魔芋软腐病的新方法,现总结如下:

飞机超低量喷雾防治落叶松毛虫

落叶松毛虫是落叶松的大害虫。发生猖獗时,会把叶子全部吃光,造成很大的经济损失。1991年大兴安岭十八站林业局天然落叶松林内大量发生落叶松毛虫。有虫面积大约达到80万顷(严重危害7万公顷,中等危害33万公顷,轻度危害40万公顷),受害株率达100％。由于发生面积大,山势平缓,采用飞机超低量喷雾防治。

梦里乾坤——读傅正谷著《中国梦文化》

梦,是任何人都经常、大量发生过的现象,梦的飘忽不定、短暂虚幻、模糊无序都说明了它是“没有结果的思想,没有答案的数学,没有作品的艺术,没有物质的建筑”(茨威格语),从而具有了荒诞神秘的美。从原始社会的人那里,就对梦的发生感到困惑,他们从万物有灵论的观念出发,认为梦是灵魂出没的场所,从而构成了原始宗教的一个重要内容。随着人类的发展,人们关于梦有了多种多样的解释,或视为神谕,或视为托兆,或视为预言。