细胞分裂素基因（T—cyt）启动子驱动下的GUS基因在烟草和马铃薯中的表达

构建了来自根癌农杆菌（Ａｇｒｏｂａｃｔｅｒｉｕｍ ｔｕｍ ｅｆａｃｉｅｎｓ） Ｔ－ＤＮＡ 的细胞分裂素基因（Ｔ－ｃｙｔ）启动子驱动下的ＧＵＳ基因的表达质粒,并用以转化烟草（Ｎｉｃｏｔｉａｎａ ｔａｂａｃｕｍ ｃｖ． Ｗ ３８）和马铃薯（Ｓｏｌａｎｕｍ ｔｕｂｅｒｏ－ｓｕｍ Ｌ． ｃｖ． Ｄｅｓｉｒｅｅ）,研究其在转基因植物中表达的定位。结果表明,Ｔ－ｃｙｔ启动子在转基因植株的根、茎、叶、块茎和萌发的种子中均可表达。其中在茎和块茎中的表达是不均一的：在维管束部分表达较强,在侧芽或叶柄的生长点及块茎的芽生长点表达活性较高。此外,在培养基中加入０．１ ｍ ｇ／ＬＢＡＰ,转基因烟草茎中ＧＵＳ基因的表达活性增强,而对ＮＡＡ 没有明显的反应。看来某些外源植物激素对Ｔ－ｃｙｔ启动子的活性有一定的诱导作用     

INTERACTION OF TEMPERATURE AND GIBBERELLIN ON POTATO SEED GERMINATION

Recently harvested true seed of potato frequently requires several months for complete germination. Gibberellic acid (GA₃) has a pronounced effect on seed germination, but this effect is influenced by temperature. As the temperature approaches 80 F, germination decreases considerably irrespective of GA₃ treatment. Potato seed germination is also favored by low temperature, but constant low temperature alone does not insure complete germination of dormant seeds. More than 95% germination of dormant seeds can be obtained within a week either by application of GA₃ at low temperature or by diurnal alternation of temperature. A possible mechanism for control of seed germination is discussed.     

马铃薯内生细菌的分离及其对环腐病菌的拮抗作用检测(简报)

马铃薯是世界四大作物之一,我国是世界上马铃薯种植面积最大的国家,种植面积达6000万亩。近年来,在马铃薯经济良好发展的带动下,马铃薯生产在种植面积和单产水平上有了大幅度提高。然而各种病害随之表现出逐年上升的趋势。环腐病、黑胫病、干腐病是造成北方马铃薯田间和窖存烂薯的主要病害,一般经济损失达20%—30%,严重年份可达50%。马铃薯环腐病害难以防治是因为病菌侵染部     

CHLOROGENIC ACID ACCUMULATION AND WOUND HEALING IN SWEET POTATO ROOTS

Mc Clure , T. T. (Plant Pest Control Division, ARS, USDA, Washington, D. C.) Chlorogenic acid accumulation and wound healing in sweet potato roots . Amer. Jour. Bot. 47(4) : 277—280. Illus. 1960.–Chlorogenic acid accumulation in cells adjacent to a wound occurs before suberization and wound-periderm formation. Suberization during wound healing was highly correlated with chlorogenic acid accumulation and with wound-periderm formation. The possible role of chlorogenic acid as a source of chemical units for suberization is suggested. Histochemical tests indicate that suberization during wound healing may be a form of lignification. Over 5 times as much lignin was found by chemical analysis in the tissues of healed surfaces as in controls.     

影响活体内马铃薯晚疫病菌卵孢子产生因素的研究*

研究了不同菌株组合,马铃薯植株茎、叶及接种物中A1和A2菌株孢子囊比例、温度、湿度对卵孢子产生的影响。不同菌株组合产生卵孢子的数量有显著差异;在离体接种情况下,叶片中产生卵孢子数量大于茎中产生卵孢子数量;A1和A2菌株中孢子囊不同比例对卵孢子产生影响很大,当比值为1∶1时卵孢子产生量最大;15℃光照条件下培养,并给侵染叶片持续的水分供应才能产生大量卵孢子;寄主的抗性水平对卵孢子产生有明显的影响,中抗品种上产生卵孢子量最多,高抗品种上产生卵孢子量最少,感病品种上产生卵孢子量居中。