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Among collections chiefly from North China,different races of Pucciniaglumarum were identified by means of differential hosts used by Gassner & Straibor a set of improved varieties of wheat grown in China. Among 14 improved varieties,marked differences in resistance to stripe rustwere observed.Li-Yung I was resistant to 40 out of 50 collections of striperust,with unstable reactions to 7 collections; Nanking 4197 was resistant to 37 ??collections with unstable reactions to 9 collections; while Yechao 35368...

Among collections chiefly from North China,different races of Pucciniaglumarum were identified by means of differential hosts used by Gassner & Straibor a set of improved varieties of wheat grown in China. Among 14 improved varieties,marked differences in resistance to stripe rustwere observed.Li-Yung I was resistant to 40 out of 50 collections of striperust,with unstable reactions to 7 collections; Nanking 4197 was resistant to 37 ??collections with unstable reactions to 9 collections; while Yechao 35368 and Ye-Ta 1885 were susceptible to all except 5 collections from FJymus ckinense.Theinstability of varietal reactions is one of the principal obstacles in identification.As a consequence,tests with 6 improved varieties including Early Premium,Pi-Ma 1,etc.,only 21 out of 50 stripe rust collections could be differentiated into10 distinctly different races (Y 1 to Y10).However,there were great differencesin pathogenicity among different races so far identified.All the 6 improvedvarieties were resistant to race Y 1 and susceptible to race Y 2.The virulenceof other races differed from one another also pronouncedly. Races Y2,Y3,Y4,Y5 ,Y6,Y7 ,and Y8 were collected from wheat; Y 9 andY10 from Agropyron spp.; and Y1 was collected mainly from Elymus chinense(including 1 collection from wheat).Races Y 1,Y 3.Y 4,Y 5,Y 7,Y 8,Y 9,Y 10were found in Hopeh; Y 1,Y 2,Y 6,Y 7 in Shansi; and Y 6 in Shantung. All collections could be readily grouped into 16 different forms if the highestreaction type was taken as a basis for identification (this method of groupingwas adopted by Fang et al).Comparing the results with that of Fang et al,itappeared that reactions of certain varieties,such as Early Premium,Li-Yung 1 tocollections from North China were distinctly different from their reactions tocollections from East China.This suggested strongly that races of stripe rustorganism between these two regions might be quite different. All wheat varieties tested were found to be resistant to stripe rust collectionsfrom Elymus chinense.whereas collections from Elymus sibiricus and Agropyronspp.were capable of attacking many wheat varieties. Single spore infection of stripe rust frequently resulted in sporulation on thewhole leaf blade.This is definitely much more systemic than infections of eitherstem rust or leaf rust organism.Inoculations with single uredospores and mono-uredospore lines often produced mixtures of infection types ranging from resistantto susceptible on same leaf blades.This is analogous to "X" type reactions re-ported in stem rust and leaf rust literature; therefore,"X" type reaction shouldalso be recognized in the study of stripe rust.

1950年以来自华北以及少数其他地区搜集的条銹菌种,不論在Gassner和Straib所用的鑒定寄主或在国內推广品种上鑒定,都可区分出許多不同的类型。所用14个推广品种对于这些条绣菌种的抗病性有着很大的差別;其中以驪英1号最抗病,对50个菌种中的40个菌种是抵抗的,对7个菌种反应不稳定;金大4197次之,对37个菌种是抵抗的,9个菌种反映不稳定;燕交35368及燕大1885除了对5个碱草(Elymus chin-ense)条銹菌种抵抗外,对其他所有菌种的反应都是感染型。品种反应的不稳定,是鑒定工作中的主要困难。加根据早洋麦、农大3号、碧螞1号、碧螞4号、驪英3号、玉皮麦等6个品种的稳定反应加以分析,仅能將50个菌种中的21个区分成10个显著不同的类型。这6个品种对第一类型均为抵抗,对第二类型均为感染,其他类型的致病力介于二者之間。在这10个类型中,类型Y_2,Y_3,Y_4,Y_5,Y_6,Y_7,Y_8采自小麦;类型Y_9,Y_(10)采自Agropyron spp.;类型Y_1主要采自Elymuschinense(包括一个小麦菌种)。河北出現的类型有Y_1,Y_3,Y_4,Y_5,Y_7,Y_8,Y_9,...

1950年以来自华北以及少数其他地区搜集的条銹菌种,不論在Gassner和Straib所用的鑒定寄主或在国內推广品种上鑒定,都可区分出許多不同的类型。所用14个推广品种对于这些条绣菌种的抗病性有着很大的差別;其中以驪英1号最抗病,对50个菌种中的40个菌种是抵抗的,对7个菌种反应不稳定;金大4197次之,对37个菌种是抵抗的,9个菌种反映不稳定;燕交35368及燕大1885除了对5个碱草(Elymus chin-ense)条銹菌种抵抗外,对其他所有菌种的反应都是感染型。品种反应的不稳定,是鑒定工作中的主要困难。加根据早洋麦、农大3号、碧螞1号、碧螞4号、驪英3号、玉皮麦等6个品种的稳定反应加以分析,仅能將50个菌种中的21个区分成10个显著不同的类型。这6个品种对第一类型均为抵抗,对第二类型均为感染,其他类型的致病力介于二者之間。在这10个类型中,类型Y_2,Y_3,Y_4,Y_5,Y_6,Y_7,Y_8采自小麦;类型Y_9,Y_(10)采自Agropyron spp.;类型Y_1主要采自Elymuschinense(包括一个小麦菌种)。河北出現的类型有Y_1,Y_3,Y_4,Y_5,Y_7,Y_8,Y_9,Y_(10);山西出現有类型Y_1,Y_2,Y_6,Y_7;山东出現有类型Y_6。品种不稳定反应除通过选擇反应較为稳定的品种来克服外,同时还須严格掌握温室条件。如以品种的最高反应为标准(如方中达、陈迺用所采用),則可將上面50个菌种分成16个不同的类型。与华东的結果比較,許多品种如早洋麦、驪英1号等对兩个地区条銹病菌的反应适相反,表明华东和华北条锈菌的致病力可能有很大的差別。Elymus chinense的条銹菌与小麦条绣菌的致病力有極大差异,所测定的小麦品种对前者均抵抗。Elymus sibiricus和Agropyron spp.的条绣菌則能正常侵染多种小麦品种的幼苗。条銹菌在小麦叶片內能适当的扩展,較秆銹菌和叶銹菌更有系統性,單孢子接种約在二星期左右可蔓延到整个叶片。同一叶片上常出現抗病和感病的反应,用單孢及單孢菌系接种,得出同样結果。条绣菌的鑒定标准中除了原有的反应型外,还应加入混合型“X”一項。

A second-approximation solution for the pressure distribution between two elastic bodies in contact is presented. In addition to the terms used by Hertz as the description of a general surface of contact, the present theory will contain the next higher-order terms of its Taylor's series expansion, such that the coefficients of the Hertz second power terms as well as the dominant fourth-power term is satisfied. Hence, the second order effect is a correction to Hertz theory which increases both with the increase...

A second-approximation solution for the pressure distribution between two elastic bodies in contact is presented. In addition to the terms used by Hertz as the description of a general surface of contact, the present theory will contain the next higher-order terms of its Taylor's series expansion, such that the coefficients of the Hertz second power terms as well as the dominant fourth-power term is satisfied. Hence, the second order effect is a correction to Hertz theory which increases both with the increase of normal load and with the increase of eccentricity of the contact. ellipse. method of change of variables is adopted in the process of integration. The solution, thus obtained, agrees exactly with that obtained by Cattaneo when reduced to his special case of two solids of revolution in contact.To illustrate the usefulness of the present theory, the problem of contact between a ball and the outer race of a ball bearing is studied. Curves are plotted to show that the relative magnitude of the second order effect varies with the shape ratio of the contact ellipse at various normal loads.

本文中提供了關於彈性接觸體間壓力分佈的一個二次近似解。解中的高次量效應是對赫芝理論的一個改進;它的影響隨着外力或接觸椭圓面偏心率的增加而顯得更重要。因此這個解在某些實際應用上如滚珠軸承中滾珠与珠槽間的接觸問題,是较需要的。同時當接觸體均為迴轉體這一特殊情况下、本文解答就同凱泰尼奥之解,完全一致。

Considerable difficulties caused by unstable reactions of wheat varieties were encountered by the authors in the study of physiologic specialization of Puccinia glumarum. The fluctuation of varietal reactions was chiefly due to the variation of light and temperature in ordinary green house. It was found that strict control of temperature (constantly at 15℃) and a stable light source were necessary. Fluorescent lamps serves as a good source of cool light, and a daily supply of 16-hours illumination with an intensity...

Considerable difficulties caused by unstable reactions of wheat varieties were encountered by the authors in the study of physiologic specialization of Puccinia glumarum. The fluctuation of varietal reactions was chiefly due to the variation of light and temperature in ordinary green house. It was found that strict control of temperature (constantly at 15℃) and a stable light source were necessary. Fluorescent lamps serves as a good source of cool light, and a daily supply of 16-hours illumination with an intensity of 4,000 Lux is sufficient for normal development of infection-types. Temperature plays most important role among the environmental factors causing the variability of varietal reactions of wheat to stripe rust. In general, wheat varieties become more resistant to stripe rust as the temperature raises from 10℃ upward. The critical temperature at which host reactions changed from susceptible to resistant varied with different combinations of wheat varieties and races of P. glumarum. Eight variety-race combinations out of 60 had their infection types changed from susceptible to resistant at 15℃, 15 combinations changed at 20℃, 18 combinations at 25℃, while 16 combinations had their resistant infection types unchanged under different temperatures. Highly resistant wheat varieties such as Early Premium, Li-Yung 1, Naking 4179 remained resistant to all 4 races tested under a wide range of light intensities, while highly susceptible variety Ycnta 1885 remained susceptible throughout. Other susceptable varieties behaved rather specifically as light intensity and daily length of illumination varied. Infection type, amount of sporulation and range of cnvironmental conditions for sporulation should all be considered as criteria for the exact evaluation of varietal resistance of wheat and pathogenicity of rust races. Race Y6B isolated from wheat vareity Pima-1, has been proved to be a dangerous race, causing Pima strains severely diseased at 10°—20℃, with the capability to sporulate at 25℃. Race Y6, of which the pathogenicity resembled that of race Y6B on 6 differential hosts, had been(?)olated from Shantung and Shansi provinces during 1954—55. These findings correlated well with the breakdown of Pima 1 in resistance to stripe rust over a wide geographic area since 1955. Early Premium, Naking 4197, Liyung 1 and Nungta 6 are highly resistant varieties to race Y6B.

試驗証明温度和光对小麦品种抗条銹病性的影响极大。由于小麦品种对条銹菌不稳定反应所造成生理鑑定小种的困难,基本上可通过严格控制温度和光获得解决。条锈菌生理小种的鑑定最好在15℃恆温和恆光的設备下进行。用日光灯为光源,光強度保持4,000 Lux,每日照射16小时即已足够使小麦品种正常发病。当温度逐漸提高时小麦品种漸由感染变为抵抗。由感染型变为抵抗型的温度轉变点因品种和生理小种的不同組合而有差异,在60个品种小种組合中,自15℃起变为抵抗型的有8个組合,自20℃起变为抵抗型的有15个組合,在25℃下变为抵抗型的有18个組合,在10—25℃温度范围內均为抵抗型的有16个組合。高度抗病的品种如早洋麦、金大4197、驪英一号等在所有光強度(日光40.000 Lux及鎢絲灯与日光灯組成人工光強度为8,000 Lux、6,500 Lux、5,000 Lux、2,500 Lux和1,200Lux.)及各种不同光照时間下(日光灯为光源,4,000 Lux,不同光照时間每日为8、12、16及24小时)均抗病。高度感病品种燕大1885則在所有光強度及各种不同光照时間下均为感染型。孢子产生的数量則随光強度和光照时間的增加而增多。其他...

試驗証明温度和光对小麦品种抗条銹病性的影响极大。由于小麦品种对条銹菌不稳定反应所造成生理鑑定小种的困难,基本上可通过严格控制温度和光获得解决。条锈菌生理小种的鑑定最好在15℃恆温和恆光的設备下进行。用日光灯为光源,光強度保持4,000 Lux,每日照射16小时即已足够使小麦品种正常发病。当温度逐漸提高时小麦品种漸由感染变为抵抗。由感染型变为抵抗型的温度轉变点因品种和生理小种的不同組合而有差异,在60个品种小种組合中,自15℃起变为抵抗型的有8个組合,自20℃起变为抵抗型的有15个組合,在25℃下变为抵抗型的有18个組合,在10—25℃温度范围內均为抵抗型的有16个組合。高度抗病的品种如早洋麦、金大4197、驪英一号等在所有光強度(日光40.000 Lux及鎢絲灯与日光灯組成人工光強度为8,000 Lux、6,500 Lux、5,000 Lux、2,500 Lux和1,200Lux.)及各种不同光照时間下(日光灯为光源,4,000 Lux,不同光照时間每日为8、12、16及24小时)均抗病。高度感病品种燕大1885則在所有光強度及各种不同光照时間下均为感染型。孢子产生的数量則随光強度和光照时間的增加而增多。其他感病品种对光的变动反应較为复杂。衡量小麦品种抗病性和不同小种致病力应同时考虑反应型、孢子堆数量和产生孢子堆的环境条件范围。采自碧螞一号的小种Y_(δB)証明是极为危险的生理小种,由于它在較大温度变差的范围內(10℃—20℃)使碧螞系統的小麦严重感病,并在25℃下仍能产生孢子堆。类似Y_(δB)的生理小种Y_δ过去曾在山东和山西采集的条銹菌标样中发現过,这一事实和碧螞一号在愈来愈广泛的区域內丧失抗銹性的現象是符合的。早洋麦、金大4197、驪英一号及农大6号是对Y_(δB)小种高度抵抗的品种。

 
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