Study on Fertility Characteristic and development on New System of Male sterile lines of Nian Type in Wheat M.A. Postgraduate: Na Niu Tutor: Prof, Gaisheng Zhang Yangling, Shaanxi, 712100) Abstract The Cms is one of the main ways to make use of wheat heterosis In order to probe into utilize characteristics as fertility gene single of it, and to establish a undivided convertible breeding system of it, the principle materials, such as sterile gene carriers different resources, a series of non-IBL/RS male sterile lines of different cytoplasms and identical nucleus carriers and compare fertility characteristic of male sterile lines of Nian type in wheat; 2. to study inheritance on restoring performance of it; 3. to analyze the genetic mechanism of male breeding system of it. The results are as follows. 1. By screening the non-1BL /IRS male sterile cariers of Nian type from different T macha, 90-110, 224 are led into the allocytoplasms with Ae. kotschyi, Ae. variabilis, de ventricosa and Ae. bicornis cytoplasms. The results of mensuration to their fertility restoring performances show as follows: The restoring perfomances of sterile carriers with Tmacha sterile carriers respectively is lower. The range of restoring degree is wider. The C.V. special father or sterile cytoplasms. The restoring performances of Alloplasms 90-110 and and T macha, the difference of average seed set is best significant. So 90-110 and 224 are the lines. They have the vast prospects for making use of! 2. The fertility restoring performance of the 4 male sterile lines of alloplasmic non-1BLIRS wheat with Aegilops kotschy, Ae waribili, Ae ventricosa and Ae bicornisStudy on Fertility Characteristic and Development on New System of Male Sterile Lines of Nian竹pe in Wheat MA. Postgraduate: Na Niu Tutor: Prof. Gaisheng Zhang (Northwest Sci.&Tech. University of Agriculture and Forestry, Yangting, Shaanxi, 712100) Abstract TheCMS is one of the main ways to make use of wheat heterosis . In order to probe into and open out the fertility characteristics of male sterile lines of Nian type in wheat deeply, to utilize characteristics as fertility gene single of it, and to establish a undivided convertible breeding system of it, the principle materials, such as sterile gene carriers diferent resources, a series of non-IBLYIRS male sterile lines of diferent cytoplasms and identical nucleus, identical cytoplasms and diversified nucleus and diferent cytoplasms and nucleus, are utilized, and four contents are studied in this research: 1. to screen the diferent fertility gene carriers and compare fertility characteristic of male sterile lines of Nian type in wheat; 2. to study inheritance on restoring performance of it; 3. to analyze the genetic mechanism of male and female gametes transferring in sterile lines and Ft; 4. to establish the fast convertible breeding system of it. The results are as follows. 1. By screening the non-IBL/I RS male sterile carriers of Nian type from diferent resources in wheat and combining with cytology identification, we can find that SP4, Tmacha, 90-110, 224 are belong to the types of non- I BL/IRS male sterility. They manifest complete male sterility, and the sterility are very stable. After non- IBL/IRS male sterile carriers SP4, Tmacha, 90-110, 224， led into the allocytoplasms with Ae.kotschyi, Ae.variabilis, Ae.ventricosa and Ae.bicornis cytoplasms. The results of mensuration to their fertility restoring performances show as follows: The restoring performances of sterile carriers with Ae.kotschyi and Ae. ventricosa are quite diferent. The restoring degree of Alloplasms SP4 and T.macha sterile carriers respectively is lower. The range of restoring degree is wider. The C. V is higher, and F, plants of these two sterile types appear sterility separation in genotype of special father or sterile cytoplasms. The restoring performances of Alloplasms 90-110 and 224 are fine. They don 't appear sterility separation. The C.V is lower. Compared with SP4 and T macha，the diference of average seed set is best significant. So 90-110 and 224 are the fine resources of maintaining lines. They have the vast prospects for making use of heterosis in wheat. 2. The fertility restoring performance of the 4 male sterile lines of alloplasmic non-IBLIIRS wheat with Aegilops koisc句4 Ae.varibifs, Ae, ventricosa and Ae. bicornis