Allelic interaction of F1 pollen sterility loci and abnormal chromosome behaviour caused pollen sterility in intersubspecific autotetraploid rice hybrids

The intersubspecific hybrids of autotetraploid rice has many features that increase rice yield, but lower seed set is a major hindrance in its utilization. Pollen sterility is one of the most important factors which cause intersubspecific hybrid sterility. The hybrids with greater variation in seed set were used to study how the F(1) pollen sterile loci (S-a, S-b, and S-c) interact with each other and how abnormal chromosome behaviour and allelic interaction of F(1) sterility loci affect pollen fertility and seed set of intersubspecific autotetraploid rice hybrids. The results showed that interaction between pollen sterility loci have significant effects on the pollen fertility of autotetraploid hybrids, and pollen fertility further decreased with an increase in the allelic interaction of F(1) pollen sterility loci. Abnormal ultra-structure and microtubule distribution patterns during pollen mother cell (PMC) meiosis were found in the hybrids with low pollen fertility in interphase and leptotene, suggesting that the effect-time of pollen sterility loci interaction was very early. There were highly significant differences in the number of quadrivalents and bivalents, and in chromosome configuration among all the hybrids, and quadrivalents decreased with an increase in the seed set of autotetraploid hybrids. Many different kinds of chromosomal abnormalities, such as chromosome straggling, chromosome lagging, asynchrony of chromosome disjunction, and tri-fission were found during the various developmental stages of PMC meiosis. All these abnormalities were significantly higher in sterile hybrids than in fertile hybrids, suggesting that pollen sterility gene interactions tend to increase the chromosomal abnormalities which cause the partial abortion of male gametes and leads to the decline in the seed set of the autotetraploid rice hybrids.

[Clinical study of the treatment of endometriosis with promoting blood circulation and stasis removing method]

The treatment of endometriosis by blood circulation promoting and stasis removing method is based on the experience carried in the "Ji Yin Gang Mu" and the fact that this disease belongs to the category of pelvic stagnant blood. The study group consisted of 53 women with endometriosis. They were manifested as dysmenorrhea, menoxenia, ovarian chocolate cysts and enlarged uterus. The control group consisted of ten women with normal regular menstrual cycle. This article deals with the method of using the hemodynamic index of uterus arterial blood flow. After treatment the blood flow amount of uterus arteries of 53 cases (study group) obviously decreased and their uterus arterial blood flow speed reduced markedly as compared with pretreatment status, (P < 0.001 and P < 0.01) respectively, while pre-treatment group was significantly higher than that of control group (P < 0.001). After medical treatment for 3.5 months, symptoms such as dysmenorrhea and menstrual disorder basically disappeared. 22 ovarian chocloate cysts became smaller and 16 disappeared. The pregnancy rate was 45%. The data of this study suggest that the mechanism of treatment of promoting blood circulation to remove stasis might be closely related to the regulation of physico-chemical characteristics of blood and the adjustment of the function of hemodynamics.