[Mapping and cloning of GAD1-2 for long awn using CSSLs in rice (Oryza sativa L.)].

Rice is an important food crop in the world. The awn may protect rice seeds from being cut by birds, which is important in rice domestication, survival and diffusion. However, the characteristic of awn is gradually washed out during rice domestication and artificial selection.

[Morphological characteristics and gene mapping of a palea degradation(pd2) mutant in rice].

The yield and quality of rice are directly impacted by floral organ development in rice. Understanding of the floral development mechanism will be useful in genetic improvement of yield and quality. In this study, a rice mutant palea degradation 2 (pd2) in an indica cultivar '8PW33' was obtained after 60Co γ-ray treatment.

[Study of the pH sensitive polymer].

A pH sensitive polymer was prepared by copolymerization of methacrylic acid as monomer, diethylene glycol dimethacrylate as cross-linking reagent, heptane as porogen, and fluorescent dye eosin as indicator. The factors of influence on the preparation, and the character of the pH sensitive polymer for pH were studied. The maximal emission wavelength of eosin was red shifted in the polymer than in solution, the apparent Ka largened, and the dissociation equilibrium of indicator was shifted to acidity direction, because the polarity of polymer diminished.