Expressing an (E)-β-farnesene synthase in the chloroplast of tobacco affects the preference of green peach aphid and its parasitoid.

(E)-β-Farnesene (EβF) synthase catalyses the production of EβF, which for many aphids is the main or only component of the alarm pheromone causing the repellence of aphids and also functions as a kairomone for aphids' natural enemies. Many plants possess EβF synthase genes and can release EβF to repel aphids. In order to effectively recruit the plant-derived EβF synthase genes for aphid control, by using chloroplast transit peptide (CTP) of the small subunit of Rubisco (rbcS) from wheat (Triticum aestivum L.

Studies on wheat mutants induced by nitrogen ion beam implantation.

As a new resource of mutagens,low-energy ion beam implantation is characterized as limited physiological damages,wide mutation spectrum, and high mutation frequency in comparison with the mutations from other inducing methods. We treated a wheat doubled haploid line Yi4212 with this technique by nitrogen ion and established a mutant population with 60 lines in our lab. The mutant lines were systematically investigated about their -developmental periods,agronomical performances, gliadin contents and microsatellite variations in M4 generation.

[Studies of the relationship between the breeding efficiency of anther culture and the use of different hybrid generations as anther-donor plants in wheat].

The wheat haploid plantlets from anther culture were of theoretical and applied interest. Induced haploid spirophytes may play a key role, not only in increasing the efficiency of breeding programs by producing pure lines rapidly, but also in the elucidation of fundamental genetics. However large number of experiments turned out that there are many problems with low rate of green plantlet from anther culture, difficulties of saving plantlets though summer, low rate of double chromosome, extrusive contradiction between technique of wheat anther culture and variety improvement.