Study On Biological Characters Of S.lyco. And Cross-compatibility Between S.lyco.and Lycopersicon

Tomato is an important vegetable crop . Nowadays, the diversity of useful resources of tomato is quickly decreased. There is scarcely the antigen about low temperature, low light level, drought, humidity and CMV. Especially the two difficult problems in tomato breedingesistances of CMV and low temperature are not solved until now. The reason is short of useful genetic resourcesSolanum lycopersicoides has many good characters.The purpose of my experiment is solving the following problom: knowing the biological characters; studing on cross-compatibility between S.lyco. and lycopersicon and providing theory basis to utilize S.lyco. to broadengenetic resource. The results are as follows:I.Morphological character of S.lyco.:Seed colour is brown and seed size is in between cultivated and wild tomatos? its stem is much-branched and centrical; Leaves is odd pinnately compound leaves with sawtooth margin; Anthers is white and burst at top with exserted stigma; The fruits colour is green. The diameter is 1.1?.2cm. There are 10?2 brown seeds in fruit.2.Growth and development habits of S.lyco.:Seed doesn germinate at the normal condition and the barrier can be overcome by the treatment of seeds with 50% HOCI; S.lyco. belongs to indeterminated type with rampant, strong growth potential and sprouting; lnflorescerce type is compound raceme; The flower popens at daytime and closes at night; The type of aperture is 3-colporate; The diameter is 1.7 times than lycopersicon. ; S.lyco. is self-sterile, fruit-setting rate is 5?5% by pollinated among plants.3.The best composition of lycopersicon pollen germinating culture medium: the content of sugar, boric acid and agar is respectively 13%, 143mg/kg and 1%.4.Intergenetic crossing between S.Iyco. and L.escu. is incompatible. As S.lyco. is used as female parent, the reason of incompatibity is that pollen tubes can prolong in the style; when s.lyco. is used as male parent, the embryonic development is not normal.5.lntergenetic crossing between S.lyco. and Iycopersicon is incompitable.Graduate:Liu shouweiMajor:vegetab]eSupervisor:Prof.Li jingfu...